US4860307A
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Synchronization pulse generator in spread spectrum communication system
Assignee: Kenwood KK
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Filing: 1987-10-09
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Granted: 1989-08-22
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Expires: 2007-10-09
Abstract
Abstract A synchronization pulse generator in a spectrum spread communication system includes first and second envelope detectors for subjecting a correlation output of a spectrum spread signal to envelope detection; a threshold value generator for generating a threshold value having a level corresponding to an output from the second envelope detector; and a comparator for comparing an output level of the first envelope detector with a threshold value generated by the threshold value generator, and outputting an initial synchronization pulse.
Inventors
- 👤 Shigeyuki Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:53
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/70712
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A synchronization pulse generator in a spectrum spread communication system comprising: first and second envelope detectors for subjecting a correlation output of a spectrum spread signal to envelope detection, a time constant in the second envelope detector being larger than a time constant of the first envelope detector; threshold value generator means for generating a threshold value having a level corresponding to an output from the second envelope detector; and a comparator for comparing an output level of the first envelope detector with a threshold value generated by the threshold value generator means, and outputting an initial synchronization pulse.
Claim 2
Dependent Claim
99 words
A synchronization pulse generator in a spectrum spread communication system comprising: first and second envelope detectors for subjecting a correlation output of a spectrum spread signal to envelope detection, a time constant in the second envelope detector being larger than a time constant of the first envelope detector; threshold value generator means for generating a threshold value having a level corresponding to an output from the second envelope detector; and a comparator for comparing an output level of the first envelope detector with a threshold value generated by the threshold value generator means, and outputting an initial synchronization pulse.
Claim 3
Dependent Claim
47 words
A synchronization pulse generator in a spectrum spread communication system according to claim 1, wherein said threshold value generator means comprises a rheostat for generating a DC output, and an adder for adding a DC output from said rheostat to an output from said second envelope detector.
Claim 4
Dependent Claim
33 words
A synchronization pulse generator in a spectrum spread communication system according to claim 1, the time constant of said second envelope detector is 1000 to 10000 times that of said first envelope detector.
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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) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |