JPH087600B2 - Simultaneous recording / playback device - Google Patents

Description

The present invention relates to a simultaneous recording / reproducing apparatus in a digital type recording / reproducing apparatus using a digital memory such as a semiconductor memory.

[Conventional technology]

The weather forecast notification service using the telephone network is a service that records a voice message related to the weather forecast to a specific recording / playback device connected to the electric network and then connects to the user's line to play back the recorded message and notify it. is there.

FIG. 3 is a block diagram showing the connection method of the weather forecast notification service in the current telephone network. In the figure,
1, 2 is a switch, 3, 5 is a recording / playback device, 4 is a recording input device,
6 is a distribution amplifier, 7 is a telephone, 8 is a subscriber line, and 9 is an exchange.

Next, the operation of the notification service will be described. First, in FIG. 3, when the contacts a of the switching devices 1 and 2 are not operating, the recording / reproducing apparatus 3 is connected to the recording input apparatus 4 and used for recording, and the recording / reproducing apparatus 5 is connected to the distribution amplifier 6. It is used for reproduction. Voice information about the weather forecast input from the recording input device 4 such as a microphone is recorded in the recording / reproducing device 3 for recording via the switch 1.

On the other hand, the user dials a specific number from the telephone 7 and is connected to the recording / playback device 5 for playback via the subscriber line 8, the exchange 9, the distribution amplifier 6, the recording / playback switching device 2, and You can listen to audio information. Recording / playback device 3
When the input of new notification information to the recording / reproducing device is completed, the recording / reproducing device 3 becomes for reproduction and the recording / reproducing device 5 becomes for recording by operating the contacts a of the switching devices 1 and 2.

Thus, in the past, two recording / playback devices were installed, one was used for recording, the other was used for playback, and when a new message was recorded, it was instantly switched and played back for recording. It was necessary to use what was originally for playback and for recording. As a result, two identical devices are required and a switching device is required, which is expensive.

[Problems to be solved by the invention]

Therefore, it can be said that the problem to be solved by the present invention is to enable recording and reproduction without using two identical devices to reduce the cost.

Therefore, it is an object of the present invention to provide a simultaneous recording / reproducing system that enables the above.

[Means and Actions for Solving Problems]

In order to achieve the above object, the simultaneous recording / reproducing system according to the present invention is an AD converter that inputs a voice analog signal and converts it into a digital signal and outputs it, and a DA converter that inputs a digital signal and converts it into a voice analog signal and outputs it. , A central processing unit (hereinafter referred to as CPU), and a voice memory including at least a first and a second, and a CP
U writes the digital signal taken in through the AD converter to the first memory as recording data,
When the digital signal written in the second memory is read out, converted into an audio analog signal by the DA converter and output as reproduction data, and a switching signal is input, the first signal previously recorded is recorded. It is characterized in that the memory is used for reproduction, and the second memory which has been used for reproduction is switched and used for recording.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.
In the figure, 10 is a microphone input terminal, 11 is a tape recorder input terminal, 12 is a mixer, 13 is an amplifier, 14 is an AD converter, 15 is a serial / parallel conversion shift register, 16 is a buffer register, and 17 is parallel input / output. A circuit, 18 is a CPU (central processing unit), 19 is a voice memory (consisting of two voice memories (1) and (2)), 20 is a buffer register, 21 is a parallel / serial conversion shift register, and 22 is a DA converter. , 23 is an amplifier, 24 is a digital output interface unit, 26 is a CPU bus, 26 is an analog output terminal, 27 is a digital output terminal, and 28 is a switching signal input terminal.

Next, the operation of the above embodiment will be described. In FIG. 1, during recording, the audio signals input from the microphone 10 and the tape recorder 11 are mixed by the mixer 12, amplified by the amplifier 13, and then 64Kbit / s PCM (pulse code modulation) by the AD converter 14. Converted to serial signal. This serial signal is converted into a parallel signal by the serial / parallel conversion shift register 15, then is taken into the CPU 18 through the buffer register 16 and the parallel input / output circuit 17, and is composed of a semiconductor memory (D / RAM), for example. It is stored in the memory 19.

Further, during reproduction, the data stored in the audio memory 19 is converted to a serial signal by the parallel / serial conversion shift register 21 via the CPU 18, the parallel input / output circuit 17, and the buffer register 20, and converted into an analog signal by the DA converter 22. After being converted and amplified by the amplifier 23, the analog output is performed.

When outputting the digital signal as it is due to the reason of relaying it to another via a digital line, the serial signal converted by the parallel / serial conversion register 21 is output from the digital output terminal 27 via the digital output interface unit 24. You can take it out.

In such a configuration, by controlling the CPU 18, the audio memory 19 is divided into two audio memories (1) and (2) so that one can be used independently for recording and the other for playback. , It becomes possible to record and output the recorded voice information and record new voice information at the same time.

When the storage of new voice information in the voice memory (1) used for recording is completed, the switching signal input terminal 28
By inputting the switching signal from, the voice memory that has been used for recording until now under the control of the CPU 18 (1)
It is possible to change the voice memory (2) used for playback and the voice memory (2) used for playback to be used for recording. In this case, the function that enables switching without interrupting the reproduction message can be realized in the CPU 18.

FIG. 2 is a flow chart showing the flow of control operation of the CPU 18 in FIG.

The chart consists of steps (a) to (g). There is no need to explain these again.

〔The invention's effect〕

As described above, according to the present invention, by controlling the audio memory in one recording / reproducing apparatus, it is possible to record and reproduce simultaneously and independently.
There is an advantage that the weather forecast notification service and the like can be implemented more economically than before.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing the flow of control operation of the CPU in FIG. 1, and FIG. 3 is a block showing a conventional example of a weather forecast notification service connection system. Fig. Reference numeral 1, 2 ...... Switch, 3,5 ...... Recording / reproducing device, 4 ...... Recording input device, 6 ...... Distribution amplifier, 7 ...... Telephone, 8 ...... Subscriber line, 9 ...... Switch, 10 …… Microphone input terminal, 11 …… Tape recorder input terminal, 12 …… Mixer, 13 …… Amplifier,
14 …… AD converter, 15 …… serial / parallel conversion shift register, 16 …… buffer register, 17 …… parallel input / output circuit, 18 …… CPU, 19 …… voice memory, 20 …… buffer register, 21 …… Parallel / serial conversion shift register, 22 …… DA converter, 23 …… Amplifier, 24 …… Digital output interface unit, 25 …… CPU bus, 26 …… Analog output terminal, 27 …… Digital output terminal, 28 …… Switching signal input terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tamotsu Kondo 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Public Corporation (56) References JP-A-60-17797 (JP, A) 59-160347 (JP, U)

Claims (1)

[Claims] 1. An AD converter for inputting a voice analog signal into a digital signal for output, a DA converter for inputting a digital signal into a voice analog signal for output, and a central processing unit (hereinafter referred to as CPU). ) And an audio memory composed of at least two of a first and a second, and the CPU writes the digital signal taken in through the AD converter as recording data in the first memory, When the digital signal written in the memory is read out, converted into an audio analog signal by the DA converter and output as reproduction data, and a switching signal is input, the first memory that was previously for recording is reproduced. The simultaneous recording replay is characterized in that the second memory, which was previously used for playback, is switched and used for recording. Apparatus.