JPH01219800A - Message sound recording and reproduction system - Google Patents

Abstract

PURPOSE:To prevent an unnecessary noise following a message from being reproduced by obtaining a final playback address by subtracting a prescribed address from the memory storage address at the end time of sound recording. CONSTITUTION:A CPU 4 connects an exchange part 3 to a message sound recording part 5 with an indication from a telephone set 1. The sound recording part 5 stores speech PCM signals from the exchange part 3 in a speech memory 52 in order under the control of a sound recording and reproduction control circuit 50 and subtracts the address corresponding to a preset no-reproduction period from the storage address at the time of the reception of a sound recording end signal to calculate the final playback address, which is stored in an address memory 53. When reproduction is performed, a control part 50 set a read address of the memory 52 initially and then reproduces the speech signal in the memory 52 up to the final playback address of the memory 53. Therefore, no unnecessary noise following the message is reproduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a message recording and reproducing system, and particularly to a message recording and reproducing system that is installed so as to be connectable to a private electronic branch exchange to record and reproduce voice messages issued from a telephone. Regarding the method.

[Conventional technology]

In this type of conventional message recording and reproducing system, a message recording section is connected to the telephone of the message originator by dialing or key operation on the telephone, and the voice message from the telephone is stored in the memory of the message recording section. When the voice message is finished and the telephone is switched to on-footer or the end of recording is instructed by key operation, the message recording section stores the final storage address of the memory at the end of recording and waits for a reproduction request. Upon receiving a signal indicating a playback request, the message recording section sequentially reads out the contents of the memory in which the voice message is stored up to the above-mentioned final storage address, and sends the message to the telephone connected to the message recording section in response to the playback request signal. I will send it out.

[Problem to be solved by the invention]

In the conventional message recording and playback method described above, during playback, the recorded content up to the on-footer of the message sender's telephone or the key press to end recording is played back.
There is a problem in that extra noise, switch chatter, etc. are often mixed in after the voice message you want to convey, which is unpleasant to the ears.

SUMMARY OF THE INVENTION An object of the present invention is to provide a message recording and reproducing system that solves the above-mentioned problems and prevents the reproduction of extraneous noise after a voice message to be conveyed.

[Means to solve the problem]

The message recording and reproducing method of the present invention includes a conversion circuit that mutually converts serial and parallel digital audio signals and sends and receives the serial digital audio signals to and from a communication line connected to a telephone set via an exchange connection means; an audio memory for storing an audio signal; an address memory for writing the final address of a reproduced portion of the content stored in the audio memory; and an address memory for storing the digital audio signal coming from the communication path via the conversion circuit during recording. The signals are sequentially stored in the audio memory, and a predetermined address is subtracted from the storage address at the end of recording to calculate the final address of the playback portion, and written in the address memory, and at the time of playback, the contents stored in the audio memory and a recording/playback control circuit that sequentially reads out the playback portion written in the address memory up to the final address of the playback portion and sends it to the communication path via the conversion circuit.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are flowcharts showing the operation of the message recording unit 5 in FIG. 1 during recording and playback, respectively.

When receiving a dial or key operation signal instructing message recording from the telephone 1, the interface circuit 2 transmits the signal to a central processing unit (CPU) 4. C
In response, the PU 4 switches the time division switch (TD-8W) 3 to connect the communication path with the telephone 1 to the conversion circuit 51 of the message recording unit 5 via the interface circuit 2.
At the same time, it sends a recording request signal to the recording/playback control section 50 of the message recording section 5.

As shown in FIG. 2, upon receiving the recording request signal (step 1), the recording/playback control unit 50 initializes the storage address in the audio memory 52 (step 2), and then
Pulse code modulation (PCM) sent from D-SW3
The signal converted into parallel data by the conversion circuit 51 is read and stored in the audio memory 52 (step 3). Thereafter, the recording/playback control circuit 50 sequentially stores the audio signals in the audio memory 52 while incrementing the storage address in the audio memory 52 in synchronization with the operation timing of the conversion circuit 51 for serial-parallel conversion. (Step 4)

The interface circuit 2 detects the end of recording due to on-hook or key operation of the telephone 1, and transmits this to the CPU 4. In response, the CPU 4 releases the connection path of the TD-3W3 and sends a signal instructing the end of recording. The data is sent to the recording/playback control section 50 (step 5).

The recording/playback control unit 50 calculates the final address of the playback portion by subtracting the address corresponding to the preset non-playback period from the storage address at the time of receiving the recording end signal, and stores the address in the address memory 5.
3 (step 6).

For example, a PC with a period of 125 microseconds (μ5ec)
In the case of M signal, the address corresponding to the non-reproduction period is FFF
(Hexadecimal display value), a non-reproduction period of about 0.5 seconds can be obtained. In this example, if the storage address at the time of receiving the recording end signal is, for example, 2FFFF (hexadecimal display value), the final address for the playback portion is 2FOOO (=2FFFF).
F-FFF), and this value data is stored in the address memory 53.
is stored in

At the time of reproduction, the CPU 4 controls the connection of the TD-SW 3 to connect the conversion circuit 51 of the message recording section 5 to the communication path with the reproduction telephone 1, and sends a reproduction request signal to the recording and reproduction control section 50.

As shown in FIG. 3, when this recording/playback control unit 50 receives a playback request signal (step 11), it
After initializing the read address of No. 2 (Step 12), the audio data stored in the audio memory 52 is sequentially read from the beginning to the last address of the playback part in the address memory 53, and sent to the conversion circuit 51 (Step 13. 14).

The conversion circuit 51 converts the parallel data read from the audio memory 52 into serial data and sends it as a PCM signal to the telephone 1 for audio reproduction.

In the case of the above example, of the contents stored up to address 2FFFF in the audio memory 52, the portion up to address 2FOOO is converted into a PCM signal and sent to telephone 1, and the remaining portion, that is, the signal generated due to the recording end operation. The part containing noise is not sent to telephone 1.

In this way, when the playback portion of the content stored in the audio memory 52 has been sent out, the recording/playback control circuit 5° sends a signal indicating the end of playback to the CPU 4 (step 15), and performs a predetermined procedure, for example, to the telephone 1. A procedure for sending a reproduction end signal and opening the connection path of the TD-3W3 in response to the response operation is executed.

〔Effect of the invention〕

As explained above, the present invention prevents the last part of the recorded content of a voice message from being transmitted during playback.
This has the effect of preventing unnecessary noise from being played after a voice message.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 and 3 are flowcharts showing the operation of the message recording section 5 in FIG. 1 during recording and reproduction, respectively. 1...Telephone, 2...Interface circuit, 3...Time division switch (TD-3W), 4
・Old...Central processing unit (CPU), 5...
Message recording unit, 50... Recording/playback control circuit, 5I... Conversion circuit, 52... Voice memory, 53... Address memory. M1 Old Edition 21) Ga 3

Claims (1)

[Scope of Claims] A conversion circuit that mutually converts serial and parallel digital audio signals and sends and receives the serial digital audio signals to and from a communication path connected to a telephone set via exchange connection means; an address memory in which the final address of the playback part of the content stored in the audio memory is written; and an address memory in which the final address of the playback part of the content stored in the audio memory is written; The final address for the playback portion is calculated by subtracting a predetermined address from the storage address at the end of recording, and is written to the address memory, and at the time of playback, the contents stored in the audio memory are stored at the address. A message recording and reproducing method comprising: a recording and reproducing control circuit that sequentially reads out the reproduction portion written in a memory up to the final address and transmits it to the communication path via the conversion circuit.