US4974235A
Expired / Lapsed
US
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Method of adaptive quantization in differential pulse code modulation and a system for transmitting quantized data
Assignee: Sony Corp
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Filing: 1988-12-01
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Granted: 1990-11-27
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Expires: 2008-12-01
Abstract
Abstract A transmission method for digital data which is adapted to transmit a predictive residual at every sample and a predictive coefficient and a normalization gain at every data block to thereby provide highly efficient coding and data transmission. An adaptive quantization method suitable for use in the above-mentioned digital data transmission, forms samples into a block and a predetermined multiplication is effected on the sample of each of the blocks to thereby improve the accuracy of the predictive coefficients. A stable operation may be ensured in the adaptive quantizing method by cancelling the subsequent operation when the auto-correlation of input data is not recognized.
Inventors
- 👤 Takayuki Sasaki
- 👤 Hisayoshi Moriwaki
- 👤 Hideki Fukasawa
- 👤 Hiromi Takano
- 👤 Kenzo Akagiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:15
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/928; H03; H03M; H03M7/00; H03M7/30; H03M7/3053
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
188 words
A system for transmitting data blocks quantized in accordance with adaptive quantization in differential pulse code modulation, the quantized data transformed from source data by a predetermined sampling frequency, comprising: means for producing a predictive coefficient from sampled data contained in every data block, which is composed of a predetermined number of the sampled data; means for producing a normalization gain from said sampled data in every data block; means connected to receive said predictive coefficient for producing a predictive residual in accordance with the predictive coefficient at every sampled datum in the data block corresponding to the predictive coefficient; means connected to receive said predictive residual for normalizing said predictive residual of the data block corresponding to the normalization gain in accordance with the normalization gain to produce a normalized predictive residual; means connected to receive said normalized predictive residual for transmitting said normalized predictive residual to a decoder, one said sampled datum at a time; and means connected to receive said predictive coefficient and said normalized gain for transmitting said predictive coefficient and said normalization gain to the decoder, one said data block at a time.
Claim 2
Independent Claim
188 words
A system for transmitting data blocks quantized in accordance with adaptive quantization in differential pulse code modulation, the quantized data transformed from source data by a predetermined sampling frequency, comprising: means for producing a predictive coefficient from sampled data contained in every data block, which is composed of a predetermined number of the sampled data; means for producing a normalization gain from said sampled data in every data block; means connected to receive said predictive coefficient for producing a predictive residual in accordance with the predictive coefficient at every sampled datum in the data block corresponding to the predictive coefficient; means connected to receive said predictive residual for normalizing said predictive residual of the data block corresponding to the normalization gain in accordance with the normalization gain to produce a normalized predictive residual; means connected to receive said normalized predictive residual for transmitting said normalized predictive residual to a decoder, one said sampled datum at a time; and means connected to receive said predictive coefficient and said normalized gain for transmitting said predictive coefficient and said normalization gain to the decoder, one said data block at a time.
Claim 3
Independent Claim
100 words
A method of adaptive quantization in differential pulse code modulation for quantized data transformed from source data by a predetermined sampling frequency, for coding the source data using a predictive residual for every data block which is composed of a predetermined number of sampled data, said method comprising the steps of: detecting auto-correlation of said quantized data; interrupting the detecting step when it is detected that quantized data does not have the auto-correlation in said detecting step; and setting correlation data, corresponding to data subsequent to the quantized data which does not have said auto-correlation, to a preselected constant value.
Claim 4
Independent Claim
100 words
A method of adaptive quantization in differential pulse code modulation for quantized data transformed from source data by a predetermined sampling frequency, for coding the source data using a predictive residual for every data block which is composed of a predetermined number of sampled data, said method comprising the steps of: detecting auto-correlation of said quantized data; interrupting the detecting step when it is detected that quantized data does not have the auto-correlation in said detecting step; and setting correlation data, corresponding to data subsequent to the quantized data which does not have said auto-correlation, to a preselected constant value.
Claim 5
Independent Claim
109 words
A method of adaptive quantization in differential pulse code modulation for quantized data transformed from source data by a predetermined sampling frequency, for coding the source data using a predictive residual for every data block which is composed of a predetermined number of sampled data, the method comprising the steps of: weighting the quantized data by a predetermined significance; detecting the datum with the largest value in each of said data block; multiplying the largest datum by a predetermined coefficient such that the largest datum is larger than a predetermined value; and producing predictive coefficients by multiplying other samples in each of the data blocks by the predetermined coefficient.
Claim 6
Independent Claim
109 words
A method of adaptive quantization in differential pulse code modulation for quantized data transformed from source data by a predetermined sampling frequency, for coding the source data using a predictive residual for every data block which is composed of a predetermined number of sampled data, the method comprising the steps of: weighting the quantized data by a predetermined significance; detecting the datum with the largest value in each of said data block; multiplying the largest datum by a predetermined coefficient such that the largest datum is larger than a predetermined value; and producing predictive coefficients by multiplying other samples in each of the data blocks by the predetermined coefficient.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-11-26 | 1994-05-28 | 1994-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-26 | 1998-05-28 | 1998-11-27 | $3760.00 | Window Closed / Lapsed |
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