Patent US3590386A successfully refreshed from Google Patents.
US3590386A
Expired / Lapsed
US
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Receiver for the reception of information pulse signals located in a prescribed transmission band
Assignee: US Philips Corp
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Filing: 1969-10-02
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Granted: 1971-06-29
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Expires: 1989-10-02
Abstract
Abstract A receiver for the reception of synchronous information pulse signals provided with a detection device from which a multilevel information pulse signal can be derived, and a local clock pulse generator, and a clock frequency extractor for recovering the clock frequency for synchronizing the local clock pulse generator. In order to recover the clock frequency in its proper phase from the received information pulse signals themselves, a multilevel information pulse signal derived from the detection device is applied according to the invention to a frequency selective circuit included in the clock frequency extractor which circuit is tuned to half the clock frequency and whose output is connected to a nonlinear circuit acting as a frequency doubler which is connected through a normally open electronic switch to the phase-synchronizing circuit of the local clock pulse generator, the electronic switch being controlled by a control circuit including a threshold device to which a signal derived from the frequency selective circuit a applied to produce a control signal for closing the electronic switch when said derived signal exceeds the threshold value of said threshold device.
Inventors
- 👤 Felix Daniel Tisi
- 👤 Frank De Jager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:35
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/02; H04L7/027; H04L7/033; H04L7/0331
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
219 words
A receiver for the reception of information pulse signals located in a prescribed transmission band, the original information pulses of which coincide with different pulses of a series of equidistant clock pulses, the receiver comprising a detection device for deriving a multilevel information pulse signal, a pulse regenerator controlled by a local clock pulse generator for regenerating the detected information pulses as to shape and instant of occurrence, and a clock frequency extractor for recovering the clock frequency signal from the multilevel signal derived from the detection device, and for applying the recovered clock frequency signal to a phase-synchronizing circuit of the local clock pulse generator, said extractor comprising a frequency selective circuit tuned to half the clock frequency, the input of the selective circuit connected to the output of the detection device, and the output of the selective circuit connected to a nonlinear circuit acting as a frequency doubler, the output of said nonlinear circuit connected to a normally open electronic switch to the phase-synchronizing circuit of the local clock pulse generator, a control circuit for controlling said electronic switch including a threshold device to which a signal derived from said frequency selective circuit is applied for producing a control signal for closing the electronic switch when said derived signal exceeds the threshold value of said threshold device.
Claim 2
Dependent Claim
219 words
A receiver for the reception of information pulse signals located in a prescribed transmission band, the original information pulses of which coincide with different pulses of a series of equidistant clock pulses, the receiver comprising a detection device for deriving a multilevel information pulse signal, a pulse regenerator controlled by a local clock pulse generator for regenerating the detected information pulses as to shape and instant of occurrence, and a clock frequency extractor for recovering the clock frequency signal from the multilevel signal derived from the detection device, and for applying the recovered clock frequency signal to a phase-synchronizing circuit of the local clock pulse generator, said extractor comprising a frequency selective circuit tuned to half the clock frequency, the input of the selective circuit connected to the output of the detection device, and the output of the selective circuit connected to a nonlinear circuit acting as a frequency doubler, the output of said nonlinear circuit connected to a normally open electronic switch to the phase-synchronizing circuit of the local clock pulse generator, a control circuit for controlling said electronic switch including a threshold device to which a signal derived from said frequency selective circuit is applied for producing a control signal for closing the electronic switch when said derived signal exceeds the threshold value of said threshold device.
Claim 3
Dependent Claim
53 words
A receiver as claimed in claim 1, characterized in that the nonlinear circuit is formed by a double-acting limiter connected to the frequency selective circuit and succeeded by a differentiating network for the limited selected signal of half the clock frequency, and a full-wave rectifier whose output is connected to the electronic switch.
Claim 4
Dependent Claim
58 words
A receiver as claimed in claim 1, characterized in that the nonlinear circuit is formed by a full-wave rectifier connected to the frequency selective circuit and succeeded by a further frequency selective circuit tuned to the clock frequency for selection of the signal which is frequency doubled in the rectifier whose output is connected to the electronic switch.
Claim 5
Dependent Claim
23 words
A receiver as claimed in claim 1, characterized in that an amplitude detector is incorporated in the control circuit preceding the threshold device.
Claim 6
Dependent Claim
50 words
A receiver as claimed in claim 1 adapted for the reception of information pulse signals transmitted by using multiphase modulation, and provided with synchronous demodulators fed by a local carrier generator, characterized in that the selective circuit is connected to at least one of the outputs of the synchronous demodulators.
References Cited (Backward Citations)
US3459892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |