JP3247789B2 - Wireless intercom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication apparatus for transmitting a data signal together with a voice signal for identification of a communication partner.

[0002]

2. Description of the Related Art In a radio communication device used for a taxi or the like, one frequency may be shared by a plurality of carriers, and a method called tone squelch is used to avoid interference with other carriers. . Also, within each company, together with the audio signal, the vehicle number information indicating the vehicle number of the taxi on the transmitting side or the vehicle number of the taxi of the destination to which the base station wants to make a call, the actual or empty vehicle information indicating the presence or absence of a passenger, A data signal represented by binary values of 0 and 1 relating to area information indicating an area where the vehicle exists is transmitted. The transmission of the data signal is a so-called minimum shift keying in which, when data representing 0 is to be transmitted, for example, a signal of 1200 Hz is transmitted by half-wave, and when data representing 1 is to be transmitted, for example, full-wave transmission is 2400 Hz. (Hereinafter abbreviated as MSK).

FIG. 5 is a timing chart for explaining a conventional communication procedure. In a wireless communication device having relatively few data signals, in one transmission, FIG.
When the transmission is started and the carrier is transmitted as shown in (1), first, as shown in FIG. 5 (2), the aforementioned data signal D4 is transmitted, and the predetermined short time W1,
For example, after a lapse of 10 msec, the audio signal is transmitted. In the wireless communication device as described above, the data signal D
4 is transmitted by a modem built in or external to a transmitter and a receiver provided in the wireless communication device, and further processed by a processing unit such as a microcomputer. The data signal D4 received on the receiving side is The sound is also output to the speaker and converted into an acoustic sound, which is very unpleasant.

[0004] One of the prior arts is a mute circuit interposed in a signal line from a receiver to a speaker.
When the processing unit determines that the data signal D4 is received when the modem receives the bit synchronization signal D1 and the frame synchronization signal D2 among the data signals D4 as shown in FIGS. 5 (2) and 5 (3). As shown in FIG. 5 (4), the mute circuit is switched from the release state to the cutoff state to mute the output of the received signal to the speaker, the data signal body D3 ends, and the transmitted vehicle number and A method is used in which the mute is released when the number of the own vehicle stored in the processing unit matches.

However, this method can mute
Only the data signal body D3 is present, and the parts of the bit synchronization signal D1 and the frame synchronization signal D2 are still output to the loudspeaker and sounded.

FIG. 6 is a timing chart for explaining another conventional communication procedure. As a measure for improving the above-described conventional technology, a method using the tone squelch has been proposed as another conventional technology. Tone squelch means that the frequency range of 0 to 300 Hz is divided into 33 tone signals for the purpose of recognizing a business operator and allocated to each taxi company, and the tone signal of the assigned frequency is superimposed on the audio signal. This is a transmission method in which a tone circuit connected to a transmitter superimposes a tone signal on an audio signal.

In the method using the tone squelch, transmission of the tone signal shown in FIG. 6A is started a short time W1 after transmission of the data signal D4 is completed, as shown in FIG. 6B. Is done. When the tone signal is received, a frequency counter connected to the receiver counts the frequency of the tone signal, and repeatedly outputs frequency information to the processing unit while the tone signal is being received. In response to this, the processing unit determines whether the frequency of the received tone signal matches its own frequency stored in advance and the processing unit performs the output from the frequency counter as shown in FIG. The mute operation is released as shown by, and an audio signal can be output to the speaker.

[0008]

In the prior art using the above-described tone squelch, after the tone signal is actually received, the frequency is counted by the frequency counter and the mute is released by the processing unit. In relation to the frequency of the tone signal, there is a relatively large response delay of the identification time W2, for example, 200 msec. Further, the response delay has a variation corresponding to the frequency of the tone signal. For this reason, the release of the mute is delayed and the leading part of the voice is lost, which may hinder the call. To solve such a problem, FIG.
If the superimposition is started at the same time as the start of transmission of the data signal D4 as indicated by the two-dot chain line, the mute is released too early to completely mute the data signal D4, and the data signal D4 leaks from the speaker and is annoying. Sometimes it happens. Furthermore, if the wireless communication device used does not have a tone squelch function, such a method cannot be used.

An object of the present invention is to provide a radio communication apparatus capable of completely muting a data signal transmitted at the same frequency as a voice signal.

[0010]

According to the present invention, (a) the data signal D8 and the audio signal are transmitted from the transmitting side for a very short time W1.
2, the identification tone signal having the predetermined frequency domain in this order is superimposed on the data signal D8 and the audio signal, and the carrier C is modulated and transmitted. The data signal D8 is synchronized with the synchronization signal D5. , D6 and a data signal body D7 representing the identification number of the receiving side are transmitted in this order, and the tone signal is transmitted before the reception end time t6 of the data signal D8. (B) On the receiving side, (b1) receiving and demodulating means 2, 3, and 4 for receiving and demodulating carrier C from the transmitting side; and (b2) responding to the output of receiving and demodulating means 2, 3, and 4, (B3) a predetermined delay time W from the first time t1 at which the carrier C is detected in response to the output of the carrier detection circuit 10;
The delay signal N2 is derived at a second time t4 after the elapse of thirteen, and the delay time W13 is set so that the delay time W13 is between the reception start time t3 and the reception end time t6 of the data signal body D7. (B4) a register for storing predetermined identification information and predetermined frequency information; and (b5) receiving by the reception demodulation means 2, 3, 4 in response to the reception demodulation means 2, 3, 4 and the output of the register. In synchronization with the synchronized signals D5 and D6, the information representing the data signal body D7 is read, the information represented by the data signal body D7 matches the identification information stored in the register, and the frequency information of the tone signal is stored in the register. (B6) a delay signal N2 from the delay means 15 when the frequency information matches the frequency information stored in the delay means 15; When the identification signal ID is obtained from the different means 23, the sound signal control means 6, 7, 8 and 9 for sounding the audio signals from the receiving and demodulating means 2, 3 and 4 are included. It is a wireless communication device.

Further, the present invention is characterized in that the identification means and the delay means are provided with a microcomputer, and the delay time is determined by software processing in accordance with the format of the data signal.

[0012]

According to the present invention, in a radio communication apparatus used for taxi radio or the like, a transmitting side transmits synchronization signals D5 and D6 for a data signal body D7 and a telephone call prior to a voice signal to be transmitted. The data signal main body D7 representing the identification number of the receiving side to be transmitted is transmitted. On the receiving side, the identification number is received after the synchronization signal is received by the identification means.
Until it matches the identification number of the receiving side, the audio signal is blocked by mute means, and when the synchronization signal is not detected and when the identification number matches, the audio signal can be made acoustic by a speaker or the like. . In particular, in the present invention,
The identification tone signal is superimposed on the data signal D8 and the voice signal, and the identification signal ID is derived from the identification means 23 at the reception end time t6. Therefore, the identification of the data signal D8 and the identification of the tone signal are performed in time. Since the operation is not performed sequentially, the operation by the sound control signals 6, 7, 8, and 9 is quickly performed, and the sound signal is started to be sounded as quickly as possible after receiving the carrier C from the communication side. can do.

According to the present invention, the sound control means 6,
The operation of the sound control of 7, 8, and 9 is performed by both the delay signal N2 that delays the detection of the carrier C and the identification signal ID. Therefore, the operation of the sound control can be accurately performed, and the noise control can be performed accurately. It is possible to prevent erroneous operation due to the above.

Further, according to the present invention, the data signal D8 and the audio signal from the transmitting side are transmitted by modulating the carrier C with a short time W12, and the delay time W13 of the delay signal M2 by the delay means 15 is Is set to be between the reception start time t3 and the reception end time t6 of the data signal body D7. Therefore, even if there is some error in the delay time W13, the acoustic control means 6, 7, 8 , 9 are not likely to be mixed with noise or the like.

Preferably, in the above-mentioned wireless communication apparatus, the identification means and the delay means are provided with a microcomputer, and the delay time is determined by software processing in accordance with the format of the data signal. As a result, the delay time becomes variable, and it is possible to easily cope with a change in the data length.

[0016]

FIG. 1 is a block diagram showing an electric configuration of a radio communication device 1 for a taxi according to an embodiment of the present invention. FIG. 2 is a timing chart for explaining a communication procedure of the radio communication device 1. It is a chart. In the wireless communication device 1, when the press talk switch PT is pressed, the press talk switch PT is switched to the transmitter 26 side, and the CPU 2 realized by the transmitter 26 and a microcomputer or the like.
3 in conjunction with the data stored in advance in the register provided in the CPU 23, the data stored in the modem provided in the transmitter 26 before the voice is transmitted.
The signal is converted by the K method, further modulated by a modulation circuit provided inside the transmitter 26, output to the antenna 2, and transmitted.

The data includes vehicle number information indicating the vehicle number of the own vehicle on which the operator is riding or the vehicle number of the vehicle to which the operator intends to transmit, and an area indicating the area where the vehicle exists. The information includes information on the actual vehicle or the empty vehicle indicating presence or absence of a passenger. Here, when the transmitting side or the receiving side is a base station, the vehicle number information may include information indicating that the vehicle side is a base station. The vehicle number information and the area information are transmitted to the CPU 2 by the operation of the ten keys 29 by the operator.
3 and the actual or empty vehicle information is input from a toll meter 30 connected to the CPU 23. The area information may include information indicating an area of a destination that an operator aims at. The information such as the vehicle number information input in this way is stored in a register provided inside the CPU 23 and is also displayed on the display unit 28.

When the transmission of the data is completed, the voice can be transmitted after a predetermined short time W12, for example, 10 msec.
Is modulated by the transmitter 26, output to the antenna 2, and transmitted. In the audio signal, a frequency range of 0 to 300 Hz is divided into, for example, 33 waves, and tone signals individually assigned to each taxi company are superimposed and transmitted. When the transmission is completed and the pressing operation of the press talk switch PT is released, the press talk switch PT is switched to the front end circuit 3 side and enters a reception waiting state.

In response, on the receiving side, in one receiving operation, when carrier C is received at time t1 and the receiving operation is started as shown in FIG.
As shown in (6), the minute time W11, for example, 15
The data signal D8 transmitted from time t2 after 0 msec is identified. The data signal D8 includes a data signal body D7 including information on the vehicle number and the like,
It comprises a bit synchronization signal D5 and a frame synchronization signal D6. When the reception of the data signal D8 ends at time t6,
The reception of the audio signal is performed from time t7 after the minute time W12, and the reception of the audio signal is completed at time t8, 1
The receiving operation is ended.

The received signal received by the antenna 2 is input to the demodulation circuit 4 via the pre-talk switch PT and the front-end circuit 3, and is demodulated into a voice signal and a data signal D8. Through a switch 6 and an amplifier 7 as means,
The sound is output to the speaker 8 and converted to sound. Here, the switch 6 is for preventing the output of a signal other than the audio signal to the amplifier 7, is output from a logic element 9 described later, and is controlled by a mute signal M shown in FIG. .

The signal component of the carrier C is extracted by the high-pass filter 11 of the carrier detection circuit 10, and further extracted by the amplifier 12, the diode 13, and the reference voltage source 14a.
2 through a comparator 14 to which a reference voltage of, for example, 5 V is applied, and becomes a noise squelch signal N1 as shown in FIG.
That is, when the carrier C is received, the noise squelch signal N1 changes from a low level to a high level.

The noise squelch signal N1 input to the delay circuit 15 is input to an RC integration circuit 18 including a resistor 16 and a capacitor 17, and as shown in FIG. It rises. When the terminal voltage V reaches a reference voltage from the reference voltage source 19a applied to the comparator 19, for example, 5 V, the noise squelch signal N1 is delayed by a delay time W13 required for charging, for example, 300 msec. 2 (4), the noise squelch signal N
2 is output to the logic element 9 at time t4. That is, the noise squelch signal N2 changes from the low level to the high level after a delay time W13 after the noise squelch signal N1 changes from the low level to the high level.

Here, the delay time W13 is adjusted by appropriately selecting the resistor 16 and the capacitor 17, and the time t4 when the noise squelch signal N2 is output to the logic element 9 is determined by the reception of the data signal body D7. It is set to be between the start time t3 and the reception end time t6. In the present embodiment, the time t4 is set to be a very short time W14, for example, 50 msec, from the reception end time t3 of the frame synchronization signal D6.

When the reception of the audio signal ends at time t8 and the carrier C is cut off, the noise squelch signal N1 output from the carrier detection circuit 10 changes from the high level to the low level as shown in FIG. Becomes Thereby, as shown in FIG. 2C, the terminal voltage V of the capacitor 17 of the RC integration circuit 18 is grounded via the diode 20 in which the capacitor 17 is connected in parallel with the resistor 16 and via the comparator 19. By doing so, it becomes 0. Therefore, the noise squelch signal N2 output from the delay circuit 15 to the logic element 9 also changes from the high level to the low level.

When reception of the data signal D8 is started at time t2, the data signal D8 is input to the modem 22 via the waveform shaping circuit 21 and is converted into a digital signal.
The information is input to the PU 23 and the information on the vehicle number and the like is identified. The tone signal superimposed on the audio signal is input to the frequency counter 25 via the low-pass filter 24, and the frequency is counted. The frequency information DT of the tone signal thus counted is repeatedly output from time t5 to time t8 when the frequency counting is completed, as shown in FIG.
23 performs frequency collation.

Here, there is a response delay between the reception of the tone signal and the counting of the frequency by the frequency counter 25, and the response delay has a variation corresponding to the frequency of the tone signal. ,
The superimposition of the tone signal is performed by the frequency information D to the CPU 23.
The time t5 at which the output of T is performed is performed before the transmission end time t6 of the data signal D8, and thus the tone signal is superimposed on the data signal D8 and the audio signal.

The data signal D8 and the frequency information DT
At time t3 when the input of the bit synchronization signal D5 of the data signal D8 and the input of the frame synchronization signal D6 are completed, the CPU 23 sets the identification signal ID to be output to the logic element 9 as shown in FIG. Switch from level to high level. Further, the CPU 23 inputs all the data signal body D7, reads information on the vehicle number and the like, matches the identification information which is the vehicle number of the own vehicle stored in advance in the register, and inputs the information at time t5. When the frequency information of the tone signal to be matched with the frequency information stored in the register in advance, the identification signal ID is switched from high level to low level at time t6.

On the other hand, the logic element 9 outputs a mute signal M as shown in FIG. 2 (8) in response to the tone squelch signal N2 and the identification signal ID, and controls the switch 6. Before reception starts at time t1,
The tone squelch signal N2 and the identification signal ID are both at a low level, so that the mute signal M output from the logic element 9 is at a high level, the switch 6 is shut off, and noise not related to a call to the speaker 8 is generated. Output is blocked.

Next, when reception of the data signal body D7 of the data signal D8 is started at time t3, the identification signal ID becomes high level, and at time t4 after the minute time W14,
The noise squelch signal N2 becomes high level. further,
In the CPU 23, the vehicle number and the frequency of the tone signal are collated, and if both match the values stored in advance, the identification signal ID becomes low level at time t6, and the mute signal M Becomes low level, the switch 6 is turned on, and in other cases, the identification signal ID remains at high level. Therefore, the audio signal received from time t7 is output to speaker 8 only on the receiving side designated by the transmitting side and is converted into an acoustic signal. A minute time W12 exists between the data signal D8 from the transmitting side and the audio signal, and the delay time W13 of the delay signal N2 is
The data signal body D7 is set so as to be between the reception start time t3 and the reception end time t6, and the identification signal ID from the identification means 23 is generated at the reception end time t6, and the delay time W13 and the identification signal Even if an error occurs in the time at which the ID is derived, it is possible to reliably prevent noise and the like from being mixed into the audio signal acousticized from the acoustic control signals 6, 7, 8, and 9.

When the reception of the audio signal ends at time t8,
The noise squelch signal N2 switches from the high level to the low level, the mute signal M switches from the low level to the high level, the switch 6 is cut off, and the output of noise or the like unrelated to the call to the speaker 8 is output. Is blocked.

As described above, according to the wireless communication device 1 of the present embodiment, in one receiving operation, when the carrier C is received, the noise squelch signal from the carrier detecting circuit 10 rises from a low level to a high level when the carrier C is received. N1 is CPU2
3, since the delay by the delay circuit 15 is started until the reading of the data signal body D7 is started, the bit period signal D5 and the frame synchronization signal D6 included in the data signal D8 can be reliably muted. Further, only when the reading of the data signal body D7 is completed in the CPU 23 and it is confirmed that the signal is a transmission signal to the own vehicle, the shut-off operation of the switch 6 is released, and the audio signal is audibly converted by the speaker 8. When the reception of the audio signal is completed, the switch 6 is turned off again. Therefore, the data signal D8 received prior to the audio signal,
In addition, it is possible to prevent the transmission signal to the speaker 8 from being output to a speaker other than the own vehicle.

FIG. 3 is a block diagram showing an electrical configuration of a radio communication device 1a for a taxi according to another embodiment of the present invention, and FIG. 4 explains a processing operation of a CPU 31 provided in the radio communication device 1a. It is a flowchart for the. Note that, in FIG. 3, similar parts to those in FIG. 1 are denoted by the same reference numerals. It should be noted that the delay time W13 is determined by software processing in the CPU 31 in the wireless communication device 1a of the present embodiment.

At step a1, it is determined whether or not the noise squelch signal N1 has changed. For example, if the noise squelch signal N1 changes from low level to high level after reception is started, the process proceeds to step a2, and the current switch 6 is turned on. It is determined whether or not the data signal D is converted into a digital signal by the modem 22. If the data signal D is converted to a digital signal by the modem 22, the process proceeds to step a3.
8, other processing such as reading of frequency information of the tone signal output from the frequency counter 25 and counting operation of the delay timer at a predetermined timing are performed. The delay time W13 by the delay timer is
The setting is made in accordance with the data format of the data signal D8. If the switch 6 is not turned off in step a2, the process proceeds to step a4, where the switch 6 is turned off, and then proceeds to step a10.

If it is determined in step a1 that the noise squelch signal N1 has not changed, the process proceeds to step a5, where it is determined whether the noise squelch signal N1 is at a high level, that is, whether reception is in progress. If the level is not the high level, the process proceeds to step a11, where the interruption of the switch 6 is continued and the process proceeds to step a10.

If it is determined in step a5 that the noise squelch signal N1 is at the high level, step a6
Then, it is determined whether or not the delay timer has expired. If the timer has expired, the process proceeds to step a7. If not, the process proceeds to step a11. In step a7, it is determined whether the data signal D8 is being received. If the data signal D8 is being received, the process proceeds to step a11. If the data signal D8 is not being received, that is, if the reception of the data signal D8 has been completed, the process proceeds to step a11. Proceed to a8.

In step a8, the vehicle number information read from the modem 22 matches the vehicle number information of the own vehicle stored in advance in the register, and the frequency information of the tone signal read from the frequency counter 25 matches the vehicle number information. It is determined whether or not the own frequency information stored in the register matches with the own frequency information, that is, whether or not the currently received signal is for the own vehicle. When the switch 6 is turned on, the audio signal can be output to the speaker 8, and the process proceeds to step a10.
In step a8, of the vehicle number information and the frequency information,
If at least one of them does not match, the process proceeds to step a11, where the switch 6 is kept off, the output of audio signals unrelated to the vehicle to the speaker 8 is blocked, and the process proceeds to step a10.

Starting with the above-mentioned step a1, step a1
The control of the switch 6 is performed by repeating a series of steps ending with 0 at all times. In summary, when the reception is started and the noise squelch signal N1 changes from the low level to the high level, the steps a1 to a
Then, it is determined whether or not the switch 6 is turned off. If the switch 6 is turned off, the delay timer is started in step a3.

The reception is continued, and the noise squelch signal N1
Remains at the high level, the process proceeds from step a1 to step a5, to step a6, and in a series of steps from step a6 to step a8, the delay timer ends, the reception of the data signal D8 ends, and Only when the received signal is for the own vehicle by comparing the vehicle number with the frequency of the tone signal, the process proceeds to step a9, where the switch 6 is turned on and the audio signal can be output to the speaker 8, and in other cases, Goes to step a11, and the switch 6 is kept off.

On the other hand, when the reception is completed and the noise squelch signal N1 changes from the high level to the low level, the process proceeds from step a1 to step a2, where it is determined whether or not the switch 6 is turned off. In this case, the switch 6 is turned off in step a4, so that output of noise from the speaker 8 that is not related to the call is prevented.
When the noise squelch signal N1 remains at the low level, that is, in the reception waiting state, step a
The process proceeds from step 1 to step a11 via step a5, and the switch 6 remains off.

Therefore, the wireless communication device 1 of the present embodiment
According to a, the output of the data signal D8 received prior to the audio signal and the reception signal for the vehicle other than the own vehicle to the speaker 8 is prevented, and only the audio signal for the own vehicle is output to the speaker 8 for acoustic conversion. be able to. Further, since the delay time W13 is determined by software processing by the CPU 31 according to the format of the data signal D8, it is easy to cope with a change in the format of the data signal D8, and versatility can be improved.

[0041]

As described above, according to the present invention, the identification tone signal is superimposed on the data signal D8 and the audio signal, and the identification signal ID is obtained at the reception end time t6.
3, the audio signal can be quickly converted to an acoustic signal after the transmission of the carrier C from the transmission side is started.
Further, according to the present invention, the minute time W12 is interposed between the data signal D8 and the audio signal, and the delay time W13 of the delay signal N2 is determined by the reception start time P of the data signal body D7.
3 to the reception end time t6, and the identification signal ID is derived by the identification means 23 at the reception end time t6.
Noise and the like can be more reliably prevented from being mixed into the audio signal to be acousticized by 7, 8, and 9. Thus, the output of the data signal body D8 and the synchronization signals D5 and D6 to the speaker can be completely prevented. Therefore, it is possible to make a good call without the synchronization signal and the data signal leaking from the speaker and without causing the beginning of the audio signal to be cut off.

Further, since the present invention does not require a tone squelch function in a radio communication device, it can be applied to a radio communication device without a tone squelch function.

Preferably, in the above-mentioned wireless communication apparatus, the identification means and the delay means are provided with a microcomputer, and the delay time is variably set in accordance with the format of a data signal containing information such as an identification number. Software processing is possible. Therefore, only the software needs to be changed in response to a change in the format of the data signal such as the data length, and the cost of parts and personnel can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a radio communication device for taxi 1 according to an embodiment of the present invention.

FIG. 2 is a timing chart for explaining a call procedure of the wireless communication device 1.

FIG. 3 is a block diagram showing an electrical configuration of a radio communication device for taxi 1a according to another embodiment of the present invention.

FIG. 4 is a flowchart illustrating a processing operation of a CPU 31 provided in the wireless communication device 1a.

FIG. 5 is a timing chart for explaining a conventional communication procedure.

FIG. 6 is a timing chart for explaining another conventional communication procedure.

[Explanation of symbols]

 1, 1a Wireless communication device 3 Front end circuit 4 Demodulation circuit 5 Band pass filter 6 Switch 9 Logic element 10 Carrier detection circuit 11 High pass filter 15 Delay circuit 18 RC integration circuit 22 Modem 23, 31 CPU 24 Low pass filter 25 Frequency counter 26 Transmission Machine 28 Display 29 Numeric keypad 30 Charge meter

Claims (2)

(57) [Claims] 1. (a) From a transmitting side, a data signal D8 and an audio signal are separated by a short time W12 in this order,
Further, an identification tone signal having a predetermined frequency domain is superimposed on the data signal D8 and the audio signal, and the carrier C is modulated and transmitted. The data signal D8 includes synchronization signals D5 and D6 and an identification number of the receiving side. And a data signal body D7 representing the data signal transmitted in this order. The tone signal is a reception end time t6 of the data signal D8.
(B) On the receiving side, (b1) receiving and demodulating means 2, 3, and 4 for receiving and demodulating carrier C from the transmitting side; and (b2) receiving and demodulating means 2, (B3) a predetermined delay time W1 from the first time t1 at which the carrier C is detected in response to the output of the carrier detection circuit 10;
The delay signal N2 is derived at a second time t4 after a lapse of thirteen, and the delay time W13 is set to be between the reception start time t3 and the reception end time t6 of the data signal body D7. (B4) a register for storing predetermined identification information and predetermined frequency information; and (b5) receiving by the reception demodulation means 2, 3, 4 in response to the reception demodulation means 2, 3, 4 and the output of the register. In synchronization with the synchronized signals D5 and D6, the information representing the data signal body D7 is read, the information represented by the data signal body D7 matches the identification information stored in the register, and the frequency information of the tone signal is stored in the register. When it matches the frequency information stored in
Identification means 2 for deriving identification signal ID at reception end time t6
And (b6) sound control for sounding the audio signals from the receiving and demodulating means 2, 3, and 4 when the delay signal N2 from the delay means 15 and the identification signal ID from the identification means 23 are obtained. A wireless communication device comprising: means 6, 7, 8, 9; 2. The radio according to claim 1, wherein said identification means and said delay means are provided with a microcomputer, and the delay time is determined by software processing corresponding to the format of said data signal. Intercom equipment.