JPH089038A - Audio signal recording / reproducing device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an audio signal recording / reproducing apparatus capable of audibly confirming accumulated audio data when a hard disk, which is a storage medium of a voice mail system, is destroyed due to some cause. To do. A voice signal converted into a pulse code modulated signal is recorded in a RAM 19 by a DMA controller 20 and a voice signal demodulated by a codec 21 from the RAM 19 is recorded on a cassette tape by a cassette recorder 22 under the control of a CPU 23. Let and play.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice mail system connected to a key telephone device, when a hard disk or the like as a recording medium is destroyed due to some cause,
The present invention relates to an audio signal recording / reproducing device that enables audio confirmation of accumulated audio data.

[0002]

2. Description of the Related Art In the current telephone service, communication cannot be established unless the caller and the callee are present at the same place where there is a telephone, so it is necessary to call again many times if there is no other party. Or even if you ask someone on the other side for a message to call you back, when the other person gives you a call back, you can't talk to each other forever Such situations often occur. Also, even if the call receiving side is busy and it is difficult to be interrupted, the caller is often forced to interrupt the current work. Occurs.

A voice mail system was devised to solve these problems. This voice mail system ensures that the content you want to talk to is temporarily stored in the storage unit in the system and continues to call automatically until the other party responds, or waits for the other party to read the stored content, so that you can be sure It is intended to be delivered to the other party. When the voice mail system receives an incoming call, the voice from the caller is stored in the storage unit, and the user can listen to the stored contents at a convenient time.

[0004]

However, a hard disk mainly used as a storage medium in the above-mentioned voice mail system may have a very high possibility of failure depending on the environment in which it is installed. The causes of the failure include condensation due to temperature difference, vibration, shock, power failure,
Dust, cigarette smoke, etc. may be considered. In the computer world, a method of backing up to a floppy disk, a data streamer, or the like has been adopted against the failure of the hard disk due to these factors. On the other hand, there is no effective backup method in the voice mail system connected to the current key telephone device.

The present invention has been made in view of the above-mentioned problems of the above-mentioned conventional technique, and its object is that the hard disk, which is a storage medium of the voice mail system, is caused by some reason. When destroyed,
It is an object of the present invention to provide an audio signal recording / reproducing device capable of confirming accumulated audio data by voice.

[0006]

In order to achieve the above object, the audio signal recording / reproducing apparatus of the first invention of the present invention is an audio signal recording / reproducing apparatus for recording / reproducing an audio signal of a frequency band used in a telephone, First recording means for recording the voice signal converted into the pulse code modulated signal, and the voice signal converted into the pulse code modulated signal in the first recording means, and at the same time from the first recording means First control means for controlling reproduction, decoding means for decoding the voice signal converted into the pulse code modulated signal recorded in the first recording means into an analog signal, and the decoding means Second recording means for recording the audio signal converted into the analog signal, second control means for controlling recording / reproduction of the audio signal to / from the second recording means, and audio from the second recording means. A voice code converted into a pulse code modulation signal by the coding means by reproducing the signal to encode the analog voice signal recorded in the second recording means into a pulse code modulation signal. Signal
It is characterized in that the first control means records the data in the first recording means and at the same time, reproduces the audio signal converted into the pulse code modulated signal from the first recording means.

In order to achieve the same object, an audio signal recording / reproducing apparatus according to a second invention of the present invention is an audio signal recording / reproducing apparatus for recording / reproducing an audio signal in a frequency band used in a telephone. Decoding means for decoding the voice signal converted into the analog signal into an analog signal, first A / D conversion means for converting the analog voice signal decoded by the decoding means into a digital voice signal, and the first First compression means for compressing the digital audio signal converted by the A / D conversion means, first recording means for recording the digital audio signal compressed by the first compression means, and the first First control means for controlling the digital audio signal compressed by the compression means to be recorded in the first recording means and simultaneously reproduced from the first recording means; and the first control means. First expansion means for expanding the compressed digital audio signal recorded by the recording means, and first D / A conversion means for converting the digital audio signal expanded by the first expansion means into an analog audio signal. When,
Second recording means for recording the analog audio signal converted by the first D / A conversion means, second control means for controlling recording / reproduction of the audio signal to / from the second recording means, Second A / D converting means for converting the analog audio signal recorded by the second recording means into a digital audio signal, and a second A / D converting means for compressing the digital audio signal converted by the second A / D converting means. Compressed digital audio signal compressed by the second compressing means and recorded by the first control means in the first recording means and simultaneously reproduced by the first recording means. Second expanding means for expanding the audio signal; second D / A converting means for converting the digital audio signal expanded by the second expanding means into an analog audio signal; and the second
Encoding means for encoding the analog voice signal converted by the D / A converting means of 1. into a pulse code modulated signal.

Further, in order to achieve the same object, the first
The recording means is RAM, the first control means is a DMA controller, the decoding means is a codec, the second recording means is a cassette recorder, and the second control is It is preferable that the means is a CPU and the encoding means is a codec.

[0009]

According to the audio signal recording / reproducing apparatus of the first invention, the audio signal converted into the pulse code modulated signal by the encoding means,
After the first control means records the first recording means, at the same time, the first recording means demodulates the audio signal converted into the pulse code modulated signal into an analog signal,
The second control means causes the second recording means to record and reproduce. As a result, when the hard disk, which is the recording medium of the voice mail system, is destroyed due to some cause, the accumulated voice data can be confirmed by voice.

The audio signal recording / reproducing apparatus of the second invention is an analog signal obtained by compressing an audio signal accumulated in a hard disk, which is a storage medium of a voice mail system, into a recording medium such as a commercially available cassette tape at the same time as the accumulation. To record and play. As a result, when the hard disk, which is the recording medium of the voice mail system, is destroyed due to some cause, the accumulated voice data can be confirmed by voice.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a configuration of a backup system which is a voice signal recording / reproducing apparatus according to a first embodiment of the present invention, a key telephone apparatus and a voice mail system connected to the backup system. In the figure, 1 is a key telephone device, 2 is a voice mail system,
3 is a backup system.

The key telephone device 1 comprises a device body 4 and a plurality (two in this embodiment) of dedicated telephones 5 and 6. The device main body 4 includes an external line interface 7, an internal line interface 8, a PCM highway 9 that is a high-speed signal line for pulse-code-modulated audio signals, and a switching unit 10 that exchanges and connects the pulse-code-modulated audio signals. , A CPU (Central Processing Unit) 11 for controlling the operation of the entire key telephone device. The external line interface 7, the internal line interface 8, and the exchange unit 10 are connected to each other via a PCM highway 9. The external line interface 7, the internal line interface 8 and the exchange unit 10 are C
It is connected to the PU 11. The outside line interface 8 is a station line or PBX from NTT (Nippon Telegraph and Telephone Public Corporation).
A plurality of outside lines 12 such as an extension line of a (private branch exchange) are connected. The extension interface 8 includes dedicated telephones 5 and 6
Is connected by wire.

The voice mail system 2 is connected to the extension interface 8 of the device body 4 of the key telephone device 1 to transmit and receive a voice signal. The voice mail system 2 includes an extension interface 13 connected to the extension interface 8 of the device body 4 of the key telephone device 1.
A signal transmission unit 14 for transmitting and receiving an audio signal to and from the backup system 3, a compression / expansion unit 15 for compressing / expanding a pulse code modulated audio signal, and an audio signal compressed by the compression / expansion unit 15. Has a hard disk (HD) 16 for storing data and a CPU 17 for controlling the operation of the entire voice mail system 2.

The backup system 3 is connected to the signal transmission unit 14 of the voice mail system 2 to transmit / receive a voice signal. The backup system 3 includes a signal transmission unit 18 for transmitting and receiving a voice signal to and from the voice mail system 2, a RAM (readable and writable memory) 19 for storing a voice signal encoded into a PCM signal, and a PCM signal encoded into a PCM signal. A DMA controller 20 for storing the reproduced audio signal in the RAM 19 by direct memory access and reproducing it from the RAM 19 at the same time, a function of decoding the audio signal encoded into the PCM signal into an analog signal, and the analog audio signal into the PCM signal It has a codec (CODEC) 21 having a function for converting the data, a commercially available cassette recorder 22 for recording an analog audio signal on a commercially available cassette tape, and a CPU 23 for controlling the operation of the entire backup system 3. In the above configuration,
The flow of a voice signal to the backup system 3 when the operator is absent and the incoming call to the key telephone device 1 is set to be transferred to the voice mail system 2 will be described.

An incoming call from the outside line 12 is closed by a direct current by the outside line interface 7 and shifts to a call state. The message from the caller is converted into a pulse code modulation (PCM) signal by the outside line interface 7 and sent to the PCM highway 9. Then, the PCM signal sent to the PCM highway 9 is transferred to the extension interface 8 by the exchange unit 10 and sent from the extension interface 8 to the extension interface 13 of the voice mail system 2. The voice mail system 2 sends the PCM signal from the key telephone device 1 received by the extension interface 13 to both the compression / expansion unit 15 and the signal transmission unit 14. The PCM signal sent to the compression / expansion unit 15 is compressed by the compression / expansion unit 15 and then stored in the hard disk 16. On the other hand, the PCM signal sent to the signal transmission unit 14 is sent to the signal transmission unit 18 of the backup system 3. The backup system 3 sends the PCM signal from the voice mail system 2 received by the signal transmission unit 18 to the DMA controller 20.

The subsequent flow of the audio signal in the backup system 3 will be described in detail with reference to FIG. 1 and FIGS.

FIG. 2 is a flowchart showing a control procedure in which the audio signal converted into the PCM signal is sent to the cassette recorder and recorded on the cassette tape.

From the signal transmitter 18 to the DMA controller 2
The audio signal converted to the PCM signal sent to 0 is first written in the RAM 19 at the writing speed f [Hz] by the DMA controller 20 in step S200. At the same time, the voice signal converted into the written PCM signal is read by the DMA controller 20 at a read speed of 4 f [Hz] in the next step S201.

Here, the unit of the amount of data for writing the audio signal converted into the PCM signal into the RAM 19 is A [bit], and the time required for writing this amount of data is B [sec].
Then, when reading at a speed four times as high as the writing speed, it takes only B / 4 [seconds] to read A [bit]. Therefore, the DMA controller 20 performs the reading while waiting for the data to be read to be written in the RAM 19.

The audio signal converted into the PCM signal read by the DMA controller 20 in the step S201 is processed by the codec 21 in the next step S202.
Is decoded into an analog voice signal. This analog voice signal has a frequency band 3.4 of the voice signal of the original telephone.
It has a frequency band of 13.6 [kHz], which is four times that of [kHz], and the reproduction time of the signal is as short as ¼.
Then, in step S202, the codec 21
The analog audio signal decoded by is recorded on a commercially available cassette tape by the cassette recorder 22 in the next step S203, and then this processing operation is ended.

The recording start operation and recording stop operation of the cassette recorder 22 are controlled by the CPU 23. Generally available normal type cassette tapes can record audio signals of 16 [kHz]. Therefore, the analog audio signal read at the read speed of 4 f [Hz] can be recorded on a commercially available cassette tape.

Next, the control procedure in which the analog audio signal recorded on the cassette tape is written in the RAM 19, read at the same time, and sent to the signal transmission section 18 will be described with reference to the flowchart of FIG.

First, the cassette tape is reproduced in step S300, and the reproduced analog audio signal from the cassette tape is converted into a PCM signal in the next step S301. At this time, the recording start operation and the recording stop operation of the cassette recorder 22 are controlled by the CPU 23.
The voice signal converted into the PCM signal in step S301 is processed by the DMA controller 2 in step S302.
With 0, the data is written in the RAM 19 at the writing speed f [Hz]. At the same time, the voice signal converted into the written PCM signal is DMA-processed in the next step S303.
After being read by the controller 20 at the read speed of 4 f [Hz], this processing operation is ended.

Here, the unit of the data amount for writing the audio signal converted into the PCM signal in the RAM 19 is C "bit".
And the time required to write this amount of data is D
If "second" is set, 4 x D "seconds" is required to read C "bit" when reading at 1/4 times the writing speed.
Time is required. Therefore, the DMA controller 20
Writes data intermittently so that new data is not written on data that has not been read yet due to the difference between the data writing time and the data reading time.

After that, the PCM signal is sent to the voice mail system 2 via the signal transmission unit 18, and further to the exchange unit 10 of the device main body 4 of the key telephone device 1. Then, the message is sent from the exchange section 10 to the dedicated telephone set 5 or 6 via the extension interface 8 and the operator listens to the message from the caller stored in the backup system 3 using the handset of the dedicated telephone set 5 or 6. be able to.

Although the case where the message left by the caller is backed up when the called party is absent has been described above, it is possible to back up both the caller and the called party.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a block diagram showing the configuration of a backup system which is a voice signal recording / reproducing apparatus according to the second embodiment of the present invention, and a button telephone apparatus and a voice mail system connected to the backup system. The same parts as those in FIG. 1 of the first embodiment are designated by the same reference numerals. 4 is different from FIG. 1 in the configuration of the backup system. That is, the backup system 3'of the present embodiment is similar to the backup system 3 of FIG. 1 except that the first and second analog / digital conversion units 24 and 25 and the first and second compression / expansion units 2 are provided.
6, 27 are added, and the arrangement position of the codec 21 is between the signal transmission unit 18 and the DMA controller 20.

First and second analog-to-digital converter 2
Reference numerals 4 and 25 have a function of converting an analog voice signal into a digital voice signal and a function of converting a digital voice signal into an analog voice signal. The first and second compression / expansion units 26 and 27 have a function of compressing a digital audio signal and a function of expanding a digital audio signal. First analog-to-digital converter 24
Is provided between the codec 21 and the DMA controller 20, and the first compression / expansion unit 26 is provided between the first analog / digital conversion unit 24 and the DMA controller 20. Further, the second analog / digital conversion unit 25 is provided between the cassette recorder 22 and the DMA controller 20, and the second compression / decompression unit 27 is provided between the second analog / digital conversion unit 25 and the DMA controller 20.
And are respectively disposed between and.

In the above configuration, the flow of the voice signal to the backup system 3'when the operator is absent and the incoming call to the key telephone device 1 is set to be transferred to the voice mail system 2 will be described. To do.

An incoming call from the outside line 12 is closed by direct current by the outside line interface 7 and shifts to a call state. The message from the caller is converted into a pulse code modulation (PCM) signal by the outside line interface 7 and sent to the PCM highway 9. Then, the PCM signal sent to the PCM highway 9 is transferred to the extension interface 8 by the exchange unit 10 and sent from the extension interface 8 to the extension interface 13 of the voice mail system 2. The voice mail system 2 sends the PCM signal from the key telephone device 1 received by the extension interface 13 to both the compression / expansion unit 15 and the signal transmission unit 14. The PCM signal sent to the compression / expansion unit 15 is compressed by the compression / expansion unit 15 and then stored in the hard disk 16. On the other hand, the PCM signal sent to the signal transmission unit 14 is sent to the signal transmission unit 18 of the backup system 3 '. Backup system 3 '
Then, the PCM signal from the voice mail system 2 received by the signal transmission unit 18 is sent to the codec 21.

The subsequent flow of the audio signal in the backup system 3'will be described in detail with reference to FIGS. 5 to 8 together with FIG.

FIG. 5 is a flowchart showing a control procedure in which the audio signal converted into the PCM signal is written in the RAM 19. The audio signal converted into the PCM signal sent from the signal transmission unit 18 to the codec 21 is first decoded by the codec 21 into an analog audio signal in step S500. This analog voice signal is converted into a digital signal by the first analog-to-digital converter 24 in the next step S501. Then, the data amount of the digital signal is compressed by the first compression / expansion unit 26 in the next step S502. The compressed digital signal is written in the RAM 19 at the writing speed f [Hz] by the DMA controller 20 in the next step S503, and then this processing operation is ended.

FIG. 6 is a flow chart showing a control procedure in which the compressed digital signal written in the RAM 19 is sent to the cassette recorder 22 and recorded on the cassette tape. At the same time that the digital signal is written to the RAM 19 in step S503 of FIG. 5, the written and compressed digital signal is first read by the DMA controller 20 at a read speed of 4 f [Hz] in step S600.

Here, the unit of the amount of data for writing the digital signal compressed by the first compression / expansion unit 26 into the RAM 19 is A [bit], and the time required for writing this amount of data is B [sec]. , When reading at four times the writing speed, B
/ 4 [sec] time is required. Therefore, the DMA controller 20 performs the reading while waiting for the data to be read to be written in the RAM 19. The data amount of the compressed digital signal read by the DMA controller 20 in step S600 is expanded by the second compression / expansion unit 27 in the next step S601.

Next, this digital signal is converted into an analog voice signal by the second analog-to-digital converter 25. This analog voice signal is four times the frequency band 3.4 [kHz] of the voice signal of the original telephone 13.
It has a frequency band of 6 [kHz] and the signal reproduction time is 1
It is as short as / 4. Then, the step S602
The analog audio signal converted in (1) is recorded on a commercially available cassette tape by the cassette recorder 22 in the next step S603, and then this processing operation is ended.

The recording start operation and recording stop operation of the cassette recorder 22 are controlled by the CPU 23. Generally available normal type cassette tapes can record audio signals of 16 [kHz]. Therefore, the analog audio signal read at the read speed of 4 f [Hz] can be recorded on a commercially available cassette tape.

FIG. 7 is a flow chart showing a control procedure in which the analog audio signal recorded on the cassette tape is written in the RAM 19. First, in step S700, the cassette tape is reproduced, and the reproduced analog audio signal from the cassette tape is reproduced in the second step S701.
It is converted into a digital signal by the analog / digital converter 25. At this time, the recording start operation and the recording stop operation of the cassette recorder 22 are controlled by the CPU 23. The data amount of the digital signal converted in step S701 is compressed by the second compression / expansion unit 27 in the next step S702. The compressed digital signal is written in the RAM 19 at the writing speed f [Hz] by the DMA controller 20 in the next step S703, and then this processing operation is ended.

In FIG. 8, the compressed digital signal written in the RAM 19 is sent to the codec 21, and the PCM is executed.
It is a flowchart which shows the control procedure converted into a signal. At the same time that the digital signal compressed in step S703 of FIG.
The written and compressed digital signal is
In step S800, the DMA controller 20 reads data at a read speed of 4 f [Hz].

Here, the unit of the amount of data for writing the digital signal compressed by the second compressing / expanding unit 27 into the RAM 19 is C [bit], and the time required for writing this amount of data is D [sec]. , 1/4 of the writing speed
When reading at double speed, it takes 4 × D [seconds] to read C [bit]. Therefore, the DMA controller 20 intermittently writes data so that new data is not written on data that has not been read yet due to the difference between the data writing time and the data reading time. The data amount of the compressed digital signal read by the DMA controller 20 in step S800 is expanded by the first compression / expansion unit 26 in the next step S801.

Next, this digital signal is converted into an analog voice signal by the first analog-to-digital converter 24. Then, this analog audio signal is converted into a PCM signal by the codec 21 in the next step S803, and then this processing operation is ended.

After that, the PCM signal is sent to the voice mail system 2 via the signal transmission section 18, and further to the exchange section 10 of the apparatus main body 4 of the key telephone apparatus 1. Then, the message is sent from the exchange section 10 through the extension interface 8 to the dedicated telephone 5 or 6 and the operator uses the handset of the dedicated telephone 5 or 6 to send the message from the caller stored in the backup system 3 '. I can listen.

The explanation has been given above regarding the case where the message left by the caller is backed up when the called party is absent, but it is also possible to back up both the caller and the called party.

(Other Embodiments) In the above embodiments, the case of the voice mail system 2 and the case of the backup system 3 or 3'are described as separate bodies. The structure of the button telephone device 1, the case of the voice mail system 2, and the case of the backup system 3 or 3'may be integrated.

In each of the above-described embodiments, the case where a commercially available cassette recorder 22 is adopted has been described, but a function of recording / reproducing an audio signal to / from a cassette tape is provided inside the backup system 3 or 3 '. It may have a configuration provided.

In each of the above embodiments, the cassette tape is used as an example of the recording medium. However, a tape or a disk other than the cassette tape may be used as the recording medium, and accordingly, a recording / reproducing device other than the cassette recorder is also used. But of course it is okay.

Furthermore, in each of the above-mentioned embodiments, the message stored by the backup system 3 or 3'is heard by the operator by the handset of the dedicated telephone 5 or 6 of the key telephone device 1. An analog audio signal amplifying unit and a handset or a speaker may be provided inside the 3 ', and the operator may hear the stored message from the handset or the speaker.

[0048]

As described above in detail, according to the audio signal recording / reproducing apparatus of the present invention, the audio signals stored in the hard disk, which is the recording medium of the voice mail system connected to the key telephone device, are recorded. Since it can be recorded and played back on a commercially available recording medium such as a cassette tape at the same time as it is accumulated, when the hard disk, which is the recording medium of the voice mail system, is destroyed for some reason, the accumulated voice data can be confirmed by voice. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a backup system which is a voice signal recording / reproducing apparatus according to a first embodiment of the present invention, a button telephone apparatus and a voice mail system connected to the backup system.

2 is a block diagram showing a backup system of FIG.
It is a flowchart which shows the control procedure in which the audio | voice signal converted into the signal is recorded on a cassette tape.

In the backup system of FIG. 1, an analog audio signal recorded on a cassette tape is written into a RAM 19 and read at the same time, and a signal transmission unit 18 is read.
It is a flow chart which shows the control procedure sent out to.

FIG. 4 is a block diagram showing a configuration of a backup system which is a voice signal recording / reproducing apparatus according to a second embodiment of the present invention, a key telephone apparatus and a voice mail system connected to the backup system.

5 is a block diagram showing a backup system of FIG.
6 is a flowchart showing a control procedure in which a voice signal converted into a signal is written in a RAM 19.

FIG. 6 is a RAM in the backup system of FIG.
19 is a flowchart showing a control procedure in which the compressed digital signal written in 19 is recorded on a cassette tape.

7 is a flowchart showing a control procedure in which an analog audio signal recorded on a cassette tape is written in a RAM 19 in the backup system of FIG.

FIG. 8 is a RAM in the backup system of FIG.
9 is a flowchart showing a control procedure in which the compressed digital signal written in 19 is sent to the codec 21 and converted into a PCM signal.

[Explanation of symbols]

1 button telephone device 2 voice mail system 3 backup system (voice signal recording / reproducing device) 3'backup system (voice signal recording / reproducing device) 5 dedicated telephone 6 dedicated telephone 19 RAM (first recording means) 20 DMA controller (first Control means) 21 codec (encoding means, decoding means) 22 cassette recorder (second recording means) 23 CPU (second control means) 24 first analog-digital conversion section (first A / D)
Conversion means, first D / A conversion means) 25 second analog / digital conversion section (second A / D)
Conversion unit, second D / A conversion unit) 26 First compression / expansion unit (first compression unit, first expansion unit) 27 Second compression / expansion unit (second compression unit, second expansion unit) means)

Claims (14)

[Claims] 1. An audio signal recording / reproducing apparatus for recording / reproducing an audio signal in a frequency band used in a telephone, and a first recording means for recording an audio signal converted into a pulse code modulated signal, and the pulse code modulated signal. And a pulse code recorded in the first recording means, the first recording means controlling the audio signal converted into the audio signal to be stored in the first recording means and simultaneously reproduced from the first recording means. Decoding means for decoding the voice signal converted into the modulated signal into an analog signal, second recording means for recording the voice signal converted into the analog signal by the decoding means, and the second recording means Second control means for controlling recording / reproduction of the audio signal, and pulse code conversion of the analog audio signal recorded in the second recording means by reproducing the audio signal from the second recording means. And an audio signal converted into a pulse code modulation signal by the encoding means by the first control means at the same time as being recorded in the first recording means. An audio signal recording / reproducing apparatus which reproduces an audio signal converted into a pulse code modulation signal from the first recording means. 2. The audio signal recording / reproducing apparatus according to claim 1, wherein the first recording means is a RAM. 3. The audio signal recording / reproducing apparatus according to claim 1, wherein the first control means is a DMA controller. 4. The audio signal recording / reproducing apparatus according to claim 1, wherein the decoding means is a codec. 5. The audio signal recording / reproducing apparatus according to claim 1, wherein the second recording means is a cassette recorder. 6. The audio signal recording / reproducing apparatus according to claim 1, wherein the second control means is a CPU. 7. The audio signal recording / reproducing apparatus according to claim 1, wherein the encoding means is a codec. 8. A voice signal recording / reproducing apparatus for recording / reproducing a voice signal of a frequency band used in a telephone, and a decoding means for decoding a voice signal converted into a pulse code modulated signal into an analog signal, and the decoding means. First A / D conversion means for converting the analog audio signal decoded by the means into a digital audio signal, and first compression means for compressing the digital audio signal converted by the first A / D conversion means. A first recording means for recording the digital audio signal compressed by the first compressing means, and a digital audio signal compressed by the first compressing means for recording in the first recording means and at the same time First control means for controlling reproduction from the first recording means, and first expansion means for expanding the compressed digital audio signal recorded by the first recording means. Expansion means, first D / A conversion means for converting the digital audio signal expanded by the first expansion means into an analog audio signal, and analog audio signal converted by the first D / A conversion means. And a second control means for controlling recording / reproduction of an audio signal to / from the second recording means, and an analog audio signal recorded by the second recording means into a digital audio signal. Second A / D conversion means for converting the second A / D
Second compressing means for compressing the digital audio signal converted by the converting means, and recording the digital audio signal compressed by the second compressing means in the first recording means by the first control means, and At the same time, a second expanding means for expanding the compressed digital audio signal reproduced from the first recording means, and a second expanding means for converting the digital audio signal expanded by the second expanding means into an analog audio signal. An audio signal recording / reproducing apparatus comprising: a D / A converting means; and an encoding means for encoding an analog audio signal converted by the second D / A converting means into a pulse code modulation signal. 9. The audio signal recording / reproducing apparatus according to claim 8, wherein the first recording means is a RAM. 10. The audio signal recording / reproducing apparatus according to claim 8, wherein the first control means is a DMA controller. 11. The audio signal recording / reproducing apparatus according to claim 8, wherein the decoding means is a codec. 12. The audio signal recording / reproducing apparatus according to claim 8, wherein the second recording means is a cassette recorder. 13. The audio signal recording / reproducing apparatus according to claim 8, wherein the second control means is a CPU. 14. The audio signal recording / reproducing apparatus according to claim 8, wherein the encoding means is a codec.