US5642111A
Expired / Lapsed
US
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High efficiency encoding or decoding method and device
Assignee: Sony Corp
•
Filing: 1994-01-19
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Granted: 1997-06-24
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Expires: 2014-01-19
Abstract
Abstract A high efficiency encoding method in which pre-set bit allocation is made for digital information signals of plural channels and in which coded information signals are produced by the allocated bits. It is desirable in this type of the high efficiency encoding method to avoid sound quality deterioration produced by pre-echo during abrupt changes in the information signals as well as to suppress the pre-echo to assure aurally desirable bit allocation. To this end, in the high efficiency encoding method, in which digital information signals of plural channels are normalized by normalizing units and pre-set bit allocation is made by a bit allocation unit to effect pre-set bit allocation. The amounts of bit allocation between channels are controlled on the basis of temporal changes of the information signals of the respective channels. Besides, the amounts of bit allocation between channels are controlled based on temporal changes of the amplitude information of digital information signals of the respective channels. At least a part of the bits that may be used for bit allocation is preferentially allocated for channels having larger temporal changes of the information signals depending on the magnitude of temporal changes of the information signals among the plural channels. As a result, deterioration in the sound quality due to pre-echo during high efficiency encoding may be prevented in a system having plural audio signal channels.
Inventors
- 👤 Kenzo Akagiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:05
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/66; H04B1/665
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
102 words
A method of encoding, digital information signals of plural channels comprising the steps of: allocating to each of the plural channels, from a totality of bits, a respective number of bits as a first bit allocation, each respective first bit allocation based upon an information signal spectrum of a respective channel; and allocating to at least one of the plural channels, from the totality of bits, an additional number of bits as a second bit allocation, each respective second bit allocation based upon temporal changes of an energy value of the digital information signals in at least one of the plural channels.
Claim 2
Independent Claim
102 words
A method of encoding, digital information signals of plural channels comprising the steps of: allocating to each of the plural channels, from a totality of bits, a respective number of bits as a first bit allocation, each respective first bit allocation based upon an information signal spectrum of a respective channel; and allocating to at least one of the plural channels, from the totality of bits, an additional number of bits as a second bit allocation, each respective second bit allocation based upon temporal changes of an energy value of the digital information signals in at least one of the plural channels.
Claim 3
Dependent Claim
28 words
The method of encoding as claimed in claim 1, wherein said energy value is at least one of an amplitude information, a peak value and a mean value.
Claim 4
Dependent Claim
36 words
The method of encoding as claimed in claim 1, wherein the amounts of the second bit allocation among the plural channels are controlled depending on the temporal changes of the scale factor of the respective channels.
Claim 5
Dependent Claim
49 words
The method of encoding as claimed in claim 3, wherein the amounts of the second bit allocation among the channels are controlled depending on the temporal changes of the scale factor of the respective channels and temporal changes of the word lengths caused by bit allocation among the channels.
Claim 6
Dependent Claim
40 words
The method of encoding as claimed in claim 1, wherein the amounts of the second bit allocation among the channels are controlled depending on the temporal changes of the amplitude information of temporally neighboring plural blocks for the respective channels.
Claim 7
Dependent Claim
68 words
The method of encoding as claimed in claim 1, wherein the totality of bits employed for bit allocation is divided into the first bit allocation which depends on a pattern of indices indicating a signal magnitude in small blocks obtained by sub-division with respect to time and frequency and at least one second bit allocation for aural effects, the second bit allocation appended to said first bit allocation.
Claim 8
Dependent Claim
36 words
The method of encoding as claimed in claim 6, wherein a ratio of distribution between said first bit allocations and the at least one second bit allocation is adaptively controlled depending on the digital information signals.
Claim 9
Dependent Claim
40 words
The method of encoding as claimed in claim 7, wherein said ratio of distribution is controlled so that the greater the temporal changes in said digital information signals, the lesser the ratio of distribution for said first bit allocation becomes.
Claim 10
Dependent Claim
47 words
The method of encoding as claimed in claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein an output of a non-block forming frequency analysis is analyzed by block-forming frequency analysis for producing samples in small blocks obtained by subdivision with respect to time and frequency.
Claim 11
Dependent Claim
34 words
The method of encoding as claimed in claim 9, wherein a block size for said block-forming frequency analysis is adaptively changed depending on temporal characteristics of the digital information signals of the respective channels.
Claim 12
Dependent Claim
30 words
The method of encoding as claimed in claim 10, wherein said block size is changed independently for each of at least two output bands of the non-block forming frequency analysis.
Claim 13
Dependent Claim
29 words
The method of encoding as claimed in claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the encoded digital information signals are recorded on a recording medium.
Claim 14
Dependent Claim
30 words
The method of encoding as claimed in claim 12, wherein said recording medium is at least one of a cinefilm, an optical disc, a magnetic tape and a magneto-optical disc.
Claim 15
Dependent Claim
20 words
A recording medium on which recording is made by the high efficiency encoding recording method as claimed in claim 13.
Claim 16
Dependent Claim
30 words
The method of encoding as claimed in claim 12, wherein said recording medium is at least one of a cinefilm, an optical disc, a magnetic tape and a magneto-optical disc.
Claim 17
Dependent Claim
29 words
The method of encoding as claimed in claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the encoded digital information signals are transmitted on a transmission channel.
Claim 18
Dependent Claim
19 words
The method of encoding as claimed in claim 16, wherein said transmission channel is a digital information transmission channel.
Claim 19
Dependent Claim
117 words
A high efficiency decoding method for decoding encoded information signals, comprising the steps of: separately decoding the encoded information signals for each of the plural channels using respective block size information and respective bit allocation information for each of the plural channels to output frequency domain signals, the encoded information signals obtained on the basis of allocated bits, wherein from a totality of bits a pre-set bit allocation is made for digital information signals of plural channels, and wherein an additional bit allocation among the channels is based on temporal changes of an energy value of the information signals of at least one of the respective channels; and orthogonally transforming the frequency domain signals into time-domain signals.
Claim 20
Dependent Claim
117 words
A high efficiency decoding method for decoding encoded information signals, comprising the steps of: separately decoding the encoded information signals for each of the plural channels using respective block size information and respective bit allocation information for each of the plural channels to output frequency domain signals, the encoded information signals obtained on the basis of allocated bits, wherein from a totality of bits a pre-set bit allocation is made for digital information signals of plural channels, and wherein an additional bit allocation among the channels is based on temporal changes of an energy value of the information signals of at least one of the respective channels; and orthogonally transforming the frequency domain signals into time-domain signals.
Claim 21
Dependent Claim
163 words
A high efficiency decoding device for decoding encoded information signals obtained on the basis of allocated bits, where a pre-set bit allocation is made for digital information signals of plural channels, wherein the bit allocation among the channels is based on temporal changes of an energy value of the information signals of the respective channels, comprising: means for separately decoding the encoded information signals for each of the plural channels using respective block size information and respective bit allocation information for each of the plural channels to output frequency domain signals, the encoded information signals obtained on the basis of allocated bits, wherein from a totality of bits a pre-set bit allocation is made for digital information signals of plural channels, and wherein an additional bit allocation among the channels is based on temporal changes of an energy value of the information signals of at least one of the respective channels; and means for orthogonally transforming the frequency domain signals into time-domain signals.
Claim 22
Dependent Claim
163 words
A high efficiency decoding device for decoding encoded information signals obtained on the basis of allocated bits, where a pre-set bit allocation is made for digital information signals of plural channels, wherein the bit allocation among the channels is based on temporal changes of an energy value of the information signals of the respective channels, comprising: means for separately decoding the encoded information signals for each of the plural channels using respective block size information and respective bit allocation information for each of the plural channels to output frequency domain signals, the encoded information signals obtained on the basis of allocated bits, wherein from a totality of bits a pre-set bit allocation is made for digital information signals of plural channels, and wherein an additional bit allocation among the channels is based on temporal changes of an energy value of the information signals of at least one of the respective channels; and means for orthogonally transforming the frequency domain signals into time-domain signals.
Claim 23
Dependent Claim
125 words
A high efficiency decoding device for decoding encoded information signals, comprising: a plurality of decoders for separately decoding the encoded information signals for each of the plural channels using respective block size information and respective bit allocation information for each of the plural channels to output frequency domain signals, the encoded information signals obtained on the basis of allocated bits, wherein from a totality of bits a pre-set bit allocation is made for digital information signals of plural channels, and wherein an additional bit allocation among the channels is based on temporal changes of an energy value of the information signals of at least one of the respective channels; and a plurality of orthogonal transformers for orthogonally transforming the frequency domain signals into time-domain signals.
Claim 24
Dependent Claim
125 words
A high efficiency decoding device for decoding encoded information signals, comprising: a plurality of decoders for separately decoding the encoded information signals for each of the plural channels using respective block size information and respective bit allocation information for each of the plural channels to output frequency domain signals, the encoded information signals obtained on the basis of allocated bits, wherein from a totality of bits a pre-set bit allocation is made for digital information signals of plural channels, and wherein an additional bit allocation among the channels is based on temporal changes of an energy value of the information signals of at least one of the respective channels; and a plurality of orthogonal transformers for orthogonally transforming the frequency domain signals into time-domain signals.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-23 | 2000-12-23 | 2001-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-23 | 2004-12-23 | 2005-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-23 | 2008-12-23 | 2009-06-24 | $7700.00 | Window Closed / Lapsed |