US4121295A
Expired / Lapsed
US
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Integer weighted impulse equivalent coded signal processing apparatus
Assignee: WITTRONICS Inc
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Filing: 1977-04-07
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Granted: 1978-10-17
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Expires: 1997-04-07
Abstract
Abstract A signal processing apparatus for use in data communications systems where the transmitted signal is subject to the effects of short duration interference, such as impulse noise, or for use in data recording systems where recorded data is subject to the effects of imperfections in the recording media, wherein a coded transformation is performed on an input signal to the apparatus in accordance with a selected time distribution and selected multi-level, integer related weighting functions to produce a coded signal. A decoder can be used to reversibly transform such signal so as to substantially reproduce the input signal in a manner such that the effects of such noise and recording imperfections are minimized.
Inventors
- 👤 Richard P. Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:42
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/62; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03828; H04L25/03866
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
132 words
A system for processing an input signal comprising coding means responsive to said input signal for linearly transforming said input signal in accordance with a selected time distribution and selected multi-level, integer related weighting functions to produce a plurality of weighted signals, the weighting functions being selected so as to provide a reasonably uniform power distribution of the larger amplitude ones of said plurality of weighted signals and so as to provide a ratio of the peak amplitude of the autocorrelation function of said plurality of weighted signals to the sum of the non-peak amplitudes thereof which is greater than n/(n-1) where n is the number of terms in said plurality of weighted signals; and means responsive to said coding means for combining said weighted signals to produce a coded output signal.
Claim 2
Independent Claim
132 words
A system for processing an input signal comprising coding means responsive to said input signal for linearly transforming said input signal in accordance with a selected time distribution and selected multi-level, integer related weighting functions to produce a plurality of weighted signals, the weighting functions being selected so as to provide a reasonably uniform power distribution of the larger amplitude ones of said plurality of weighted signals and so as to provide a ratio of the peak amplitude of the autocorrelation function of said plurality of weighted signals to the sum of the non-peak amplitudes thereof which is greater than n/(n-1) where n is the number of terms in said plurality of weighted signals; and means responsive to said coding means for combining said weighted signals to produce a coded output signal.
Claim 3
Dependent Claim
17 words
A system in accordance with claim 1 wherein said selected weighting functions are derived from Barker sequences.
Claim 4
Dependent Claim
38 words
A system in accordance with claim 2 and further including decoding means responsive to said coded output signal for reversibly transforming said coded output signal to produce a signal which is a substantial reproduction of said input signal.
Claim 5
Dependent Claim
15 words
A system in accordance with claim 3 wherein said decoding means is an autocorrelation means.
Claim 6
Dependent Claim
83 words
A signal processing system in accordance with claim 1 and further including means responsive to said coded output signal for transmitting said coded output signal through a transmission medium having impulse noise signals; means for receiving said transmitted coded output signal; and decoding means responsive to said receiving means for reversibly transforming said transmitted coded output signal to produce a signal which is a substantial reproduction of said input signal in which the effects of said impulse noise signals thereon are substantially reduced.
Claim 7
Dependent Claim
19 words
A signal processing system in accordance with claim 5 wherein said selected weighting functions are derived from Barker sequences.
Claim 8
Dependent Claim
34 words
A system in accordance with claim 5 wherein the reversible transformation of said transmitted coded output signal by said decoding means is the time inverse of the linear transformation provided by said coding means.
Claim 9
Dependent Claim
54 words
A signal processing system in accordance with claim 1 wherein said coding means comprises delay line means responsive to said input signal for providing a plurality of time distributed intermediate signals; and weighting means responsive to said time distributed intermediate signals for operating on said intermediate signals in accordance with said selected weighting functions.
Claim 10
Dependent Claim
19 words
A signal processing system in accordance with claim 8 wherein said selected weighting functions are derived from Barker sequences.
Claim 11
Dependent Claim
33 words
A signal processing system in accordance with claim 8 wherein said delay line means is a clocked delay line means and includes means for synchronously clocking said delay line with said input signal.
Claim 12
Dependent Claim
33 words
A signal processing system in accordance with claim 8 wherein said delay line means is a clocked delay line means and includes means for asynchronously clocking said delay line with said input signal.
Claim 13
Dependent Claim
20 words
A signal processing system in accordance with claim 1 wherein said selected weighting function is 1, 2, 2, -2, 1.
Claim 14
Dependent Claim
40 words
A signal processing system in accordance with claim 1 wherein said weighting function is -1, -2, -2, -2, -2, 2, 14, 22, 22, 26, 22, -22, -26, 22, 22, -26, 22, -22, 14, -2, -2, 2, 2, -2, 2, -1.
Claim 15
Dependent Claim
39 words
A signal processing system in accordance with claim 1 wherein said weighted function is 1, -2, 2, 2, 1, 2, -4, 4, 4, 2, 2, -4, 4, 4, 2, -2, 4, -4, -4, -2, 1, -2, 2, 2, 1.
Claim 16
Dependent Claim
23 words
A signal processing system in accordance with claim 1 wherein said weighted function is 1, 4, 9, 10, 0, -10, 9, -4, 1.
Claim 17
Independent Claim
186 words
A system for recording data input signals comprising data signal smearing means for linearly transforming said data input signals to produce smeared data output signals in response thereto, said data signal smearing means including coding means responsive to said data input signals for linearly transforming said signals in accordance with a selected time distribution and selected multi-level, integer related weighting functions to produce a plurality of weighted signals, the weighting functions being selected so as to provide a reasonably uniform power distribution of the larger amplitude ones of said plurality of weighted signals and so as to provide a ratio of the peak amplitude of the autocorrelation function of said plurality of weighted signals to the sum of the non-peak amplitudes thereof which is greater than n/(n-1) where n is the number of terms in said plurality of weighted signals; and means responsive to said coding means for combining said weighted signals to produce smeared data output signals; means for recording said smeared data output signals; and desmearing signal processing means responsive to said recorded smeared data output signals for reproducing said data input signals therefrom.
Claim 18
Independent Claim
186 words
A system for recording data input signals comprising data signal smearing means for linearly transforming said data input signals to produce smeared data output signals in response thereto, said data signal smearing means including coding means responsive to said data input signals for linearly transforming said signals in accordance with a selected time distribution and selected multi-level, integer related weighting functions to produce a plurality of weighted signals, the weighting functions being selected so as to provide a reasonably uniform power distribution of the larger amplitude ones of said plurality of weighted signals and so as to provide a ratio of the peak amplitude of the autocorrelation function of said plurality of weighted signals to the sum of the non-peak amplitudes thereof which is greater than n/(n-1) where n is the number of terms in said plurality of weighted signals; and means responsive to said coding means for combining said weighted signals to produce smeared data output signals; means for recording said smeared data output signals; and desmearing signal processing means responsive to said recorded smeared data output signals for reproducing said data input signals therefrom.
Claim 19
Dependent Claim
17 words
A system in accordance with claim 16 wherein said selected weighting functions are derived from Barker sequences.
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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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |