Tone detector with pseudo phase locked loop

Details Tone detector with pseudo phase locked loop Tone detector with pseudo phase locked loop

1985-02-28

1986-10-21

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 58, 179 84VF, 324 79D, 328139, H04H 500

Patent

active

046189815

ABSTRACT:
The tone detector provides accurate detection of a single predetermined tone frequency within a mixture of frequencies, utilizing a carrier signal source at a relatively high frequency. The high frequency signal is divided down to two frequencies, one just above and one just below the tone. The divider output is then maintained at the frequency of the tone by continuously adjusting the divisor number between the two divisor values. Multiplying the received signal or a portion thereof by the divider output provides a detect signal when the tone is present in the received signal with sufficient amplitude.

REFERENCES:
patent: 4021653 (1977-05-01), Sharp et al.
patent: 4344038 (1982-08-01), Streeter
patent: 4367444 (1983-01-01), Gardner et al.
patent: 4368356 (1983-01-01), Ecklund et al.
patent: 4377728 (1983-03-01), Hilbert
patent: 4405897 (1983-09-01), Taylor et al.
patent: 4520503 (1985-05-01), Kirst et al.

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