US3772598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission system for the transmission of pulses
Assignee: US Philips Corp
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Filing: 1971-12-07
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Granted: 1973-11-13
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Expires: 1991-12-07
Abstract
Abstract The frequency spectrum of bivalent pulses is modified for transmission as a suppressed carrier single sideband signal. The frequency response shaping network characteristics are sin n pi pi f T, with T being the period of the bivalent pulses, f their frequency and n an integer, including zero. A pilot of the same frequency as the suppressed carrier is transmitted to the receiver which contains an amplitude demodulator and pulse regenerator.
Inventors
- 👤 Gerwen P Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:03
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
A system for the transmission of information in the form of a series of equidistant bivalent pulses, comprising a transmitter and a receiver, said transmitter comprising a source of said bivalent pulses, frequency spectrum modifying transmission network means having an amplitude-frequency characteristic defined by the expression sin n pi fT, wherein T is the period of said bivalent pulses, f is the frequency of signals applied to said network, and n is an integer including zero, means connecting said network to said source, a source of carrier oscillations, amplitude modulator means connected to modulate said oscillations with the output of said network means, means for transmitting only a single sideband including single sideband filter means, means connecting said filter means to the output of said modulator means, means for transmitting the output of said filter means to said receiver, means providing pilot oscillations of the same frequency as said carrier oscillations, and means for adding said pilot oscillations to the signal output of said filter means, said receiver comprising amplitude demodulator means for demodulating signals received thereby, and pulse regenerating means for regenerating pulses from the output of said demodulator means.
Claim 2
Independent Claim
191 words
A system for the transmission of information in the form of a series of equidistant bivalent pulses, comprising a transmitter and a receiver, said transmitter comprising a source of said bivalent pulses, frequency spectrum modifying transmission network means having an amplitude-frequency characteristic defined by the expression sin n pi fT, wherein T is the period of said bivalent pulses, f is the frequency of signals applied to said network, and n is an integer including zero, means connecting said network to said source, a source of carrier oscillations, amplitude modulator means connected to modulate said oscillations with the output of said network means, means for transmitting only a single sideband including single sideband filter means, means connecting said filter means to the output of said modulator means, means for transmitting the output of said filter means to said receiver, means providing pilot oscillations of the same frequency as said carrier oscillations, and means for adding said pilot oscillations to the signal output of said filter means, said receiver comprising amplitude demodulator means for demodulating signals received thereby, and pulse regenerating means for regenerating pulses from the output of said demodulator means.
Claim 3
Dependent Claim
73 words
The system of claim 1 wherein said means in said transmitter for connecting said network to said source comprises pulse transmission means, and said receiver comprises full wave rectifier means, and means connecting said rectifier means between said demodulator means and regenerating means, and said means connecting said network to said source comprises pulse transformation means whereby the pulse output of said rectifier means is the same as said series of bivalent pulses.
Claim 4
Dependent Claim
47 words
The system of claim 1 in which said receiver comprises carrier wave regenerating means connected to produce a regenerated carrier oscillation from received pilot oscillations, and said amplitude demodulator means comprises synchronous demodulator means, and means for applying said regenerated carrier oscillations to said synchronous demodulator means.
Claim 5
Dependent Claim
53 words
The system of claim 1 wherein said receiver comprises level control means connected to control the level of signals applied to said amplitude demodulator means, means connected to the output of said amplitude demodulator means for producing a level control voltage, and means applying said level control voltage to said level control means.
Claim 6
Dependent Claim
32 words
The system of claim 1 wherein said receiver comprises bilateral amplitude discrimination circuit means, means connecting said discrimination circuit means between said demodulator means and regenerator means, a source of clock pulses.
Claim 7
Dependent Claim
73 words
The system of claim 2 wherein said receiver comprises subtracting circuit means connected between said rectifier means and regenerating means, means for deriving a direct level control voltage from the output of said amplitude demodulator means, and means for applying said level control voltage to said subtracting circuit means, whereby the output of said subtraction means has a discrimination level independent of the strength of the signal output of said amplitude demodulator means.
Claim 8
Dependent Claim
20 words
The system of claim 6 comprising bilateral amplitude-limiting circuit means connected between said subtracting circuit means and said regenerating means.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |