Digital tone detector

Details Digital tone detector Digital tone detector

1993-03-09

1993-12-28

Mai, Tan V.

Boots, shoes, and leggings

G06F 1531

Patent

active

052745791

ABSTRACT:
A digital tone detector utilizes pseudo sinusoidal quadrature reference signals in combination with a unique summation rule for summing the resultant quadrature accumulations to obtain a substantial improvement in the sidelobe responses of the filter. The digital tone detector also utilizes a "stepped" observation window to further provide a substantial improvement in the third harmonic response of the filter. The digital tone detector can be implemented using a hardware implementation, a combination hardware and microprocessor implementation, and a microprocessor only implementation.

REFERENCES:
patent: 3803390 (1974-04-01), Schaepman
patent: 4021653 (1977-05-01), Sharp et al.
patent: 4038540 (1977-07-01), Roberts
patent: 4216463 (1980-08-01), Backof et al.
patent: 4302817 (1981-11-01), Labedz
patent: 4513385 (1985-04-01), Muri
"A Digital Receiver for Tone Detection Applications" by Theo A. C. M. Claasen and J. B. H. Peek in the IEEE Transactions on Communications, vol. 24, No. 12, Dec. 1976 pp. 1291-1300.

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