JPH11185384A - Recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To output a signal, being inputted by an analog method or a digital method, by the digital method or the analog method. SOLUTION: This device is provided with a digital input/output means 31 for inputing/outputing digital data, a recording/reproducing means 3 performing the recording/reproducing processing for inputted digital data, an expanding means 24 performing the expansion processing of reproduced digital data, a D/A converting means 28 for converting the expanded digital data to an analog signal and an analog outputing means for outputing the analog signal. It is also provided with an analog inputing means 3 for inputing an analog signal and an encoding means 18 performing the compression encoding processing of the analog signal inputted by the analog inputing means 3. By constituting the device like this, a signal inputted by a digital method is reproduced by an analog method and also a signal inputted by the analog method is reproduced by the digital method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for inputting a video signal and / or an audio signal, recording the data as digital data on a recording medium, and reproducing the data as an analog or digital signal.

[0002]

2. Description of the Related Art A recording / reproducing apparatus such as a D-VHS system for recording / reproducing a video signal and an audio signal on / from a recording medium includes an analog input / output terminal and a digital input / output terminal. In such a recording and reproducing apparatus, when an analog signal is input, analog signal processing for recording and reproducing the analog signal is performed. And in this recording and reproducing apparatus,
It is recorded on a recording medium in an analog system.

On the other hand, in this recording / reproducing apparatus, MPEG2
When digital data of a system is input from a digital input / output terminal, for example, an MPEG2 stream is input from a digital broadcast STB (set top box). In this recording / reproducing apparatus, assuming that the compression rate of the input MPEG2 stream is the maximum, the input MPEG2 stream is recorded on the recording medium with the compression rate at the time of input.

[0004]

In the recording / reproducing apparatus as described above, an analog signal and an MPEG2 signal input at an analog input / output terminal for inputting / outputting an analog signal and a digital input / output terminal for inputting / outputting a digital signal are used. The stream is recorded on a recording medium by the analog system and the MPEG2 system. Therefore, the recording medium on which information is recorded by the recording / reproducing apparatus includes an analog signal and an MPEG2
The stream is recorded.

That is, for example, when the analog signal is in the NTSC format, the NTSC format signal and the MPEG format signal are stored in the recording medium of the recording / reproducing apparatus described above.

However, in the above-described recording / reproducing apparatus, an analog video signal is input from an analog input / output terminal and recorded on a recording medium, and when the recorded video signal is reproduced, only the analog video signal is reproduced. Can not do it.

In this recording / reproducing apparatus, an MPEG video signal is input from a digital input / output terminal and recorded on a recording medium.
It can be reproduced only as an EG video signal.

Accordingly, the present invention has been proposed in view of the above-described circumstances, and provides a recording / reproducing apparatus which can reproduce a digital signal even when the signal is recorded on a recording medium as an analog video signal. The purpose is to provide.

Another object of the present invention is to provide a recording / reproducing apparatus which can reproduce an analog data even if it is recorded on a recording medium as digital data of, for example, MPEG.

[0010]

According to the present invention, there is provided a recording / reproducing apparatus for solving the above-mentioned problems, comprising: digital input / output means for inputting / outputting compression-coded digital data; Recording / reproducing means for recording / reproducing data via a recording medium, decompressing means for decompressing digital data reproduced from the recording medium by the recording / reproducing means, and converting the digital data decompressed by the decompressing means into analog signals It is characterized by comprising D / A conversion means and analog output means for outputting an analog signal generated by the D / A conversion means.

In such a recording / reproducing apparatus, the digital data input by the digital input / output means is recorded on the recording medium by the recording / reproducing means, and the digital data recorded on the recording medium is reproduced by the recording / reproducing means to perform D / A. The signal is output as an analog signal by the conversion means by the analog output means.

The recording / reproducing apparatus may include analog input means for inputting an analog signal, and coding means for performing a compression coding process on the analog signal input by the analog input means.

In such a recording / reproducing apparatus, an analog signal is inputted by an analog input means, compression-encoded by an encoding means, converted into digital data, recorded on a recording medium by the recording / reproduction means, and recorded on the recording medium. The digital data is reproduced by the recording / reproducing means and output as digital data by the digital input / output means.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a recording / reproducing apparatus to which the present invention is applied will be described with reference to the drawings.

As shown in FIG. 1, the recording / reproducing apparatus 1 includes an antenna 2 for receiving digital data of an MPEG (Moving Picture Experts Group) system, and an NTS, for example.
An antenna 3 for receiving a C (National Television System Committee) type analog signal, a signal processing circuit 4 for performing signal processing on digital data and analog data received by the antennas 2 and 3, and a host which is a common bus for transmitting information; An interface buffer 6 which mediates the transmission of information between the bus 5 and the signal processing circuit 4 and the host bus 5
HDD (Hard D) equipped with a recording medium on which information is recorded
so-called ATA (AT Attachment) which mediates information transmission between the isk drive 7 and the host bus 5 and the HDD 7.
And an adapter 8.

The host bus 5 is a parallel line transmission line for transmitting information between the components of the recording / reproducing apparatus.

The interface buffer 6 mediates the transmission of an audio and / or visual digital data stream (hereinafter simply referred to as a digital data stream) between the signal processing circuit 4 and the host bus 5. For example, the interface buffer 6 converts the transfer speed of the digital data stream and adjusts the transfer timing. This interface buffer 6
It has a two-bank RAM inside. This two bank RA
M is composed of two RAMs that are alternately switched to adjust the transfer of information.

The HDD 7 is a fixed disk device for recording an input digital data stream. ATA
(AT Attachment) Adapter 5 is connected to host bus 5 and HD
The digital data stream is interposed between the HDD 7 and the D7 to convert the digital data stream between parallel data of the host bus 5 and data in the data format of the HDD 7.

The recording / reproducing apparatus 1 includes a CPU 9 serving as a central processing unit for centrally processing information, a RAM 10 serving as a volatile memory, and a ROM 1 serving as a nonvolatile memory.
And 1.

The CPU 9 is connected to the host bus 5 and performs software control of a series of operations of the information recording method in the recording / reproducing apparatus 1, such as data transfer and control of the HDD 7. Software for activating this series of operations is recorded, for example, in the ROM 11, and is read out and executed as needed. Further, this CPU 9 is provided with a RISC (Reduce
d Instruction Set Computer), which is a reduced instruction set computer in which basic instructions are simplified and the number of instructions is reduced to improve the processing speed.

The RAM 10 is connected to the host bus 5,
This is a volatile memory in which data is temporarily recorded. R
The OM 11 is a nonvolatile memory connected to the host bus 5 and storing predetermined data and software.

The signal processing circuit 4 includes a tuner 15 for inputting a signal via the antenna 3 for receiving an analog video signal and an audio signal, and a tuner 1.
A for converting the video signal input in step 5 into digital data
/ D conversion circuit 16 and NTSC decoder 17 to which a digital video signal is input from A / D conversion circuit 16
And an MPEG2 encoder 18 for inputting a video signal converted to a baseband signal by an NTSC decoder 17
And a multiplexer 19 to which digital MPEG data is input.

The signal processing circuit 4 also receives an A / D conversion circuit 20 to which the audio signal input to the tuner 15 is input, and an audio signal which is digitalized by the A / D conversion circuit 20. An MPEG1 encoder 21 is provided.

The tuner 15 receives, for example, an NTSC signal received by the antenna 3. The tuner 15 receives a video signal and an audio signal received by the antenna 3 and performs detection. The tuner 15 converts the detected video signal into an A / D signal.
The signal is output to the conversion circuit 16 and the audio signal is output to the A / D conversion circuit 20.

The A / D conversion circuit 16 performs A / D conversion processing on the video signal from the video input terminal or the tuner 15 to obtain video data. And the A / D conversion circuit 1
6 outputs NTSC video data to the NTSC decoder 17, for example.

The NTSC decoder 17 receives NTSC video data from the A / D conversion circuit 16. The NTSC decoder 17 performs a decompression process on the input video data to generate a baseband signal.
Then, the NTSC decoder 17 outputs a baseband signal to the MPEG2 encoder 18 via the terminal 1 of the switch 22.

The MPEG2 encoder 18 performs a compression process on the baseband signal from the NTSC decoder 17.
At this time, the MPEG2 encoder performs compression processing on the input baseband signal so as to be digital data of the MPEG2 system. This MPEG2 encoder 1
8 performs encoding processing on the input baseband signal at a predetermined compression ratio so as to be an integral multiple of the logical sector of the recording medium, as described above. That is, the MPEG2 encoder 18 receives the input GOP (Group Of Picture).
And / or compression encoding is performed so that the maximum data value of the I frame is an integral multiple of the logical sector of the recording medium.

Further, the MPEG2 encoder 18
A baseband signal is input from the MPEG2 decoder 24 via the terminal 2 of the switch 22 and the terminal 2 of the switch 26. The MPEG2 encoder 18 also encodes the baseband signal from the MPEG2 decoder 24 at a predetermined compression rate.

On the other hand, the tuner 15 outputs an audio signal among the signals input from the antenna 3 to the A / D conversion circuit 20. The A / D conversion circuit 20 performs A / D conversion processing on the input audio signal to generate audio data. Then, the A / D conversion circuit 20 outputs the audio data to the MPEG1 encoder 21.

The MPEG1 encoder 21 performs a compression process on the audio data from the A / D conversion circuit 20 according to the MPEG1 system, and outputs the result to the multiplexer 19.

The multiplexer 19 multiplexes the video data from the MPEG2 encoder 18 and the audio data from the MPEG1 encoder 21. If the video data is V and the audio data is A, the multiplexer 19 is, for example, a GOP of an MPEG signal.
.. And the time axis is compressed in units of time to create a digital data stream. The multiplexer 19 outputs the digital data stream obtained by the multiplexing process to the interface buffer 6.

The multiplexer 19 receives the digital data stream recorded on the recording medium in the HDD 7 from the interface buffer 6. The multiplexer 19 divides the digital data stream input from the interface buffer 6 into video data and audio data. This multiplexer 1
9 outputs the divided video data to the multiplexer 32 via the terminal 2 of the switch 34 and to the MPEG2 decoder 24 via the terminal 1 of the switch 23. The multiplexer 32 outputs the divided audio data to the multiplexer 32 via the delay circuit 33 and to the MPEG1 decoder 25.

The signal processing circuit 4 includes an antenna 2 for receiving digital data of the MPEG system and an STB
(Set-top box) 30, digital I / F circuit 31, multiplexer 32, and delay circuit 33.

The antenna 2 is, for example, MP
EG type digital data is input. This antenna 2
Uses the received digital data as an RF signal in STB3
Output to 0.

The STB 30 receives and detects digital data from the antenna 2 at the front end. The STB 30 descrambles, for example, the scrambled digital data and outputs the descrambled digital data to the digital I / F circuit 31.

The STB 30 has a digital I / F
Digital data is input from the circuit. This STB30
Has a built-in MPEG decoder. This STB
Reference numeral 30 denotes a digital I / F using this MPEG decoder.
Decoding the digital data from the circuit 31
For example, compressed video data and audio data are decompressed and converted into video signals and audio signals.

The digital I / F circuit 31 has a physical layer / link layer processing circuit, performs signal processing such as conversion processing on digital data from the STB 30, and outputs the digital data to the multiplexer 32.

The digital I / F circuit 31 includes:
Digital data obtained by multiplexing video data and audio data is input from the multiplexer 32.
The digital I / F circuit 31 outputs the digital data to the STB 30.

The multiplexer 32 divides the digital data from the digital I / F circuit 31 into video data and audio data. The multiplexer 32 converts the video data obtained by the division processing into an MPEG signal via a terminal 1 of a switch 34 and a terminal 2 of a switch 23.
2 decoder 24. The multiplexer 32 outputs audio data to the delay circuit 33.

The multiplexer 32 receives video data from the multiplexer 19 via a switch 34 and audio data via a delay circuit 33. Then, the multiplexer 32 multiplexes the input video data and audio data and outputs the multiplexed data to the digital I / F circuit 31.

The delay circuit 33 includes a multiplexer 32
Perform delay adjustment on audio data from The delay circuit 33 performs a delay process so as to adjust the time difference between the input audio data and the video data, and outputs the result to the multiplexer 19.

The delay circuit 33 receives only audio data among the video data and audio data divided by the multiplexer 19. The delay circuit 33 performs a delay adjustment with respect to the video data and outputs audio data to the multiplexer 32.

Further, the signal processing circuit 4 is adapted to convert the video data into an MPEG signal inputted through the terminal 2 of the switch 23.
2 decoder 24 and an MPEG1 decoder 25 to which audio data obtained by division by the multiplexer 19 is input.
And the NTS in which video data decoded by the MPEG2 decoder 24 is input via the terminal 1 of the switch 26.
A C / C encoder 27; a D / A conversion circuit 28 to which data encoded by the NTSC encoder 27 is input;
A D / A conversion circuit 29 to which audio data decoded by the EG1 decoder 25 is input;

The MPEG2 decoder 24 reads out the digital data stream recorded on the HDD 7 by the data transfer software of the CPU 9 and
Video data obtained by division by the multiplexer 19 via the host bus 5 and the interface buffer 6 is input via the terminal 1 of the switch 23. The MPEG2 decoder 24 performs decompression processing on the compressed and input video data. Also, this MPEG2 decoder 24
Video data is input from the multiplexer 32 via the terminal 2 of the switch 23. This MPEG2 decoder 2
4 outputs to the switch 26 video data obtained by subjecting the input video data to decompression processing.

The switch 23 is connected to the terminal 2 when the video data from the multiplexer 32 is input to the MPEG2 decoder 24.
Is input to the MPEG2 decoder 24 so as to be connected to the terminal 1.

The switch 26 is connected to the terminal 2 when outputting video data from the MPEG2 decoder 24 to the switch 22, and is connected to the terminal 1 when outputting video data from the MPEG2 decoder 24 to the NTSC encoder 27. Is controlled as follows.

The NTSC encoder 27 converts the video data decoded by the MPEG2 decoder 24
6 through the terminal 1. The NTSC encoder 27 performs compression processing on the input video data according to the NTSC system and outputs the video data to a D / A conversion circuit 28.

The D / A conversion circuit 28 performs a D / A conversion process on the video data from the NTSC encoder 27 to generate a video signal. The D / A conversion circuit 28
The video signal is output to the video output terminal.

Audio data obtained by division from the multiplexer 19 is input to the MPEG1 decoder 25. The MPEG1 decoder 25 performs a decompression process on the input audio data. The MPEG1 decoder 25 converts the decompressed audio data into D data.
/ A conversion circuit 29.

The D / A conversion circuit 29 performs D / A conversion processing on the audio data from the MPEG1 decoder 25 to obtain an audio signal. Then, the D / A conversion circuit 29 outputs an audio signal to an audio output terminal.

In such a signal processing circuit 4, the HDD 7
When the MPEG digital data received by the antenna 2 is recorded on the recording medium inside, the digital data is first output to the multiplexer 32 via the STB 30 and the digital I / F circuit 31.

Next, the multiplexer 32 divides the input digital data into video data and audio data. The multiplexer 32 outputs the audio data to the delay circuit 33.

In the multiplexer 32, the video data is transferred to the MPE through the switches 34 and 23.
Output to the G2 decoder 24. At this time, the switch 34
Is connected to the terminal 1 and the switch 23 is controlled to be connected to the terminal 2.

Next, the MPEG2 decoder 24 subjects the compressed video data to decompression processing,
The signal is output to the MPEG2 encoder 18 via the switch 22. At this time, the switch 26 is connected to the terminal 2 and the switch 22 is controlled to be connected to the terminal 2.

Next, the MPEG2 encoder 18 performs compression processing on the input video data at a predetermined compression ratio. At this time, the MPEG2 encoder 18 uses the HDD
GOP and / or I picture compression processing is performed at a compression ratio that is an integral multiple of the logical sector of the recording medium in 7.

Next, the audio data subjected to the delay processing by the delay circuit 33 is output to the multiplexer 19 with the timing controlled, and the video data from the MPEG2 encoder 18 is output to the multiplexer 19.
Is output to

Next, the multiplexer 19 multiplexes the input audio data and video data to create a digital data stream, and stores the digital data stream in the HDD 7 via the interface buffer 6, the host bus 5, and the ATA adapter 8. Perform recording on the recording medium. Therefore,
In the recording / reproducing apparatus 1, MPEG data is recorded in logical sector units of a recording medium.

In the recording / reproducing apparatus 1, the HDD 7
When an NTSC analog signal received by the antenna 3 is recorded on a recording medium in the PC, an NTSC analog signal is first output to the tuner 15.

Next, the tuner 15 detects an analog signal from the antenna 3 and outputs a video signal to the A / D conversion circuit 16 and an audio signal to the A / D conversion circuit 20. At this time, the A / D conversion circuit 16 may input a video signal from a video input terminal.
The A / D conversion circuit 20 may input an audio signal from an audio input terminal.

Next, the A / D conversion circuit 16 performs A / D conversion processing on the input video signal to convert the input video signal into video data, which is output to the NTSC decoder 17.

Next, in the NTSC decoder 17, the A / D
The video data from the conversion circuit 16 is subjected to a decompression process,
The video data is output to the MPEG2 encoder 18 as a baseband signal. At this time, the switch 22 is controlled to connect to the terminal 1.

Next, a baseband signal is input to the MPEG2 encoder 18 via the switch 22. The MPEG2 encoder 18 encodes the input baseband signal into MPEG data at a predetermined compression ratio to generate MPEG2 video data. In the MPEG2 encoder 18, the GOP and / or IOP is an integer multiple of the logical sector of the recording medium in the HDD 7.
Encode so that the frame is compressed. Then, the MPEG2 encoder 18 outputs the video data to the multiplexer 19.

On the other hand, the A / D conversion circuit 20 to which the audio signal is input from the tuner 15 performs A / D conversion processing on the audio signal and outputs the audio signal to the MPEG1 encoder 21 as audio data.

Then, in the MPEG1 encoder 21,
The audio data from the A / D conversion circuit 20 is MPEG
Encoding is performed in one system and output to the multiplexer 19.

In the multiplexer 19, the MPE
The video data input from the G2 encoder 18 and the MP
It multiplexes audio data input from the EG1 encoder 21 to generate a digital data stream.

Next, the multiplexer 19 transmits the generated digital data stream to the HDD 7 via the interface buffer 6, the host bus 5, and the ATA adapter 8.
On the recording medium in the box. Therefore, in the recording / reproducing apparatus 1, an MPEG digital data stream is recorded in logical sector units of the recording medium.

When reproducing the digital data stream recorded on the recording medium in the HDD 7, the recording / reproducing apparatus 1 first uses the data transfer software started by the CPU 9 to store the digital data stored in the HDD 7 in logical sector units of the recording medium. Read the data stream. At this time, the CPU 9 may read out the digital data stream stored in the HDD 7 in, for example, various variable-speed playback modes by software control.

Next, in the recording / reproducing apparatus 1, the HDD 7
ATA adapter 8, host bus 5, interface buffer 6
To the multiplexer 19 via the Then, in the multiplexer 19, the input digital data stream is subjected to a division process to obtain video data and audio data.

When the digital data stream recorded on the recording medium is reproduced as digital data, the signal processing circuit 4 converts the video data from the multiplexer 19 through the switch 34 to the multiplexer 3.
2 and outputs the audio data to the multiplexer 32 with the delay adjusted by the delay circuit 33.

Next, the multiplexer 32 multiplexes the input audio data and video data and outputs the multiplexed data to the digital I / F circuit 31. Then, the audio data and the video data are input to the STB 30, and an audio signal,
The signal is a video signal, and variable speed reproduction, seamless reproduction, and nonlinear edit reproduction are performed by software control of the CPU 9, for example.

On the other hand, when the digital data stream recorded on the recording medium is reproduced as an analog signal by the signal processing circuit 4, the multiplexer 19 outputs video data to the MPEG2 decoder 24 via the terminal 1 of the switch 23.

Next, the MPEG2 decoder 24 decodes the video data from the multiplexer 19 and outputs the video data to the NTSC encoder 27 via the terminal 1 of the switch 26.

Next, in the NTSC encoder 27, the MP
The digital data from the EG2 decoder 24 is converted into NTSC video data. The NTSC encoder 27 converts the NTSC video data into a D / A
Output to the conversion circuit 28.

Next, in the D / A conversion circuit 28, the NTSC
The video data from the encoder 27 is subjected to D / A conversion processing and output to a video output terminal as an NTSC video signal.

The multiplexer 19 outputs audio data to the MPEG1 decoder 25. This MP
The EG1 decoder 25 decodes the audio data from the multiplexer 19 and outputs it to the D / A conversion circuit 29.

Next, in the D / A conversion circuit 29, the MPEG
The audio signal from one decoder 25 is subjected to D / A conversion processing and output to an audio output terminal.

Therefore, according to such a recording / reproducing apparatus 1, an analog signal or digital data stream received by the antennas 2 and 3 is converted into an MP2 signal by the MPEG2 encoder.
The digital data can be converted to EG2 digital data and recorded on the HDD 7, and the digital data recorded on the HDD 7 can be reproduced and output from a video output terminal and an audio output terminal as NTSC analog signals.
Therefore, according to the recording / reproducing apparatus 1, it is possible to output a signal input in an analog system as a digital signal, which was not possible in the related art, and to output a signal input in a digital system in an analog system.

According to the recording / reproducing apparatus 1, the MPEG-2 digital data received by the antenna 2
Since the PEG2 decoder 24 decodes the data, encodes it with the MPEG2 encoder 18, and records it on the hard disk, and encodes the analog signal received by the antenna 3 with the MPEG2 encoder 18 and records it on the hard disk. An encoder that performs the encoding process can be shared.

Further, according to the recording / reproducing apparatus 1, the decoder for decoding the digital data which has been compression-encoded and received by the antenna 2 and the decoding processing for reproducing the digital data recorded on the hard disk as an analog signal And an MPEG2 decoder 2
4 can be shared.

[0080]

As described above in detail, according to the recording / reproducing apparatus according to the present invention, digital input / output means for inputting / outputting compression-coded digital data, and digital input / output Recording / reproducing means for recording / reproducing data via a recording medium, decompressing means for decompressing digital data reproduced from the recording medium by the recording / reproducing means, and converting the digital data decompressed by the decompressing means into analog signals Since the apparatus includes the D / A conversion means and the analog output means for outputting the analog signal generated by the D / A conversion means, the digital data input by the digital input / output means is recorded on the recording medium by the recording / reproduction means, The digital data recorded on the recording medium is reproduced by the recording / reproducing means and
It can be output as an analog signal by the analog output means by the / A conversion means.

Further, according to the recording / reproducing apparatus, the analog input means for inputting the analog signal and the coding means for performing the compression coding process on the analog signal input by the analog input means are provided. Means for inputting an analog signal, performing compression encoding by encoding means, converting the digital data into digital data, recording the data on a recording medium by recording / reproducing means, and reproducing the digital data recorded on the recording medium by recording / reproducing means. It can be output as digital data by means.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a recording / reproducing apparatus to which the present invention has been applied.

[Explanation of symbols]

1 recording / reproducing device, 2 antennas, 3 antennas, 4
Signal processing circuit, 18 MPEG2 encoder, 24 M
PEG2 decoder, 30 STB

Claims (5)

[Claims] 1. Digital input / output means for inputting / outputting compression-encoded digital data, recording / reproduction means for recording / reproducing digital data input by the digital input / output means via a recording medium, Decompression means for performing decompression processing on digital data reproduced by the recording and reproduction means from a medium; D / A conversion means for converting digital data decompressed by the decompression means into an analog signal; and generation by the D / A conversion means. A recording / reproducing apparatus comprising: an analog output unit that outputs a converted analog signal. 2. An analog input means for inputting an analog signal, and encoding means for performing compression encoding processing on the analog signal input by the analog input means, wherein the analog signal is input by the analog input means. The data is compressed and encoded by the encoding means to be converted into digital data, and is recorded on a recording medium by the recording and reproducing means. The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing apparatus outputs the data. 3. The apparatus according to claim 2, wherein said encoding means performs a compression encoding process on an analog signal from said analog input / output means and digital data from a digital input / output means using the same encoding method. The recording / reproducing apparatus as described in the above. 4. An encoding means for compressing and encoding an analog signal input by said analog input means, and an encoding means for compressing and encoding digital data input by said digital input / output means. A decompression means for performing decompression processing when digital data reproduced by the recording and reproduction means is output as an analog signal by the analog output means, and a decompression processing for decompressing digital data input by the digital input / output means 3. The recording / reproducing apparatus according to claim 2, wherein the means is shared with the means. 5. A digital camera comprising: a predetermined number of analog input means and analog output means; and a digital input / output means having the same number as the predetermined number, and the decompressing means and the encoding means having the same number as the predetermined number. The recording / reproducing apparatus according to claim 2, wherein the recording / reproducing apparatus is used.