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US5367336A
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Truncation error correction for predictive coding/encoding
Assignee: Nokia Bell Labs
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Filing: 1992-07-08
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Granted: 1994-11-22
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Expires: 2012-07-08
Abstract
Abstract Apparatus for eliminating the truncation errors associated with a multiplicative leak factor employed in a predictive coding arrangement adds a temporally varying control signal that affects the leak factor multiplication output. Specifically, in one embodiment the leak factor multiplication output is modified by arbitrarily changing, or dithering, the level of the mean signal. In another embodiment, the leak factor multiplication output is modified by effectively dithering the leak factor itself. The latter is accomplished by adding the varying control signal prior to the truncated division which occurs in the leak factor multiplication process.
Inventors
- 👤 George J. Kustka
- 👤 John N. Mailhot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:38
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N19/00; H04N19/90; H04N19/50; H04N19/503; H04N19/60; H04N19/61
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
63 words
Apparatus having a first means responsive to an input signal and an attenuated prediction signal for creating a desired output signal and a second means responsive to a prediction signal and to a leak control signal for creating the attenuated prediction signal, the improvement comprising: third means for temporally altering the attenuated prediction signal with the aid of a truncation-correction (TC) control signal.
Claim 2
Dependent Claim
63 words
Apparatus having a first means responsive to an input signal and an attenuated prediction signal for creating a desired output signal and a second means responsive to a prediction signal and to a leak control signal for creating the attenuated prediction signal, the improvement comprising: third means for temporally altering the attenuated prediction signal with the aid of a truncation-correction (TC) control signal.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1 wherein the TC control signal is independent of any signal related to the input signal.
Claim 4
Dependent Claim
12 words
The apparatus of claim 1 wherein the TC control signal is periodic.
Claim 5
Dependent Claim
32 words
The apparatus of claim 1 wherein the second means comprises an attenuation circuit that is responsive to the third means, and the third means comprises circuitry for developing the TC control signal.
Claim 6
Dependent Claim
61 words
The apparatus of claim 1 wherein: said second means comprises a multiply circuit responsive to a prediction signal, and a truncated division circuit responsive to the multiply circuit; and the third means comprises an adder circuit interposed between the multiply circuit and the truncated division circuit for adding the TC control signal to the signal applied to the truncated division circuit.
Claim 7
Dependent Claim
24 words
The apparatus of claim 5 further comprising a subtractor responsive to the prediction signal and to the output signal of the truncated division circuit.
Claim 8
Dependent Claim
48 words
The apparatus of claim 1 wherein the TC control signal is a periodic clocked signal with a period of N clock pulses and a different level, in the range 0 to N-1, in each of the N clock pulses, where N is related to the leak control signal.
Claim 9
Dependent Claim
14 words
The apparatus of claim 7 wherein the TC control signal is a ramp signal.
Claim 10
Dependent Claim
17 words
The apparatus of claim 7 wherein the TC control signal is a ramp signal with bits reversed.
Claim 11
Dependent Claim
47 words
The apparatus of claim 1 wherein the second means comprises an attenuation circuit in series with an offset subtraction circuit, and the offset subtraction circuit cooperates with the third means to temporally alter the attenuated prediction signal, and wherein the third means develops the TC control signal.
Claim 12
Dependent Claim
20 words
The apparatus of claim 10 wherein the third means develops a sync signal in synchronism with the TC control signal.
Claim 13
Dependent Claim
40 words
The apparatus of claim 10 wherein the third means develops the TC control signal under control of an applied sync signal and causes the output signal developed by the offset subtraction circuit to have the TC control signal added thereto.
Claim 14
Dependent Claim
73 words
The apparatus of claim 1 wherein: said second means comprises a truncated division circuit responsive to a prediction signal and a subtractor responsive to the prediction signal and to the output signal of the shift circuit, and the third means comprises an adder circuit interposed between the prediction signal and the truncated division circuit for adding the TC control signal to the prediction signal prior to its application to the truncated division circuit.
Claim 15
Dependent Claim
14 words
The apparatus of claim 13 wherein the truncated division circuit is a shift circuit.
Claim 16
Dependent Claim
18 words
The apparatus of claim 13 wherein the third means further comprises means for developing the TC control signal.
Claim 17
Dependent Claim
24 words
The apparatus of claim 13 wherein the third means further comprises means for developing the TC control signal synchronously with an applied sync signal.
References Cited (Backward Citations)
US5055843A
Cited
US5128756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-11-21 | 1998-05-23 | 1998-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-21 | 2002-05-23 | 2002-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-21 | 2006-05-23 | 2006-11-22 | $7700.00 | Window Closed / Lapsed |