Boots – shoes – and leggings
Patent
1980-06-23
1982-04-20
Malzahn, David H.
Boots, shoes, and leggings
G01R 2314
Patent
active
043262619
ABSTRACT:
Circuitry for detecting and estimating the frequency of a tone signal comprises: sampler (20) to discretize the tone signal into samples; discrete-time filter means (21) for processing the samples; control means (30) including oscillator (31) for driving the sampler and clock generating means (32, 33 and 34) for developing a set of clocking signals to sequentially drive the filter means, this set comprising the frequency of the oscillator and preselected submultiples thereof; threshold signal (24) indicative of the strength of the tone signal; comparator (22) for providing a resultant indication of the comparison between the threshold signal and the output of the filter means; and decoder (23) for converting the set of resultant indications obtained sequentially during each clock signal to yield the output estimate. Thus, the circuitry relies on the use of a single discrete-time filter initially driven by a filter that is successively expanded in correspondence to a clock which is successively decimated.
REFERENCES:
patent: 4021653 (1977-05-01), Sharp et al.
patent: 4216463 (1980-08-01), Backof, Jr. et al.
Cappellini "Digital Filtering with Sampled Signal Spectrum Frequency Shift", Proceedings of the IEEE, Feb. 1969, pp. 241-242.
Capellini et al., "A Special-Purpose On-Line Processor for Bandpass Analysis", IEEE Trans. on Audio & Electroacoustics, Jun. 1970, pp. 188-194.
Malzahn David H.
Nimtz R. O.
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