Patent US4785322A successfully refreshed from Google Patents.
Patent US5872531A successfully refreshed from Google Patents.
US5872531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal encode/decode system
Assignee: Microsoft Technology Licensing LLC
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Filing: 1997-02-11
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Granted: 1999-02-16
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Expires: 2017-02-11
Abstract
Abstract An electronic method and apparatus for signal encoding and decoding to provide ultra low distortion reproduction of analog signals, while remaining compatible with industry standardized signal playback apparatus not incorporating the decoding features of the invention, and wherein the improved system provides an interplay of gain, slew rate and wave synthesis operations to reduce signal distortions and improve apparent resolution, all under the control of concealed control codes for triggering appropriate decoding signal reconstruction compensation complementing the signal analysis made during encoding. In addition, signals lacking the encoding process features of the invention are likewise compatible with playback decoders which do embody the invention, to provide some overall restoration enhancement.
Inventors
- 👤 Keith O. Johnson
- 👤 Michael W. Pflaumer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:39
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10527; G06; G06J; G06J1/00; H; H03; H03M; H03M5/00; H03M5/02; H03M5/04; H04; H04B; H04B14/00; H04B14/02; H04B14/04; H04B14/046
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
146 words
A method for converting and encoding an analog signal to a digital format and subsequently decoding and converting said digital format to recover the analog signal, comprising the steps of: monitoring the physical characteristics of an analog waveform to be converted to a digital format; converting said analog waveform to said digital format; encoding within said digital format control information indicative of the physical characteristics of said analog waveform, whereby said analog waveform can subsequently be more accurately reconstructed from said digital format; decoding from said digital format said control information indicative of certain specified physical characteristics of said analog waveform; converting said digital format signal to said analog waveform; and peak limiting and restoring; and introducing compatible signal reconstruction compensation, in accordance with said control information during said converting process, said information facilitating subsequent more accurate reconstruction of said analog waveform from said digital format.
Claim 2
Independent Claim
146 words
A method for converting and encoding an analog signal to a digital format and subsequently decoding and converting said digital format to recover the analog signal, comprising the steps of: monitoring the physical characteristics of an analog waveform to be converted to a digital format; converting said analog waveform to said digital format; encoding within said digital format control information indicative of the physical characteristics of said analog waveform, whereby said analog waveform can subsequently be more accurately reconstructed from said digital format; decoding from said digital format said control information indicative of certain specified physical characteristics of said analog waveform; converting said digital format signal to said analog waveform; and peak limiting and restoring; and introducing compatible signal reconstruction compensation, in accordance with said control information during said converting process, said information facilitating subsequent more accurate reconstruction of said analog waveform from said digital format.
Claim 3
Dependent Claim
26 words
A method as set forth in claim 1, wherein said information indicative of the physical characteristics of said analog waveform is encripted within said digital format.
Claim 4
Dependent Claim
26 words
A method as set forth in claim 1, wherein said information indicative of the physical characteristics of said analog waveform is concealed within said digital format.
Claim 5
Independent Claim
28 words
A method as set forth in any of claims 1, 2 or 3, wherein said control information is encripted to the least significant bits of said digital format.
Claim 6
Dependent Claim
19 words
A method as set forth in claim 4, wherein said control information is in the form of control codes.
Claim 7
Dependent Claim
21 words
A method as set forth in claim 1, wherein said peak limiting and restoring includes an encoder selected algorithm for decoding.
Claim 8
Dependent Claim
22 words
A method as set forth in claim 1, wherein said peak limiting and restoring includes one-to-one mapping for reconstruction by a decoder.
Claim 9
Dependent Claim
21 words
A method as set forth in claim 1, wherein said peak limiting and restoring includes use only at highest peak levels.
Claim 10
Dependent Claim
27 words
A method as set forth in claim 1, wherein said peak limiting and restoring includes mimicking analog tape saturation curve shape for low distortion in un-decoded playback.
Claim 11
Independent Claim
87 words
A system for converting and encoding analog signals to a digital format, comprising: means for monitoring the physical characteristics of an analog waveform to be converted to a digital format; means for converting said analog waveform to said digital format; limiting means for peak limiting said digital format; means for selectively activating said limiting means; and means for encoding within said digital format information indicative of the physical characteristics of said analog waveform, to facilitate subsequent more accurate reconstruction of said analog waveform from said digital format.
Claim 12
Independent Claim
87 words
A system for converting and encoding analog signals to a digital format, comprising: means for monitoring the physical characteristics of an analog waveform to be converted to a digital format; means for converting said analog waveform to said digital format; limiting means for peak limiting said digital format; means for selectively activating said limiting means; and means for encoding within said digital format information indicative of the physical characteristics of said analog waveform, to facilitate subsequent more accurate reconstruction of said analog waveform from said digital format.
Claim 13
Dependent Claim
27 words
A system as set forth in claim 10, and further including limiting means for peak limiting said digital format; and means for selectively actively said limiting means.
Claim 14
Dependent Claim
26 words
A system as set forth in claim 10, wherein said information indicative of the physical characteristics of said analog waveform is encripted within said digital format.
Claim 15
Dependent Claim
26 words
A system as set forth in claim 10, wherein said information indicative of the physical characteristics of said analog waveform is concealed within said digital format.
Claim 16
Dependent Claim
22 words
A system as set forth in claim 10, wherein said information is encripted to the least significant bits of said digital format.
Claim 17
Dependent Claim
18 words
A system as set forth in claim 10, wherein said information is in the form of control codes.
Claim 18
Dependent Claim
24 words
A system as set forth in claim 10, wherein said digital format represents a compressed signal to be complementary expanded by a subsequent decoder.
Claim 19
Independent Claim
19 words
A system as set forth in any of claims 10 through 16, wherein said information relates to slew correction.
Claim 20
Independent Claim
19 words
A system as set forth in any of claims 10 through 16, wherein said information relates to level correction.
Claim 21
Independent Claim
19 words
A system as set forth in any of claims 10 through 16, wherein said information relates to waveform synthesis.
Claim 22
Independent Claim
23 words
A system as set forth in any of claims 10 through 16, wherein said information relates to level, slew and corrective waveform synthesis.
References Cited (Backward Citations)
US3919657A
Cited
US3999129A
Cited
US4187466A
Cited
US4219880B1
Cited
US4219880A
Cited
US4490691A
Cited
EP0058482A1
Cited
US4472747A
Cited
US4700362A
Cited
US4546342A
Cited
US4710747A
Cited
US5055845A
Cited
US5068899A
Cited
US4788685A
Cited
EP0255111A2
Cited
US4849957A
Cited
US4831464A
Cited
US4903301A
Cited
US4933675A
Cited
US4908722A
Cited
EP0379613A1
Cited
US4914438A
Cited
US4940977A
Cited
US4903020A
Cited
EP0349664A1
Cited
US5146457A
Cited
US5185806A
Cited
US5089820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-15 | 2002-08-17 | 2003-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-15 | 2006-08-17 | 2007-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-15 | 2010-08-17 | 2011-02-16 | $7700.00 | Window Closed / Lapsed |