JP7121333B2 - cordless telephone equipment - Google Patents

Description

The present invention relates to a cordless telephone device in which a base unit and a cordless unit are connected by radio. The present invention relates to a cordless telephone device that connects a master unit and a slave unit using a TDD (Time Division Duplex) wireless communication system.

According to the DECT standard, which is a standard for cordless telephone equipment, one frame in one channel of encoded data consists of 24 slots, as shown in FIG. 8(A). The 12 slots S0 to S11 of the first half frame are used for downlink from the parent device to the child device, and the 12 slots S12 to S23 of the second half frame are used for the downlink from the child device to the parent device. Used for uplink. As shown in FIG. 8B, each slot consists of a 64-bit A field (first field) for transmitting control signals (control data) and a 320-bit B field for transmitting audio signals (audio data). It has a configuration in which a field (second field) and the like are provided.

In a business phone system configured by connecting a plurality of telephone terminals to a main unit, a large amount of control signals are generated. be. In the case of a cordless telephone device, it is also necessary to transmit and receive control signals between the base unit and the slave unit. However, as described above, for example, in the case of the DECT standard communication system, the A field for transmitting control signals is much smaller than the B field for transmitting voice signals. Therefore, a large amount of control signals are transmitted and received using the A field with a small area, and there is a possibility that necessary control signals cannot be transmitted at appropriate timing. In such a case, it is feared that the display on the LCD (Liquid Crystal Display) may be delayed, or the incoming call notification may be delayed.

In order to solve such a problem, in Patent Document 1 described later, it is determined whether or not a call is in progress (whether the call line is being seized or released), and if it is being seized, the A field is used as the control signal. The invention is described in which the B field is used to transmit the control signal if the B field is open. Therefore, transmission of control signals during release can be performed without delay. Further, Patent Document 2, which will be described later, discloses an invention for transmitting a control signal by using an empty slot of another cordless telephone device when there is no other cordless telephone device in the vicinity. Have been described. To transmit a control signal without delay when a radio band is available.

JP 2015-177239 A JP 2017-11545 A

However, in the case of the invention described in Patent Document 1, the control signal is transmitted using the A field during a call as in the conventional case. Therefore, it is not possible to increase the amount of control signal transmission during a call. In addition, in the case of the invention described in Patent Document 2, when a call is being made using a plurality of cordless telephone devices in the wireless band, other available slots cannot be used. , it takes time to transmit the control signal.

In view of the above, the present invention has no empty slots in the radio band, and can effectively utilize the field used in the call even during the call, so that the control signal can be transmitted between the master unit and the slave unit. To provide a cordless telephone device capable of transmission without delay between

In order to solve the above problems, the cordless telephone device of the invention according to claim 1 is:
A first field for control signal transmission and a second field for voice signal transmission having a data length longer than that of the first field are provided between the master and the slave. A cordless telephone device that transmits signals in units of transmission and uses a TDMA (Time Division Multiple Access) / TDD (Time Division Duplex) wireless communication system,
The parent device
In the call capture state, the audio signal to be transmitted to the other party of the call and the audio signal to be received from the other party of the call are subjected to a predetermined detection process, and the voice signal as the voice of the call. a first parent device side determination means for determining whether or not it is necessary to transmit
master unit control means for grasping the operation state of the own unit including the state of whether the operation unit is being operated and whether the own unit is on hold when the own unit has an operation unit, and controlling each unit;
In the call capture state, the operating state of the own device ascertained by the master device control means, in the case where the own device has an operation unit, whether or not the operation unit is being operated, and whether the own device is on hold. a second master unit side determination means for determining whether or not it is necessary to transmit a voice signal as a call voice based on the state ;
When it is determined by the first base unit side determining means or the second base unit side determining means that it is not necessary to transmit the voice signal as the call voice, the second field is used. a parent device side inserting means for inserting a control signal to be transmitted to the child device into a corresponding section of the audio signal to be transmitted to the child device,
The child device is
child device side extracting means for extracting and making available the control signal inserted in the audio signal from the parent device;
slave unit side substitution means for substituting a predetermined signal, which is not inconvenient even if reproduced as an audio signal, for the control signal in the section in which the control signal is inserted in the audio signal from the master unit;
characterized by comprising

According to the present invention, there is provided a cordless telephone device capable of effectively utilizing the field used in a call and transmitting a control signal without delay between a master unit and a slave unit even during a call. realizable.

1 is a block diagram showing an example of the overall configuration of a telephone system according to an embodiment; FIG. 3 is a block diagram showing a configuration example of a parent device; FIG. FIG. 2 is a diagram for explaining a sample audio signal in which a section of low importance exists, and an audio signal in which a control signal is inserted in the section of low importance; FIG. 4 is a diagram for explaining an example of a control signal inserted into an audio signal; FIG. It is a block diagram which shows the structural example of a child device. FIG. 10 is a sequence diagram for explaining processing when an audio signal is transmitted from a child device to a parent device; FIG. 10 is a sequence diagram for explaining processing when an audio signal is transmitted from the parent device to the child device; FIG. 2 is a diagram for explaining the structure of frames and slots of the DECT standard;

An embodiment of the cordless telephone device of the present invention will be described below with reference to the drawings. In the embodiments described below, the case where the cordless telephone apparatus of the present invention is used in, for example, a telephone system called a business phone system formed in an office of a company will be described as an example.

[Telephone system configuration example]
FIG. 1 is a block diagram showing an example of the overall configuration of a telephone system 10 of this embodiment. In a telephone system 10, a plurality of cordless telephone devices 21, 22, . Note that the letter n as a subscript basically means an integer of 1 or more. However, since the cordless telephone devices 21 and 22 already exist in FIG. 1, the letter n in FIG. 1 means an integer of 3 or more. Hereinafter, in this specification, the letter n as a suffix is used with the same meaning.

Each of the cordless telephone devices 21 to 2n comprises a base set BS1, BS2, . Each of the devices BS1 to BSn and each of the slave devices HS1 to HSn are wirelessly connected.

Although it is possible to wirelessly connect a plurality of slave units to each of the master units BS1 to BSn, in this example, one slave unit is connected to one master unit. It is configured to Although not shown, the extension telephones connected to the main unit 1 are not limited to the cordless telephones 21, 22, . It is also possible to connect

In this embodiment, the radio connection between each of the base units BS1 to BSn of the cordless telephone devices 21 to 2n and each of the slave units HS1 to HSn conforms to the DECT standard (method) of the digital cordless telephone described above. It is performed by the TDMA/TDD system used.

The main unit 1 can accommodate one or more telephone lines L1 to Lm (m is an integer equal to or greater than 1). Base units BS1 to BSn of cordless telephone devices 21 to 2n are connected to main unit 1, respectively. In the example of FIG. 1, base units BS1 to BSn and main unit 1 are connected by wire, but they may be connected wirelessly.

The main unit 1 performs call control and line switching control for a plurality of cordless telephone devices 21 to 2n and other controls as a business phone, and supplies a reference synchronization signal SYNC to each of the plurality of cordless telephone devices 21 to 2n. It has functionality. In this example, the reference synchronization signal SYNC is a signal with a period of 130 milliseconds (ms).

Each of the base stations BS1 to BSn of the cordless telephone devices 21 to 2n synchronizes with the reference synchronization signal SYNC from the main device 1, and synchronizes with the DECT standard digital cordless telephone unit communication period of 1 frame (10 milliseconds (ms)). )), and based on the generated frame synchronization signal, TDMA/TDD wireless communication using the DECT standard is performed with the slave units HS1 to HSn. . Therefore, all of the plurality of cordless telephone devices 21-2n operate in synchronization with the reference synchronization signal SYNC from the main device 1. FIG.

As shown in FIG. 1, each of the cordless telephone devices 21 to 2n is a telephone terminal connected to the main device 1 to constitute a business phone system. For this reason, call control signals such as incoming call notifications and call origination requests and other control signals are sent and received to and from the main device 1 . Other control signals include, for example, the LCDs and LEDs (Light Emitting Diodes) of the cordless telephones 21 to 2n for notifying the user of the operating states of other cordless telephones connected to the main unit 1. There are control signals for controlling.

In some cordless telephones, the base unit has a user interface such as a ringer, LCD, LED, and operation unit. However, there are cases where the parent device only implements the function of connecting between the main device and the child device, and the child device has a user interface such as a ringer, an LCD, an LED, and an operation unit. In this case, various control signals are transmitted and received between the parent device and the child device. In this embodiment as well, the base units BS1-BSn of the cordless telephone units 21-2n basically do not have a user interface, and realize the function of connecting between the main unit 1 and the slave units HS1-HSn. is.

Therefore, various control signals are frequently transmitted and received between the masters BS1-BSn and the corresponding slaves HS1-HSn. For this reason, even if the call line is seized and a call is possible, between the base units BS1 to BSn and the handset units HS1 to HSn, the audio signal transmitted through the B field of the frame is not important. A control signal is inserted and transmitted in a section in which it can be determined that is low. As a result, the control signal can be transmitted and received without delay.

In other words, in a telephone call, both speakers rarely speak at the same time, and both speakers alternate between speaking and listening. For this reason, on the side of the listener, the audio signal (sending signal) from the side of the listener decreases and becomes less important. signal) is less important. In this way, in transmission data/reception data whose importance has decreased, various control signals are inserted and transmitted in sections where it can be determined that there is no particular need for transmission. As a result, a large amount of generated control signals can be transmitted between the parent device and the child device without delay even when the communication line is seized and communication is possible.

When it can be determined that the audio signal to be transmitted is of low importance and need not be transmitted, for example, the following cases (1) to (7) are conceivable.
(1) When voice signals above a certain volume level are not continuously detected (2) When the silence detection area continues above a certain size (3) One packet of voice sent by RTP (Real Time Transport Protocol) When the signal is silent (4) When the voice signal to be transmitted matches the white noise data. In the case (6) on hold/ on hold (7) in the unused side during half-duplex communication (echo suppressor operating, etc.), it can be determined that the voice signal is of low importance.

If the amplitude of the audio signal to be transmitted does not continuously reach a certain level, it is not speech, For example, since it is a background sound, it means that it can be determined that the importance is low. In addition, in the case of "when the silence detection area continues for a certain size or more" shown in (2), if the audio signal after sampling has a certain size (a certain interval) of silence in the time direction, the audio signal to be transmitted is Since it does not exist, it means that it can be determined that the importance is low. Here, the term "silence" does not mean that there is no sound (in the narrow sense), but that the output level of the audio signal is below a certain level and the presence of audio that can be recognized by human hearing. It means a state of no sound (broadly defined silence).

In addition, in the case where "one packet of audio signal transmitted by RTP (Real Time Transport Protocol) is silent" shown in (3), the audio signal to be transmitted is viewed in binary, and the signal If the level is below a certain level, it means that the importance can be determined to be low. In addition, in the case where "the audio signal to be transmitted matches the white noise data" shown in (4), although some audio signal above a certain level exists, the audio signal contains all frequency components equally, so-called white noise data. It means the case where it can be regarded as noise. If the audio signal to be transmitted is white noise, it can be identified that the audio signal is of low importance.

In addition, in the case of "when the slave unit detects that the slave unit is being operated for purposes other than calling, such as during menu operations" shown in (5), during the slave unit operation, the transmission data is basically It means that it does not exist and is meaningless because the received voice data cannot be heard. Also in this case, it can be determined that the importance of the audio signal to be transmitted is low. In this embodiment, the base units BS1 to BSn do not have an operation unit, but in the case of a base unit having an operation unit, the same determination can be made in the base unit as well.

In addition, in the case of "on hold/on hold" shown in (6), although the call line is captured, the speech voice of the side that performed the hold operation is not transmitted to the other party. In addition, since it is impossible to make a call while in the holding state, the voice transmitted from the held party is meaningless. Therefore, it can be determined that the speech voice transmitted from the holding side and the voice transmitted from the held side are of low importance while the call is being held/held. Also, in the case of "the unused side during half-duplex communication (such as when an echo suppressor is in operation)" shown in (7), for example, using an echo suppressor, either transmission data or reception data is attenuated, it means that it can be determined that the importance of the attenuated audio signal is low.

The echo suppressor is a technique for suppressing echoes and howling by comparing the signal levels of a transmission signal and a reception signal, passing the signal with the higher signal level and attenuating the opposite signal. In addition, the cases (1) to (7) shown here are examples of cases where it can be determined that the importance of the audio signal to be transmitted/received is low. The importance of the sound signal being played may be determined. For example, a temperature sensor, an illuminance sensor, and the like are provided in the speaker portions of the child devices HS1 to HSn. If it can be determined that the user is putting the handset against the ear, the transmitted/received audio signal is important because it is speech. Otherwise, it can be determined that the importance is low. is.

In the cases of (1) to (4) and (6) described above, determination can be made based on the state of the signal transmitted as the audio signal from the parent devices BS1 to BSn and the child devices HS1 to HSn. In the case of (5) and (7), and in the case of depending on whether or not the slave unit is placed against the ear, the state of the base units BS1 to BSn and the slave units HS1 to HSn, for example, in the control circuit, etc. Since it is grasped, it can be determined based on the state.

[Configuration example of cordless telephone device]
Next, as described above, the main units BS1 to BSn and the handset units HS1 to HSn of the cordless telephone devices 21 to 2n of this embodiment, which have the function of transmitting and receiving control signals without delay even during a call, are arranged. will be described. Base units BS1 to BSn and slave units HS1 to HSn of the plurality of cordless telephone devices 21 to 2n used in the business phone system of this embodiment all have the same configuration. Therefore, in the following description, an example of the configuration of the base unit and the base unit will be described by taking the case of the base unit BS1 and the base unit HS1 of the cordless telephone device 21 as an example.

<Configuration example of master device; Fig. 2>
FIG. 2 is a block diagram showing a configuration example of base station BS1. As shown in FIG. 2, the base unit BS1 includes a control circuit 41 for controlling the entire base unit BS1, a line LSI unit 42, a synchronization signal generation circuit 43, a radio communication circuit 44, an oscillator 45 and a 46 and an insertion/extraction processor 47 .

The control circuit 41 is configured by mounting a computer. The control circuit 41 has a function of performing control such as call control in the base station BS1. The line LSI unit 42 is a circuit for exchanging audio signals, control signals, and synchronization signals with the main unit 1, and includes a division/multiplexing processing unit 421, a control signal processing unit 422, and an audio signal processing unit 421. It consists of a processing section 423 , a synchronization signal detection section 424 and a PLL (Phase locked Loop) section 425 .

The PLL unit 425 is supplied with the oscillation signal of the reference frequency from the oscillator 45 and the multiplexed signal from the main apparatus 1 . In this example, the frequency of the oscillation signal of the oscillator 45 is, for example, 2048 MHz (0.488 nanoseconds (ns)).

The PLL unit 425 extracts the component of the clock signal CK from the timing signal generator of the main unit 1 from the multiplexed signal from the main unit 1 by so-called self-clocking, and combines the extracted clock signal CK component with the oscillator 45 . Then, based on the comparison result, the system clock signal SCK of the master device BS1 synchronized with the clock signal CK component is generated from the oscillation signal of the oscillator 45 .

Then, the PLL unit 425 supplies the generated system clock signal SCK to the division/multiplexing processing unit 421, the control signal processing unit 422, the audio signal processing unit 423, and the synchronization signal detection unit 424, respectively. supply as The PLL unit 425 also supplies the generated system clock signal SCK to the synchronization signal generation circuit 43 in the subsequent stage.

The division/multiplexing processing section 421 is connected to the main apparatus 1 and also connected to the control signal processing section 422 , the audio signal processing section 423 and the synchronization signal detection section 424 . Then, the division/multiplexing processor 421 divides (separates) the control signal, the audio signal, and the reference synchronization signal SYNC from the multiplexed signal from the main unit 1, and transmits the control signal to the control signal processor 422. The signal is supplied to the audio signal processing section 423, and the reference synchronization signal SYNC is supplied to the synchronization signal detection section 424, respectively.

Further, the division/multiplexing processing unit 421 multiplexes the control signal from the control signal processing unit 422 and the audio signal from the audio signal processing unit 423 to generate a multiplexed signal, and the generated multiplexed signal is supplied to the main device 1.

The control signal processing unit 422 is connected to the control signal input/output terminal of the control circuit 41 and also connected to the division/multiplexing processing unit 421, and controls the call at the time of origination, termination, and the like. It is a processing circuit for control signals such as control signals (both control signals from the main device 1 to the cordless telephone device 21 and control signals from the cordless telephone device 21 to the main device 1).

The audio signal processing unit 423 is connected to the radio communication circuit 44 via the insertion/extraction processing unit 47, and is also connected to the division/multiplexing processing unit 421. It is a processing circuit for the received voice signal for transmission and the voice signal for reception from the division/multiplexing processing unit 421 .

The synchronization signal detection unit 424 receives the reference synchronization signal SYNC from the division/multiplexing processing unit 421 and detects a predetermined synchronization signal pattern included in the reference synchronization signal SYNC. A reference synchronization pulse PS having the same period (130 ms) as the reference synchronization signal SYNC, which is synchronized with the reference synchronization signal SYNC, is generated. The synchronizing signal detector 424 supplies the generated reference synchronizing pulse PS to the synchronizing signal generating circuit 43 .

The sync signal generation circuit 43 is composed of a counter 431 and a sync signal generator 432 . The counter 431 is supplied with the preset terminal of the reference synchronous pulse PS having a period of 130 ms from the synchronous signal detector 424 of the line LSI unit 42, and is supplied with the system clock signal SCK from the PLL unit 425 as a count input. . Then, the output count value CNT of this counter 431 is supplied to the synchronization signal generator 432 .

A synchronization signal generator 432 generates a frame synchronization signal FL having a DECT standard frame period (10 ms) from the output count value CNT of the counter 431 . The synchronization signal generation circuit 43 supplies the frame synchronization signal FL generated by the synchronization signal generation section 432 to the wireless communication circuit 44 .

The insertion/extraction processing unit 47 acquires (connects) a call line and inserts a control signal into an audio signal to be transmitted to the handset HS1 when the call line is ready for communication with the other party. It implements a function of extracting the control signal inserted in the audio signal transmitted from the HS1. The inserting function is a function of inserting a control signal into an audio signal to be transmitted to the handset HS1 during a call when there is an interval of low importance. Further, the extraction function is a function of identifying and extracting a control signal when it is inserted into the audio signal transmitted from the handset HS1 during a call.

As shown in FIG. 2 , the insertion extraction processing section 47 includes an insertion section detection section 471 , a control signal insertion section 472 , a control signal extraction section 473 and a noise insertion section 474 . The insertion interval detection unit 471 performs processing for detecting the interval corresponding to the cases (1) to (4) described above for the audio signal from the audio signal processing unit 423 in the previous stage, and outputs the detection result to the control signal insertion unit 472. to notify. Based on the detection result from the insertion section detection section 471, the control signal insertion section 472 inserts the child device provided from the control circuit 41 into the section detected as a section of low importance in the audio signal to be transmitted. A control signal to be transmitted to HS1 is inserted and supplied to the wireless communication circuit 44. FIG.

If the insertion interval detection unit 471 cannot detect the interval corresponding to the above cases (1) to (4), the control signal insertion unit 472 does not perform the control signal insertion processing. . In this case, the audio signal from the audio signal processing unit 423 is supplied to the wireless communication circuit 44 as it is. Further, in this embodiment, since the base unit BS1 does not have an operation unit or a handset, it does not detect the sections corresponding to the cases (5) and (7) described above. In other words, the user does not operate the base unit, and since there is no transmitter/receiver, no echo or howling occurs, and basically there is no case of half-duplex communication.

However, when a holding operation is performed through the handset HS1, which will be described later, the cordless telephone device 21 comprising the base BS1 and the handset HS1 is placed on hold. In this case, between the base unit BS1 and the handset HS1, the audio signal from the base unit BS1 to the handset (audio signal from the other party of the call) and the audio signal from the handset to the base unit (holding tone) audio signal picked up by the slave unit HS1) is less important. Therefore, the insertion period detection unit 471 inserts the control signal into the voice signal from the other party of the call during the period from when the device enters the hold state to when the hold state is released. 472 is notified. As a result, the control signal can be inserted into the voice signal sent from the base unit BS1 to the slave unit HS1 when the call is put on hold from the base unit BS1.

It should be noted that the fact that the own machine has entered the holding state and the fact that the holding state of the own machine has been canceled is determined by the control circuit according to the control signal inserted in the A field (first field) of the slot from HS1. 41 may grasp and notify the insertion/extraction processing unit 47 . Further, as will be described below, the control circuit 41 is controlled according to the control signal inserted in the audio signal of the B field (second field) from HS1 extracted by the control signal extraction unit 473 of the insertion/extraction processing unit 47. grasps and notifies the insertion/extraction processing unit 47 .

FIG. 3 is a diagram for explaining a sample audio signal in which a section of low importance exists, and an audio signal in which a control signal is inserted in the section of low importance. Also, FIG. 4 is a diagram for explaining an example of a control signal to be inserted into an audio signal. First, in the insertion period detection unit 471, as shown in FIG. Detect less important intervals, such as those where . The insertion period detection unit 471 detects from where to where in the one-slot audio signal to be transmitted to the child device HS1 is the less important period.

Then, as described above, the control signal inserting unit 472, based on the detection output of the inserting interval detecting unit 471, detects the interval detected as having low importance in the one-slot audio signal to be transmitted to the child device HS1. , the control signal from the control circuit 41 is inserted. In this case, the control signal inserting unit 472 inserts an insertion interval start code, which is a predetermined code indicating that the control signal has been inserted, at the beginning of the interval into which the control signal is to be inserted. In this embodiment, the insert interval start code is "FFFFFF" in hexadecimal.

Further, the control signal inserting unit 472 inserts information indicating how many digits of the control signal has been inserted next to the insertion interval start code. As shown in FIG. 8B, the B field used to transmit the voice signal is a 320-bit (40-byte) area, and can transmit data of 80 hexadecimal characters. Therefore, the information indicating how many digits the control signal has been inserted may be two hexadecimal digits (8 bits). In this way, the control signal obtained from the control circuit 41 is inserted following the insertion section start code indicating that the control signal has been inserted and the information indicating the number of digits of the inserted control signal.

Therefore, as shown in FIG. 3(A), if an interval in which the hexadecimal value "0" continues as a voice signal can be detected for 39 hexadecimal characters, the interval shown in FIG. 3(B) can be detected in this interval. As shown, the insertion section start code "FFFFFF" indicating that the control signal has been inserted, the 2-digit hexadecimal information "1F" indicating the number of digits of the control signal, and then the control signal for 31 characters in hexadecimal. inserted. That is, "1F" in hexadecimal is "31" in decimal.

Therefore, in the case of the sample audio signal shown in FIG. 3(A), 39 hexadecimal characters of 320-bit audio signals to be transmitted in one slot to the handset HS1 are less important. interval is detected. A control signal is inserted into this section as shown in FIG. 3B and summarized in FIG. As for the details, the insertion section start code "FFFFFF (hexadecimal)" of the control signal is inserted into the first six characters of the section. Following this, two-digit data indicating the data length of the inserted control signal, in this example, "1F (hexadecimal number)" is inserted. Following this, a control signal of "1F (hexadecimal number)"="31 (decimal number)" digits is inserted. Although details will be described later, control signals are also inserted in the less important sections of the audio signal transmitted from the handset HS1 to the base BS1 in the manner described with reference to FIGS. be.

On the other hand, the control signal extraction unit 473 of the insertion/extraction processing unit 47 confirms the audio signal from the handset HS1, specifies the section in which the control signal is inserted, extracts the control signal, and sends it to the control circuit 41. supply. That is, when the control signal is inserted into the audio signal, the control signal extracting unit 473 detects the insertion section start code "FFFFFF (hexadecimal)" added to the head of the control signal, thereby extracting the control signal. It specifies that the signal is inserted and the head position of the control signal. Since information indicating the data length of the inserted control signal is added immediately after the insertion interval start code, the end position of the control signal is specified based on the information indicating the data length of the control signal. . A control signal is extracted from the specified leading position to the trailing position.

Based on the detection result of the control signal extraction unit 473, the noise insertion unit 474 inserts white noise instead of the control signal into the interval in which the control signal is inserted in the audio signal to be processed. conduct. As a result, when the audio signal in which the control signal has been inserted is reproduced as it is, it is possible to prevent the inconvenience that the user on the reproduction side will hear an unpleasant sound. When no control signal is inserted into the audio signal from the child device HS1, the audio signal from the child device HS1 is supplied as is to the audio signal processing unit 423 and processed as usual.

In this manner, the insertion interval detection section 471 and the control signal insertion section 472 implement the function of inserting the control signal into the audio signal. Also, the control signal extractor 473 and the noise inserter 474 implement a function of extracting the control signal inserted into the audio signal.

Next, the radio communication circuit 44 will be explained. The radio communication circuit 44 is configured with a control section 441 , a TDMA modulation/demodulation section 442 and an RF section (radio communication section) 443 . The RF unit 443 is a circuit unit for wireless communication with the slave device HS1. The control unit 441 is connected to the TDMA modulation/demodulation unit 442 and the RF unit 443 as well as to the control circuit 41 . The control section 441 controls the overall operation of the radio communication circuit 44 and supplies a control signal based on the control signal obtained from the control circuit 41 to the TDMA modulation/demodulation section 442 .

The TDMA modulation/demodulation section 442 is connected to the control section 441 and the insertion/extraction processing section 47 as well as to the RF section 443 . The TDMA modulation/demodulation unit 442 modulates the control signal from the control unit 441 and the audio signal from the insertion/extraction processing unit 47 for transmission to the child device HS1. The signal modulated by this TDMA modulation/demodulation section 442 is transmitted through the RF section 443 to the handset HS1. Further, the TDMA modulation/demodulation unit 442 demodulates the audio signal and the control signal from the signal received by the RF unit 443 from the handset HS1, supplies the demodulated audio signal to the insertion/extraction processing unit 47, and demodulates the control signal. The signal is supplied to the control section 441 .

The TDMA modulation/demodulation section 442 has a PLL section 4421 for clock generation. The PLL section 4421 is supplied with the oscillation signal from the oscillator 46 and the frame synchronization signal FL from the synchronization signal generation circuit 43 . The PLL unit 4421 compares the phases of the frame synchronization signal FL from the synchronization signal generation circuit 43 and the oscillation signal from the oscillator 46, and based on the comparison result, synchronizes the oscillation signal of the oscillator 46 with the frame synchronization signal FL. generate timing and clock signals for

The TDMA modulation/demodulation unit 442 uses a timing signal and a clock signal synchronized with the frame synchronization signal FL to generate a transmission signal to the handset HS1 in a period corresponding to one slot in the downlink that can be allocated and used. At the same time, one of the slots in the uplink is used to process the signal received from the handset HS1.

It should be noted that base unit BS1 is connected to main unit 1, and as described above, starts synchronization processing for communication with handset HS1, and always sends a transmission signal to handset HS1. Then, the control unit 441 of the wireless communication circuit 44 of the base unit BS1 transmits the transmission signal generated by the TDMA modulation/demodulation unit 442 to the handset HS1 through the RF unit 443 using one slot set in the own base unit. . In response to this, when a response is returned from the child device HS1, the control unit 441 selects the slot used for transmitting the transmission signal for the downlink, and the slot for receiving the response from the child device HS1. Synchronization is established for uplink, and control is performed for transmission and reception.

<Configuration example of slave unit; Fig. 5>
FIG. 5 is a block diagram showing a configuration example of the handset HS1. As shown in FIG. 5, the slave device HS1 includes a wireless communication circuit 51, a control circuit 52, a codec circuit 53, an oscillator 54, a microphone 55, a speaker 56, an insertion/extraction processor 57, and an operation unit 58. , and a sensor unit 59 . The microphone 55 constitutes a transmitter, and the speaker 56 constitutes a receiver.

The radio communication circuit 51 includes a control section 511 , a TDMA modulation/demodulation section 512 and an RF section (radio communication section) 513 . RF unit 513 is a circuit unit for performing wireless communication with base device BS1. The control unit 511 is connected to the TDMA modulation/demodulation unit 512 and the RF unit 513 as well as to the control circuit 52 . The control unit 511 controls the overall operation of the radio communication circuit 51 and supplies a control signal based on the control signal obtained from the control circuit 52 to the TDMA modulation/demodulation unit 512 .

The TDMA modulation/demodulation section 512 is connected to the control section 511 and the RF section 513 , and is also connected to the codec circuit 53 via the insertion/extraction processing section 57 . TDMA modulation/demodulation section 512 modulates the control signal from control section 511 and the audio signal from codec circuit 53 provided via insertion/extraction processing section 57 for transmission to base station BS1. The signal modulated by this TDMA modulation/demodulation section 512 is transmitted through RF section 513 to base station BS1. Further, TDMA modulation/demodulation section 512 demodulates an audio signal and a control signal from the received signal from base station BS1 received by RF section 513, and demodulates the demodulated audio signal to codec circuit 53 via insertion/extraction processing section 57. The supplied and demodulated control signal is supplied to the control section 511 .

The TDMA modulation/demodulation section 512 has a PLL section 5121 for clock generation. The oscillation signal from the oscillator 54 is supplied to the PLL section 5121, and the demodulation signal of the received signal from the RF section 513 is supplied. A clock signal synchronized with the clock component of the demodulated signal is generated. The clock signal from this PLL section 5121 is used as a processing clock signal in the TDMA modulation/demodulation section 512 .

The codec circuit 53 decodes the audio signal demodulated by the TDMA modulation/demodulation unit 512, converts it into an analog audio signal, supplies the analog audio signal to the speaker 56, and emits it as received audio. Also, the codec circuit 53 encodes the analog audio signal picked up by the microphone 55 and supplies it to the TDMA modulation/demodulation section 512 via the insertion/extraction processing section 57 .

Note that the control circuit 52 transmits a call control signal at the time of call origination to the base unit BS1 through the wireless communication circuit 51 when the handset HS1 makes a call, and controls the call when the base unit BS1 receives a call. When the signal is received, processing such as emitting a ringing tone from the speaker 56 is performed.

The insertion/extraction processing unit 57 is a portion corresponding to the insertion/extraction processing unit 47 of the parent device BS1 described above. That is, the insertion/extraction processing unit 57 has a function of capturing (connecting) a communication line and inserting a control signal into an audio signal to be transmitted to the base unit BS1 when a communication with the other party is possible; and a function of extracting the control signal inserted in the audio signal transmitted from the base station BS1. The inserting function is a function of inserting a control signal into an audio signal to be transmitted to base station BS1 during a call when there is an interval of low importance. The extracting function is a function of identifying and extracting a control signal, if one is inserted in the voice signal transmitted from the base station BS1 during a call.

As shown in FIG. 5 , the insertion/extraction processing section 57 includes a control signal extraction section 571 , a noise insertion section 572 , an insertion section detection section 573 , and a control signal insertion section 574 . Control signal extraction section 571 checks the audio signal from base station BS1 demodulated by TDMA modulation/demodulation section 512, specifies the section in which the control signal is inserted, extracts the control signal, and sends it to control circuit 52. supply to Assume that the control signal is inserted into the audio signal from base station BS1 in the manner described with reference to FIGS.

In this case, the control signal extraction unit 571 detects the insertion section start code "FFFFFF (hexadecimal)" added to the head of the control signal in the supplied audio signal from the base unit BS1. , specifies that the control signal is inserted and the head position of the control signal. Since information indicating the data length of the inserted control signal is added immediately after the insertion interval start code "FFFFFF (hexadecimal number)", the control signal can be controlled based on the information indicating the data length of the control signal. Identify the end position of the signal. The control signal from the specified leading position to the trailing position is extracted, supplied to the control circuit 52, and made available as a control signal.

Based on the detection result of the control signal extraction unit 571, the noise insertion unit 572 inserts white noise instead of the control signal into the interval in which the control signal of the audio signal to be processed is inserted. do. As a result, when the audio signal in which the control signal has been inserted is reproduced as it is, it is possible to prevent the inconvenience that the user on the reproduction side will hear an unpleasant sound. If no control signal is inserted into the audio signal from the child device HS1, the audio signal from the child device HS1 passes through the control signal extraction unit 571 and the noise insertion unit 572 as they are, and is sent to the codec circuit 53. supplied and processed (recycled) as usual.

On the other hand, the insertion section detection unit 573 detects a section corresponding to the above-described cases (1) to (4) in the audio signal picked up by the microphone 55 and converted into a digital signal by the codec circuit 53. and notifies the control signal insertion unit 574 of the detection result. Based on the detection result from the insertion section detection section 573, the control signal insertion section 574 inserts the parent device provided from the control circuit 52 into the section detected as a section of low importance in the audio signal to be transmitted. A control signal to be transmitted to BS1 is inserted and supplied to the wireless communication circuit 51. FIG.

Note that if the insertion interval detection unit 573 cannot detect the interval corresponding to the cases (1) to (4) described above, the control signal insertion unit 574 does not perform the control signal insertion processing. . In this case, the audio signal from the codec circuit 53 is supplied to the wireless communication circuit 51 as it is. In this embodiment, since the handset HS1 includes the operation unit 58, the microphone 55, and the speaker 56, it also detects the section corresponding to the cases (5) to (7) described above.

That is, as shown in FIG. 3, an operation unit 58 is connected to the control circuit 52 . The operation unit 58 includes so-called numeric keys (ten keys) and some function keys, receives operation inputs from the user, converts them into electrical signals, and notifies the control circuit 52 of them. Therefore, the control circuit 52 notifies the insertion/extraction processing unit 57 of this when detecting that the slave unit is being operated for purposes other than calling, such as during menu operation.

As a result, when the control circuit 52 notifies the insertion section detection section 573 of the insertion extraction processing section 57 that the handset is being operated for purposes other than calling, such as during menu operation, The audio signal from the codec circuit 53 is determined to be of low importance. Then, the insertion interval detection unit 573 notifies the control signal insertion unit 574 of the interval determined to be of low importance in the audio signal from the codec circuit 53 .

Further, when the handset HS1 accepts a holding operation through the operation unit 58, the cordless telephone device 21 consisting of the base BS1 and the handset HS1 is placed in a holding state, and in this case, a message is transmitted from HS1 to the other party of the call. The importance of audio signals to be played is reduced. Therefore, the insertion period detection unit 573 detects the audio signal from the codec circuit 53 as a low-importance period from when the device enters the hold state to when the hold state is released. Notify 574. As a result, the control signal is inserted into the audio signal from the handset HS1 to the base BS1 when the call is put on hold from the handset HS1.

When the cordless telephone device 21 consisting of the base unit BS1 and the handset HS1 is on hold, for example, the base unit BS1 or the main unit transmits a holding tone to the other party. However, since the hold tone transmitted to the other party of the call is not particularly important between the base unit BS1 and the handset HS1, the importance of the voice signal from the handset HS1 to the base unit BS1 during the hold is judged to be low, no problem will arise.

Also, the unused side during half-duplex communication (echo suppressor operation, etc.) shown in (7) can be determined by the codec circuit 53 and the control circuit 52 functioning. That is, the codec circuit 53 implements a half-duplex communication function such as an echo suppressor function. Therefore, when the half-duplex communication is to be performed, the codec circuit 53 notifies the control circuit 52 of the state. Therefore, the control circuit 52 notifies the insertion/extraction processor 57 of the state during half-duplex communication.

As a result, in the codec circuit 53, the audio signal transmitted to the base unit BS1, that is, the audio signal section in which the audio signal collected through the microphone 55 is attenuated can be determined to be less important. Since the control signal insertion unit 574 is notified of the section, the control signal can be inserted into the section of the base device BS1.

Further, the handset HS1 includes a sensor section 59 . The sensor unit 59 is composed of, for example, a temperature sensor and an illuminance sensor, and can detect whether the user is making a call with the speaker 56 placed against his/her ear or not. The detection result of the sensor unit 59 is notified to the control circuit 52 . For this reason, the control circuit 52 detects that the speaker 56 is not in contact with the user's ear while the communication line is connected. It can be determined that the importance of the voice signal to be transmitted to the machine BS1 is low.

Therefore, if it is detected that the speaker 56 is not in contact with the user's ear while the telephone line is connected, the control circuit 52 inserts and extracts this information into the insertion extraction processing section. Notify 57. When the insertion section detection unit 573 of the insertion extraction processing unit 57 is notified that the speaker 56 is not in contact with the user's ear while the telephone line is connected, The relevant section of the audio signal to be transmitted to base station BS1 is determined as a section of low importance. This determination result is notified to the control signal inserting section 574, and the control signal from the control circuit 52 can be inserted into the interval and provided to the base device BS1.

Even when the user of the handset HS1 is operating the operation unit 58, the sensor unit 59 detects that the speaker 56 is not in contact with the ear of the user. For this reason, in the case of the handset equipped with the sensor section 59, when the telephone line is connected, the speaker 56 portion does not detect that the operation section 58 is being operated. If it is detected that it is not applied to the ear portion, it is possible to determine a less important section of the audio signal to be transmitted to base unit BS1.

In other words, if the speaker 56 is not in contact with the user's ear while the call line is connected, the call may be interrupted for some reason, including when the operation unit 58 is being operated. It is possible to detect when something that should be done with higher priority is occurring. In this case, no call is made, so it can be determined that the audio signal corresponding to the section in which no call is made is of low importance.

In this way, the control signal extractor 571 and the noise inserter 572 implement the function of extracting the control signal inserted into the audio signal. Also, the insertion period detection unit 573 and the control signal insertion unit 574 implement the function of inserting the control signal into the audio signal.

The above description is for the base unit BS1 and the handset HS1 of the cordless telephone device 21, but as described above, the base units BS2 to BSn and the handset units HS2 to HSn of the other cordless telephone devices 22 to 2n are described. have the same configuration.

[Processing of main unit and sub unit during a call]
Next, a description will be given of the processing performed in each of the master unit and the slave unit that constitute the cordless telephone device when the telephone line is connected and a telephone call is possible. Although the case of the cordless telephone device 21 consisting of the base unit BS1 and the slave unit HS1 will be described here as an example, similar processing is performed in each of the cordless telephone units 22 to 2n.

<Processing for transmitted audio signal>
FIG. 6 is a sequence diagram for explaining processing when a voice signal is transmitted from handset HS1 to base BS1 when a call line is connected and a call is possible. When the communication line is connected and communication is possible, the microphone 55 of the handset HS1 collects the voice (sent voice) uttered by the user and supplies it to the codec circuit 53 (step SP11). The codec circuit 53 of the handset HS1 converts the analog audio signal from the microphone 55 into a digital audio signal, and supplies this to the insertion section detection section 573 of the insertion extraction processing section 57 (step SP12).

Then, the insertion section detection section 573 and the control signal insertion section 574 cooperate to detect a section of low importance in the audio signal from the codec circuit 53, and insert the control signal provided from the control circuit 52 in the detected section. It is inserted and supplied to the wireless communication circuit 51 (step SP13). In step SP13, the insertion interval detection unit 573 detects a less important interval in the audio signal from the codec circuit 53 based on the state of the audio signal supplied thereto or information from the control circuit 52, This is notified to the control signal insertion unit 574 .

The detection processing performed by the insertion section detection unit 573 detects sections corresponding to the cases (1) to (7) described above in the audio signal supplied to the base unit BS1. In addition, in this embodiment, the insertion section detection unit 573 detects a section in which the speaker 56 is not placed against the user's ear in the audio signal to be transmitted to the base unit BS1. It is also possible to specify as

Then, in step SP13, the control signal inserting section 574 inserts the control signal from the control circuit 52 into the section detected by the inserting section detecting section 573 in the audio signal supplied through the inserting section detecting section 573. This control signal inserting process is the same as the process performed by the control signal inserting unit 472 of the base unit BS1 described with reference to FIGS. Note that if insertion interval detection section 573 cannot detect an interval of low importance in the audio signal to be transmitted to base unit BS1, the audio signal from codec circuit 53 is provided to wireless communication circuit 51 as is. be.

Radio communication circuit 51 forms a transmission signal shown in FIG. 8 from the audio signal from control signal inserting section 574 and the control signal from control section 511, and transmits the transmission signal to master device BS1 (step SP14). ). Therefore, in the case of this example, the control signal is transmitted through the A field shown in FIG. sent. As a result, the control signal from handset HS1 can be transmitted to base BS1 without delay even in a state where communication is possible.

On the other hand, the base unit BS1 analyzes the signal received from the slave unit HS1 to extract the control signal and supplies it to the control circuit 41 to make it available (step SP15). First, in step SP15, the signal received from the handset HS1 is demodulated by the TDMA modulation/demodulation section 442, the A field control signal is extracted, and supplied to the control circuit 41 through the control section 441 for use.

Further, in step SP15, the B-field audio signal demodulated by the TDMA modulation/demodulation section 442 is supplied to the control signal extraction section 473 of the insertion/extraction processing section 47. FIG. If a control signal is inserted in the supplied audio signal, the control signal extraction unit 473 identifies the insertion interval, extracts the inserted control signal, and supplies it to the control circuit 41. , make available.

Next, the audio signal from which the control signal has been extracted by the control signal extractor 473 is supplied to the noise inserter 474 . Since the audio signal is in a state in which the control signal has been inserted, if the other party reproduces the audio signal as it is, there is a possibility that an offensive audio will be reproduced. Therefore, the noise inserting unit 474 overwrites white noise in the section in which the control signal is inserted in the supplied audio signal (step SP16). That is, the noise inserting unit 474 cancels the control signal inserted in the audio signal so that even if it is reproduced as an audio signal, the sound will not be harsh.

After that, the voice signal from handset HS1 is transmitted to main unit 1 through base unit BS1 (step SP17), and sent from main unit 1 to an outside line (telephone network) (step SP18). sent to. In this way, the control signal is inserted into the less important section of the audio signal (transmitted voice) from the slave unit HS1 and provided to the base unit BS1 so that the master unit can extract and use the control signal. Audio signals of high importance from the device HS1 are appropriately transmitted to the other party of the call.

<Processing for received audio signal>
FIG. 7 is a sequence diagram for explaining processing when a voice signal is transmitted from base unit BS1 to handset HS1 when a communication line is connected and communication is possible. When the communication line is connected and the communication is possible, the voice signal (received voice) from the other party of the communication is supplied to the main unit 1 through the outside line (telephone network) (step SP21). is supplied to base station BS1 through (step SP22).

In base unit BS1, the audio signal from the other party of the call supplied via main unit 1 is supplied to insertion interval detection unit 471 of insertion extraction processing unit 47 through audio signal processing unit 423 of line LSI unit 42. be. Then, the insertion interval detection unit 471 and the control signal insertion unit 472 cooperate to detect an interval of low importance in the voice signal from the other party of the call, and the control signal is provided from the control circuit 41 in the detected interval. is inserted and supplied to the wireless communication circuit 44 (step SP23).

At step SP23, the insertion interval detection unit 471 detects a less important interval in the audio signal from the audio signal processing unit 423 based on the state of the audio signal supplied thereto or information from the control circuit 41. and notifies the control signal insertion unit 472 of this. The detection processing performed by the insertion section detection unit 471 detects sections corresponding to the above-described cases (1) to (4) and (6) in the audio signal supplied to the child device HS1.

Then, in step SP23, the control signal inserting section 472 inserts the control signal from the control circuit 41 into the section detected by the inserting section detecting section 471 in the audio signal supplied through the inserting section detecting section 471. This control signal insertion process is the process described with reference to FIGS. Note that if the insertion interval detection unit 471 cannot detect an interval of low importance in the audio signal to be transmitted to the handset HS1, the audio signal from the other party of the call supplied via the main unit is , is provided to the wireless communication circuit 44 as it is.

Radio communication circuit 44 forms a transmission signal having the form shown in FIG. and transmit (step SP24). Therefore, in the case of this example, the control signal is transmitted through the A field shown in FIG. sent. As a result, the control signal from base unit BS1 can be transmitted to handset unit HS1 without delay even in a state in which communication is possible.

On the other hand, the slave unit HS1 analyzes the received signal from the base unit BS1 to extract the control signal and supplies it to the control circuit 52 so that it can be used (step SP25). First, in step SP25, the signal received from base station BS1 is demodulated in TDMA modem section 512, the A field control signal is extracted, and supplied to control circuit 52 through control section 511 for use.

Further, in step SP25, the B-field audio signal demodulated by the TDMA modem section 512 is supplied to the control signal extraction section 571 of the insertion extraction processing section 57. FIG. If a control signal is inserted in the supplied audio signal, the control signal extraction unit 571 identifies the insertion interval, extracts the inserted control signal, and supplies it to the control circuit 52. , make available.

Next, the audio signal from which the control signal has been extracted by the control signal extractor 571 is supplied to the noise inserter 572 . Since the audio signal is in a state in which the control signal has been inserted, if the codec circuit 53 reproduces the audio signal as it is, there is a possibility that an offensive audio will be reproduced. Therefore, the noise inserting unit 572 overwrites white noise in the section in which the control signal is inserted in the supplied audio signal (step SP26). That is, the noise inserting unit 572 cancels the control signal inserted in the audio signal so that even if it is reproduced as an audio signal, the sound will not be offensive.

After that, the audio signal from the base station BS1 is supplied to the codec circuit 53 and D/A converted (step SP27), and the converted analog audio signal is supplied to the speaker 56 to emit the received voice. (Step SP28). In this way, the control signal is inserted into the less important section of the voice signal (received voice) from the master device BS1 and provided to the slave device HS1 so that the slave device HS1 can extract and use the control signal. An audio signal of high importance from the other party of the call provided via the handset BS1 is appropriately provided to the user of the handset HS1 via the handset HS1.

[Effects of Embodiment]
As described above, in the cordless telephone devices 21 to 2n of this embodiment, even during a call, between the masters BS1 to BSn and the slaves HS1 to HSn, voice signals are transmitted through intervals of low importance. Control signals can be sent and received. As a result, even when a call line is connected and a call is possible, the field used in the call can be effectively used, and the control signals that need to be sent and received can be sent and received between the parent and child units without delay. can be sent and received between As a result, it is possible to prevent delays in the LCD display of the handset and occurrence of time lags in the notification of incoming calls. In addition, it is possible to notify the main device of the operation status of the child device without delay through the parent device.

[Modification]
In the above-described embodiment, the A field of the transmission data for the slot (FIG. 8B) is used to transmit the control signal as usual, and the less important section of the voice signal to be transmitted is used. to transmit the necessary control signals. However, it is not limited to this. If the control signal that needs to be transmitted can be transmitted without delay using the less important section of the voice signal, there is no need to transmit the control signal using the A field of the transmission data for one slot. .

Further, during a non-communication period in which the communication line is released, the system described in Japanese Patent Laid-Open No. 2002-200000, in which the B field of the transmission data for one slot is used to transmit the control signal, may also be used. In addition, when there is no other cordless telephone device in the vicinity, the system described in Patent Document 2 is also used in which control signals are transmitted by using the empty slots of other cordless telephone devices. You may do so.

Further, the method of identifying the less important section of the audio signal to be transmitted is not limited to the cases (1) to (7) described above. For example, when a predetermined hold tone is being transmitted, it can be determined that the importance of the voice signal from the other party of the call is low. Also, when it can be determined that the voice signal to be transmitted is clearly not the speech voice, it can be determined that the importance of the voice signal is low. In this way, the importance of the voice signal to be transmitted can be determined if it can be determined according to the characteristics of the voice signal and the state of operation of the cordless telephone device at the time of transmission.

In the above-described embodiment, the case where this fitting is applied to a cordless telephone device consisting of a base unit and a slave unit that perform wireless communication according to the DECT standard communication method has been described as an example, but the present invention is limited to this. is not. INDUSTRIAL APPLICABILITY The present invention can be applied to a cordless telephone device that constitutes a business phone system, in which wireless communication is performed between a base unit and a slave unit using various communication methods.

[others]
As can be seen from the above description of the embodiment, the function of the base device side determination means in the claims is realized by the insertion section detection section 471 of the base device BS1 of the embodiment, and the base device side insertion means in the claims is realized. The function of is realized by the control signal insertion unit 472 of the base unit BS1 of the embodiment. Further, the function of the child device side extraction means in the claims is realized by the control signal extraction unit 571 of the child device HS1 of the embodiment, and the function of the child device side alternative means in the claims is realized by the child device HS1 of the embodiment. is realized.

Further, the function of the child device side determination means in the claims is realized by the insertion section detection unit 573 of the child device HS1 of the embodiment, and the function of the child device side insertion means in the claims is realized by the child device HS1 of the embodiment. is realized. Further, the function of the master device side extraction means in the claims is realized by the control signal extraction unit 473 of the master device BS1 of the embodiment, and the function of the master device side alternative means in the claims is realized by the master device BS1 of the embodiment. is realized.

The method of transmitting and receiving control signals between the base unit and the slave unit described with reference to the sequence diagrams of FIGS. 6 and 7 is the control signal transmission method applied to the cordless telephone apparatus of the present invention. In other words, for signals transmitted and received between the base unit BS1 and the slave unit HS1, a control signal is inserted into a less important section of the audio signal transmitted from the own unit and transmitted, This is a method of extracting the inserted control signal and making it available.

Reference Signs List 1 main device 21 to 2n cordless telephone device BS1 to BSn master device 41 control circuit 42 circuit LSI unit 421 division/multiplexing processing unit 422 control signal processing unit 423 Audio signal processing unit 424 Synchronization signal detection unit 425 PLL unit 43 Synchronization signal generation circuit 431 Counter 432 Synchronization signal generation unit 44 Wireless communication circuit 441 Control unit 442 TDMA modulation/demodulation Section 443... RF section 4421... PLL section 45, 46... Oscillator 47... Insertion extraction processing section 471... Insertion section detection section 472... Control signal insertion section 473... Control signal extraction section 474... Noise insertion Unit HS1 to HSn Child device 51 Wireless communication circuit 511 Control unit 512 TDMA modulation/demodulation unit 5121 PLL unit 513 RF unit 52 Control circuit 53 Codec circuit 54 Oscillator 55... Microphone, 56... Speaker, 57... Insertion extraction processing unit, 571... Control signal extraction unit, 572... Noise insertion unit, 573... Insertion interval detection unit, 574... Control signal insertion unit, 58... Operation unit, 59... Sensor Department

Claims (6)

A first field for control signal transmission and a second field for audio signal transmission having a data length longer than that of the first field are provided between the master and the slave. A cordless telephone device that transmits signals in units of transmission and uses a TDMA (Time Division Multiple Access) / TDD (Time Division Duplex) wireless communication system,
The parent device
When in call seizure state,Send to far end of callAudio signal to be sentand receive from the far end of the callaudio signal to be receivedThen, a predetermined detection process is performed,a first base unit side determination means for determining whether or not it is necessary to transmit an audio signal as call audio;
Including the state of whether or not the operating unit is being operated and whether or not the own unit is on hold when the own unit has an operating unit. A parent device control means for grasping the operating state of the device and controlling each part;
The operating state of the own device ascertained by the base device control means when in the call capture stateThe state of whether or not the operating unit is being operated and whether the own unit is on hold when the own unit has an operating unit.a second parent device side determination means for determining whether or not it is necessary to transmit an audio signal as a call voice based on;
When it is determined by the first base unit side determining means or the second base unit side determining means that there is no need to transmit the voice signal as the call voice, the second field is used. a parent device side inserting means for inserting a control signal to be transmitted to the child device into a corresponding section of an audio signal to be transmitted to the child device;
with
The child device is
child device side extracting means for extracting and making available the control signal inserted in the audio signal from the parent device;
slave unit side substitution means for substituting a predetermined signal, which is not inconvenient even if it is reproduced as an audio signal, for the control signal in the section in which the control signal is inserted in the audio signal from the master unit;
A cordless telephone device comprising: A cordless telephone device according to claim 1, wherein
The child device is
When in call seizure state,Send to far end of callAudio signal to be sentand receive from the far end of the callAudio signal to be receivedPerform a predetermined detection process fora first handset side determination means for determining whether or not it is necessary to transmit an audio signal as call audio;
Includes the status of whether or not the control panel of the own machine is being operated, whether or not the own machine is on hold, and whether or not the own machine is on the unused side during half-duplex communication. slave unit control means for grasping the operating state of the own unit and controlling each part;
The operating state of the own device ascertained by the handset control means when in the call capture stateThe state of whether or not the operation unit of the own machine is being operated, whether or not the own machine is on hold, and whether or not the own machine is on the unused side during half-duplex communication.a second handset side determination means for determining whether or not it is necessary to transmit an audio signal as a call voice based on;
When it is determined by the first handset side determining means or the second handset side determining means that it is not necessary to transmit the voice signal as the call voice, the second field is used. slave unit side inserting means for inserting a control signal to be transmitted to the master unit into a corresponding section of an audio signal to be transmitted to the master unit;
with
The parent device
parent device side extraction means for extracting and making available the control signal inserted in the audio signal from the child device;
parent device side replacement means for replacing the control signal in the section in which the control signal of the audio signal from the child device is inserted with predetermined data that is not inconvenient even if it is reproduced as an audio signal;
A cordless telephone device comprising: A cordless telephone device according to claim 1 or claim 2,
A cordless telephone apparatus according to claim 1, wherein said base unit side inserting means adds information indicating that it is a control signal and information indicating a control signal length to said control signal to be inserted. A cordless telephone device according to claim 2, wherein
A cordless telephone apparatus according to claim 1, wherein said slave unit side inserting means adds information indicating that it is a control signal and information indicating a control signal length to said control signal to be inserted. A cordless telephone device according to claim 1 or claim 2,
The first base unit side determination means determines, with respect to the transmitted audio signal, a case where an audio signal of a certain volume level or more is not continuously detected, a case where a silence detection area continues for a certain size or more, and an RTP ( When the audio signal for one packet sent by Real time Transport Protocol) is silent, when the audio signal to be sent matches white noise data, and when the received audio signal is a predetermined hold tone is detected, it is determined that there is no need to transmit the audio signal as call audio,
The second base unit side determination means determines whether the operating state of the base unit grasped by the base unit control unit is either a state of operation other than for a call or a state of being put on hold. , a cordless telephone device characterized by determining that there is no need to transmit an audio signal as call audio. A cordless telephone device according to claim 2, wherein
The first handset-side discriminating means determines, with respect to the audio signal to be transmitted, a case where an audio signal of a certain volume level or more is not continuously detected, a case where a silence detection area continues for a certain size or more, and an RTP ( When the audio signal for one packet sent by Real time Transport Protocol) is silent, when the audio signal to be sent matches white noise data, and when the received audio signal is a predetermined hold tone is detected, it is determined that there is no need to transmit the audio signal as call audio,
The second handset-side determination means determines whether the operating state of the handset grasped by the handset control means is an operating state other than a call use state , a holding state , and a half-duplex communication state. A cordless telephone device characterized in that it is determined that it is not necessary to transmit a voice signal as a call voice when the state is either the state of the unused side or the state of the unused side.

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