JPS61274522A - Voice information transmission equipment - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of the same frequency band to lots of communications by coding important information in an analog voice signal in a short time and storing the result and sending the stored coded information. CONSTITUTION:A voice signal (a) from a microphone 1 of a transmitter is coded by a coder 2 and a digital voice signal (b) is stored in a memory 4 in a short time Ts after a voice input switch 15 is turned on. The time Ts is controlled by a clock CL1 se by a timer 6 of a clock sending circuit 15. The content of the memory 4 is confirmed by a decoder 13 by the operation of a confirmation switch 10 and a switch 12. A switch 15 is controlled by the operation of the confirming circuit and only the important information coded in the memory 4 is sent from a transmitter 19 to a receiver 31. The content of the receiver 31 is stored in a memory 32 by using a control means such as a timer 35 connected to an identification signal discrimination circuit 23 and a set/reset circuit 36 and decoded by a decoder 43.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for transmitting voice information in mobile communications.

[Conventional technology]

2. Description of the Related Art Conventionally, when voice information is transmitted by mobile communication, as seen in personal radios, calls are carried out for a long time, about 3 to 5 minutes at most. Furthermore, if a call is made between two specific parties by repeating transmission and reception, it becomes difficult for other users to use the phone.

[Problem that the invention seeks to solve]

On the other hand, voice information includes a large amount of very important information, although it is extremely short-lived. For example, an emergency call, notification of the location and time, confirmation of survival, etc. Although this information is transmitted over a short period of time, if it is used in the same frequency band as other long calls, the transmission efficiency may be extremely poor.

[Means for solving problems]

In order to solve these problems, the present invention:

an encoding means for encoding an analog audio signal into a digital signal; a transmission storage means for storing the output of the encoding means for a certain short period of time; a transmission means for wirelessly transmitting the content stored in the transmission storage means; A receiving means for receiving the results wirelessly transmitted by the transmitting means, a notification means for notifying that the results have been received by the receiving means, a receiving storage means for storing the output of the receiving means, and controlling the output of the contents of the receiving storage means. and a decoding means for decoding the signal output from the reception storage means and outputting it as analog audio.

[Effect]

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

〔Example〕

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

The clock sending circuit 5 outputs the write clock CL of the memory 4.
This circuit generates I and is composed of a timer 6 and an AND gate 7. The operation of this clock sending circuit 5 will be explained. When the audio input switch 3 is turned on, the output of the timer 6 of Ts starts from that point on. While the timer 6 is rising, the AND gate 7 is open, allowing the output signal CLO of the clock generation circuit 8 to pass through, and transmitting the clock CLI for writing into the memory 4.

Further, while the output of the timer 6 is rising, the audio input display section 9 lights up to inform the user that the memory 4 is currently storing information.

Next, a method for checking the contents stored in the memory 4 will be explained. When the confirmation switch 10 is turned on, the output of the timer 11 rises. The rising time of timer 11 is timer 6.
is chosen to be the same value.

While the output of timer 11 is rising, switch 12
is turned on and sends the contents of memory 4 to decoder 13.

The sent contents of the memory 4 are converted into an analog audio signal by the decoder 13 and sent out as audio 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 CLO of the clock generation circuit while the output of the timer 11 is rising. Also, while the output of timer 11 is rising,
The confirmation display section 16 lights up to notify 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 a combining section 18, and is wirelessly transmitted by a transmitter 19 serving as a transmitting means.

Next, transmission control of the transmitter 19 will be explained.

When the transmission switch 20 is turned on, the timer 21. If there is no response output from the transmission limiting circuit constituted by the delay circuit 22, the output of the timer 24 increases through the OR gate 23 for the Tt waiting time. T when the output of timer 24 is rising
The AND gate 25 opens for a time t, and the clock generation circuit 2
The read clock CL2 is supplied to the memory 4 through the switch circuit 15. The switch circuit 15 switches the AND gate 2 while the confirmation switch 10 is not turned on, that is, while the timer 11 is not operating.
The output signal C of No. 5 is selected. Further, when the timer 24 rises, the identification signal d is sent out from the identification signal generating section 17 and is combined with the output signal e of the memory 4 in the combining section 18 . As a result of the synthesis, the contents of the memory 4 continue starting with the identification signal. While the timer 24 is running, the output signal f of the combining section 18 is wirelessly transmitted from the transmitter I9. During this time, the transmission display section 26 lights up to inform the user that the identification signal and audio information in the memory 4 are being transmitted wirelessly. In this case, by repeatedly and continuously turning on and off the transmission switch 20, the wireless transmitter 1
9 in succession, only a specific user will monopolize the wireless line. To prevent this, timer 2
1. A transmission limiting circuit made up of a delay circuit 22 is used.

Next, the operation of this transmission restriction circuit will be explained.

When the transmission switch 20 is turned on for the first time, the timer 21
Even if it responds, there is a delay caused by the delay circuit 22, so no response signal is output from the delay circuit 22, and the rising edge of the transmission switch 20 is manually input to the timer 24 through the OR gate 23. However, when the output signal g of the delay circuit 22 rises due to the output of the timer 21 rising for a certain time Ta, the OR gate 23 does not respond even if the transmission switch 20 is turned on for the time Ta, and therefore the timer 24
However, human resources will remain unavailable. In other words, Ta
You need to wait for an hour.

By having this transmission restriction circuit in the transmitting device, it is no longer possible for only a specific person to occupy the radio section, and the content of voice information transmission tends to be only those with high urgency and value. It has extremely high utility value.

Next, the receiving apparatus shown in FIG. 2 will be explained.

A signal received by the receiver 31 as a receiving means is input to a memory 32 as a reception storage means.

Clock C for writing data to this memory 32
The generation operation of L3 will be explained. First, when the identification signal judgment circuit 33 judges that the output of the receiver 31 and the contents of the identification signal storage section 34 match, that is, the identification signal included in the received signal and the identification signal of the identification signal storage section 34 match. Then, the output of the timer 35 is raised and the AND gate 36 is opened. During this time, the output of the clock generation circuit 37 is
It passes through the AND gate 36 and becomes the write clock CL3, which causes the memory 32 to operate. In this case, the clock generating circuit 37 is used in synchronization with the output of the receiver 31 in order to ensure normal input to the memory 32.

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

Next, the operation of outputting the contents stored in the memory 32 will be explained. This operation is performed by a timer 41. which constitutes the control means.
This is performed mainly using the AND gate 42 and the clock generation circuit 46. When the audio output switch 40 is turned on, the output of the timer 41 starts up. While the output of the timer 41 is rising, the AND gate 42 is opened and the output of the clock generation circuit 46 is passed through, and the clock C is output from the AND gate 42.
L4 is output. The contents of the memory 32 are outputted by this read clock CL4, converted into an analog audio signal by a decoder 43 serving as a decoding means, and sent out as audio from a speaker 44. On the other hand, while the output of the timer 41 is rising, the audio output display section 45 lights up to notify 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. do. Since the contents of a memory generally do not change depending on the read clock, the contents received and stored in the memory 32 are output many times each time the audio switch 40 is turned on, and can be heard as audio.

Since the receiving device has such a function, even if a message is received when the user is not present, the message remains stored and can be reproduced repeatedly later. Therefore, since the received content can be listened to again and again, the user will not miss anything and the audio information will be reliably transmitted.

Next, the relationship between each clock will be described. Clock CLI
and clock CL4 have the same frequency, and clock CL2
and clock CL3 have the same frequency. The relational expression for each clock is as follows.

CLI engineering CL4 CL2=CL3 CL2=CL1/K The value of K is determined by the radio device used. For example, ADM with a coding rate of 16 kbps as C0DER2
When (adaptive delta modulation) is used, if the usable radio equipment can only handle low transmission speeds of about 3.2 kbps, it is sufficient to select =5. Transmission speed 3.
For 2 kbps transmission, the transmission time is Tt=Ts 5
Although it is twice as necessary, F to transmit normal audio in analog form.
It is sufficiently covered by the transmission frequency band of the M radio, and there is no need to use a special radio exclusively for digital signal transmission. Further, even if the audio quality is sufficiently improved by increasing the encoding speed, by selecting K sufficiently large, it is possible to transmit without widening the frequency band. Therefore, it coexists with analog systems conventionally used at 25 kHz frequency intervals, and is suitable for low current and miniaturization, making it suitable for transmitting voice information in mobile communications.

The above is a description of the device shown in the figure. For the receiving device,
After determining the identification signal by the identification signal determination circuit 33,
The output was input to the timer 35 and the set/reset circuit 38, but instead, a receiver 31 that determines whether or not there is a received electric field and outputs a squelch signal is used, and this squelch signal is sent to the timer 35. may also be input to the set/reset circuit 38. In this way, all transmissions from unspecified users are received, but the identification signal judgment circuit 33 and the identification signal storage section 34 are not required, and there is an advantage of being small and economical.

Next, a method of using the apparatus shown in the figure will be explained.

In the transmitter, the user first turns on the audio input switch 3 and inputs audio from the microphone 1 in a short period of time.

Next, after turning on the confirmation switch 10 and confirming the input voice content, the transmission switch 20 is turned on.

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

〔Effect of the invention〕

As explained above, the present invention includes an encoding means for encoding an analog audio signal into a digital signal, a transmission storage means for storing the output of the encoding means for a certain short period of time, and a A transmitting means for wirelessly transmitting the content, a receiving means for receiving the result wirelessly transmitted by the transmitting means, a notification means for notifying that the content has been received by the receiving means, and a reception storage means for storing the output of the receiving means, By providing a control means for controlling the output of the contents of the reception storage means and a decoding means for decoding the signal output from the reception storage means and outputting it as analog audio, it is possible to convert analog audio information into digital audio information. Since the information can be stored in memory and transmitted for a short period of time, the usage time per person can be shortened, which has the effect of increasing the efficiency of wireless line usage. In other words, since it handles only short information rather than a mixture of long and short information, it can be used by a large number of people, making it suitable for effective use of frequencies.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a transmitting device constituting an audio information transmitting device according to the present invention, and FIG. 2 is a circuit diagram showing an embodiment of a receiving device similarly constituting this device. 1...Microphone, 2...Encoder, 3...Audio input switch, 4, 32...Memory, 5...Clock sending circuit, 6, 11, 21゜24. 35.41・
・・・Timer, 7, 25, 36, 42 ・ ・ ・ ・
AND gate, 8. 27. 3-7.46...Clock generation circuit, 9...Audio input display section, 10...
...Confirmation switch, 12...Switch, 13.43
... Decoder, 14.44 ... Speaker, 15.
...Switch circuit, 16...Confirmation display section, 17.
...Identification signal generation section, 18...Synthesizing section, 19...
...Transmitter, 20...Transmission switch, 22...
Delay circuit, 23...OR gate, 26...transmission display unit, 31...receiver, 33...identification signal judgment circuit, 34...identification signal storage unit, 38... ... Set/reset circuit, 39... Reception display section, 40.
...Audio output switch, 45...Audio output display section.

Claims (5)

[Claims] (1) An encoding means for encoding an analog audio signal into a digital signal, a transmission storage means for storing the output of the encoding means for a certain short period of time in conjunction with an audio input switch, and storage in the transmission storage means. a transmitting means for wirelessly transmitting the received content, a receiving means for receiving the results wirelessly transmitted by the transmitting means, a notification means for notifying that the results have been received by the receiving means, and a reception memory for storing the output of the receiving means. control means for controlling the content of the reception storage means to be output in conjunction with an audio output switch; and decoding means for decoding the signal output from the reception storage means and outputting it as analog audio. A voice information transmission device characterized by: (2) Audio information transmission according to claim 1, wherein the transmission storage means has a function of confirming the stored content by converting it into an analog audio signal and outputting it in conjunction with a confirmation switch. Device. (3) The audio information transmitting device according to claim 1, wherein the transmitting means wirelessly transmits at a transmission rate lower than the encoding rate in the encoding means. (4) The audio information transmitting device according to claim 1, wherein the transmitting means is unable to transmit wirelessly for a certain fixed period of time after turning on the transmitting switch and transmitting wirelessly. (5) The audio information transmitting device according to claim 1, wherein the notification means notifies that the received signal has been received when the identification signal included in the received signal is determined to be appropriate.