US3568067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency discriminator with output indicative of difference between input and local reference signals
Assignee: Collins Radio Co
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Filing: 1969-06-13
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Granted: 1971-03-02
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Expires: 1989-06-13
Abstract
Abstract A first means extracts the difference frequency components of the input signal (fin) and a first reference signal (Fr). A second means extracts the difference frequency components of said input signal and a second reference signal in phase quadrature with the first reference signal. The two difference frequency signals are separately differentiated. Then the output from each of the two differentiators is multiplied by the input to the other differentiator to provide two output signals. A difference amplifier takes the difference between these two output signals to provide a signal in accordance with the expression WHERE D theta 1DT IS THE RATE OF CHANGE OF PHASE BETWEEN THE INPUT SIGNAL AND THE REFERENCE SIGNAL.
Inventors
- 👤 Jerry G Williford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:37
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/14; H04L27/144; H04L27/152; H04L27/1525
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
232 words
Frequency discriminator means for detecting frequency variation of an input signal and comprising: first and second signal paths each comprising in cascade arrangement: first mixer means; filter means; differentiator means; and second mixer means; means for supplying first and second reference signals in pHase quadrature to said first mixer means of said first and second signal paths, respectively; means for supplying said input signal to each of said first mixer means; said first mixer means of said first and second signal paths responsive to said reference signal supplied thereto and to said input signal to produce the difference frequencies of said reference and input signals; said filter means in each of said circuit paths constructed to pass said difference frequencies to the differentiator cascaded therewith; means for supplying the output of each of said filter means to the second mixer means in the other signal path; said second mixer means of each of said signal paths responsive to the output of the differentiator cascaded therewith and the output of the filter of the other signal path to produce, respectively, first and second output signals; and difference generating means responsive to said first and second output signals to produce a third output signal whose amplitude and polarity are indicative of the direction and the rate of change of the frequency of said input signal with respect to the frequency of said reference signal.
Claim 2
Dependent Claim
232 words
Frequency discriminator means for detecting frequency variation of an input signal and comprising: first and second signal paths each comprising in cascade arrangement: first mixer means; filter means; differentiator means; and second mixer means; means for supplying first and second reference signals in pHase quadrature to said first mixer means of said first and second signal paths, respectively; means for supplying said input signal to each of said first mixer means; said first mixer means of said first and second signal paths responsive to said reference signal supplied thereto and to said input signal to produce the difference frequencies of said reference and input signals; said filter means in each of said circuit paths constructed to pass said difference frequencies to the differentiator cascaded therewith; means for supplying the output of each of said filter means to the second mixer means in the other signal path; said second mixer means of each of said signal paths responsive to the output of the differentiator cascaded therewith and the output of the filter of the other signal path to produce, respectively, first and second output signals; and difference generating means responsive to said first and second output signals to produce a third output signal whose amplitude and polarity are indicative of the direction and the rate of change of the frequency of said input signal with respect to the frequency of said reference signal.
Claim 3
Dependent Claim
195 words
Frequency discriminator means for detecting frequency variation of an input signal from a nominal frequency fr, and comprising: first and second circuit paths each having first and second input means; means for generating and supplying a first reference signal q frequency fr to said first input means of said first circuit path, and a second reference signal in phase quadrature with said first reference signal to the first input means of said second circuit path; means for supplying saId input signal to the second input means of said first and second circuit paths; said first and second circuit paths each comprising in cascade arrangement: means connected to said first and second input means for extracting the difference frequencies between said input signal and the applied reference signal; means for differentiating the output of said extracting means; and means connected to said differentiating means and the extracting means of the other circuit path for mixing the output signals from the differentiating means cascaded therewith and the output of said extracting means from the other circuit means; and means for taking the difference between the output signals of the mixers of said first and second circuit means.
Claim 4
Dependent Claim
195 words
Frequency discriminator means for detecting frequency variation of an input signal from a nominal frequency fr, and comprising: first and second circuit paths each having first and second input means; means for generating and supplying a first reference signal q frequency fr to said first input means of said first circuit path, and a second reference signal in phase quadrature with said first reference signal to the first input means of said second circuit path; means for supplying saId input signal to the second input means of said first and second circuit paths; said first and second circuit paths each comprising in cascade arrangement: means connected to said first and second input means for extracting the difference frequencies between said input signal and the applied reference signal; means for differentiating the output of said extracting means; and means connected to said differentiating means and the extracting means of the other circuit path for mixing the output signals from the differentiating means cascaded therewith and the output of said extracting means from the other circuit means; and means for taking the difference between the output signals of the mixers of said first and second circuit means.
Claim 5
Dependent Claim
207 words
Frequency discriminator means for detecting frequency variation of an input signal and comprising: first and second signal paths each comprising in cascade arrangement: first mixer means; filter means; differentiator means; and second mixer means; means for supplying said input signal to each of said first mixer means; means for supplying first and second reference signals, in phase quadrature, to each of said first mixer means, respectively; each of said first mixer means responsive to said reference signal supplied thereto and to said input signal to produce the difference frequencies of said reference and input signals; said filter means in each of said signal paths constructed to pass said difference frequencies to the differentiator means in the same signal path; each of said second mixer means responsive to the output signal of the differentiator in the same signal path and the output signal of the filter of the other signal path to produce, respectively, first and second product output signals; and difference amplifier means responsive to said first and second product output signals to produce a final output signal whose amplitude and polarity are indicative of the direction and rate of change of the frequency of said input signal with respect to the frequency of said reference signal.
Claim 6
Dependent Claim
207 words
Frequency discriminator means for detecting frequency variation of an input signal and comprising: first and second signal paths each comprising in cascade arrangement: first mixer means; filter means; differentiator means; and second mixer means; means for supplying said input signal to each of said first mixer means; means for supplying first and second reference signals, in phase quadrature, to each of said first mixer means, respectively; each of said first mixer means responsive to said reference signal supplied thereto and to said input signal to produce the difference frequencies of said reference and input signals; said filter means in each of said signal paths constructed to pass said difference frequencies to the differentiator means in the same signal path; each of said second mixer means responsive to the output signal of the differentiator in the same signal path and the output signal of the filter of the other signal path to produce, respectively, first and second product output signals; and difference amplifier means responsive to said first and second product output signals to produce a final output signal whose amplitude and polarity are indicative of the direction and rate of change of the frequency of said input signal with respect to the frequency of said reference signal.
Claim 7
Independent Claim
164 words
A method of determining the relation between the frequency of an input signal and the frequency of a reference signal comprising the steps of: producing first and Second forms of said reference signal in phase quadrature; producing difference frequencies between said input signal and said first and second forms of said reference signal, respectively; extracting a first signal having components of the difference frequencies of said input signal and said first reference signal; extracting a second signal having components of the difference frequencies of said input signal and said second reference signal; differentiating said first and second extracted signals to produce first and second output signals, respectively; multiplying said first extracted signal by said second output signal and said second extracted signal by said first output signal to produce third and fourth output signals; and taking the difference of said third and fourth output signals to provide a fifth output signal having characteristics which define the frequency relation between said input and reference signals.
Claim 8
Independent Claim
164 words
A method of determining the relation between the frequency of an input signal and the frequency of a reference signal comprising the steps of: producing first and Second forms of said reference signal in phase quadrature; producing difference frequencies between said input signal and said first and second forms of said reference signal, respectively; extracting a first signal having components of the difference frequencies of said input signal and said first reference signal; extracting a second signal having components of the difference frequencies of said input signal and said second reference signal; differentiating said first and second extracted signals to produce first and second output signals, respectively; multiplying said first extracted signal by said second output signal and said second extracted signal by said first output signal to produce third and fourth output signals; and taking the difference of said third and fourth output signals to provide a fifth output signal having characteristics which define the frequency relation between said input and reference signals.
Claim 9
Independent Claim
135 words
A method of determining the relation between the frequency of an input signal and the frequency of a first reference signal comprising the steps of: generating a second reference signal in phase quadrature with said first reference signal; multiplying said input signal by said first reference signal to produce first signals of sum and difference frequencies; multiplying said input signal by said second reference signal to produce second signals of sum and difference frequencies; separately filtering said first and second signals to pass those signals of said difference frequencies only; separately differentiating said fist and second signals of said difference frequencies; multiplying the differentiated first and second signals by said second and first signals of said difference frequencies, respectively, to produce third and fourth signals; and taking the difference between said third and fourth signals.
Claim 10
Independent Claim
135 words
A method of determining the relation between the frequency of an input signal and the frequency of a first reference signal comprising the steps of: generating a second reference signal in phase quadrature with said first reference signal; multiplying said input signal by said first reference signal to produce first signals of sum and difference frequencies; multiplying said input signal by said second reference signal to produce second signals of sum and difference frequencies; separately filtering said first and second signals to pass those signals of said difference frequencies only; separately differentiating said fist and second signals of said difference frequencies; multiplying the differentiated first and second signals by said second and first signals of said difference frequencies, respectively, to produce third and fourth signals; and taking the difference between said third and fourth signals.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |