Detection of tones in sampled signals

Details Detection of tones in sampled signals Detection of tones in sampled signals

1980-10-28

1982-12-07

Smith, Jerry

Boots, shoes, and leggings

179 84VF, 364728, G06F 1531, H04M 150

Patent

active

043631002

ABSTRACT:
A tone detector in the form of a digital correlator is disclosed in which PCM signal samples are delayed in a RAM for the correlation period. Using PROMs, the products of the current and delayed samples with samples of a sine signal at the frequency to be detected are produced, and their difference is cumulatively summed to produce a first accumulated signal. A second accumulated signal is similarly produced using samples of a cosine signal at the frequency to be detected, and an output signal indicating the presence or absence of the tone is produced from the sum of the squares of the two accumulated signals. The use of memories enables the detector to be readily multiplexed for detection of a plurality of tones on each of a plurality of channels.

REFERENCES:
patent: 4001521 (1977-01-01), Fukata et al.
patent: 4038540 (1977-07-01), Roberts
patent: 4100378 (1978-07-01), Claasen et al.
patent: 4109109 (1978-08-01), Molleron
patent: 4164036 (1979-08-01), Wax
A Digital Signal Processor for PCM/TDM Tone Decoding, by M. S. Buser, Proc. Eurocon 77, Venice, Italy, May 1977, pp. 2.5.5.1 to 2.5.5.6.
Simple Multifrequency-Tone Detector, by A. D. Proudfoot, Electronics Letters, vol. 8, No. 21, Oct. 19, 1972, pp. 525 and 526.
A Digital Receiver for Tone Detection Applications, by T. A. C. M. Claasen and J. B. H. Peek, IEEE Transactions on Communications, vol. COM-24, No. 12, Dec. 1976, pp. 1291 to 1300.
J. P. Mills, "Digital MF Receiver Technique," GTE Automatic Electric Journal, May 1977, pp. 317-325.

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