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Patent US4313088A successfully refreshed from Google Patents.
US4313088A
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US
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Arrangement for generating a clock signal
Assignee: US Philips Corp
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Filing: 1980-04-07
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Granted: 1982-01-26
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Expires: 2000-04-07
Abstract
Abstract Arrangement for clock signal generation from a received data signal located in baseband, for use in baseband modems. In addition to signal transitions which provide clock information in a reliable manner, several types of data signals contain disturbing signal transitions. These disturbing transitions are eliminated by converting the spectrum of the received data signal into the spectrum of a bi-phase modulated signal. It is possible to obtain a reliable clock signal from the signal transitions of the converted signal with small acquisition times.
Inventors
- 👤 Petrus J. VAN Gerwen
- 👤 Wilfred A. M. Snijders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:51
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/02; H04L7/027
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
An arrangement for generating a clock signal from a received data signal located in a base band, comprising a zero-crossing detector having connected thereto a frequency-selective device from which the clock signal is derived, characterized in that means are provided between the input for the received data signal and the zero-crossing detector for converting the spectrum of the received data signal into the spectrum of a bi-phase modulated signal having the bit rate as the carrier frequency and a carrier which is in-phase with the data signal.
Claim 2
Dependent Claim
87 words
An arrangement for generating a clock signal from a received data signal located in a base band, comprising a zero-crossing detector having connected thereto a frequency-selective device from which the clock signal is derived, characterized in that means are provided between the input for the received data signal and the zero-crossing detector for converting the spectrum of the received data signal into the spectrum of a bi-phase modulated signal having the bit rate as the carrier frequency and a carrier which is in-phase with the data signal.
Claim 3
Dependent Claim
54 words
An arrangement as claimed in claim 1, characterized in that the means are formed by a low-pass filter having a cut-off frequency which is twice the bit rate, whose filter characteristic has zeros at 0 Hz and at the cut-off frequency and a sinusoidal variation between these zeros, and an integrator connected in cascade.
Claim 4
Dependent Claim
55 words
An arrangement as claimed in claim 1, characterized in that the means are formed by a low-pass filter having a cut-off frequency which is twice the bit rate, whose filter characteristic has a maximum at 0 Hz and a zero at the cut-off frequency and a cosinusoidal variation between 0 Hz and the cut-off frequency.
References Cited (Backward Citations)
US3500215A
Cited
US3916084A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |