Proportional bandwidth frequency analyzer
Abstract
Abstract A SIGNAL PROCESSING METHOD FOR THE REAL-TIME ANALYSIS OF FREQUENCY COMPONENTS WITHIN AN INPUT SIGNAL EMPLOYS LOWPASS FILTER MEANS CAPABLE OF PASSING AT LEAST THE HIGHEST FREQUENCY TO BE ANALYZED, THE FILTERED INPUT SIGNALS ARE SAMPLED AT A RATE EQUAL TO OR GREATER THAN THE NYQUIST RATE FOR THE HIGHEST FREQUENCY TO BE ANALYZED. THE SAMPLED SIGNAL DATA IS THEN STORED IN AN APPROPRIATE MEANS AND THE STORED DATA IS CAUSED TO BE REPETITIVELY READ OUT AT VARIABLE RATES WHICH ARE GREATER THAN THE SAMPLING RATE WHEREBY FREQUENCY MULTIPLICATION FACTORS ARE PRODUCED AS A FUNCTION OF THE INSTANTANEOUS READOUT RATE AND THE SAMPLING RATE. A FIXED BANDWIDTH FILTER RECEIVES THE READOUT DATA, THE CENTER FREQUENCY OF THE FILTER BEING EQUAL TO THE PRODUCT OF THE INSTANTANEOUS FREQUENCY BEING ANALYLED AND THE INSTANEOUS MULTIPLICATION FACTOR, FURTHER SAMPLING MEANS MAY BE ARRANGED TO RECEIVE THE OUTPUTS OF THE FIXED BAND WIDTH FILTER AND A OPERATE AT A RAGE WHICH IS A FUNCTION OF THE VARIABLE RATE READING OUT THE STORED DATA FOR PRODUCING SAMPLE DATA WITHIN A SELECTED FREQUENCY SPECTRUM TO BE ANALYZED.
Inventors
- 👤 Robert Halley
- 👤 Robert J Bolam
- 👤 Carroll W Marshall
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |