US3908115A
Expired / Lapsed
US
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Adaptively tuned data receiver
Assignee: Weston Instruments Inc
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Filing: 1974-10-07
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Granted: 1975-09-23
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Expires: 1994-10-07
Abstract
Abstract A data receiver has a digital filter which is adaptively tuned to the instantaneous bit-rate of a received noisy digital signal so as to provide an optimum transfer function despite irregularities in the received signal. A timing signal which reflects the true rate of the received signal adaptively tunes the filter, and sets the bit-rate at which the filter output is digitized. The data receiver output is a digital signal which is a reconstruction of the information content of the received digital signal with low probability of error.
Inventors
- 👤 William N Waggener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:25
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/02; H04L7/033; H04L25/00; H04L25/02; H04L25/0262; H04L7/0016; H04L7/0033; H04L7/0041
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
106 words
A receiver comprising: a filter having a defined transfer function and including a delay line; means for passing an input digital signal through the filter and the delay line to derive a filter output signal resulting from transforming the input signal in accordance with said transfer function; means for deriving a timing signal reflecting the actual rate of the input signal; means for maintaining the delay line tuned in accordance with said timing signal and thus in accordance with the actual rate of the input signal; and means for digitizing the filter output signal in accordance with said timing signal to derive an output digital signal.
Claim 2
Dependent Claim
106 words
A receiver comprising: a filter having a defined transfer function and including a delay line; means for passing an input digital signal through the filter and the delay line to derive a filter output signal resulting from transforming the input signal in accordance with said transfer function; means for deriving a timing signal reflecting the actual rate of the input signal; means for maintaining the delay line tuned in accordance with said timing signal and thus in accordance with the actual rate of the input signal; and means for digitizing the filter output signal in accordance with said timing signal to derive an output digital signal.
Claim 3
Dependent Claim
61 words
A receiver as in claim 1 wherein the means for deriving a timing signal comprises means for comparing the rate of the input signal at the delay line with the rate of the output digital signal to derive a control signal reflecting the comparison, and means for generating said timing signal at a rate reflecting the value of the control signal.
Claim 4
Dependent Claim
42 words
A receiver as in claim 2 wherein the delay line comprises a charge-transfer device operated as an analog delay line and the maintaining means comprises means for clocking the charge-transfer device at a rate determined by the rate of the timing signal.
Claim 5
Dependent Claim
35 words
A receiver as in claim 2 wherein the delay line comprises a charge coupled device and the maintaining means comprises means for clocking the charge coupled device at a rate determined by the timing signal.
Claim 6
Dependent Claim
27 words
A receiver as in claim 2 wherein the input signal is a bit train and each bit thereof is delayed in the delay line by its duration.
Claim 7
Dependent Claim
55 words
A receiver as in claim 2 wherein the comparing means comprises a phase lock loop comparing the phase of the signal which is delayed with the phase of the output digital signal and the generating means comprise means for generating a timing signal which deviates from a preset rate by an amount reflecting the comparison.
Claim 8
Dependent Claim
33 words
A receiver as in claim 1 wherein the means for deriving a timing signal comprises means for comparing the input signal with an exclusive-OR function of the timing signal and the output signal.
Claim 9
Independent Claim
75 words
A system comprising: a filter having a defined transfer function and including a delay line; means for passing an input digital signal through the filter and the delay line to derive a filter output signal resulting from transforming the input signal in accordance with said transfer function; means for deriving a timing signal reflecting the actual rate of the input signal; and means for maintaining the delay line tuned in accordance with said timing signal.
Claim 10
Independent Claim
75 words
A system comprising: a filter having a defined transfer function and including a delay line; means for passing an input digital signal through the filter and the delay line to derive a filter output signal resulting from transforming the input signal in accordance with said transfer function; means for deriving a timing signal reflecting the actual rate of the input signal; and means for maintaining the delay line tuned in accordance with said timing signal.
Claim 11
Dependent Claim
31 words
A system as in claim 8 including means for digitizing the filter output signal at a rate determined by the rate of the timing signal to derive an output digital signal.
Claim 12
Dependent Claim
56 words
A system as in claim 9 wherein the means for deriving a timing signal comprises means for comparing the rate of the input signal with the rate of the output signal to derive a control signal reflecting the comparison and means for generating said timing signal at a rate reflecting the value of the control signal.
Claim 13
Dependent Claim
81 words
A system as in claim 9 wherein the means for deriving a timing signal comprises a phase lock loop comparing the phase of the input digital signal with the phase of the output digital signal to provide a loop output signal at a rate which is an integral multiple of that of the input digital signal, and means for time-dividing the loop output to derive the timing signal for maintaining the delay line tuned and for digitizing the filter output signal.
Claim 14
Dependent Claim
50 words
A system as in claim 9 wherein the means for deriving a timing signal includes means for deriving an exclusive OR function of the timing signal and of the output signal and comparing said exclusive-OR function with the input signal for modifying the timing signal in accordance with the comparison.
Claim 15
Dependent Claim
92 words
A receiver comprising: a delay line delaying an input digital signal; a nonlinear network for transforming the delayed digital signal; a digitizer for digitizing the delayed and transformed input digital signal to provide an output digital signal; means for generating a timing signal; means for controlling the rate of the timing signal as a function of the phase comparison of the input digital signal and an exclusive OR function of the output digital signal and the timing signal; and means for maintaining the delay line tuned in accordance with the timing signal.
Claim 16
Dependent Claim
92 words
A receiver comprising: a delay line delaying an input digital signal; a nonlinear network for transforming the delayed digital signal; a digitizer for digitizing the delayed and transformed input digital signal to provide an output digital signal; means for generating a timing signal; means for controlling the rate of the timing signal as a function of the phase comparison of the input digital signal and an exclusive OR function of the output digital signal and the timing signal; and means for maintaining the delay line tuned in accordance with the timing signal.
Claim 17
Independent Claim
97 words
A method of processing an input digital signal comprising the steps of: passing the input digital signal through a filter having a defined nonlinear transfer function and including a delay line to derive a filter output signal resulting from delaying the input signal in the delay line and transforming it in accordance with the transfer function; deriving a timing signal reflecting the actual rate of the input signal; maintaining the delay line tuned in accordance with the timing signal; and digitizing the filter output signal in accordance with the timing signal to derive an output digital signal.
Claim 18
Independent Claim
97 words
A method of processing an input digital signal comprising the steps of: passing the input digital signal through a filter having a defined nonlinear transfer function and including a delay line to derive a filter output signal resulting from delaying the input signal in the delay line and transforming it in accordance with the transfer function; deriving a timing signal reflecting the actual rate of the input signal; maintaining the delay line tuned in accordance with the timing signal; and digitizing the filter output signal in accordance with the timing signal to derive an output digital signal.
Claim 19
Dependent Claim
56 words
A method as in claim 14 wherein the step of deriving a timing signal comprises the substeps of comparing the input signal with the output signal to derive a control signal reflecting the difference in the rates of the compared signals and generating the timing signal at a rate reflecting the value of the control signal.
Claim 20
Dependent Claim
65 words
A method as in claim 14 wherein the step of deriving the timing signal comprises deriving an exclusive-OR function of the timing signal and the output digital signal and comparing the phase of the exclusive OR function with that of the input signal to derive a control signal reflecting the comparison, and controlling the rate of the timing signal in accordance with said control signal.
Claim 21
Independent Claim
83 words
A method of receiving an input digital signal comprising: delaying the input signal by a delay line and transforming the delayed signal by a defined transfer function; digitizing the transformed digital signal to provide an output digital signal; generating a timing signal whose rate is controlled as a function of a phase comparison of the input digital signal and an exclusive-OR function of the output digital signal and the timing signal; and maintaining the delay line tuned in accordance with the timing signal.
Claim 22
Independent Claim
83 words
A method of receiving an input digital signal comprising: delaying the input signal by a delay line and transforming the delayed signal by a defined transfer function; digitizing the transformed digital signal to provide an output digital signal; generating a timing signal whose rate is controlled as a function of a phase comparison of the input digital signal and an exclusive-OR function of the output digital signal and the timing signal; and maintaining the delay line tuned in accordance with the timing signal.
Claim 23
Independent Claim
128 words
A system receiving an input digital signal and comprising: a matched filter having an element tunable to the bit-rate of the input digital signal, said filter receiving the input digital signal and providing a filter output signal reflecting a defined transfer function; means for generating a control signal from the matched filter which is a function of the bit-rate of the input digital signal; means for tuning the matched filter to the bit-rate of the input digital signal by applying the control signal to the tunable element of the matched filter; means for generating a timing signal at the bit-rate of the input digital signal from the matched filter; and means for digitizing the output of the tuned matched filter at a rate determined by the timing signal.
Claim 24
Independent Claim
128 words
A system receiving an input digital signal and comprising: a matched filter having an element tunable to the bit-rate of the input digital signal, said filter receiving the input digital signal and providing a filter output signal reflecting a defined transfer function; means for generating a control signal from the matched filter which is a function of the bit-rate of the input digital signal; means for tuning the matched filter to the bit-rate of the input digital signal by applying the control signal to the tunable element of the matched filter; means for generating a timing signal at the bit-rate of the input digital signal from the matched filter; and means for digitizing the output of the tuned matched filter at a rate determined by the timing signal.
Claim 25
Independent Claim
124 words
A method of reconstructing a received noisy digital signal with a low probability of error, comprising the steps of: filtering the noisy digital signal in a matched filter having an element tunable to the bit-rate of the noisy digital signal; generating a control signal from the matched filter which is a function of the bit-rate of the noisy digital signal; tuning the matched filter to the bit-rate of the noisy digital signal by applying the control signal to the tunable element of the matched filter; generating a timing signal at the bit-rate of the noisy digital signal from the matched filter; and reconstructing the received digital signal by digitizing the output of the tuned matched filter at a rate determined by the timing signal.
Claim 26
Independent Claim
124 words
A method of reconstructing a received noisy digital signal with a low probability of error, comprising the steps of: filtering the noisy digital signal in a matched filter having an element tunable to the bit-rate of the noisy digital signal; generating a control signal from the matched filter which is a function of the bit-rate of the noisy digital signal; tuning the matched filter to the bit-rate of the noisy digital signal by applying the control signal to the tunable element of the matched filter; generating a timing signal at the bit-rate of the noisy digital signal from the matched filter; and reconstructing the received digital signal by digitizing the output of the tuned matched filter at a rate determined by the timing signal.
Claim 27
Independent Claim
135 words
A system including means for reCeiving a nosiy digital signal and for generating a reconstructed digital signal therefrom, comprising: means including a phase lock loop for comparing the phase of the noisy digital signal and the phase of the reconstructed digital signal and for generating a control signal which is a function of the phase relationship of the of the compared signals; means for applying the control signal to the means for receiving the noisy digital signal and for generating the reconstructed digital signal for tuning the last recited means in accordance with the value of the control signal; means for generating a timing signal from the control signal; and means for synchronizing the bit-rate of the reconstructed digital signal with that of the received noisy digital signal as a function of the control signal.
Claim 28
Independent Claim
135 words
A system including means for reCeiving a nosiy digital signal and for generating a reconstructed digital signal therefrom, comprising: means including a phase lock loop for comparing the phase of the noisy digital signal and the phase of the reconstructed digital signal and for generating a control signal which is a function of the phase relationship of the of the compared signals; means for applying the control signal to the means for receiving the noisy digital signal and for generating the reconstructed digital signal for tuning the last recited means in accordance with the value of the control signal; means for generating a timing signal from the control signal; and means for synchronizing the bit-rate of the reconstructed digital signal with that of the received noisy digital signal as a function of the control signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |