JP3529542B2 - Signal transmission / recording / receiving / reproducing method and apparatus, and recording medium - Google Patents

Signal transmission / recording / receiving / reproducing method and apparatus, and recording medium

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Publication number
JP3529542B2
JP3529542B2 JP08542096A JP8542096A JP3529542B2 JP 3529542 B2 JP3529542 B2 JP 3529542B2 JP 08542096 A JP08542096 A JP 08542096A JP 8542096 A JP8542096 A JP 8542096A JP 3529542 B2 JP3529542 B2 JP 3529542B2
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Japan
Prior art keywords
signal
high
frequency
band
sequence
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP08542096A
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Japanese (ja)
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JPH09282793A (en
Inventor
伸一 中村
Original Assignee
株式会社東芝
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Priority to JP08542096A priority Critical patent/JP3529542B2/en
Priority claimed from US08/801,588 external-priority patent/US6226325B1/en
Publication of JPH09282793A publication Critical patent/JPH09282793A/en
Application granted granted Critical
Publication of JP3529542B2 publication Critical patent/JP3529542B2/en
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Description

DETAILED DESCRIPTION OF THE INVENTION [0001] [0001] The present invention relates to signal transmission / recording.
Recording / receiving / reproducing method and apparatus and recording medium
In particular, wideband digital audio signals
In a device that processes digital audio signals in the band
Organize into compatible formats for compatibility
It was done with a focus on things. [0002] 2. Description of the Related Art Since the advent of compact discs (CDs)
Digital audio signals are widely accepted, CD = C
The image of ifai has been established, but since launch
0 years later, the sound quality of the CD is not enough as Hi-Fi
The recognition that there is is spreading. [0003] Recently, a disk having a higher recording density than a CD has been developed.
Disks have been developed for digital video and digital audio
Digital video discs for recording audio
Classification is taking place. On digital video discs
Record both video and audio signals and
To produce a signal, both signals are compressed, albeit at high density.
The compression is performed and recorded. On the other hand, the recording capacity has increased dramatically.
Recorded with sound quality improved from CD in terms of sound quality
Recording and playback are also considered. Specifically, in addition to compressed audio, uncompressed
It is also possible to handle digital audio, and this
Uncompressed digital audio is sampled like a CD 4
8 kHz, 16 bits from one sample
Pulling frequency 96 kHz, maximum bit width of one sample
It can handle up to 24 bits. This is compared to CD
Then, the reproduction band is more than double from 20kHz to 48kHz,
Dynamic range jumps from 98dB to 136dB
Can be improved. [0005] SUMMARY OF THE INVENTION However, digital
Audio handled by a video disc is converted to a video signal.
This high-density
Audio is handled independently using discs, and even more extreme
Ultra-high-fidelity audio dedicated disc with enhanced sound quality
There is an increasing demand for a new tool. Concrete sound quality improvement
The requirements are the bands that various instruments have and the bands that recording equipment can handle.
Considering that, the audio band is expanded to about 100 kHz
It is hope. By the way, when making a music-only disc,
With previously standardized digital video discs
Compatibility is a problem. Newly standardized music-only directory
Digital video display preceded by a disc player
Forward compatibility (forward core)
Compatibility), as well as new music
Digital video disc play ahead of disc
In terms of function and sound quality, within the performance range of the preceding standard.
Backward compatibility that can be created (backward compatibility)
It is preferable to have [0007] Specifically, 100 kHz is used for a new disc.
Band digital audio signal was recorded.
Is 48k for digital video disc players
The component up to the Hz band can be reproduced
is there. Forward compatibility is common to disk formats.
It is more preferable if the player
It is possible to design the unit to be reproducible. one
On the other hand, backward compatibility means that players of the earlier standard
Because it does not recognize the format,
The format must be made carefully. Further, a signal having a wide band and a large bit width is transmitted.
Recording increases the required bit capacity,
Even a high density disc cannot record for a long time,
Also, the bit rate to be handled increases, which is not preferable. concrete
In other words, the sampling frequency is 192 kHz,
The bit rate of the sample bit width is the same as that of a CD.
Pulling frequency 48 kHz, 16 bit bit rate
Is required six times. So to save a bit
Requires some compression. However, super high
From the standpoint of phi, compression with sound quality degradation
No compression and no compression
Lossless coding (lossless code) that can reproduce data before compression
Is required. An object of the present invention is to provide a narrower band.
Maintain compatibility with digital signal formats
Transmission / recording of fully reproducible, wideband digital signals
/ Providing reception / reproduction method and apparatus and recording medium
is there. [0010] SUMMARY OF THE INVENTION Transmission and recording of the present invention
The method and apparatus converts the input digital signal into a low-frequency signal and a high-frequency signal.
And the low-frequency signal is used as a first signal sequence,
A high-frequency signal is defined as a second signal sequence, and the low-frequency signal and the high-frequency signal
Signal to obtain a synthesized signal, and the synthesized signal
Signal and a difference signal between the input digital signal and a third signal train.
And transmits or records the first, second, and third signal sequences.
It is characterized by having made it.The third signal sequence is:
On the receiving or reproducing side, the low-frequency signal and the high-frequency signal
When the combined signal is combined into a combined signal,
Loss of this composite signal when comparing digital signals
Transmitted or recorded to reduce components
This is the signal sequence as described above. Further, the recording medium of the present invention is a recording medium for input digital data.
Dividing the signal into a low-frequency signal and a high-frequency signal,
Is a first signal sequence, and the high-frequency signal is a second signal sequence.
And band combining using the low band signal and the high band signal.
To obtain a combined signal, and the combined signal and the input digital signal
And a difference signal between the first, second, and third signals,
Are recorded.The third
In the signal sequence, the low-frequency signal and the high-frequency signal are banded on the reproduction side.
When the synthesized signal is obtained by the area synthesis,
When comparing the input digital signals,
Recorded to reduce the components lost fromI
You. Also, a receiving and reproducing method and apparatus according to the present invention.
Splits the digital signal into low-band and high-band signals.
The low-frequency signal is a first signal sequence, and the high-frequency signal
Is a second signal sequence, and the low-frequency signal and the high-frequency signal are
The difference signal between the synthesized signal and the digital signal is a third signal.
The first, second, and third signals are signal sequences.
A method and apparatus for processing a sequence, the method comprising the steps of:
The signal sequence is band-synthesized into a fourth signal sequence, and the third signal
Output signal is obtained by adding to the column
You.The third signal sequence is the low-frequency signal on the receiving or reproducing side.
Signal and the high-frequency signal were subjected to band synthesis to obtain a synthesized signal.
When comparing this composite signal with the digital signal
To reduce the components lost from this composite signal
Is a signal sequence to be transmitted or recorded. [0013] Embodiments of the present invention will be described below with reference to the drawings.
It will be described in the light of the above. FIG. 1 (a) (Transmission or recording side coding
Device) and FIG. 1B (decoding device on the receiving or reproducing side)
Shows a basic block diagram of the present invention. Broadband digital
Audio input signal is supplied to the sub-band analysis filter 11
Is entered. Here, the sampling frequency is 192 k
Hz. Also here we take audio data as an example
But the data types are not limited to this
Signals are possible. The sub-band analysis filter 11 receives the input signal
Is divided into two bands, low and high.
Each output sample is decimated and the sampling frequency 9
6 kHz low-frequency signal and high-frequency signal. Furthermore, high frequency signal
Is data by a lossless encoder (lossless encoder) 12.
The high-frequency signal stream is compressed and the low-frequency signal is
It becomes a low-frequency signal stream as it is. Further, the high frequency signal and the low frequency signal are
Are synthesized by the synthesizing filter 14, and the synthesized
The difference between the signal and the input signal is obtained by a subtractor 15 to obtain a difference signal.
(Combined error signal). The above error signal, low band signal stream and high
The compressed signal stream is transmitted or transmitted by the formatter 13.
Or converted to match the recording format. Playback side
Then, receive or reproduce the transmitted or recorded signal, and
The low-frequency signal stream and the high-frequency signal
The signal stream and the error signal are extracted. High frequency signal
The stream is restored by the lossless decoder 22 to the original uncompressed high-frequency signal.
The uncompressed high frequency signal and low frequency signal are
It is input to the sub-band synthesis filter 23 and becomes a synthesized signal.
This combined signal is added to the error signal by the adder 25.
Is done. As a result, the original wide band is output from the adder 26.
Output signal having a sampling frequency of 192 kHz
Can be The band is determined by the sub-band analysis filter 11.
And divides these divided signals into subband synthesis filters.
The signal reproduced through the monitor 23 is completely
Must match. For such an exact match
Conditions and conditions of complete resynthesis are sub-band analysis filter 1
1 and the characteristics of the subband synthesis filter 23
However, as such a filter, a
Luther (QMF: Quadrature Mirror Filter) is known
ing. However, in reality, the calculation accuracy of the filter
Is the bit width per sample of the band split signal
In general, there is an error to be limited, so complete resynthesis
And a certain error is included. Therefore, in this system, the input signal
To obtain the difference signal between the
Is received or sent to the playback side as an error signal on the playback side
This allows the original signal to be completely recombined
I am trying to. FIG. 2 shows the characteristics of the sub-band filter.
In order to show the spectrum. FIG. 2A shows the spectrum of the input signal.
Shows the coutle. Here, input signal sampling
The frequency is 192 kHz. Also this spectrum
Is the general property of audio signals, the higher the
It also shows that energy is getting smaller. sub
FIG. 2 (b) shows the band-divided low-frequency signal, and FIG.
2 (c). Here, both low-frequency and high-frequency signals are sampled.
The ring frequency is reduced to 96 kHz, which is half of 192 kHz.
The sampling frequency is 96k according to the Nyquist principle.
The component above 48 kHz which is half of Hz is 0 to 48 kHz
It is a signal that has been copied back in between. In particular, the high frequency signal is 9 kHz from the original 48 kHz.
The signal component up to 6 kHz (FIG. 2 (a))
It is folded back to the band up to 8 kHz.
Even if you play back the signal as a PCM signal and listen to it,
It cannot be heard as an audio signal. On the other hand, low frequency signal
Is a PCM signal limited to half the bandwidth of the original input signal
You can play and listen as it is. From now on, the wideband signal format and the narrowband
To be compatible with signal formats
It becomes possible. More specifically, digital video
Compatibility between discs and new audio-only discs
It is possible to have the property. That is, digital video
Audio on the disc is AC-3 or MPEG.
Uncompressed other than highly efficient compression using any psychoacoustic model
The sampling frequency is 48kHz
And 96 kHz, and the bit width is 16, 20,
There are 24 bits. Therefore, the above sampling frequency
Subband analysis filter for 192kHz wideband signal
The low-frequency signal divided by 11 is converted to a digital video
If you record on a disc in the format of
Video disc player has a sample frequency of 96 kHz
It can be played without any problem as audio of z
Wear. On the other hand, high frequency signals are digital video
Because it cannot process anything on a disc,
Video discs ignore this high frequency signal.
Must be formatted. Digital video
To be ignored on a disc,
Flag and I on the format of the
Newly set with D (Definition Data)
There are many ways to do it. A simple example is AC
-3, MPEG, and uncompressed PCM signal streams
New value for ID to specify type for high frequency signal stream
Should be assigned as On the other hand, a new audio-only disc
The ID of the uncompressed PCM signal stream and the new
Recognize both the ID assigned to the low frequency signal and the low frequency signal.
Signal stream and high frequency signal stream
The signal is compressed and decoded by the subband synthesis filter 23.
By reproducing the original wideband signal, digital video
Enjoy super high fidelity audio with higher sound quality than disc
Can be taken. In addition, decoding using the error signal
Thus, the original signal without any error can be reproduced. The present invention will be further described. By the way, band
The sampling frequency of the separated high band signal and low band signal is
One-half of the input signal has been decimated, and the number of samples of both
Is equal to the number of input samples. However, the error signal
Is the sampling frequency of the input signal
Is the same as Therefore, low frequency signal, high frequency signal and error
The total number of samples including the signal is 2 of the number of input signal samples.
Double. Therefore, data compression becomes important. First, the high band signal generally has the signal energy
Signal, and various pressures can be
Shrinking is possible. Here, the compression of the error signal will be described.
I do. The input signal is P (z). Sub-band
Through the processing of the analysis filter 11, two band signals L,
U is obtained. L (z) = F1 (z) .P (z), U (z) = F2 (z) .P (z) Synthesized signal S (z) by subband synthesis filter 23
Is obtained. [0027]   S (z) = G1 (z) · L (z) + G2 (z) · U (z) = {G1 (z) .F1 (z) + G2 (z) .F2 (z)} P (z) Here, sampling and interpolation are performed on the way.
However, if an orthogonal mirror filter is used, S (z) = P
(Z). However, an error actually occurs.
There are two sources of error. One is the filter calculation error.
Yes, this is the internal word length of the arithmetic unit,
Related to The other is that the band-divided signal is calculated
Long word length appearing as a result is transmitted or recorded as it is
It is too wasteful to do so
You. Generally, the input word length is the same, for example, if the input signal is
If it is 24 bits, two band-divided signals are also 24 bits.
Bit cut off. The former related to hardware is the latter
It is possible to make it much smaller, and generally the error
Is dominant. Therefore, the error amplitude is at most ± LSB
About. Let these errors be E1 (z) and E2 (z)
When,   L '(z) = F1 (z) .P (z) + E1 (z)   U '(z) = F2 (z) .P (z) + E2 (z)   S '(z)   = {G1 (z) .F1 (z) + G2 (z) .F2 (z)} P (z)           + {G1 (z) .E1 (z) + G2 (z) .E2 (z)}   = P (z) + {G1 (z) .E1 (z) + G2 (z) .E2 (z)} Here, a decoding error E (z) is obtained. E (z) = G1 (z) .E1 (z) +
G2 (z) and E2 (z) When the magnitude of this E (z) is estimated,
It depends on the filter characteristics, G1 (z) and G2 (z), | E (z) | <nΔ; n = integer, Δ = minimum quantization value
Tep (LSB) When n is set, n can be held down to a small value of about 1 to 3.
Is possible. Therefore, the error signal can be represented by several bits at most.
Data volume can be greatly reduced. Thus the error signal is
Although it can be expressed with a small number of bits,
You can also. FIG. 3 shows a block diagram thereof. here
Indicates that the error signal is further input to the lossless encoder 16 and
Loss compression. Loss the separated error signal on the decoding side
Lossless compression decoding by the
The adder 25 adds the resultant signal. Error signals are generally run
It is a dumb signal and lossless compression is based on the method used for high frequency signals.
Different methods must be considered. Here, the lossless compression applied to the error signal
An example of more specific group coding will be described. example
If the error signal can be represented by only three values of +1, 0, and -1,
You. Such a case is generally represented using two bits.
For example, “01” +1 “00” 0 “11” -1 “10” * It becomes. Here, "10" means nothing, and as information
This is a waste of money. So, multiple samples
Encoding in batches can be encoded with fewer bits
You. Three samples are now P (1), P (2), P
(3), and each has a value of +1, 0, -1.
You. A = (P (1) +1) * 9 + (P (2) +
1) * 3 + P (3) At this time, A has a positive value of 0 to 26 and is represented by 5 bits.
Indicates that you can do it. This is 5 /
3 = approximately 1.7 bits.
Approximately 15% reduction compared to the case where pull 2 bits are given
Will be. A is P (1), P (2), P
(3) easily, P (1) = A / 9-1 A = A- (P (1) +1) * 9 P (2) = A / 3-1 A = A- (P (2) +1) * 3 P (3) = A Can be decoded as FIG. 4 shows each sample +2, +1, 0,-
Actual sample for the case of having five values of 1, -2
4 shows how data is group-encoded. FIG. 4 (a)
Are collected, and group codes are collected as shown in FIG.
And A = (P (1) +2) * 25 + (P (2) +2) * 5 +
P (3) +2 Then the value of A is 0-124, expressed in 7 bits
Wear. This gives each sample 7/3 = 2.3 bits,
22% less than giving 3 bits to each sample
it can. As described above, the group coding is more efficient.
Data compression, lossless compression and complete
Can be decrypted. In another embodiment,
The error signal to form a block that collects multiple samples.
Block-by-block table according to the maximum absolute value of the error signal in the lock
By setting the current number of bits, more efficient
And then group-encode them to get more data
Compression is possible. As described above, according to the present invention, the broadband
Signal transmission / recording with a narrower band than the signal transmission / recording system of
And compatibility with recording systems
Data capacity without compromising signal quality.
Compression can be performed. In addition, no loss of information
The issue can also be reproduced. According to the present invention, the same transmission medium can be used.
A. While using recording media,
The user can make a reproduction decoder according to the
it can. In the above data compression encoding, the error signal
As described above, the compression code
May be compressed or compressed by a method such as bit reduction.
Needless to say, it may be made into a case. Next, an optical disk system to which the present invention is applied
The stem will be briefly described. FIG.
FIG. 6 shows a raw device, and FIG.
To drive the optical disc 100 on which the
FIG. 7 shows a basic configuration of the disk drive unit 30. FIG.
FIG. 2 is a diagram for explaining a configuration example of a disk 100.
You. The optical disk reproducing apparatus shown in FIG. 5 will be described. light
The disc reproducing apparatus has a key operation / display unit 500.
You. Monitor and speaker are connected to the optical disk playback device
Is done. Pickup read from optical disc 100
System data via the disk drive unit 501.
Sent to the system processing unit 504. Read from optical disc 100
The picked-up data is, for example, video data,
Including sub-picture data and audio data, these data
Are separated by the system processing unit 504. Movie isolated
The image data is video-decoded via the video buffer 506.
The sub-picture data is supplied to the
Supplied to the sub-picture decoder 509 via
The data is transferred to the audio buffer 512 via the audio buffer 512.
The data is supplied to the decoder 513. Video decoder 508
The decoded video signal is decoded by the sub-video decoder 509.
The synthesized sub video signal is synthesized by the synthesizing unit 510.
Output as an analog video signal by the D / A converter 511
Supplied to the monitor. Deco with audio decoder 513
The audio signal thus read is input to a D / A converter 514.
It becomes a analog audio signal and is supplied to the speaker. Reference numeral 502 denotes a system CPU, which is a playback device.
The whole is managed by this system CPU 502.
You. Therefore, the system CPU 502
Live unit 501, system processing unit 504, key operation / table
Exchange of control signals, timing signals, etc. with the display unit 500
It can be carried out. The system CPU 502 includes a system
ROM / RAM 503 is connected to this system.
ROM / RAM 503 includes a system CPU 502.
When a fixed program for data processing is stored
Both are management data reproduced from the optical disc 100, etc.
Can also be stored. The data RAM 505 is provided in the system processing unit 5
04, and the above-mentioned data separation and error correction, etc.
Is used as a buffer when performing The disk shown in FIG.
The drive unit 501 will be described. The disk motor drive circuit 531 has a spin
The dollar motor 532 is driven to rotate. Spindle motor 5
When the optical disk 32 rotates, the optical disk 10 rotates.
Recording data recorded on the optical disk by the unit 533
It is possible to pick up. Optical head 5
The signal read by 33 is sent to a head amplifier 534.
The output of the head amplifier 534 is supplied to the previous system.
Is input to the system processing unit 504. The feed motor 535 is a feed motor
Driven by the drive circuit 536. Feed motor 53
5 moves the optical head 533 in the radial direction of the optical disc 10
Drive. The optical head unit 533 includes a focus mechanism and
Tracking mechanisms are provided, and these mechanisms
Focus circuit 537, tracking circuit 53
8 is provided. Disk motor drive circuit 531, feed
The motor drive circuit 536, the focus circuit 537,
For the king circuit 538, the servo processing unit 539
Control signal is input. This allows the disk mode
532, the frequency of the pickup signal is a predetermined frequency.
The rotation of the optical disc 100 is controlled so that
The optical circuit 537 is a focal point of the optical beam of the optical head unit 533.
The optical system so that
And a tracking circuit 53.
8 is for irradiating the optical beam to the center of the desired recording track.
Control the tracking mechanism so that The structure of the optical disc 100 shown in FIG.
Will be explained. The optical disc 100 is clamped on both sides.
An information recording area 102 is provided around the area 101. information
The recording area 102 is a read area where no information is recorded on the outer periphery.
Out region 103, and the clamp region 101
Lead-in area 104 where no information is recorded at the boundary of
Having. This lead-out area 103 and the lead-in area
The area between the areas 104 is the data recording area 105. In the data recording area 105, a track
It is formed continuously in an italic form. This track has multiple
Is divided into physical sectors, and the sectors are numbered consecutively.
Is attached. Track signal traces can be used as pits
Is formed. Read-only optical discs are transparent
A pit row is formed on the substrate by a stamper, and this pit row is
A reflection film is formed on the formation surface to form a recording layer. 2 sheets
In the case of a laminated optical disk, such a recording layer
The two disks are joined together via an adhesive layer so as to face each other.
It is a composite disc. Next, the logical format of the optical disc 100 is described.
The format will be described. Information of information recording area 105
The logical format that is a report category is a specific standard, for example,
Determined in accordance with Micro UDF and ISO9660
ing. The logical address is micro UDF and ISO9
Means the logical sector number (LSN) defined in 660
However, the size of the logical sector is the same as the size of the physical sector.
The logical sector is 2048 bytes and the logical sector number is
(LSN) is a serial number along with ascending physical sector numbers
Is attached. The logical format has a hierarchical structure.
Volume and file structure area, video manager,
At least one or more video title sets and other
It has a recording area. These areas are bounded by logical sectors.
It is divided above. One logical sector is 2048 bytes.
is there. One logical block is also 2048 bytes. The file structure area includes a micro UDF and
This corresponds to the management area defined by ISO9660.
Through the description of the area, the video manager's data
It is stored in the system ROM / RAM unit 52. Video money
Jar information for managing video title sets
Is described in multiple files starting from file # 0.
It is configured. Video title sets are compressed
Video data, sub-picture data, audio data and
Playback control information for playing them is recorded.
You. In the other recording area, the video title set
Information used when using the information of
The information used for is recorded. FIG. 8 shows a video in a video title set.
4 shows an example of an object set (VOBS). Bi
As a video object set (VOBS), menu
For video title set, but has the same structure as for video title set.
You. Video Object Set (VOBS)
Is a set of one or more video objects (VOBs)
VOBs are used for the same purpose. Through
Video object set for menu (VOB)
S) is a video program for displaying a plurality of menu screens.
Object (VOB), video title
The video object set (VOBS) for the set is
A video object (V
OB). The video object (VOB) has an identification
Number (VOB IDN # j), and this identification
Number (VOB Video object using IDN # j)
(VOB) can be specified. One video
Object (VOB) consists of one or more cells
Have been. Similarly, the identification number (C IDN #
j), and the identification number (C IDN # j)
Can be used to specify a cell. For menu
Video objects can consist of one cell
is there. One cell further includes one or more video
Object unit (VOBU).
And one video object unit (VOBU)
Starts with one navigation pack (NV pack)
Is defined as a pack sequence. One video object
The project unit (VOBU) is the next from the NV pack.
A set of all packs recorded just before the NV pack
Is defined. Video object unit (VOBU)
The playback time of the VOBU is singular or multiple.
Consists of several GOPs (Group of Pictures)
Video data playback time, which is about
It is determined within 0.4 second or more and within 1 second. MPEG
According to the standard, one GOP corresponds to a playback time of about 0.5 seconds.
Image data is compressed. Therefore,
According to the MPEG standard, both audio and video
Information for 0.5 seconds is arranged. One video object unit (VO)
In the BU), the above-mentioned NV pack is first, and
Opak (V pack), Sub-picture pack (SP pack),
Audio packs (A packs) are arranged. Yo
The playback time of a plurality of V packs in one VOBU is 1 second.
Compressed image data within 1 GOP or multiple GOs
P, and corresponds to this playback time
Audio signals are compressed and arranged as A-packs
Have been. Also, the sub-picture data used during this playback time
They are compressed and arranged as SP packs. However,
The audio signal is, for example, 8 streams,
For example, 32 streams of data are packed and recorded.
Have been. One stream of audio signal is one kind of code
Data encoded in an encoding format, such as linear P
CM, composed of 8 channels of 20-bit quantized data
Have been. The previous volume manager information (VMG
I) includes information for searching for a video title.
Is described. That is, the volume management information management table
(VMGI MAT) has a video manager (V
MG) size, the status of each information in the video manager
Address, video for video manager menu
Object Set (VMGM Genus about VOBS)
Sex information etc. are described. Also, title search points
Tar table (TT SRPT) includes key operation of the device
And selection according to the input of the title number from the display section 500.
Video data included in the volume of the optical disc
Ittle's Entry Program Chain (EPGC)
It has been described. An optical disk reproducing apparatus and recording as described above
When the present invention is applied to a medium, the A-pack of the recording medium
The low, high and difference signals are identified by identification numbers
Recorded. Therefore, A with the identification number of the low-frequency signal
A device that can determine and decode the pack,
All A-packs with difference signal identification numbers are identified and
By creating a device that can code, by rank
Hi-fi equipment can be obtained. [0059] As described above, according to the present invention,
A broadband signal transmission and recording system,
Compatibility and compatibility with narrowband signal transmission and recording systems
And as a broadband system,
Data volume without compromising the quality of the issue content.
I can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit block diagram for explaining one embodiment of the present invention. FIG. 2 is a frequency spectrum diagram of a signal for explaining the operation of the present invention. FIG. 3 is a circuit block diagram for explaining the operation of another embodiment of the present invention. FIG. 4 is a diagram for explaining the operation of the embodiment of the present invention. FIG. 5 is a block diagram of a disk reproducing apparatus. FIG. 6 is an explanatory diagram of a disk drive unit. FIG. 7 is an explanatory diagram of an optical disk. FIG. 8 is an explanatory diagram of a video object. [Description of Code] 11: Sub-band analysis filter 12: Lossless encoder 13: Formatter 21: Deformatter 22: Lossless decoder 23: Sub-band synthesis filter.

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Claims (1)

  1. (57) Claims 1. An input digital signal is band-divided into a low band signal and a high band signal, the low band signal is used as a first signal sequence, and the high band signal is used as a second signal sequence. A signal sequence is obtained by performing band synthesis using the low-frequency signal and the high-frequency signal to obtain a composite signal, and a difference signal between the composite signal and the input digital signal is defined as a third signal sequence. A second or third signal sequence is transmitted or recorded, and the third signal sequence is combined with the low-frequency signal on the receiving or reproducing side.
    When the high-frequency signal is band-synthesized into a synthesized signal
    When comparing the composite signal with the input digital signal,
    To reduce the components lost from this composite signal
    , The transmission / recording process of the signal, characterized in that it has to be transmitted or recorded. 2. A means for dividing an input digital signal into a low-frequency signal and a high-frequency signal, wherein said low-frequency signal is a first signal sequence and said high-frequency signal is a second signal sequence. Means for obtaining a synthesized signal by performing band synthesis using the band signal and the high band signal, and setting a difference signal between the synthesized signal and the input digital signal as a third signal sequence; Means for transmitting or recording a third signal sequence , wherein the third signal sequence is combined with the low-frequency signal on the receiving or reproducing side.
    When the high-frequency signal is band-synthesized into a synthesized signal
    When comparing the composite signal with the input digital signal,
    To reduce the components lost from this composite signal
    A signal transmission / recording device characterized by being transmitted or recorded . 3. An input digital signal is band-divided into a low-frequency signal and a high-frequency signal, the low-frequency signal is used as a first signal sequence, the high-frequency signal is used as a second signal sequence, and the low-frequency signal and A synthesized signal is obtained by performing band synthesis using the high-frequency signal, and a difference signal between the synthesized signal and the input digital signal is set as a third signal sequence, and the first, second, and third signal sequences are used as the third signal sequence. A corresponding signal is recorded, and the third signal sequence includes the low-frequency signal and the high-frequency signal on the reproduction side.
    When the signal and the signal are band-combined into a combined signal,
    When comparing the synthesized signal with the input digital signal,
    Record to reduce components missing from the composite signal
    Recording medium characterized in that it is. 4. The digital signal is band-divided into a low-frequency signal and a high-frequency signal, wherein the low-frequency signal is a first signal sequence, the high-frequency signal is a second signal sequence, and the low-frequency signal is A difference signal between the digital signal and the synthesized signal obtained by band-synthesizing the high-frequency signal and the high-frequency signal is defined as a third signal sequence.
    Wherein the third signal sequence is combined with the low-frequency signal on the receiving or reproducing side.
    When the high-frequency signal is band-synthesized into a synthesized signal
    When comparing this composite signal with the digital signal,
    To reduce the components lost from this composite signal
    To a signal sequence to be used, the first and to the second signal string band synthesizing a fourth signal sequence, the output signal by adding this fourth issue column and the third signal sequence Receiving / playback method to get 5. The digital signal is band-divided into a low-frequency signal and a high-frequency signal, wherein the low-frequency signal is a first signal sequence, the high-frequency signal is a second signal sequence, and the low-frequency signal is A difference signal between the digital signal and a synthesized signal obtained by band-synthesizing the high-frequency signal and the high-frequency signal is a third signal sequence.
    When the high-frequency signal is band-synthesized into a synthesized signal
    When comparing this composite signal with the digital signal,
    To reduce the components lost from this composite signal,
    A signal sequence to be transmitted or recorded, to which the first, second, and third signal sequences are introduced, wherein the first and second signal sequences are band-synthesized and A receiving / reproducing apparatus that obtains an output signal by obtaining a signal sequence of No. 4 and adding the fourth signal sequence and the third signal sequence. 6. The apparatus according to claim 2, further comprising means for losslessly encoding said high-frequency signal to form said second signal sequence.
    Transmission / recording device as described. 7. The method according to claim 7, wherein said difference signal is losslessly encoded and said third signal is encoded.
    3. The transmission / recording apparatus according to claim 2, further comprising means for converting the signal sequence into: 8. The receiving / reproducing apparatus according to claim 5, further comprising means for losslessly decoding said second signal sequence to generate said high-frequency signal. 9. The receiving / reproducing apparatus according to claim 5, further comprising means for losslessly decoding said third signal sequence to produce said difference signal.
JP08542096A 1996-04-08 1996-04-08 Signal transmission / recording / receiving / reproducing method and apparatus, and recording medium Expired - Fee Related JP3529542B2 (en)

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JP08542096A JP3529542B2 (en) 1996-04-08 1996-04-08 Signal transmission / recording / receiving / reproducing method and apparatus, and recording medium
US08/801,588 US6226325B1 (en) 1996-03-27 1997-02-18 Digital data processing system
EP19970102589 EP0798866A2 (en) 1996-03-27 1997-02-18 Digital data processing system
KR1019970005226A KR970071713A (en) 1996-03-27 1997-02-21 Digital data processing system

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SE0202159D0 (en) 2001-07-10 2002-07-09 Coding Technologies Sweden Ab Efficientand scalable parametric stereo coding for low bit rate applications
US8605911B2 (en) 2001-07-10 2013-12-10 Dolby International Ab Efficient and scalable parametric stereo coding for low bitrate audio coding applications
ES2237706T3 (en) 2001-11-29 2005-08-01 Coding Technologies Ab Reconstruction of high frequency components.
SE0202770D0 (en) 2002-09-18 2002-09-18 Coding Technologies Sweden Ab Method for reduction of aliasing introduces by spectral envelope adjustment in real-valued filter bank

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