JP3144015B2 - Digital telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital telephone housed in a private branch exchange as a dedicated telephone.

[0002]

2. Description of the Related Art In recent years, in a private telephone housed in a private branch exchange, processing of a voice band signal in the telephone is performed by
Digital processing is becoming mainstream.

Conventionally, this kind of digital telephone is shown in FIG.
In general, an audio band signal is processed by the configuration shown in FIG. Hereinafter, the configuration will be described. Here, parts not directly related to the processing of the audio band signal are not shown.

In FIG. 2, a main control unit 1 includes a control bus 2
, Control the DTMF signal output unit 3, the ringtone output unit 4, the transmission gain control unit 5, the reception gain control unit 6, the A control register 7, and the B control register 8. The PCM data path connection unit 9 and the analog switch unit 10 are controlled by outputs of an A control register 7 and a B control register 8, respectively. The digital line interface unit 11 connects a digital telephone and a private branch exchange, and controls transmission of a digital voice band signal by, for example, ping-pong transmission or the like. This digital voice band signal is converted into an analog signal by the PCM codec 12, and the amplifiers 13, 1
4 to a speaker of a receiver 15 and a speaker 16 for a loudspeaker. Conversely, analog signals input from the microphone of the receiver 15 and the microphone 17 for the loudspeaker are input to the PCM codec 12 via the amplifiers 18 and 19, respectively, and are converted into digital voice band signals.

In the above-described configuration, the main control unit 1 controls the A control register 7 and the B control register 8 according to the state of the audio band signal processing, and the PCM data path as shown in FIG. The switch of the connection unit 9 and the switch of the analog switch unit 10 are controlled. That is, the PCM data path must always be controlled according to the situation.
The control contents for the control bits of the A control register and the B control register at this time are shown in (b) to (f) of (Table 2).

[0006]

[Table 1]

[0007]

[Table 2]

[0008]

In such a conventional digital telephone, for example, when an attempt is made to add a loudspeaker function, the switch of the PCM data path connection section is fixedly assigned, so that the loudspeaker processing is performed. Addition of departments,
Significant changes in hardware such as modification of the PCM data path connection are involved. That is, there is a problem that it is not possible to flexibly respond to a function change.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a digital telephone capable of adding and changing functions without largely changing hardware.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a plurality of signal processing means having a common hardware and different software for realizing a signal processing function are provided.
A first PCM data path connection unit including a switch for selecting an M data conversion unit, an addition processing unit, and PCM data from an arbitrary signal processing unit and inputting the selected data to the addition processing unit; and a second equivalent PCM data path connection unit. PCM data path connection means is provided.

[0011]

According to the present invention, the control section reads out the contents of the status registers of the plurality of signal processing sections to identify the signal processing function of the signal processing section, and the first PCM data path connection section and the second PCM data path connection section. After establishing the processing route of the voice band signal by using the signal processing means having the necessary functions according to the operating state such as during a call, ringing the bell, dialing, etc., by the PCM data path connecting means, the contents of the instruction register Determines the operation of the signal processing means, starts or stops the operation of the function, and simultaneously operates a plurality of signal processing means to add the output data of the plurality of signal processing means to the PCM data path connection means. Acts to combine in the part.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. 1, and (Table 3) and (Table 4). FIG.
1 is a block diagram showing the internal configuration of a digital telephone according to one embodiment of the present invention, and (Table 3) and (Table 4) show a control method of the digital telephone according to one embodiment of the present invention.

[0013]

[Table 3]

[0014]

[Table 4]

In FIG. 1, the main control unit 20 includes a control bus 2
1, the signal processing means 22 to 24, the A1 control register 25, the A2 control register 26, and the B control register 27 are controlled. The first PCM data path connection means 28, the second
PCM data path connection means 29 and analog switch section 30 are controlled by A1 control register 25, A2 control register 26, and B control register 27 according to the contents shown in (a) to (d) of (Table 3). . A digital line interface unit 31 and a PCM codec 3
2. Analog switch section 30, amplifiers 33 to 36, receiver 37, speaker for loudspeaker 38, microphone for loudspeaker 3
9 has the same function as the conventional example of FIG.

The signal processing units 22 to 24 are composed of signal processing units 40 to 42, instruction registers 43 to 45, and status registers 46 to 48, respectively.

The signal processing section is realized by a microprocessor, a digital signal processor, or the like, so that common hardware is used, and the signal processing function is realized by software.

As a common signal processing procedure, the signal processing means inputs a digital voice band signal from the input line indicated by UPi to the private branch exchange, and then outputs the signal to the UPo line. Similarly, after inputting a digital voice band signal from the private branch exchange through an input line indicated by DOWNi,
Output to the WNo line. At this time, for example, when the signal processing means has a loudspeaker function, the voice band signal is processed by an algorithm such as an echo canceller of the signal processing unit. The transmission gain in the UPo line direction and the reception gain in the DOWNo line direction are controlled by respective signal processing means by an instruction register.

The instruction register is for the main control unit to notify an operation instruction corresponding to the signal processing function of the signal processing unit of each signal processing unit. One example is shown in Table 4.
(G) to (k).

The status register is a register for allowing the main control unit to recognize the presence / absence of hardware of the signal processing means, the operation state, and the contents of the signal processing function. I do. One example is shown in (e) and (f) of Table 3.

The first PCM data path connecting means 28 comprises:
The PCM data exchange unit 49 converts the 8-bit compressed PCM data from the digital line interface unit 31 into the original 16-bit uncompressed linear data, and then distributes the converted data to the signal processing units 22 to 24. . Also, the linear data from each signal processing means is stored in a switch 51.
Are input to the addition processing unit 50 through .about.53 and are subjected to addition processing. Thereafter, the data is converted into PCM data by the PCM data converter 49 and sent to the digital line interface 31.

The second PCM data path connecting means 29 comprises:
The PCM data converter 54 converts the PCM data from the PCM codec 32 into linear data, and then distributes the linear data to the signal processing units 22 to 24. The linear data from each signal processing unit is input to the addition processing unit 55 via the switches 56 to 58, and is subjected to addition processing. Then PCM
The data is converted into PCM data by the data
It is sent to the codec 32.

The switches 51 to 53 and 56 to 58 of the first and second PCM data path connection means are provided with hardware for each signal processing means, and when the function is necessary, when the hardware is in an operable state. Is turned on, and turned off if unnecessary. At this time, by turning on a plurality of switches, output data from a plurality of signal processing means can be added.

Next, a method in which the main control unit 20 configures necessary functions when the power of the digital telephone is turned on will be described. Here, it is assumed that the signal processing units 22 to 24 are equipped with a DTMF signal output function, a ringtone output function, a loudspeaker function, and a normal telephone function, respectively.

First, the main controller 20 reads the contents of the status register 46 of the signal processing means 22. At this time, assuming that the signal processing unit 40 is in an operable state, (00000000) is set in the status register 46, so that the main control unit 20 recognizes this as a DTMF signal output function (( (E) and (f) in Table 3). Similarly, it recognizes that the signal processing means 23 has a ringtone output function and the signal processing means 24 has a loudspeaker function and a normal telephone function.

A signal processing means having a necessary function is selected from all the signal processing means mounted by the above-described method according to the situation, and the A1 control register 25 and A2
By controlling the control register 26, the switches 51 to 53 and the second PCM of the first PCM data path connecting means 28 are controlled.
By changing the switches 56 to 58 of the data path connection means 29, the signal processing route of the PCM data path is determined.

For example, to establish a normal call state,
By setting (01101101) in the command register 45 of the signal processing means 24, the normal communication state with a transmission / reception gain of 0 dB is set, (00000001) is set in the A1 control register 25, (00000001) is set in the A2 control register 26, and the switch 53 is set. , 5
8 is turned on ((a) and (b) in (Table 3) and (i), (j) and (k) in (Table 4)).

Next, an example in which a busy ring tone is transmitted when an incoming call occurs in this state will be described. To enable the output of the signal processing means 23 having a ringtone output function,
First, (00000011) is set in the A2 control register 26, and the switch 57 is turned on in addition to the normal call state.
Then, by setting (00001101) in the command register 44, a busy ringtone with a reception gain of 0 dB is transmitted.
Therefore, the call data from the signal processing unit 24 and the ring tone from the signal processing unit 23 are added by the addition processing unit 55 and output from the speaker of the receiver 37.

As described above, according to the present embodiment, the PCM data path connection means to which a plurality of signal processing means can be connected is provided in advance, so that it is possible to add or expand functions without changing hardware. it can.

Although the above description has been made of the case where the number of signal processing means is three, the number of connectable signal processing means can be increased in accordance with the number of internal switches of the first and second PCM data path connection means. . Further, by supplying the signal processing means to the user with an IC card, the functions required by the user can be easily extended. It is clear that the digital circuit for realizing the present invention can be integrated on one silicon chip and miniaturized.

[0031]

As is clear from the above embodiments, according to the present invention, a PCM data path connection means capable of connecting a plurality of signal processing means is provided in advance, so that the addition and expansion of the function is performed by the signal processing means. This can be handled by implementing additional means. Therefore, it is possible to add and change functions without significantly changing hardware, and to prepare a PCM data path connection unit having a plurality of signal processing units and a plurality of inputs and outputs in advance. When the hardware function is to be enhanced after the product is completed, a digital telephone can be provided that can be handled only by changing the control software.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the internal configuration of a digital telephone according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the internal configuration of a conventional digital telephone.

[Explanation of symbols]

 Reference Signs List 20 main control unit 28 first PCM data path connection means 29 second PCM data path connection means

Claims (2)

(57) [Claims] A first input / output section and a second input / output section, wherein a signal input to the first input / output section is processed and output to the second input / output section; A plurality of signals which are processed by processing signals input to the second input / output unit and output to the first input / output unit
And the outputs of the first input / output units of the plurality of signal processing means are arbitrarily added and connected to output as a first common output signal, while the first common input signal is the plurality of signal processing means. The first PCM data path control means for distributing as an input signal of the first input / output unit of the processing means and the outputs of the plurality of second input / output units of the plurality of signal processing means are arbitrarily added and connected, while output as the common output signal, the second common input signal, said plurality
A second PCM data path control means for distributing as an input signal to a second input / output unit of the signal processing means , wherein the first PCM data path connection means and the second PCM data path control means are provided.
Between the data path connecting means and the plurality of signal processing means.
A first PCM data path control means and a second PCM data path control means.
Select each signal processing means by CM data path control means
Digital telephone made possible . Wherein the signal processing means computes processed therein
2. The signal generated as described above is output to only the first input / output unit or the second input / output unit.
Digital telephone as described.