Patent US3999130A successfully refreshed from Google Patents.
US3999130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic frequency translator for use with a delay/amplitude equalizer
Assignee: Magnavox Electronic Systems Co
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Filing: 1975-02-21
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Granted: 1976-12-21
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Expires: 1995-02-21
Abstract
Abstract Apparatus for use with a controller of a delay/amplitude equalizer. The disclosed apparatus supplies a reference signal with a frequency offset component identical in amplitude and phase to an offset frequency of the received signal. The availability of a received signal and a reference signal permits setting tap weight in the tapped delay line of the transversal filter of a delay/amplitude equalizer.
Inventors
- 👤 Norman L. Whisler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:30
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H03; H03D; H03D7/00; H03D7/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
183 words
Apparatus for providing a reference signal with an offset frequency component of a received signal, comprising: means for providing a phase-locked loop, said means for providing a phase-locked loop having an output providing a signal with a combination of a given frequency component and an offset frequency component; means for determining whether said combination frequency is greater than said given frequency, said means for determining connected to the output of said means for providing; means for generating a first and a second sinusoidal signal of said offset frequency, said means for generating being connected to the output of said means for providing; first modulator means for combining the first sinusoidal signal of said offset frequency with a reference signal; a π/2 degree phase shifter that produces a phase shifted reference signal and having an output; second modulator means for combining the second sinusoidal component of said offset frequency with the phase shifted reference signal; and means for combining output signals from said first modulator means and said second modulator means responsive to signals from said determining means for use with a delay/amplitude equalizer.
Claim 2
Dependent Claim
183 words
Apparatus for providing a reference signal with an offset frequency component of a received signal, comprising: means for providing a phase-locked loop, said means for providing a phase-locked loop having an output providing a signal with a combination of a given frequency component and an offset frequency component; means for determining whether said combination frequency is greater than said given frequency, said means for determining connected to the output of said means for providing; means for generating a first and a second sinusoidal signal of said offset frequency, said means for generating being connected to the output of said means for providing; first modulator means for combining the first sinusoidal signal of said offset frequency with a reference signal; a π/2 degree phase shifter that produces a phase shifted reference signal and having an output; second modulator means for combining the second sinusoidal component of said offset frequency with the phase shifted reference signal; and means for combining output signals from said first modulator means and said second modulator means responsive to signals from said determining means for use with a delay/amplitude equalizer.
Claim 3
Dependent Claim
148 words
Apparatus for providing a reference signal with an offset frequency component of a received signal, comprising: means for providing a phase-locked loop for a signal with a frequency determined by a combination of a reference frequency and an offset frequency, said means for providing including means for modulating a signal of said reference frequency with a sinusoidal signal of said offset frequency; first modulator means for combining a second reference signal with a first signal of said offset frequency provided by said means for providing; a phase shifter for phase shifting the second reference signal a predetermined amount; second modulator means for combining the phase-shifted reference signal with a second signal of said offset frequency provided by said means for providing; and means for combining an output signal of said first combining means with an output signal of said second combining means for use in a delay/amplitude equalizer.
Claim 4
Dependent Claim
148 words
Apparatus for providing a reference signal with an offset frequency component of a received signal, comprising: means for providing a phase-locked loop for a signal with a frequency determined by a combination of a reference frequency and an offset frequency, said means for providing including means for modulating a signal of said reference frequency with a sinusoidal signal of said offset frequency; first modulator means for combining a second reference signal with a first signal of said offset frequency provided by said means for providing; a phase shifter for phase shifting the second reference signal a predetermined amount; second modulator means for combining the phase-shifted reference signal with a second signal of said offset frequency provided by said means for providing; and means for combining an output signal of said first combining means with an output signal of said second combining means for use in a delay/amplitude equalizer.
Claim 5
Dependent Claim
131 words
An automatic frequency translator for use with a delay/amplitude equalizer having as an input a received signal with a frequency offset, the translator comprising: a phase-locked loop that has as an input the received signal with a frequency offset, the phase-locked loop having a reference oscillator and a sine/cosine generator to generate a sine function of the offset frequency and a cosine function of the offset frequency; a first modulator that combines the cosine function with a reference signal; a phase shifter that shifts the reference signal a predetermined amount to produce a phase shifted reference signal; a second modulator that combines the sine function with the phase shifted reference signal; and means to sum the first modulator and second modulator outputs to produce a signal for use with the equalizer.
Claim 6
Dependent Claim
131 words
An automatic frequency translator for use with a delay/amplitude equalizer having as an input a received signal with a frequency offset, the translator comprising: a phase-locked loop that has as an input the received signal with a frequency offset, the phase-locked loop having a reference oscillator and a sine/cosine generator to generate a sine function of the offset frequency and a cosine function of the offset frequency; a first modulator that combines the cosine function with a reference signal; a phase shifter that shifts the reference signal a predetermined amount to produce a phase shifted reference signal; a second modulator that combines the sine function with the phase shifted reference signal; and means to sum the first modulator and second modulator outputs to produce a signal for use with the equalizer.
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) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |