JP3293600B2 - Digital information recording / reproducing apparatus, reception recording / reproducing apparatus and method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to receiving digital information.
Transmission and recording / reproducing devices, especially bit-compressed
Receiving digital information that has been adjusted and transmitted, and recording / reproducing
Digital information recording / reproducing device, receiving recording / reproducing device,
And its method.

[0002]

2. Description of the Related Art Conventionally, information signals are compressed, modulated and transmitted.
And for the device that receives the transmitted signal,
For example, it is described in JP-A-63-28143.
In this publication, packet transmission technology is adopted,
Broadcast in a short time, and the receiving side
A technique is described in which the data is expanded and played back for listening.

[0003]

However, bit compression is not possible.
Receive the modulated and transmitted digital information, and
Information recording / reproducing apparatus for recording / reproducing to / from reception and receiving information
No consideration is given to the recording / reproducing device.

It is an object of the present invention to provide a bit-compressed and modulated
Receiving the digital information transmitted by the
The rationalization and reduction of the circuit scale
Digital information recording / reproducing device, reception recording / reproducing device, and
The purpose is to provide a method.

[0005]

In order to achieve the above object, the present invention has the following constitution. A digital information recording / reproducing device connectable to a receiving device, wherein the receiving device has different video information and audio information from outside the receiving device.
A bit compressed by compression method the compressed video information and audio
Receiving bit-compressed digital information transmitted by adding a common transmission parity signal for error correction to the information, performing error correction based on the transmission parity signal, and outputting the bit-compressed digital information as being bit-compressed And an input unit to which the bit-compressed digital information output from the receiving device is input, and to the video information and the audio information different from the transmission parity signal in the bit-compressed digital information from the input unit. Parity signal adding means for adding a common recording parity signal, recording means for recording bit-compressed digital information to which a parity signal has been added by the parity signal adding means on a recording medium, and bit-compressed digital information recorded on the recording medium. Reproducing means for reproducing information; and a bit-compressed digital signal reproduced by the reproducing means. The error of the broadcast, and video information and audio information
Error correction means for correcting based on the recording parity signal common to the , separating the bit compressed digital information corrected by the error correction means into video information and audio information,
Bit expansion means for expanding bits to uncompressed digital information in different formats corresponding to the respective compression methods is provided, and the bit-compressed digital information input to the input section is recorded as being bit-compressed. A digital information receiving / recording / reproducing apparatus for receiving and recording / reproducing digital information.
Are bit-compressed by different compression methods , and the compressed video
Receiving means for receiving bit-compressed digital information transmitted by adding a common transmission parity signal for error correction to information and voice information; error correction means for performing error correction based on the transmission parity signal; A parity signal adding means for adding a common recording parity signal to the video information and the audio information different from the parity signal, and the bit-compressed digital information to which the parity signal has been added by the parity signal adding means is recorded on a recording medium. and recording means, reproducing means for reproducing the bit compressed digital information recorded on the recording medium, the error bit compressed digital information reproduced by said reproducing means, video information and audio
Error correcting means for correcting based on the recording parity signal common to the information, and the bit-compressed digital information corrected by the error correcting means is divided into video information and audio information.
And bit expansion means for expanding the bits of uncompressed digital information in a different format corresponding to the compression system, and recording the received bit-compressed digital information in a bit-compressed state.

A digital information receiving / recording / reproducing method for receiving and recording / reproducing digital information, comprising the steps of:
Video information and audio information are bit-compressed using different compression methods.
Receiving bit-compressed digital information transmitted by adding a common transmission parity signal for error correction to the compressed video information and audio information , and converting the bit-compressed digital information based on the transmission parity signal; Error correction, and the bit-compressed digital information after the error correction is shared by the video information and the audio information different from the transmission parity signal.
Recording adds a parity signal, the added bit compressed digital information of the recording parity signal recorded in a recording medium in a state of being bit compressed at the input, reproducing the recorded bit compressed digital information, the Errors in the reproduced bit-compressed digital information can be determined by
And correcting the corrected bit-compressed digital information with video information and audio.
Voice information, and separate them according to the compression method.
Bit expansion is performed on uncompressed digital information in the following manner .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. In FIG. 1, 1 and 40 are magnetic tapes, 2, 3, 41 and 42 are magnetic heads, 4 and 43 are cylinders, 5 and 44 are capstans, 10 and 50 are servo control circuits, and 20, 31, and 60 are demodulations. Circuits 21, 32, 6
1 is an error correction circuit, 22 and 23 are compression circuits, and 24 and 33
Is a parity addition circuit, 25 and 34 are modulation circuits, 26 is a transmission circuit, 27 is a transmission line, 30 is a reception circuit, 62 and 63 are expansion circuits, 64 and 65 are D / A conversion circuits, and 70 is a video signal output. A terminal 71 is an audio signal output terminal.

First, the operation of the transmission signal processing device will be described. The digital video signal and the audio signal recorded on the magnetic tape 1 are reproduced by the magnetic heads 2 and 3 mounted on the cylinder 4 and input to the demodulation circuit 20. The magnetic tape 1 runs on the capstan 5. Magnetic tape 1
, And the rotational frequency of the cylinder 4 are, for example, 10 times the normal speed. Therefore, the signal input to the demodulation circuit 20 is time-compressed ten times. For example, if a signal for 120 minutes is recorded on the magnetic tape 1,
It can be played in 12 minutes.

[0009] In general, when recording digital signals on a magnetic recording medium, scrambled NRZ, it is recorded after being modulated such as M ² code. The demodulation circuit 20 performs signal processing for returning the modulated signal to the original digital data, that is, demodulation. Demodulation circuit 20
The signal demodulated in step (1) is input to an error correction circuit 21, which detects and corrects erroneous data in a magnetic recording / reproducing process. The video signal and the audio signal are separated and input to the compression circuits 22 and 23, respectively. The video signal is bit-compressed by, for example, discrete cosine transform. The audio signal is bit-compressed by, for example, non-linear quantization, differential PCM, or the like. As a result, the transmission rate of the total of the video signal and the audio signal is reduced to, for example, 1/20.

The output signals of the compression circuits 22 and 23 are input to a parity addition circuit 24 which performs signal processing such as adding a parity signal for error correction and outputting a video signal and an audio signal serially in accordance with a transmission format. Is done. The output signal of the parity adding circuit 24 is input to the modulation circuit 25. The modulation circuit 25 modulates the serial signal according to the characteristics of the transmission path 27 and the frequency band. For example, when transmitting by radio waves, modulation is performed by four-phase phase modulation (QPSK). The modulated signal is input to the transmission circuit 26 and output to the transmission path 27.

The above is the description of the operation of the transmission signal processing apparatus. In this way, signals can be transmitted at a speed ten times that of a normal signal.

In the above embodiment, the case where a signal is reproduced from the VTR has been described. However, the signal source is not limited to the VTR, and may be any of a magnetic disk device, an optical disk device, and the like.

Next, the operation of the VTR for receiving and recording the transmitted signal will be described. The signal transmitted from the transmission signal processing device is received by the receiving circuit 30. The received signal is input to the demodulation circuit 31. The demodulation circuit 31 corresponds to the modulation circuit 25 and demodulates the original signal. The demodulated signal is input to an error correction circuit 32, and based on the parity added by the parity addition circuit 24, detects and corrects an error generated in the transmission path 27. At this time, if the S / N of the transmission system is insufficient and the error cannot be corrected, the correction is performed by replacing the signal using the correlation of the signal.

The output signal of the error correction circuit 32 is input to a parity addition circuit 33. The parity adding circuit 33 adds a parity for detecting and correcting an error occurring in the process of recording and reproducing. The signal to which the parity is added is input to the modulation circuit 34. The modulation circuit 34 modulates to a code suitable for magnetic recording. For example, the above-mentioned, scrambled NRZ, a M ² code or the like. The modulated signal is supplied to magnetic heads 41 and 42 mounted on a cylinder 43.
Is recorded on the magnetic tape 40.

At this time, the signal is time-axis-compressed to 10 times the normal time. Therefore, the servo control circuit 50 controls the rotation frequency of the cylinder 43 and the traveling speed of the magnetic tape 40 to 10 times the normal time. The rotation of 43 and the control of the capstan 44 are performed. Further, in order to record a predetermined signal at a predetermined position on the magnetic tape 40, synchronization information is detected from the received signal, and the rotation phase of the cylinder 41 is controlled based on the synchronization information.

Next, the operation of the VTR for reproducing the signal thus recorded will be described. During playback,
The running speed of the magnetic tape 40 and the rotation frequency of the cylinder 43 are assumed to be normal reproduction. The reproduced signal is input to the demodulation circuit 60. The demodulation circuit 60 includes the modulation circuit 34
And demodulates and outputs the modulated signal. The demodulated signal is input to an error correction circuit 61, which detects and corrects an error generated in the magnetic recording / reproducing system based on the parity added by the parity adding circuit 33. Further, if there is an error that cannot be corrected, the error is corrected using the correlation of the signal as appropriate. In addition, the video signal and the audio signal are separated and output.

The video signal is input to a decompression circuit 62.
The expansion circuit 62 corresponds to the compression circuit 22,
The compressed video signal is restored by the decompression circuit 62 to the original video signal. The output signal is input to the D / A conversion circuit 64, converted from digital to analog video signal, and output from the terminal 70.

The audio signal is input to a decompression circuit 63.
The expansion circuit 63 corresponds to the compression circuit 23,
The compressed audio signal is restored to the original audio signal by the expansion circuit 63. The output signal is input to the D / A conversion circuit 65, converted from digital to analog audio signals, and output from the terminal 71.

As described above, an embodiment of the present invention has been shown and its operation has been described. According to the present invention, a long-term video signal and audio signal can be transmitted and recorded in a short time, and a digital VTR can be recorded. Can expand the range of use.

FIG. 2 shows another embodiment of the present invention. FIG.
Are partially the same as those in FIG. 1, and the same portions are denoted by the same reference numerals and detailed description thereof will be omitted. The embodiment shown in FIG. 2 relates to a VTR capable of recording while monitoring a signal transmitted and received at high speed.

In FIG. 2, reference numeral 80 denotes a changeover switch, 81
Is an error correction circuit, and 82 is a memory circuit. The error-corrected video signal output from the error correction circuit 81 is input via the memory circuit 82 to the terminal R selected when the changeover switch 80 records. The memory circuit 82 has a memory capacity of at least one field, stores video signals received at a high speed in the memory frame by frame, reads out the video signals from the memory at a regular speed, and inputs the video signals to the decompression circuit 62.

At the time of reproduction, the output video signal of the error correction circuit 61 is supplied to a terminal P selected at the time of reproduction of the changeover switch 80.
Input to the side. Therefore, at the time of reproduction, the operation is the same as in the embodiment shown in FIG.

In the embodiment shown in FIG. 2, during recording, the video signal output from the error correction circuit 81 is transferred to a memory circuit 82.
, The output signal of the modulation circuit 34 is output to the demodulation circuit 60 via a memory circuit.
May be input. If the demodulation circuit 60 and the error correction circuit 61 have sufficient operating speed, a memory circuit may be appropriately provided afterward, or the memory capacity of the error correction circuit 61 and the decompression circuit 62 may be sufficient. If it is used, the memory circuit may be omitted.

As described above, according to the embodiment shown in FIG. 2, although the picture is a frame-by-frame picture, it is possible to record while monitoring the received video signal.

In the embodiment shown in FIG. 1, a parity is added in order to detect or correct an error occurring in the transmission system or the magnetic recording / reproducing system. As an example of the method of adding parity, D
FIG. 3 shows the case of a two-format VTR. D2
In the format VTR, a signal of one field is divided into a plurality of segments for signal processing.
One of the segments is shown.
In FIG. 3, 90 is a video data group, 91 is an outer code parity group, and 92 is an inner code parity group. First, an outer code parity is added to the data of the video data group 90 arranged in a matrix in the figure in the vertical direction. Thereafter, the video data group 90 and the outer code parity group 9
In FIG. 1, a recording signal is generated in such a manner that an inner code parity is added to data arranged in the horizontal direction. The generation of the parity is not described in detail here, but is generated according to a generating polynomial G (x).

In the embodiment shown in FIG.
If the method of generating parity is the same in 4, 33,
Most of the error correction circuits 32 and 61 can be shared. That is, since the error correction circuits 32 and 61 are used at the time of recording and at the time of reproduction, respectively, the circuit scale can be reduced by sharing them.

Further, in the embodiment shown in FIG. 1, when the parity generating circuits 24 and 33 use the same parity generation method, the circuit scale of the recording / reproducing apparatus can be further reduced. FIG. 4 shows an embodiment in that case. FIG. 4 is partially common to FIGS. 1 and 2, and the common parts are denoted by the same reference numerals and detailed description thereof will be omitted.

The concept of the embodiment shown in FIG. 4 is to simultaneously detect and correct an error occurring in the transmission system and an error occurring in the magnetic recording / reproducing system by the error correcting circuit 61 of the reproducing system. Therefore, the signal received by the receiving circuit 30 is demodulated by the demodulation circuit 31 and input to the modulation circuit 34 without error correction or parity addition. The subsequent processing is the same as the embodiment shown in FIG. 1 or FIG.
The reproduced signal is demodulated by the demodulation circuit 60 and then input to the error correction circuit 61. As described above, the error correction circuit 61 detects and corrects an error occurring in the transmission system and an error occurring in the magnetic recording / reproducing system at the same time in the error correcting circuit 61 of the reproducing system.

The embodiment shown in FIG. 4 is different from the embodiment shown in FIGS. 1 and 2 in that the error correction circuit 32 and the parity addition circuit 3
3 can be eliminated, and the circuit scale can be reduced.

Although not described in the above embodiment, in such a helical scan type VTR, since a signal is discontinuous when a track is jumped during reproduction, an amble signal is added to the head of the signal. Have recorded. Since the addition of the amble signal is also performed in the D2 format VTR, its detailed description is omitted. In order to determine the start position of the signal, a synchronizing signal is appropriately added. However, since a synchronizing signal is also known, for example, in a D2 format VTR, its detailed description is omitted.

In the embodiment shown in FIG. 1, it can be considered that the addition of the amble signal is performed by the parity adding circuit 24. Alternatively, in order to increase the use efficiency of the transmission path 27, the recording and reproduction can be performed on the recording and reproducing apparatus side. Also in this case, the addition of the amble signal may be considered to be performed by the parity adding circuit 33. In the embodiment shown in FIG. 4, when the amble signal is added on the recording / reproducing apparatus side, it may be considered that the amble signal is simultaneously performed by the modulation circuit 34. If the addition of the amble signal is performed on the recording / reproducing apparatus side, the use efficiency of the transmission path 27 can be improved.
When transmitting a signal to the TR, the price of the VTR can be reduced, and the effect can be enhanced.

FIG. 5 shows a further reduction in the circuit size of the VTR on the receiving side when signals are sent to many VTRs at the same time.
That is, this is another embodiment of the present invention capable of reducing the price.

FIG. 5 is partially common to FIGS. 1, 2 and 4, and the common parts are denoted by the same reference numerals and the detailed description thereof will be omitted. In FIG. 5, reference numeral 100 denotes a modulation circuit. The idea of the present embodiment is that signal processing required at the time of VTR recording is performed on the transmission side. That is, modulation suitable for magnetic recording and reproduction, for example, signal processing corresponding to the modulation circuit 34 shown in FIG. 4 is performed on the transmission signal processing device side. After the parity is added by the parity addition circuit 24 of the transmission signal processing device, the modulation suitable for magnetic recording and reproduction is performed by the modulation circuit 100.
Do with. After that, modulation suitable for transmission is performed by the modulation circuit 25. As a modulation method performed by the modulation circuit 100, a method, such as a scrambled NRZ, in which a frequency band is not widened by modulation is suitable. Modulation circuit 25
1 is transmitted to the transmission line 27 via the transmission circuit 26, as in the embodiment shown in FIG.

The signal received by the receiving circuit 30 via the transmission line 27 is demodulated by the demodulation circuit 31 corresponding to the modulation circuit 25. The signal demodulated by the demodulation circuit 31 already has
Since modulation suitable for magnetic recording and reproduction is performed by the modulation circuit 100, the data is directly recorded on the magnetic tape 40 by the magnetic heads 41 and 42. In this state, the same recording as that of the embodiment shown in FIG. 4 has been performed, and the operation at the time of reproduction is the same as that of the embodiment shown in FIG.

As described above, according to this embodiment,
The circuit scale of the VTR can be significantly reduced.

As mentioned above, as an application of the present invention, it is possible to transmit signals from a transmission signal processing device to a large number of VTRs simultaneously and at high speed via a transmission line. At this time,
It is difficult to control a large number of VTRs at the same time, and further, it is necessary to perform control such as recording on any VTR and not recording on any VTR. The technology for realizing such control is described below.

For this purpose, a control signal is transmitted before transmitting a signal to be recorded. FIG. 6 shows an example of the control signal. In FIG. 6, reference numeral 110 denotes a synchronization signal, 111 denotes an ID signal indicating what kind of control is performed, and 112 denotes which VT
Address signal 113 indicating whether to control R
Is a control signal for setting the VTR designated by the address signal 112 to the recording mode, 114 is a control signal for stopping recording, 115 and 116 are blank signals, and 120 is a signal to be actually recorded.

At a predetermined position with respect to the synchronization signal 110,
Address signal 1 indicating on which VTR the signal is to be recorded
An ID signal 111 indicating that the VTR 12 is to be transmitted is transmitted, and each VTR is set to a standby state. When all the address signals have been transmitted, the ID signal 113 is transmitted, and recording of the signal 120 is started by the designated VTR. After transmitting the signal 120, an ID signal 114 for controlling recording stop is transmitted. The signals 115 and 116 are blank signals, and have no meaning in the signals for matching the signal transmission format with the other parts.

In the embodiments shown in FIGS. 1 and 5, these control signals are generated by the control signal generating circuit 130, and the parity adding circuit 24 adds a parity for correcting an error occurring during transmission and transmits the control signal.

In the VTR shown in FIG. 1, a signal is received by a receiving circuit 30, demodulated by a demodulating circuit 31, and an error generated during transmission is corrected by an error correcting circuit 32. Thereafter, a control circuit 131 detects a control signal. Controls recording and playback of the recording and playback device.

In the case of the VTR shown in FIGS. 4 and 5, since it is necessary to correct an error occurring during transmission, the output signal of the demodulation circuit 31 is input to the error correction circuit 61, and the error-corrected control signal is transmitted. Input to the control circuit 131. The switching circuit 132 is connected to the terminal R for selecting the output signal of the demodulation circuit 31 during recording, and the P side for selecting the output signal of the demodulation circuit 60 is selected for reproduction.

As described above, a large number of VTRs can be selectively and simultaneously controlled by using this embodiment.

As described in the embodiment shown in FIG. 2, by using the switching circuit 132 and the memory circuit,
It is possible to monitor the recording of individual frames.

[0044]

As described above, according to the present invention,
Receiving the transmitted bit-compressed digital information,
When recording / reproducing, recording with bit compression at the time of transmission
Since it is played back, the bit is expanded and recompressed on the way.
Means can be omitted, and the circuit scale can be reduced.
This has the effect.

[Brief description of the drawings]

FIG. 1 is a block diagram of a digital transmission signal processing device and a recording / reproducing device showing an embodiment of the present invention.

FIG. 2 is a block diagram of a recording / reproducing apparatus showing another embodiment of the present invention.

FIG. 3 is a diagram showing a conventional parity adding method.

FIG. 4 is a block diagram of a recording / playback apparatus showing another embodiment of the present invention.

FIG. 5 is a block diagram of a digital transmission signal processing device and a recording / reproducing device showing an embodiment of the present invention.

FIG. 6 is a diagram of a control signal showing an embodiment of the present invention.

[Explanation of symbols]

 21, 32, 61: error correction circuit, 22, 23: compression circuit, 24: parity addition circuit, 25, 100: modulation circuit, 31: demodulation circuit, 62, 63: decompression circuit, 82: memory circuit, 130: control Signal generation circuit, 131 ... control circuit

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Keizo Nishimura 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Home Appliance Research Laboratory, Hitachi, Ltd. (72) Inventor Yuzumi Watani 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock Shares (72) Inventor Akira Shibata 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Hitachi, Ltd. Consumer Electronics Laboratory (56) References JP-A-2-44826 (JP, A) JP-A Sho-64 -73560 (JP, A) JP-A-1-114176 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/91-5/956 G11B 20/10-20/12 G11B 20/18 H04N 7/24-7/68

Claims (19)

(57) [Claims] 1. A digital information recording / reproducing device connectable to a receiving device, wherein the receiving device is configured to receive video information and audio from outside the receiving device.
The information is bit-compressed with different compression methods , and the compressed
Receives bit-compressed digital information transmitted by adding a common transmission parity signal for error correction to video information and audio information, performs error correction based on the transmission parity signal, and compresses the bit-compressed digital information. to output the result remains an input unit for bit compressed digital information outputted from said receiving apparatus is input, the bit compressed digital information from the input unit, the transmitting parity signal and different from the image information The audio information
A parity signal adding unit that adds a common recording parity signal to the recording device; a recording unit that records bit-compressed digital information to which a parity signal has been added by the parity signal adding unit on a recording medium; and bits recorded on the recording medium. Reproducing means for reproducing the compressed digital information; error correcting means for correcting an error of the bit-compressed digital information reproduced by the reproducing means based on the recording parity signal common to video information and audio information; The bit-compressed digital information corrected by the correction means is separated into video information and audio information.
Bit expansion means for expanding bits to uncompressed digital information by a different method corresponding to a compression method , wherein the bit-compressed digital information input to the input section is recorded as being bit-compressed. Playback device. 2. Video information and audio information are bit-compressed by different compression methods , and the compressed video information and audio information are transmitted with a common transmission parity signal for error correction added thereto. an input unit for bit compressed digital information corrects errors based on the transmission parity signal is input, the bit compressed digital information from the input unit, the voice information different from the video information and the transmission parity signal
A parity signal adding unit that adds a common recording parity signal to the recording device; a recording unit that records bit-compressed digital information to which a parity signal has been added by the parity signal adding unit on a recording medium; and bits recorded on the recording medium. Reproducing means for reproducing the compressed digital information; error correcting means for correcting an error of the bit-compressed digital information reproduced by the reproducing means based on the recording parity signal common to video information and audio information; The bit-compressed digital information corrected by the correction means is separated into video information and audio information.
Bit expansion means for expanding bits to uncompressed digital information by a different method corresponding to a compression method , wherein the bit-compressed digital information input to the input section is recorded as being bit-compressed. Playback device. 3. A digital information recording / reproducing device connectable to a receiving device, wherein said receiving device is provided with video information and audio from outside the receiving device.
The information is bit-compressed with different compression methods , and the compressed
Receiving bit-compressed digital information transmitted by adding a common first parity signal for error correction to video information and audio information, performing error correction based on the first parity signal, and converting the bit-compressed digital information to output the result remain bit compression, an input unit bit compressed digital information outputted from said receiving apparatus is input, the bit compressed digital information from the input unit, said different from said first parity signal Video information and audio information
Parity signal adding means for adding a common second parity signal bets, recording means for recording additional bit compressed digital information of said second parity signal to the recording medium by the parity signal adding means, on the recording medium Reproducing means for reproducing the recorded bit-compressed digital information; and error correction for correcting an error of the bit-compressed digital information reproduced by the reproducing means based on the second parity signal common to video information and audio information. Means , separating the bit-compressed digital information corrected by the error correction means into video information and audio information,
Bit expansion means for expanding bits to uncompressed digital information by a different method corresponding to a compression method , wherein the bit-compressed digital information input to the input section is recorded as being bit-compressed. Playback device. 4. A digital information receiving / recording / reproducing apparatus for receiving and recording / reproducing digital information, wherein video information and audio information are externally bit-compressed by different compression systems , and the compressed video information and audio information are Receiving means for receiving bit-compressed digital information to which a common transmission parity signal for error correction is added and transmitted, error correction means for performing error correction based on the transmission parity signal, and different from the transmission parity signal The video information and the sound
Parity signal adding means for adding a common recording parity signal to voice information; recording means for recording bit-compressed digital information to which a parity signal has been added by the parity signal adding means on a recording medium; and recording means for recording on the recording medium. Reproducing means for reproducing the bit-compressed digital information, and error correcting means for correcting an error in the bit-compressed digital information reproduced by the reproducing means based on the recording parity signal common to video information and audio information . The bit-compressed digital information corrected by the error correction means is separated into video information and audio information.
A digital information receiving / recording / reproducing apparatus, comprising: bit expansion means for expanding bits of uncompressed digital information by a different method corresponding to a compression method , wherein the received bit-compressed digital information is recorded as being bit-compressed. 5. A recording and reproducing method of the receiving apparatus and can be connected to the digital information recording and reproducing apparatus, said receiving apparatus, audio and video information from an external of the receiving device
The information is bit-compressed with different compression methods , and the compressed
Receives bit-compressed digital information transmitted by adding a common transmission parity signal for error correction to video information and audio information, performs error correction based on the transmission parity signal, and compresses the bit-compressed digital information. The bit-compressed digital information output from the receiving device is input, and the input bit-compressed digital information is shared with the video information and the audio information different from the transmission parity signal.
The recorded compressed parity signal is recorded in a bit-compressed state at the time of the input on a recording medium, and the bit-compressed digital information is reproduced from the recording medium. Error of the reproduced bit-compressed digital information
Correcting based on the recording parity signal common to image information and audio information, the corrected bit-compressed digital information is referred to as video information.
Separated into audio information, each corresponding to the compression method
A digital information recording / reproducing method characterized in that bits are expanded into uncompressed digital information by different methods. 6. A digital information receiving / recording / reproducing method for receiving and recording / reproducing digital information, wherein video information and audio information are externally bit-compressed by different compression methods , and the compressed video information and audio information are Receiving bit-compressed digital information to which a common transmission parity signal for error correction has been added and transmitting the error-corrected bit-compressed digital information based on the transmission parity signal; Information, the video information and the audio information different from the transmission parity signal
And a bit-compressed digital information to which the record parity signal has been added is recorded on a recording medium in a bit-compressed state at the time of input, and the recorded bit-compressed digital information is reproduced. The error of the reproduced bit-compressed digital information is
Correcting based on the recording parity signal common to image information and audio information, the corrected bit-compressed digital information is referred to as video information.
Separated into audio information, each corresponding to the compression method
A digital information receiving / recording / reproducing method, wherein bits are expanded into uncompressed digital information by different methods. 7. The digital information recording / reproducing apparatus according to claim 1, wherein the bit information is modulated by the parity signal adding means, and the reproducing means reproduces the bit-compressed digital information. Demodulating means for demodulating the compressed bit-compressed digital information, wherein the recording means records the bit-compressed digital information modulated by the modulating means, and the error correcting means comprises a bit demodulated by the demodulating means. A digital information recording / reproducing apparatus for correcting an error in compressed digital information. 8. The digital information recording / reproducing apparatus according to claim 3, wherein the bit information is modulated by the parity signal adding means to modulate the bit-compressed digital information to which the second parity signal has been added. Demodulation means for demodulating the bit-compressed digital information, wherein the recording means records the bit-compressed digital information modulated by the modulation means, and the error correction means comprises a bit-compression demodulated by the demodulation means. A digital information recording / reproducing device for correcting an error in digital information. 9. The digital information recording / reproducing apparatus according to claim 7, wherein the transmitted bit-compressed digital information is modulated using a phase modulation method, and the modulating means includes: Bit-compressed digital information
Digital information recording and reproducing apparatus characterized by modulating with a modulation scheme that is different from the phase modulation system. 10. A digital information receiving / recording / reproducing apparatus according to claim 4, wherein said parity signal adding means modulates the bit-compressed digital information to which said recording parity signal has been added; Demodulating means for demodulating the bit-compressed digital information, wherein the recording means records the bit-compressed digital information modulated by the modulation means, and the error correction means comprises a bit-compressed digital signal demodulated by the demodulation means. A digital information receiving / recording / reproducing device for correcting an information error. 11. The digital information receiving / recording / reproducing apparatus according to claim 10, wherein said transmitted bit-compressed digital information is modulated by using a phase modulation method, and said transmitted bit-compressed digital information is Demodulating means for demodulating the bit-compressed digital information.
Digital information receiving recording and reproducing apparatus characterized by modulating with a modulation scheme that is different from the phase modulation system. 12. The digital information recording / reproducing method according to claim 5, wherein the bit compressed digital information to which the recording parity signal is added is modulated, and the modulated bit compressed digital information is recorded on a recording medium. A digital information recording / reproducing method comprising demodulating bit-compressed digital information reproduced from a medium, and correcting an error of the demodulated bit-compressed digital information. 13. The digital information recording / reproducing method according to claim 12, wherein the transmitted bit-compressed digital information is modulated by using a phase modulation system, and the recorded bit-compressed digital information is , digital information recording and reproducing method characterized by being modulated with the modulation scheme that is different from said phase <br/> modulation scheme. 14. The digital information receiving / recording / reproducing method according to claim 6, wherein the bit compressed digital information to which the recording parity signal is added is modulated, and the modulated bit compressed digital information is recorded on a recording medium. A digital information receiving / recording / reproducing method which demodulates bit-compressed digital information reproduced from a recording medium and corrects errors in the demodulated bit-compressed digital information. 15. The digital information receiving / recording / reproducing method according to claim 14, wherein the transmitted bit-compressed digital information is modulated by using a phase modulation method. demodulating said bit compressed digital information to be recorded, the digital information reception recording and reproducing method characterized by the phase <br/> modulation scheme is modulated by using a modulation scheme that differs. 16. The digital information recording / reproducing apparatus according to claim 1, wherein said video information is bit-compressed using a discrete cosine transform. Digital information recording / reproducing device. 17. The digital information receiving / recording / reproducing apparatus according to claim 4, wherein said video information is bit-compressed using a discrete cosine transform. Receiving recording and reproducing device. 18. The digital information recording / reproducing method according to claim 5, wherein said video information is bit-compressed using a discrete cosine transform. Playback method. 19. The digital information receiving / recording / reproducing method according to claim 6, wherein said video information is bit-compressed using discrete cosine transform. Reception recording / playback method.