US5138632A
Expired / Lapsed
US
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Correlation pulse generating circuit
Assignee: Faurecia Clarion Electronics Co Ltd
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Filing: 1990-11-28
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Granted: 1992-08-11
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Expires: 2010-11-28
Abstract
Abstract A correlation pulse generating circuit uses a delay circuit for delaying an output of an absolute value detecting circuit corresponding to an A/D-converted output of a correlation spike, so that amplitude information of a current correlation spike can be used for detection of the correlation spike.
Inventors
- 👤 Yoshitaka Uchida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:15
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
154 words
A correlation pulse generating circuit used in a spread spectrum receiver for obtaining a correlation pulse from a correlation spike obtained by correlating a received signal with a reference signal in a correlator, comprising: an A/D converting circuit for A/D-converting said correlation spike; an absolute value detecting circuit for detecting an absolute value of an output of said A/D converting circuit; a peak value detecting circuit for detecting a value corresponding to a peak of an output of said absolute value detecting circuit; a threshold value setting circuit responsive to an output of said peak value detecting circuit for generating a threshold value signal; a first delay circuit for delaying the output of said absolute value detecting circuit by one period of said correlation spike; and a comparing circuit for comparing an output of said delay circuit with said threshold value signal and for generating a correlation pulse in accordance with the comparison result.
Claim 2
Dependent Claim
154 words
A correlation pulse generating circuit used in a spread spectrum receiver for obtaining a correlation pulse from a correlation spike obtained by correlating a received signal with a reference signal in a correlator, comprising: an A/D converting circuit for A/D-converting said correlation spike; an absolute value detecting circuit for detecting an absolute value of an output of said A/D converting circuit; a peak value detecting circuit for detecting a value corresponding to a peak of an output of said absolute value detecting circuit; a threshold value setting circuit responsive to an output of said peak value detecting circuit for generating a threshold value signal; a first delay circuit for delaying the output of said absolute value detecting circuit by one period of said correlation spike; and a comparing circuit for comparing an output of said delay circuit with said threshold value signal and for generating a correlation pulse in accordance with the comparison result.
Claim 3
Dependent Claim
34 words
The correlation pulse generating circuit according to claim 1 further comprising a second delay circuit for delaying the output of said A/D converting circuit and for obtaining the most significant bit of the output.
Claim 4
Dependent Claim
25 words
The correlation pulse generating circuit according to claim 2 wherein said second delay circuit delays to input signal by one period of said correlation spike.
Claim 5
Dependent Claim
38 words
The correlation pulse generating circuit according to claim 2 wherein said first and second delay circuits are each composed of a shift register em as its clock a sampling signal used for sampling by said A/D converting circuit.
Claim 6
Dependent Claim
38 words
The correlation pulse generating circuit according to claim 3 wherein said first and second delay circuits are each composed of a shift register employing as its clock a sampling signal used for sampling by said A/D converting circuit.
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) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |