US4993044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spread-spectrum communication receiver
Assignee: Faurecia Clarion Electronics Co Ltd
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Filing: 1989-08-30
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Granted: 1991-02-12
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Expires: 2009-08-30
Abstract
Abstract A spread-spectrum communication receiver uses two convolvers and a phase shifter to demodulate data from correlation outputs of the convolvers. The demodulated output is used to control the phase-shifting amount of the phase-shifter and gains of the correlation outputs.
Inventors
- 👤 Shigeo Akazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:28
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/70712
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A spread-spectrum communication receiver comprising: a first route including first correlating means; a second route including a phase shifter and second correlating means; a first switch for selectively applying an input signal or a CW signal to said first and second correlating means; demodulating means for demodulating data, based on outputs of said first and second correlating means; a phase control circuit for controlling the phase-shifting amount of said phase shifter; an AGC circuit responsive to said demodulating means to control gains of said outputs of both said correlating means; and means for locking said gains.
Claim 2
Dependent Claim
96 words
A spread-spectrum communication receiver comprising: a first route including first correlating means; a second route including a phase shifter and second correlating means; a first switch for selectively applying an input signal or a CW signal to said first and second correlating means; demodulating means for demodulating data, based on outputs of said first and second correlating means; a phase control circuit for controlling the phase-shifting amount of said phase shifter; an AGC circuit responsive to said demodulating means to control gains of said outputs of both said correlating means; and means for locking said gains.
Claim 3
Dependent Claim
33 words
The spread-spectrum communication receiver according to claim 1 wherein said lock means is a second switch for selectively applying an output of said AGC circuit or a predetermined signal to both said amplifiers.
Claim 4
Dependent Claim
37 words
The spread-spectrum communication receiver according to claim 1 wherein said lock means is a third switch for selectively applying an output of said demodulating means via a low-pass filter or a predetermined signal to said AGC circuit.
Claim 5
Dependent Claim
18 words
The spread-spectrum communication receiver according to claim 1 wherein said lock means is linked to said first switch.
References Cited (Backward Citations)
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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) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |