Digital comb filter

Details Digital comb filter Digital comb filter

1991-05-23

1994-06-14

Harvey, Jack B.

Boots, shoes, and leggings

364574, 36472407, G06F 1531

Patent

active

053216431

ABSTRACT:
A digital comb filter includes a period measurement circuit, a subtracter, a first adder, a first memory and a first multiplier. The period measurement circuit outputs difference signals representing differences between periods of target and input pulses. The subtracter subtracts a first deviation signal of the first multiplier from the difference signal of the period measurement circuit. The first adder adds a first accumulation signal of the first memory to the output of the subtracter. The first memory latches the output of the first adder, and the first multiplier multiplies the first accumulation signal by a first coefficient. The digital comb filter also includes a second adder, a second memory, a second multiplier and a third adder. The second adder adds a second accumulation signal of the second memory to the output of the first adder. The second memory latches the output of the second adder. The second multiplier multiplies the second accumulation signal from the second memory by a second coefficient. The third adder adds the output from the subtracter to a second deviation signal from the second multiplier.

REFERENCES:
"New Software Servo System with a Single-Chip Microprocessor for VCRs", by Tomitaka et al., IEEE Transactions on Consumer Electronics, Aug. 1988, vol. 34, No. 3, pp. 571-579.

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