US3984626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Picture signal coder
Assignee: AT&T Inc
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Filing: 1975-08-01
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Granted: 1976-10-05
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Expires: 1995-08-01
Abstract
Abstract In PCM and DPCM systems, a Hadamard orthogonal transformation of picture element signals is known to offer a means for reducing the bit rate for transmission of the signals. The first Hadamard coefficient, called H 1 , equals the sum of the picture element signals. Accordingly, still further reduction in the transmission bit rate can be achieved by efficiently coding H 1 . The disclosed coder includes a control signal generator for providing a control signal corresponding to a predetermined function of the quantized Hadamard coefficient signals. Several illustrative arrangements are disclosed. In three arrangements, the respective control signals are employed to adaptively select one of a plurality of quantizers, the selected quantizer for coding H 1 . In a fourth arrangement, the control signal is employed to predict H 1 , the predictor control signal being thereafter used for coding H 1 .
Inventors
- 👤 Frank William Mounts
- 👤 Arun Narayan Netravali
- 👤 Birendra Prasada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:47
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/60; H04N19/61; H04N19/619; H04N19/10; H04N19/102; H04N19/13; H04N19/63; H04N19/90; H04N19/91
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
91 words
In a communication system, a circuit for coding a plurality of orthogonally transformed image signals, said transformed signals corresponding to an image to be coded, said circuit including a first plurality of quantizers and characterized in that said circuit further comprises: means for providing a control signal to one of said first plurality of quantizers responsive to a predetermined function of said orthogonally transformed signals; and means in said one quantizer responsive to said control signal for adaptively quantizing a signal corresponding to a predetermined one of said orthogonally transformed signals.
Claim 2
Dependent Claim
91 words
In a communication system, a circuit for coding a plurality of orthogonally transformed image signals, said transformed signals corresponding to an image to be coded, said circuit including a first plurality of quantizers and characterized in that said circuit further comprises: means for providing a control signal to one of said first plurality of quantizers responsive to a predetermined function of said orthogonally transformed signals; and means in said one quantizer responsive to said control signal for adaptively quantizing a signal corresponding to a predetermined one of said orthogonally transformed signals.
Claim 3
Dependent Claim
34 words
The circuit according to claim 1 wherein said signal quantizing means comprises: a second plurality of quantizers; and means responsive to said control signal for adaptively selecting one of said second plurality of quantizers.
Claim 4
Dependent Claim
46 words
The circuit according to claim 1 wherein said signal quantizing means comprises: means for producing a comparison signal, said comparison signal being applied to a second plurality of quantizers; and means responsive to said control signal for adaptively selecting one of said second plurality of quantizers.
Claim 5
Dependent Claim
37 words
The circuit according to claim 1 wherein said signal quantizing means comprises: means responsive to said control signal for producing a comparison signal, said comparison signal being applied to at least one of said plurality of quantizers.
Claim 6
Dependent Claim
22 words
The circuit according to claim 1 wherein said control signal providing means comprises means for obtaining a predetermined attribute of said image.
Claim 7
Dependent Claim
17 words
The circuit according to claim 5 wherein said attribute obtaining means includes means for measuring picture busyness.
Claim 8
Dependent Claim
29 words
The circuit according to claim 5 wherein said attribute obtaining means comprises: means for providing a first signal responsive to all but said predetermined one of said transformed signals.
Claim 9
Dependent Claim
33 words
The circuit according to claim 7 wherein said control signal providing means further comprises: means responsive to said first provided signal for jointly comparing said first signal with a plurality of threshold signals.
Claim 10
Dependent Claim
25 words
The circuit according to claim 8 wherein said control signal providing means further comprises means responsive to said comparing means for providing said control signal.
Claim 11
Dependent Claim
35 words
The circuit according to claim 9 wherein said signal quantizing means further comprises: a second plurality of quantizers; and means responsive to said control signal for adaptively selecting one of said second plurality of quantizers.
Claim 12
Dependent Claim
48 words
The circuit according to claim 9 wherein said signal quantizing means further comprises: means for producing a comparison signal, said comparison signal being jointly applied to a second plurality of quantizers; and means responsive to said control signal for adaptively selecting one of said second plurality of quantizers.
Claim 13
Dependent Claim
23 words
The circuit according to claim 1 wherein said control signal providing means comprises means for decreasing the entropy of said predetermined transformed signal.
Claim 14
Dependent Claim
23 words
The circuit according to claim 12 wherein said control signal providing means further comprises means for obtaining a predetermined attribute of said image.
Claim 15
Dependent Claim
17 words
The circuit according to claim 13 wherein said attribute obtaining means includes means for measuring picture busyness.
Claim 16
Dependent Claim
29 words
The circuit according to claim 13 wherein said attribute obtaining means comprises: means for providing a first signal responsive to all but said predetermined one of said transformed signals.
Claim 17
Dependent Claim
47 words
The circuit according to claim 15 wherein said signal quantizing means further comprises: means for producing a comparison signal, said comparison signal being applied to a second plurality of quantizers; and means responsive to said control signal for adaptively selecting one of said second plurality of quantizers.
Claim 18
Dependent Claim
29 words
The circuit according to claim 16 wherein said entropy decreasing means further comprises means responsive to said first provided signal for comparing said first signal with said comparison signal.
Claim 19
Dependent Claim
24 words
The circuit according to claim 17 wherein said entropy decreasing means further comprises means responsive to said comparing means for providing said control signal.
Claim 20
Dependent Claim
37 words
The circuit according to claim 1 wherein said control signal providing means comprises means for predicting said predetermined transformed signal, said predicting control signal being a predetermined function of all but said predetermined signal currently being coded.
Claim 21
Dependent Claim
35 words
The circuit according to claim 19 wherein said signal quantizing means comprises means for quantizing a comparison signal, said comparison signal corresponding to the difference between said predetermined transformed signal and said predicting control signal.
References Cited (Backward Citations)
US2724740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |