US3783410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveborn edge-shifting modulation system for video recording and reproduction
Assignee: JM Huber Corp
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Filing: 1972-01-07
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Granted: 1974-01-01
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Expires: 1992-01-07
Abstract
Abstract A modulation system for generating a train of substantially rectangular pulses, the trailing edges of alternate pulses being delayed by an amount proportional to a modulating signal and the trailing edges of the remaining pulses being advanced by an amount similarly proportional to the modulating signal, in order to provide an output signal in which the carrier and even order sidebands are suppressed and the odd order sidebands have amplitudes given by the odd order Bessel functions of the first kind with arguments dependent on the index of modulation. Optionally, a carrier signal component can be injected into the output signal in a controlled amount independent of the modulating signal by delaying the leading edges of alternate pulses by a predetermined constant amount and advancing the leading edges of the remaining pulses by the same amount.
Inventors
- 👤 G Bruck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:15
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/38; H03C3/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
117 words
Apparatus for modulating a carrier signal by a modulating signal, comprising: means for modulating said carrier signal in accordance with said modulating signal to provide a modulated carrier signal; means for doubling the frequency of said carrier signal to provide a frequency-doubled carrier signal; means for combining said modulated carrier signal and said frequency-doubled carrier signal to provide a combined signal; and means for amplifying and clipping said combined signal so as to provide a train of substantially rectangular pulses, one edge of alternate ones of said pulses being delayed by an amount proportional to said modulating signal and the corresponding edge of the remaining pulses being advanced by an amount similarly proportional to said modulating signal.
Claim 2
Dependent Claim
117 words
Apparatus for modulating a carrier signal by a modulating signal, comprising: means for modulating said carrier signal in accordance with said modulating signal to provide a modulated carrier signal; means for doubling the frequency of said carrier signal to provide a frequency-doubled carrier signal; means for combining said modulated carrier signal and said frequency-doubled carrier signal to provide a combined signal; and means for amplifying and clipping said combined signal so as to provide a train of substantially rectangular pulses, one edge of alternate ones of said pulses being delayed by an amount proportional to said modulating signal and the corresponding edge of the remaining pulses being advanced by an amount similarly proportional to said modulating signal.
Claim 3
Dependent Claim
14 words
The modulating apparatus of claim 1, wherein said modulating means comprises a balanced modulator.
Claim 4
Dependent Claim
24 words
The modulating apparatus of claim 2, wherein said combining means comprises an adder for adding the modulated carrier signal and the frequency-doubled carrier signal.
Claim 5
Dependent Claim
218 words
Apparatus for modulating a carrier signal by a modulating signal, comprising: means for modulating said carrier signal in accordance with said modulating signal to provide a modulated carrier signal; means for doubling the frequency of said carrier signal to provide a frequency-doubled carrier signal; means for providing a phase-shifted carrier signal having a 90* phase relationship to said modulated carrier signal; means for adjusting the level of said phase-shifted carrier signal to a predetermined value; means for combining said modulated carrier signal, said frequency-doubled carrier signal and said phase-shifted carrier signal so as to provide a combined signal; and means for amplifying and clipping said combined signal so as to provide a train of substantially rectangular pulses, each of said rectangular pulses having a first edge and a second edge, the first edges of alternate ones of said pulses being delayed by an amount corresponding to said modulating signal and the first edges of the intervening pulses being advanced by an amount similarly corresponding to said modulating signal, and the second edges of alternate ones of said pulses being delayed by an amount corresponding to said predetermined level value of said phase-shifted carrier signal and the second edges of intervening pulses being advanced by an amount similarly proportional to said predetermined level value of said phase-shifted carrier signal.
Claim 6
Dependent Claim
218 words
Apparatus for modulating a carrier signal by a modulating signal, comprising: means for modulating said carrier signal in accordance with said modulating signal to provide a modulated carrier signal; means for doubling the frequency of said carrier signal to provide a frequency-doubled carrier signal; means for providing a phase-shifted carrier signal having a 90* phase relationship to said modulated carrier signal; means for adjusting the level of said phase-shifted carrier signal to a predetermined value; means for combining said modulated carrier signal, said frequency-doubled carrier signal and said phase-shifted carrier signal so as to provide a combined signal; and means for amplifying and clipping said combined signal so as to provide a train of substantially rectangular pulses, each of said rectangular pulses having a first edge and a second edge, the first edges of alternate ones of said pulses being delayed by an amount corresponding to said modulating signal and the first edges of the intervening pulses being advanced by an amount similarly corresponding to said modulating signal, and the second edges of alternate ones of said pulses being delayed by an amount corresponding to said predetermined level value of said phase-shifted carrier signal and the second edges of intervening pulses being advanced by an amount similarly proportional to said predetermined level value of said phase-shifted carrier signal.
Claim 7
Dependent Claim
14 words
The modulating apparatus of claim 4, wherein said modulating means comprises a balanced modulator.
Claim 8
Dependent Claim
28 words
The modulating apparatus of claim 5, wherein said combining means comprises an adder for adding the modulated carrier signal, the phase-shifted carrier signal and the frequency-doubled carrier signal.
Claim 9
Dependent Claim
24 words
The modulating apparatus of claim 6, further comprising means for alternately gating the modulating carrier signal and the phase-shifted carrier sigNal to said adder.
Claim 10
Dependent Claim
124 words
A modulation system comprising: an oscillator for generating a carrier signal; a modulator connected to said oscillator for modulating said carrier signal in accordance with a modulating signal; a frequency-doubler connected to said oscillator for providing a signal having a frequency twice that of the carrrier signal; an adder connected to said modulator and said frequency-doubler for combining the modulated output of said modulator with said doubled carrier frequency; means responsive to the output signal from said adder to provide a train of substantially rectangular output pulses, one edge of alternate ones of said pulses being delayed by an amount proportional to said modulating signal and the corresponding edge of the remaining pulses being advanced by an amount similarly proportional to said modulating signal.
Claim 11
Dependent Claim
124 words
A modulation system comprising: an oscillator for generating a carrier signal; a modulator connected to said oscillator for modulating said carrier signal in accordance with a modulating signal; a frequency-doubler connected to said oscillator for providing a signal having a frequency twice that of the carrrier signal; an adder connected to said modulator and said frequency-doubler for combining the modulated output of said modulator with said doubled carrier frequency; means responsive to the output signal from said adder to provide a train of substantially rectangular output pulses, one edge of alternate ones of said pulses being delayed by an amount proportional to said modulating signal and the corresponding edge of the remaining pulses being advanced by an amount similarly proportional to said modulating signal.
Claim 12
Dependent Claim
14 words
The modulation system of claim 8, wherein said modulating means comprises a balanced modulator.
Claim 13
Dependent Claim
40 words
The modulation system of claim 9, wherein said means responsive to the output signal from said adder comprises: a bistable circuit; and means responsive to the output signal from said adder for switching said bistable circuit to a first state.
Claim 14
Dependent Claim
131 words
The modulation system of claim 10, further comprising: phase-shifter means connected to said oscillator for providing a phase-shifted carrier signal having a 90* phase relationship to said carrier signal; means for adjusting the level of said phase-shifted carrier signal to a predetermined value; a second adder for adding the phase shifted carrier signal and the frequency doubled carrier signal; and means responsive to the output signal from said second adder for switching said bistable circuit to a second state, whereby the second edge of alternate ones of the rectangular output pulses from said bistable circuit is delayed by an amount proportional to the level of said phase-shifted carrier signal, and the second edge of adjacent pulses being advanced by an amount similarly proportional to the level of said phase-shifted carrier signal.
Claim 15
Dependent Claim
116 words
Apparatus for modulating a carrier signal by a modulating signal, comprising: means for modulating said carrier signal in accordance with said modulating signal to provide a modulated carrier signal, said modulated carrier signal being phase-shifted by an amount proportional to the amplitude of said modulating signal; a frequency doubler for extracting the second harmonic of said carrier signal; means for combining said modulated carrier signal and said second harmonic of said carrier signal to provide a train of waveforms, one edge of alternate ones of said waveforms being delayed by an amount proportional to said modulating signal and the corresponding edge of the remaining waveforms being advanced by an amount similarly proportional to said modulating signal.
Claim 16
Dependent Claim
116 words
Apparatus for modulating a carrier signal by a modulating signal, comprising: means for modulating said carrier signal in accordance with said modulating signal to provide a modulated carrier signal, said modulated carrier signal being phase-shifted by an amount proportional to the amplitude of said modulating signal; a frequency doubler for extracting the second harmonic of said carrier signal; means for combining said modulated carrier signal and said second harmonic of said carrier signal to provide a train of waveforms, one edge of alternate ones of said waveforms being delayed by an amount proportional to said modulating signal and the corresponding edge of the remaining waveforms being advanced by an amount similarly proportional to said modulating signal.
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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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |