JPH07120967B2 - Audio information transmission device - Google Patents

Description

The present invention relates to a device for transmitting voice information in mobile communication.

[Conventional technology]

Conventionally, when voice information is transmitted by mobile communication, a call is performed for a long time of about 3 to 5 minutes at maximum, as seen in personal radio and the like. Moreover, if a call is made by repeating transmission and reception between two specific parties, a situation in which it is difficult for another user to use occurs.

[Problems to be solved by the invention]

On the other hand, there is a lot of very important information in the voice information, though it is extremely short. For example, it may be an emergency call, communication of the place and time at that time, or confirmation of survival. Although these pieces of information are required in a short time, when used in the same frequency band as other long calls, the transmission efficiency may be very poor.

[Means for solving problems]

In order to solve such a problem, the present invention provides a coding means for coding an analog audio signal into a digital signal, and a transmission storage means for storing an output of the coding means for a time period during which a write clock is input. , A transmission storage control unit that outputs a write clock for a certain short time in conjunction with a voice input switch, and a wireless transmission rate that is slower than the rate at which the contents stored in the transmission storage unit are encoded by the encoding unit. A transmitting means for transmitting, a receiving means for receiving a result wirelessly transmitted by the transmitting means, a notifying means for notifying that the result has been received by the receiving means, a receiving storage means for storing an output of the receiving means, and a receiving storage means. And a decoding means for decoding the signal output from the reception storage means and outputting it as analog voice. One in which the.

[Action]

In the present invention, the analog voice information is converted into digital voice information, which is stored in the transmission storage means and transmitted for a short time of, for example, about 5 to 10 seconds.

〔Example〕

An embodiment of a voice information transmitting apparatus according to the present invention is shown in FIG.
It is shown in FIG. FIG. 1 shows a transmitter and FIG. 2 shows a receiver. The voice input from the microphone 1 is output as a voice signal a, encoded by the encoder 2 as an encoding means, and converted into a digital voice signal. The digital voice signal b output from the encoder 2 is stored in the memory 4 as a transmission storage means for a short time Ts after the voice input switch 3 is turned on. The time Ts used is about 5 to 10 seconds.

The clock transmission circuit 5 and the clock generation circuit 8 constitute a transmission storage control means. The clock transmission circuit 5 is a circuit that generates a write clock CL1 for the memory 4, and is composed of a timer 6 and an AND gate 7. The operation of the clock transmission circuit 5 will be described. When the voice input switch 3 is turned on, the output of the Ts time timer 6 starts from that point. While the timer 6 is running, the AND gate 7 is opened to allow the output signal CL0 of the clock generation circuit 8 to pass and to output the clock CL1 for writing to the memory 4. Further, while the output of the timer 6 is rising, the voice input display section 9 lights up to inform the user that the memory 4 is being stored.

Next, a method of confirming the contents stored in the memory 4 will be described. When the confirmation switch 10 is turned on, the output of the timer 11 rises. The rising time of the timer 11 is selected to be the same value as the timer 6. While the output of the timer 11 is rising, the switch 12 is turned on and the contents of the memory 4 are read by the decoder 13
Send to. The contents of the sent memory 4 are
It is converted into an analog voice signal in 13 and sent out as voice from the speaker 14. The read clock CL2 for the memory 4 for this transmission is supplied by selecting the switch circuit 15 to pass the output signal CL0 of the clock generation circuit while the output of the timer 11 is rising. Further, while the output of the timer 11 is rising, the confirmation display section 16 lights up to inform the user that the contents of the memory 4 are being confirmed.

The output signal e of the memory 4 is combined with the identification signal d output from the identification signal generating section 17 in the combining section 18 and wirelessly transmitted by the transmitter 19 as a transmitting means.

Next, the transmission control of the transmitter 19 will be described. When the transmission switch 20 is turned on, the output of the timer 24 rises through the OR gate 23 for the time Tt when there is no response output from the transmission limiting circuit including the timer 21 and the delay circuit 22. When the output of timer 24 is rising Tt time AND gate 25 opens,
The output of the clock generation circuit 27 is passed and the switch circuit 15
The read clock CL2 is supplied to the memory 4 through the. The switch circuit 15 selects the output signal c of the AND gate 25 while the confirmation switch 10 is not turned on, that is, while the timer 11 is not operating. An identification signal d is sent from the identification signal generator 17 with respect to the rising of the timer 24, and is combined with the output signal e of the memory 4 by the combiner 18. As a result of the combination, the content of the memory 4 continues after the identification signal. While the timer 24 is running, the transmitter 19 wirelessly transmits the output signal f of the combining unit 18. During this time, the transmission display unit 26 lights up to inform the user that the identification signal and the voice information in the memory 4 are being wirelessly transmitted. In this case, the wireless switch 19 is continuously activated by repeatedly turning on and off the transmission switch 20, so that only a specific user occupies the wireless line. In order to prevent this, a transmission limiting circuit including a timer 21 and a delay circuit 22 is used.

Next, the operation of this transmission limiting circuit will be described. When the transmission switch 20 is turned on for the first time, the delay circuit 22 delays even if the timer 21 responds, so the response signal is not output from the delay circuit 22 and the transmission switch is transmitted through the OR gate 23.
The rising edge of 20 is input to the timer 24. However, when the output signal g of the delay circuit 22 rises because the output of the timer 21 rises for a certain time Ta, the OR gate 23 does not respond during the Ta time even if the transmission switch 20 is turned on.
Therefore, the input to the timer 24 remains disconnected. That is, it is necessary to wait Ta time before the second transmission is turned on and transmission is performed.

Since this transmission limiting circuit is provided in the transmission device, it is possible to prevent only a specific person from occupying the wireless section, and it is likely that only highly urgent and valuable audio information will be selected. The utility value of is extremely high.

Next, the receiver shown in FIG. 2 will be described. The signal received by the receiver 31 as the receiving means is input to the memory 32 as the receiving storage means.

Clock CL3 for writing data to this memory 32
The generation operation of will be described. First, the identification signal determination circuit 33
When it is determined that the output of the receiver 31 and the content of the identification signal storage unit 34 match, that is, when the identification signal included in the received signal and the identification signal of the identification signal storage unit 34 match,
The notification signal is output to raise the output of the timer 35 and the AND gate 36 is opened. During this time, the output of the clock generation circuit 37 is AN
It becomes the write clock CL3 through the D gate 36 and the memory
Run 32. In this case, the clock generation circuit 37 is used in synchronization with the output of the receiver 31 so that the input to the memory 32 can be performed normally.

When the identification signal is received, the set / reset circuit 38 is set by using the determination result of the identification signal determination circuit 33, the reception display section 39 as a notification means is turned on, and the reception device transmits a voice signal to the user. Notify that it has been received.

Next, the output operation of the contents stored in the memory 32 will be described. This operation is mainly performed by the timer 41, the AND gate 42, and the clock generation circuit 46 which constitute the control means. When the voice output switch 40 is turned on, the output of the timer 41 rises. While the output of the timer 41 is rising, the AND gate 42 opens to pass the output of the clock generation circuit 46
The clock CL4 is output from the gate 42. The content of the memory 32 is output by this read clock CL4, converted into an analog voice signal by a decoder 43 as a decoding means, and sent out as a voice from a speaker 44. On the other hand, while the output of the timer 41 is rising, the voice output display section 45
Lights up to inform the user that the audio signal is being output, the set / reset circuit 38 is cleared, and the reception display section 39 is turned off. Since the content of the memory generally does not change depending on the read clock, the content received and stored in the memory 32 is output many times each time the voice switch 40 is turned on and can be heard as voice.

Since the receiving device has such a function, even if it is received when there is no user, it is stored and remains, so that it can be repeatedly reproduced later. Therefore, since the received contents can be listened to again and again, the voice information is surely transmitted without being overheard.

Next, the relationship of each clock will be described. The clock CL1 and the clock CL4 have the same frequency, and the clock CL2 and the clock CL3 also have the same frequency. The relational expression of each clock is as follows.

CL1 = CL4 CL2 = CL3 CL2 = CL1 / K The value of K is determined by the radio used. For example,
When ADM (adaptive delta modulation) with a coding rate of 16 kbps is used as CODER2, the available transmission speed is
K = 5 when only low speed of 3.2kbps can be handled
You can choose If the transmission speed is 3.2 kbps, the transmission time is required to be 5 times as long as Tt = Ts, but it is sufficiently covered by the transmission frequency band of the FM radio that transmits normal voice in analog, and it is dedicated for digital signal transmission. No need to use a special radio. Further, even if the coding speed is increased and the voice quality is sufficiently improved, it is possible to transmit without expanding the frequency band by selecting K sufficiently large. Therefore, from the past 25kHz
It is suitable for transmitting voice information in mobile communication because it coexists with analog systems used at frequency intervals and is suitable for low current and miniaturization.

The above is the description of the apparatus shown in the drawing. For receivers,
After the identification signal determination circuit 33 determines the identification signal, its output is input to the timer 35 and the set / reset circuit 38. Instead, the receiver 31 determines whether or not there is a received electric field and squelch. This squelch signal may be input to the timer 35 and the set / reset circuit 38 by using a device that outputs a signal. In this way, all transmissions from unspecified users are received, but the identification signal determination circuit 33 and the identification signal storage unit 34 are unnecessary, and there is a small size and economical advantage.

Next, a method of using the device shown in the figure will be described. In the transmitter, the user first turns on the voice input switch 3 to input voice from the mask 1 in a short time. Next, when the confirmation switch 10 is turned on and the input voice content is confirmed, the transmission switch 20 is turned on.

In the receiving device, when a signal is received, the lamp of the reception display section 39 lights up. Then, when the voice output switch 40 is turned on, the received voice signal is output from the speaker 44.

〔The invention's effect〕

As described above, according to the present invention, the encoding means for encoding an analog audio signal into a digital signal, the transmission storage means for storing the output of a certain fixed time encoding means, and the contents stored in this transmission storage means Transmitting means for wirelessly transmitting,
The receiving means for receiving the result wirelessly transmitted by the transmitting means, the notifying means for notifying the reception by the receiving means, the receiving storage means for storing the output of the receiving means, and the output of the contents of the receiving storage means are controlled. By providing the control means and the decoding means for decoding the signal output from the reception storage means and outputting it as analog voice, the analog voice information is converted into digital voice information and stored in the memory for an extremely short time and transmitted. Therefore, the usage time per person can be shortened, which has the effect of improving the usage efficiency of the wireless line. That is, since long information and short information are not mixed and only short information is handled, a large number of people can use it, which is suitable for effective frequency use. Also, by wirelessly transmitting at a transmission rate lower than the rate encoded by the encoding means, it is not necessary to use a special radio device, and transmission can be performed without widening the frequency band. Suitable for coexistence and miniaturization,
It is suitable for transmitting voice information in mobile communication.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of a transmitting apparatus which constitutes a voice information transmitting apparatus according to the present invention, and FIG. 2 is an embodiment of a receiving apparatus which also constitutes this apparatus. It is a circuit diagram shown. 1 ... Microphone, 2 ... Encoder, 3 ... Voice input switch, 4,32 ... Memory, 5 ... Clock sending circuit, 6,11,2
1,24,35,41 …… Timer, 7,25,36,42 …… AND gate, 8,2
7,37,46 …… Clock generator, 9 …… Voice input display, 10 …… Confirmation switch, 12 …… Switch, 13,43 ……
Decoder, 14,44 ... Speaker, 15 ... Switch circuit, 16
…… Confirmation display section, 17 …… Identification signal generation section, 18 …… Synthesis section, 19 …… Transmitter, 20 …… Transmission switch, 22 …… Delay circuit, 23 …… OR gate, 26 …… Sending display section , 31 ... receiver, 33 ... identification signal judgment circuit, 34 ... identification signal storage section,
38 ... Set / reset circuit, 39 ... Reception display, 40 ...
… Voice output switch, 45 …… Voice output display section.

Claims (4)

[Claims] 1. A coding means for coding an analog voice signal into a digital signal, a transmission storage means for storing the output of the coding means for the time when a write clock is input, and a voice input switch. Transmission storage control means for outputting the write clock for a certain short time, and transmission means for wirelessly transmitting the content stored in the transmission storage means at a transmission speed slower than the encoding speed in the encoding means, The receiving means for receiving the result wirelessly transmitted by the transmitting means, the notifying means for notifying the reception by the receiving means, the receiving and storing means for storing the output of the receiving means, and the voice output switch are operated in conjunction with each other. Control means for controlling the contents of the reception storage means to be output, and decoding the signal output from the reception storage means and outputting as analog voice Voice communication device characterized by comprising a decoding means that. 2. The transmission storage means operates in conjunction with a confirmation switch for a fixed short time, and has a function of confirming by converting the stored contents into an analog voice signal and outputting the analog voice signal. The voice information transmitting device according to claim 1. 3. The voice information transmitting apparatus according to claim 1, wherein the transmitting means cannot perform wireless transmission for a fixed time after the transmission switch is turned on to perform wireless transmission. 4. The notifying means, when it judges that the identification signal included in the output of the receiving means is appropriate, notifies the reception and outputs a notification signal for causing the reception storing means to start the storing operation. The audio information transmission device according to claim 1, wherein