US3701026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Median frequency generator
Assignee: United States Department of the Army
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Filing: 1971-05-13
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Granted: 1972-10-24
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Expires: 1991-05-13
Abstract
Abstract The median frequency generator linearly adds two input signals having the same amplitude to obtain a third signal having a frequency equal to the median of the frequencies of the two input signals, an amplitude which varies with time, and a phase which reverses at a frequency equal to the difference in the frequencies of the input signals. Timing pulses are generated by a flip-flop in synchronism with the phase reversals and are used as gating signals to invert the phase reversed portions of the third signal to produce the median frequency output signal.
Inventors
- 👤 Frank S Gutleber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:05
CPC Classifications
H; H03; H03B; H03B21/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
199 words
A device for generating an output signal having a frequency which is the median of the frequencies of a pair of original input signals comprising: adder means for receiving said original input signals and for generating a sum signal having a frequency equal to said median frequency and phase reversal points occurring at a frequency equal to one-half the difference between the frequencies of said input signals; timing means connected to the output of said adder means for detecting the locations of said phase reversal points and for generating timing signals in response thereto including limiter means for providing a limited replica of said sum signal, delay means connected to the output of said limiter means for delaying the output signal thereof one-half cycle, and adder means having two inputs, one connected to the output of said delay means and the other connected to the output of said limiter means, for producing a series of spaced pulses at said phase reversal points; and transmitting means including phase reversal means responsive to said timing signal for selectively inverting the phase of said sum signal to remove said phase reversal points and for transmitting said sum signal at said median frequency.
Claim 2
Independent Claim
199 words
A device for generating an output signal having a frequency which is the median of the frequencies of a pair of original input signals comprising: adder means for receiving said original input signals and for generating a sum signal having a frequency equal to said median frequency and phase reversal points occurring at a frequency equal to one-half the difference between the frequencies of said input signals; timing means connected to the output of said adder means for detecting the locations of said phase reversal points and for generating timing signals in response thereto including limiter means for providing a limited replica of said sum signal, delay means connected to the output of said limiter means for delaying the output signal thereof one-half cycle, and adder means having two inputs, one connected to the output of said delay means and the other connected to the output of said limiter means, for producing a series of spaced pulses at said phase reversal points; and transmitting means including phase reversal means responsive to said timing signal for selectively inverting the phase of said sum signal to remove said phase reversal points and for transmitting said sum signal at said median frequency.
Claim 3
Dependent Claim
128 words
The device according to claim 1 and wherein said transmission means includes: an inverter means connected to the output of said limiter means for reversing the phase of said limited sum signal to provide an inverted limited sum signal; first and second transmission gate means each having a transmission input and a gating input and having the transmission inputs thereof connected to the outputs of said inverter means and said limiter means respectively for transmitting said sum signal and said inverted sum signal upon receiving a gating pulse at said gating inputs; and gating pulse means responsive to said timing means and connected to said gating inputs for generating said gating pulses whereby said transmission gates alternately transmit said limited sum signal and said inverted limited sum signal.
Claim 4
Independent Claim
269 words
A device for generating an output signal having a frequency which is the median of the frequencies of a pair of original input signals comprising: first adder means for linearly adding said original input signals; limiter means connected to the output of said first adder means for removing variations in the absolute value of the amplitude of the output signal of said adder means; delay means connected to the output of said limiter means for delaying one-half cycle the output signal thereof; second adder means for linearly adding the outputs of said limiter and said delay means for producing a series of spaced trigger pulses; bistable multivibrator mans having the input thereof connectEd to the output of said second adder means and responsive to said trigger pulses for providing complimentary gating pulses at the outputs thereof; inverter means connected to the output of said limiter means for inverting the output signal of said limiter means; first transmission gate means connected to one of said multivibrator outputs and the output signal of said inverter means for transmitting the output of said inverter means in response to one of said complimentary gating pulses; second transmission gate means connected to the other of said multivibrator outputs and the output of said hard limiter means for transmitting the output signal of said hard limiter means in response to the other of said complimentary gating pulses; and third adder means for linearly adding the outputs of said first and second transmission gate means for producing a signal having a frequency which is the median of the frequencies of said pair of original input signals.
Claim 5
Independent Claim
269 words
A device for generating an output signal having a frequency which is the median of the frequencies of a pair of original input signals comprising: first adder means for linearly adding said original input signals; limiter means connected to the output of said first adder means for removing variations in the absolute value of the amplitude of the output signal of said adder means; delay means connected to the output of said limiter means for delaying one-half cycle the output signal thereof; second adder means for linearly adding the outputs of said limiter and said delay means for producing a series of spaced trigger pulses; bistable multivibrator mans having the input thereof connectEd to the output of said second adder means and responsive to said trigger pulses for providing complimentary gating pulses at the outputs thereof; inverter means connected to the output of said limiter means for inverting the output signal of said limiter means; first transmission gate means connected to one of said multivibrator outputs and the output signal of said inverter means for transmitting the output of said inverter means in response to one of said complimentary gating pulses; second transmission gate means connected to the other of said multivibrator outputs and the output of said hard limiter means for transmitting the output signal of said hard limiter means in response to the other of said complimentary gating pulses; and third adder means for linearly adding the outputs of said first and second transmission gate means for producing a signal having a frequency which is the median of the frequencies of said pair of original input 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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |