JP2865769B2 - PCM signal reproducing device and recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to reproduction and recording / reproduction / reproduction in which PCM audio and analog audio are simultaneously recorded or reproduced on a magnetic tape or the like, and digital output of a digital audio interface specification is performed. Related to the device.

[Conventional technology]

A conventional apparatus is a PCM described in JP-A-63-171402.
As in the audio recording video tape recorder, PCM audio is subjected to offset 4-phase differential phase modulation (O-QDPSK), and the video signal and FM audio are superimposed on the tracks on the magnetic tape for recording and reproduction. Is shown. In FIG.
Is a head for FM sound, 6 is a head for PCM sound, 7 is a head for video, 8, 9, 10 and 11 are recording changeover switches, 12, 14, 16 and 18 are recording terminals, 13, 15, 17 and 19 are Playback terminal, 20, 22, 24
And 26 are recording amplifiers, and 21, 23, 25 and 27 are reproduction amplifiers.

 Hereinafter, the operation of the present apparatus will be described.

At the time of recording, the analog audio signals input from the analog audio input terminals 46 and 47 are converted into digital recording serial data 35 by the A / D converter 38. Then, the recording serial data 35 passes through the PCM audio processing circuit 31, and is transmitted to the recording amplifier 24.
After that, the terminal 16 and the terminal 10 are communicated by the recording / reproduction switching signal 4 and are recorded on the magnetic tape 2 by the PCM audio head 6.

At this time, as shown in FIG. 3, the PCM audio signal 53, FM
The audio signals 51 and 52 and the video signals 54 and 55 are recorded with different frequency bands and different azimuth angles. The low frequency FM audio signals 51 and 52 are magnetized to the deep part on the magnetic tape, the high frequency video signals 54 and 55 are magnetized only to the surface layer, and the PCM audio signal 53 is magnetized to the middle layer. It is possible to record in.

On the other hand, at the time of reproduction, the signal recorded in the deep portion of the magnetic tape 2 is reproduced by the PCM audio head 6, amplified to a predetermined level by the reproduction amplifier 25, and the PCM audio processing circuit 31
Is converted into the reproduction serial data 36. At this time, since the video signals 54 and 55 have different azimuth angles from the FM audio signals 51 and 52,
Azimuth loss reduces interference. An audio output selection circuit A41 for converting the reproduced serial data 36 into an analog signal 57 by a D / A converter 37, and selecting one of an FM audio signal 56 and a linear track audio signal 89.
Are output to the analog audio output terminals 44 and 45 via.

In addition, a linear track audio is recorded and reproduced in another area by the linear track audio head 3.

On the other hand, in order to output a digital signal, it is known that the signal is modulated and output to a signal of a digital audio interface specification specified by the Japan Electrical Machinery Manufacturers Association Standard CP-340.

In this device, the recording serial data 35 A / D converted by the A / D converter 38 is used for recording, and the reproduction serial data 36 generated by the PCM audio processing circuit 31 is used for reproduction.
By modulating by 39 and outputting as digital output, monitor output during recording and PCM audio output during reproduction are performed.

[Problems to be solved by the invention]

In the above-described conventional apparatus, only digital data reproduced by the PCM signal processing circuit can be selected as a digital output during reproduction. Therefore, when reproducing a tape on which no PCM audio is recorded, or when the PCM audio is normally reproduced. Without
When a process such as mute is performed, nothing is output to the digital output terminal, resulting in a silent state. Therefore, when connecting to a digital amplifier with digital input or another PCM recording / playback device, it is necessary to connect two channels of analog audio in preparation for playback of tapes on which PCM is not recorded, and the functions of the digital audio interface can be fully utilized. However, there is a problem that input switching must be performed on the input side and a connection method becomes complicated. Also,
The function of the PCM recording / reproducing device cannot be sufficiently exhibited only with the analog connection. Especially in the case of VHS standard VTR, PCM audio can be recorded only in S-VHS, so when playing normal VHS standard tape, there is no PCM audio,
Digital output becomes completely unusable.

An object of the present invention is to prevent a digital output from being silenced even when reproducing a tape on which PCM audio is not recorded,
An object of the present invention is to provide a PCM recording / reproducing device capable of outputting audio.

[Means for solving the problem]

To achieve the above object, a PCM audio processing circuit that performs a reproduction process of an audio signal of a PCM signal, an analog audio processing circuit that performs a reproduction process of an audio signal of an analog signal, and a PCM signal recorded on a recording medium PCM to determine if
A signal detection circuit, an A / D converter that converts the output signal of the analog audio processing circuit into a digital signal, and the PCM signal detection of whether the output signal of the PCM audio processing circuit or the output signal of the A / D converter What is necessary is just to provide a first selection circuit for selecting according to the circuit and a digital output circuit for modulating the output signal of the first selection circuit into a signal of a digital audio interface specification.

Also, when monitoring during recording, before the A / D converter, whether to provide a second selection circuit for selecting an analog audio signal input from the outside or the output signal of the analog audio processing circuit, Alternatively, a digital input circuit for demodulating a digital input signal of a digital audio interface specification input from the outside and a third selection circuit for selecting between the output signal of the A / D converter and the output signal of the digital input circuit are provided. Just do it.

[Action]

When reproducing a recording medium on which PCM audio is recorded, the first selection circuit selects an output signal of the PCM audio processing circuit, and the reproduced PCM audio is output from the digital output circuit.

On the other hand, when reproducing a recording medium on which PCM audio is not recorded, the first selection circuit operates according to the PCM signal detection circuit.
By selecting the output signal of the / D converter, a signal obtained by A / D-converting the reproduced analog voice is input to the digital output circuit and digitally output. Generally, in the case of a VTR, it is considered that analog audio is always recorded, so that even when a recording medium on which PCM audio is not recorded is reproduced, audio can always be output from a digital output.

During recording, the second selection circuit selects an externally input analog audio signal, and the first selection circuit selects the output of the A / D converter.
D-converted and then input to the digital output circuit, or
Alternatively, the third selection circuit selects the output signal of the digital input circuit and inputs the digital signal to the digital output circuit via the first selection circuit, whereby the audio signal input from the outside can be digitally output. .

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIG. The figure is a block diagram of a VTR that records and reproduces PCM audio along with video signals using the deep recording method.
42 and a selection circuit C32.

At the time of recording, the analog audio 58 input from the analog audio input terminals 46 and 47 is selected by the selection circuit B42, sent to the A / D converter 38, and converted into the serial data input signal 35. The serial data input signal 35 is sent to the PCM audio processing circuit 31 and simultaneously to the digital output circuit 39 via the selection circuit C32, and the digital audio output terminal 48 outputs monitor audio during recording.

During playback, if PCM audio is recorded first,
Based on the PCM audio detection signal 33 generated by the audio processing circuit 31, the system control 40 determines and outputs a digital output selection signal. This digital output selection signal 34
Accordingly, the selection circuit C32 selects the PCM reproduced serial data 36 and sends it to the digital output circuit 39, so that the PCM audio is output to the digital audio output terminal 48.

If no PCM audio is recorded, the digital output selection signal 34 is switched, the selection circuit B42 selects the analog audio output 59, and the A / D converter 38 A / D converts the analog audio 59. Further, since the selection circuit C32 selects the serial data 35 which is the output of the A / D converter 38, the digital audio output terminal 48
Output the result of A / D conversion of either FM sound or linear track sound.

Specifically, as shown in FIG. 4, the PCM signal detection signal 33 becomes H (high) in the portions a and c where the PCM signal exists, and L (low) in the portion b where the PCM signal does not exist. Similarly, the digital output selection signal 34 also has H
(High) and L (low) in a portion b where there is no PCM signal. The selection circuit C32 A / D converts PCM sound when the digital output selection signal 34 is H (high) and analog sound when L (low).
Digital output can be selected by selecting the converted
The PCM sound 57 is shown at 60 in the parts a and c, and the F is shown at F in the part b.
An A / D converted version of the M audio 56 is output.

As described above, the selection circuit B42 and the selection circuit C32 provide the digital audio output terminal 48 even when reproducing a magnetic tape on which PCM audio is not recorded.
A / D conversion of the FM audio 56 or the linear track audio 89 can be performed and output.

Next, a method of generating the PCM voice detection signal 33 will be described. First, the recording format of PCM audio on a magnetic tape will be described.

As shown in FIG. 5, even data and odd data are sequentially recorded on the magnetic tape 2 in the form of a track 67 composed of 30 blocks each and 150 blocks in total. FIG. 6 shows the contents of one block, which is composed of 35 symbols, and one symbol is composed of 8 bits. The synchronization signal 61 indicates the head of a block, and the block address 62 indicates a block position in one track. In the ID 63, access information, a sampling frequency, and the like are recorded. Parity 64 is equal to block address 62
Exclusive OR of ID63, used to detect the reliability of the reproduced data. Further, in this system, in order to perform error correction at the time of reproduction, a double encoding configuration using a Reed-Solomon code is employed (product code).
The correction and the second error correction are called C2 correction. 65 contains PCM audio data or C2 parity for C2 correction, and as shown in FIG.
-A, PCM audio data 65-b is allocated to the last 24 blocks. 66 is a C1 parity for C1 correction. Further, a portion from the synchronization signal 61 to the parity 64 is called a header 90.

FIG. 7 shows the inside of the PCM audio processing circuit 31.
Is a data bus.

 The operation of this circuit will be briefly described.

At the time of recording, the recording serial data 35 enters the PCM input / output control circuit 78, is stored in the RAM 73, and the RAM address is managed by the RAM address control circuit 79.
Parity 66 and C2 parity 65-a are generated, and header 90
Is added and O-QDPSK modulated by the modulation / demodulation circuit before being output.

At the time of reproduction, the signal demodulated by the O-QDPSK by the modulation / demodulation circuit 68 is used to detect the parity
A check 64 is performed and the result is stored in the RAM 73. The PCM data is corrected by the error correction circuit 72 using the C1 parity 66 and the C2 parity 65-a.
The data sent to the CM input / output control circuit 78 and subjected to uncorrectable data by the error correction circuit 72 are subjected to interpolation or the like and output as reproduced serial data 36.

As a means for generating the PCM detection signal 33, P
Detects a change in the output level of the CM envelope, depends on the number of detection errors of the header 90 due to the parity 64 as shown by a solid line f, depends on the number of detection errors in C1 correction as shown by a dotted line e, or depends on the number of interpolations after C2 correction And so on. In the PCM sound detection circuit, when using the envelope, the PCM sound detection signal 33 is set to H (high) when the reproduction level is equal to or lower than the set value, and is set to L (low) in the following cases.
When using the number of errors due to the parity 64, the C1 parity 66, the C2 parity 65-a, etc., when the number of times is equal to or less than the set value,
The signal 33 is set to H (high), and is set to L (low) in the above case.

The presence or absence of PCM audio recording can be determined by the above method. Also, even if PCM audio is recorded, but the playback state is poor and muting is applied, it is possible to digitally output the analog audio A / D converted by the PCM audio detection signal 33. Become.

Here, another embodiment of the present invention is shown in FIG. This figure omits the selection circuit C32, and instead performs the same operation inside the PCM audio processing circuit 31, and FIG. 9 shows the inside of the corresponding PCMP audio processing circuit 31. I have. PC
A selection circuit D75 is provided in the M input / output control circuit 78, and at the time of recording, a recording signal that has passed through the serial data input circuit 77 is sent to the bus 71 through the PCM data control circuit 74, while the other is The data is output as serial data 36 via a selection circuit D75 and a serial data output circuit 76.

At the time of reproduction, first, when PCM audio is recorded, the signal from the PCM data control circuit 74 is selected in the selection circuit D75 by the digital output selection signal 34, and is output as serial data 36 through the serial data output circuit 76. You.
When PCM audio is not recorded, the digital output selection signal 34 causes the selection circuit D75 to output the serial data input circuit 7
The signal from 7 is selected and output via the serial data output circuit 76. This device does not require an external selection circuit, and is advantageous when a digital output circuit is incorporated in an LSI. The present invention can be easily implemented by, for example, setting the recording / reproduction processing circuit to the reproduction mode and setting the PCM input / output control circuit to the recording mode.

In the above description, the case where the video signal, the PCM audio signal, and the FM audio signal are recorded in three layers has been described.
A method in which sound is frequency-multiplexed and two layers are recorded is also conceivable.

In the case of two-layer recording, those corresponding to FIG. 1 are shown in FIG.
What corresponds to FIG. 8 is shown in FIG.

During recording, the FM audio signal 91 having a low frequency band shown in FIG.
The PCM audio signal 92 having a high frequency band shown in FIG. 3B output from the audio processing circuit 31 is frequency-multiplexed by the multiplexing circuit 85, communicated with the recording amplifier 81, the terminal 80 and the terminal 82, and Recorded on tape 2.

At the time of reproduction, the signal reproduced by the audio head 88 is amplified to a predetermined level by the reproduction amplifier 84, and the low-pass filter
Those passing through 86 extract only low-frequency FM audio components and enter the FM audio signal processing circuit 30, and those passing through the high-pass filter 87 extract only high-frequency PCM audio components and enter the PCM audio processing circuit 31. Other operations are the same as those described above, and the selection circuit B42 and the selection circuit C32
When reproducing a magnetic tape on which M audio is not recorded, the effect that a linear or FM audio is A / D converted and a digital audio is output is exactly the same.

By the way, at present, only three types of sampling frequencies of 32 kHz, 44.1 kHz and 48 kHz are specified for the digital audio interface specified by the Japan Electrical Machinery Manufacturers Association Standard CP-340. Here, a PCM recording / reproducing apparatus having a sampling frequency other than the above three cannot output digital audio. As an example, there is PCM audio in an 8 mm VTR with a sampling frequency of 31.5 kHz. Therefore, a method is conceivable in which analog audio is converted once using any one of the above three sampling frequencies and then output as digital audio.

Figure 12 shows a PCM with a sampling frequency specification outside the digital audio interface standard, as described above.
9 shows an embodiment of the present invention in a recording / reproducing device. This device has a selection circuit B and an A / D converter 38 for digital output,
It is characterized by having an analog input audio A / D converter 91 separately. Here, the analog A / D converter 91 uses the sampling frequency of the system (31.5 kHz for the 8 mm VTR described above).
z), and the digital A / D converter 38 operates at 32 kHz and 44.
It operates at either 1kHz or 48kHz sampling frequency. During recording, use the digital audio output terminal 48 to
C monitor is also possible. At the time of reproduction, digital output is always possible irrespective of the presence or absence of PCM recording, and has the same effect as above.

Although not shown in the figure, the analog input A / D converter 9
There is also a method in which the A / D converter 38 is operated at the sampling frequency of the system during recording and at the sampling frequency of the digital audio interface during reproduction without providing 1, but in this case, REC monitoring cannot be performed from the digital output terminal. .

FIG. 13 shows an embodiment of a reproduction-only device, and the A / D converter 38 and the selection circuit C32 operate in the same manner as described above.
PCM, F depending on the presence or absence of PCM audio as digital output
M and linear can be selected automatically.

There is also a method in which the PCM sound detection signal 33 is used as it is instead of the digital output selection signal 34, whereby the load on the system control 40 can be reduced.

FIG. 14 shows that the user can output an arbitrary voice to a digital output by using a voice output switch. Thus, when PCM audio is recorded, an arbitrary signal of the user can be selected for the digital output. If no PCM sound is recorded, the sound output switch 43
Even if PCM is selected, the digital output selection signal 34 does not select PCM under the control of the system control 40.

Alternatively, there is a method in which an A / D converter is placed immediately after the audio output selection circuit A41 without providing the selection circuit B42, and the output of the A / D converter is input to the selection circuit C32.

In addition, the digital output selection signal 34 is illuminated by an LED or the like and displayed outside the device, so that the user can easily know which of the PCM audio, the FM audio and the linear track audio is being output to the digital output. It becomes possible.

The apparatus having an analog audio input / output terminal has been described above. Hereinafter, an embodiment of the present invention in an apparatus having no analog audio input / output terminal will be described.

FIG. 15 shows an example of a reproduction-only apparatus having only a digital output terminal 48 without an analog audio output terminal. An analog signal reproduced by the analog audio head 93, amplified by the reproduction amplifier 94, and processed by the analog audio signal processing circuit 95.
96 is converted into serial data 103 by the A / D converter 38.
The selection circuit C3 selects which of the serial data 103 and the PCM voice serial data 36 is to be sent to the digital output circuit 39.
I chose in 2. In this way, when PCM audio is recorded, PCM audio can be output to the digital output terminal 48 by A / D conversion of analog audio when PCM audio is not recorded.

FIG. 16 shows a recording / reproducing apparatus having only a digital input terminal 98 and a digital output terminal 48 without an analog audio input / output terminal, and a digital input circuit 97 converts a signal conforming to the digital audio interface standard into a serial data signal. The input signal 35 is converted.

At the time of recording, the digital input signal input from the digital input terminal 98 is demodulated into a serial data input signal 35 by the digital input circuit 97 and sent to the PCM audio processing circuit 31 and, at the same time, sent to the D / A converter 37. . The analog signal 57 output from the D / A converter 37 passes through an analog audio signal processing circuit 95, is amplified by a recording amplifier 102, and is
0, which is recorded on the magnetic tape 2 by the analog audio head 93 through the terminal 99.

At the time of reproduction, the analog signal 96 reproduced by the analog audio head 93 and passed through the analog audio signal processing circuit 95 through the terminals 99 and 101 is converted into serial data 1 by the A / D converter 38.
It is converted to 03 and sent to the selection circuit C32. The selection circuit C32 determines which of the PCM audio serial data 36 and the analog audio serial data 103 is sent to the digital output circuit 39.

As described above, at the time of recording, while the serial data input signal 35 is recorded as PCM audio, the serial data input signal 35 can be D / A converted and recorded as analog audio.

During playback, when PCM audio is recorded, PCM audio is recorded, and when PCM audio is not recorded, A / D converted analog audio is converted to digital output terminal 48.
Can be output to

In the above description, only the reproduced PCM signal is used as the presence or absence of the recording of the PCM signal.
In the VTR with M audio, the PCM audio is recorded only at the time of S-VHS. Therefore, the recording mode and the type of tape are determined from the signal other than the PCM signal, and the PCM audio detection signal 33 is output. You can also.

〔The invention's effect〕

According to the present invention, in a recording / reproducing apparatus that performs simultaneous reproduction of PCM audio and analog audio and performs digital output according to a digital audio interface specification, when reproducing a recording medium on which PCM audio is recorded, PCM audio is reproduced. When reproducing a recording medium that is not recorded, a signal obtained by A / D conversion of analog audio is automatically selected, and at the time of recording, a monitor output of the recorded audio is automatically selected and digitally output.

Therefore, digital amplifiers with digital inputs and other
When connecting to a PCM signal recording / reproducing device, only the digital audio interface needs to be connected, and connection for two channels of analog output is not required, and connection of audio signals can be simplified. Further, the functions of the PCM signal recording / reproducing device and the digital audio interface can be fully utilized.

Further, by providing the digital output selection switch, it is possible to arbitrarily select between PCM audio and analog audio when reproducing a recording medium on which PCM audio is recorded.

By displaying what is selected for the digital output, the source of the digital output can be known from the outside.

[Brief description of the drawings]

FIG. 1 is a block diagram of a VTR using the present invention, FIG. 2 is a block diagram of a conventional device, FIG. 3 is a frequency spectrum diagram of each signal, and FIG. Waveform diagrams showing an example of each signal, FIGS. 5 and 6 are format diagrams showing a recording format on a magnetic tape in the present VTR, FIGS. 8, 10, 11, 14, and 16 of FIG. Is a block diagram showing another embodiment of the recording / reproducing apparatus using the present invention.
FIG. 9 and FIG. 9 are block diagrams showing an example of the PCM audio processing circuit of FIG. 1 and FIG. 8, respectively. FIG. 12 shows an example in which the present invention is applied to a PCM signal recording / reproducing machine not conforming to the digital audio interface standard. FIGS. 13 and 15 are block diagrams showing examples in which the present invention is applied to a playback-only machine. 95: Analog audio signal processing circuit 69: PCM audio recording detection circuit 31: PCM audio processing circuit 32: Selection circuit C 39: Digital output circuit 41: Audio output selection circuit A 42: Selection circuit B 38 …… A / D converter

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukie Usuda 1410 Inada, Katsuta-shi, Ibaraki Prefecture Tokai Plant, Hitachi, Ltd. (56) References JP-A-60-111369 (JP, A) JP-A Sho 62-241409 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G11B 20/00

Claims (17)

(57) [Claims] 1. A reproducing apparatus for performing reproduction processing from a recording medium on which at least two types of audio signals of an analog signal audio signal and a PCM signal audio signal are multiplex-recorded,
An analog audio processing circuit that performs a reproduction process of the analog signal; a PCM signal detection unit that determines whether the PCM signal is recorded on a recording medium; and a PCM audio processing circuit that performs a reproduction process of the audio signal of the PCM signal. A D / A converter that converts a digital signal output from the PCM audio processing circuit into an analog signal using a first sampling frequency; and an output signal of the analog audio processing circuit or the D / A converter. A second selection circuit for selecting whether the output signal is an output signal in accordance with the PCM detection circuit, and converting an output signal of the second selection circuit into a digital signal using a second sampling frequency different from the first sampling frequency An A / D converter and a digital output circuit that modulates the output signal of the above A / D converter into a signal of digital audio interface specification and performs digital output When the PCM detection means determines that the PCM signal is recorded on the recording medium, the second selection circuit selects the output of the D / A converter and records the data by the PCM signal detection means. PCM for media
When it is determined that no signal is recorded, the output of the analog audio processing circuit is selected.
Signal playback device. 2. A recording / reproducing apparatus for recording and reproducing at least two types of audio signals of an analog signal audio signal and a PCM signal audio signal. An analog audio processing circuit that performs a recording process of the input audio signal input from the input means and a reproduction process of the analog signal, a PCM audio processing circuit that performs a recording process and a reproduction process of the audio signal of the PCM signal, and a recording medium. PCM signal detection means for determining whether the PCM signal is recorded, and an audio input circuit for selecting and inputting an audio signal input from the audio input means or a signal output from the analog audio processing circuit A third selection circuit for selecting either the output signal of the PCM audio processing circuit or the output signal of the audio input circuit, and the output signal of the third selection means. A digital output circuit that performs digital output by modulating the signal into a digital audio interface specification signal. When at least the input audio signal input from the audio input means is recorded, the audio input circuit is connected to the audio input means. The input audio signal input from the external device is selected, and the third selection circuit selects the output signal of the audio input circuit, thereby outputting an externally input audio signal from the digital output circuit, When the PCM signal detection means determines that the PCM signal is recorded, the third selection circuit selects the output signal of the PCM audio processing circuit, thereby outputting the output signal of the PCM audio processing circuit. When the PCM signal is output from the digital output circuit and the PCM signal detection means determines that no PCM signal is recorded, There selects the output signal of the analog audio processing circuit,
A PCM signal recording / reproducing apparatus, wherein the third selection circuit selects an output signal of the voice input circuit to output an output signal of the analog audio processing circuit from the digital output circuit. 3. A fourth selection circuit, wherein the audio input circuit selects an output signal of the analog audio processing or an input audio signal input from the audio input means, and an output signal of the fourth selection circuit. 3. The PC according to claim 2, further comprising an A / D converter for converting the audio signal into a digital signal, wherein an output signal of the A / D converter is used as an output signal of the audio input circuit.
M signal recording and playback device. 4. A digital input circuit for demodulating a digital audio signal of a digital audio interface specification input from the outside into a digital signal, and an output signal of the analog audio processing circuit to a digital signal. An A / D converter and a fifth selection circuit for selecting either the output signal of the digital input circuit or the output signal of the A / D converter, wherein the output signal of the fifth selection circuit is output to the audio input circuit. 3. The PCM signal recording / reproducing apparatus according to claim 2, wherein the output signal is an output signal. 5. A sixth selection circuit for selecting between an output signal of said analog audio processing circuit and an input audio signal inputted from said audio input means, wherein an output signal of said sixth selection circuit is supplied to said A / A Input to a D converter, and as an output signal of the audio input circuit, at the time of recording, either an A / D converted signal of an input audio signal input from the audio input means or a signal obtained by demodulating the digital input signal. 5. The PCM signal recording / reproducing apparatus according to claim 4, wherein the PCM signal recording / reproducing apparatus outputs the selected signal and outputs the output signal of the analog audio processing circuit during reproduction. 6. A recording / reproducing apparatus for recording and reproducing at least two types of audio signals of an analog signal audio signal and a PCM signal audio signal, wherein: an audio input means for externally inputting audio; An analog audio processing circuit that performs a recording process of the input audio signal input from the input means and a reproduction process of the analog signal, a PCM audio processing circuit that performs a recording process and a reproduction process of the audio signal of the PCM signal, and a recording medium. PCM signal detection means for determining whether or not the PCM signal is recorded; a voice input circuit for performing input processing of an input voice signal input from the voice input means; and an output signal of the voice input circuit as a first signal. Converted to a digital signal using the sampling frequency,
A first A / D converter for outputting to a voice processing circuit, and a first D / A converter for converting a digital signal output from the PCM voice processing circuit into an analog signal using the first sampling frequency A seventh selection circuit for selecting the output signal of the analog audio processing circuit, the first D / A converter, or the audio input circuit; and outputting the output signal of the seventh selection circuit to the first A second A / D converter for converting into a digital signal using a second sampling frequency different from the sampling frequency of the second A / D converter, and modulating the output signal of the second A / D converter to a signal of a digital audio interface specification And a digital output circuit for performing digital output. At the time of recording, the seventh selection circuit selects the audio processing circuit, and converts the input audio signal input from the audio input means into the second A signal. / D conversion The A / D converted signal is output from the digital output circuit, the time of reproduction, the PC
When the M signal detecting means determines that the PCM signal is recorded, the seventh selection circuit selects the first D / A converter, and outputs the output signal of the PCM signal processing circuit to the first D / A converter.
Output from the digital output circuit through the D / A converter, the seventh selection circuit and the second A / D converter, and determine that the PCM signal is not recorded by the PCM signal detection means. In this case, the seventh selection circuit selects the analog audio processing circuit, and outputs a signal obtained by A / D converting an output signal of the analog audio processing circuit by the second A / D converter to the digital output circuit. PCM characterized by more output
Signal recording / reproducing device. 7. The PCM signal recording / reproducing apparatus according to claim 6, wherein an input audio signal input from said audio input means is used as it is as an output signal of said audio input circuit. 8. A digital input circuit for demodulating a digital input audio signal of a digital audio interface specification input from the outside into a digital signal, and an output signal of the digital input circuit, the digital signal being input to the first sampling circuit. A second D / A converter for converting an analog signal using a third sampling frequency different from the frequency, wherein an output signal of the second A / D converter is an output signal of the audio input circuit. The PCM signal recording / reproducing apparatus according to claim 4, wherein: 9. An eighth selection circuit for selecting from an output signal of the second D / A converter or an analog audio signal inputted from the outside, wherein an output signal of the eighth selection circuit is supplied to the audio input. 9. The PCM signal recording / reproducing apparatus according to claim 8, wherein the output signal is a circuit output signal. 10. The audio signal of the analog signal is at least one of an FM audio signal obtained by FM-modulating the analog audio signal and a linear track audio recorded on a recording medium in an area different from an area where the FM audio is recorded. 2. A PCM signal reproducing apparatus according to claim 1, wherein said apparatus comprises one type. 11. A digital output circuit output selection switch is provided, and the PCM signal detection circuit outputs a P signal to a recording medium.
If it is determined that the CM signal is recorded, the output of the PCM audio processing circuit is output from the digital output circuit or the output signal of the analog audio processing circuit is subjected to A / D conversion by the selection switch. 2. The PCM signal reproducing apparatus according to claim 1, wherein the apparatus selects whether the digital signal is output from the digital output circuit. 12. An output of the digital output circuit,
2. The method according to claim 1, further comprising displaying which of an output signal of the PCM audio processing circuit and a signal obtained by performing A / D conversion on the output signal of the analog audio processing circuit is selected. PCM signal playback device 13. An output of the digital output circuit,
The audio signal input from the outside, the output signal of the PCM audio processing circuit, and the output signal of the analog audio processing circuit
7. The PCM signal recording / reproducing apparatus according to claim 2, wherein which of the signals subjected to A / D conversion is selected is displayed externally. 14. An output signal of the PCM audio processing circuit, a signal obtained by A / D conversion of the FM audio signal, and a signal obtained by A / D conversion of the linear track audio signal are output from the digital output circuit. 11. The PCM signal recording / reproducing apparatus according to claim 10, wherein whether the processing is performed is displayed externally. 15. An audio signal of the analog signal is at least one of an FM audio signal obtained by FM-modulating the analog audio signal and a linear track audio recorded on a recording medium in an area different from an area where the FM audio is recorded. 7. The PCM signal recording / reproducing apparatus according to claim 2, wherein the apparatus comprises one type. 16. A digital output circuit, comprising: a switch for selecting an output of the digital output circuit;
If it is determined that the CM signal is recorded, the output of the PCM audio processing circuit is output from the digital output circuit or the output signal of the analog audio processing circuit is subjected to A / D conversion by the selection switch. 7. The PCM signal recording / reproducing apparatus according to claim 2, wherein a selection is made as to whether the digital signal is output from the digital output circuit. 17. An output of the digital output circuit,
3. An externally displayed signal as to which of an output signal of the PCM audio processing circuit and a signal obtained by performing A / D conversion on an output signal of the analog audio processing circuit is selected. Item 7. The PCM signal recording / reproducing device according to Item 6.