Digital tone detector using a ratio of two demodulators of diffe

Details Digital tone detector using a ratio of two demodulators of diffe Digital tone detector using a ratio of two demodulators of diffe

1990-02-05

1991-01-29

Shaw, Dale M.

Boots, shoes, and leggings

G06F 1531

Patent

active

049891693

ABSTRACT:
A digital tone detector receives a modulated input signal selectively containing at least one tone signal component. Two demodulator circuits each demodulate the input signal wherein one demodulator circuit operates at the predetermined frequency of the tone and the other demodulator circuit operates at the second harmonic. When the input tone has a low spectral harmonic power, a ratio of the demodulated outputs of the two demodulators reliably detects the presence of the tone in the input signal.

REFERENCES:
patent: 4021653 (1977-05-01), Sharp et al.
patent: 4297533 (1981-10-01), Gander et al.
patent: 4484035 (1984-10-01), Graham et al.
patent: 4539692 (1985-09-01), Munter
Principles of Communications, Systems, Modulation and Noise, R. E. Ziemer et al., Houghton Mifflin Compar, Second Edition (1985).
EDN, Mar. 21, 1985, "Add DTMF Generation and Decoding to DSP-uP Designs", Patrick Mock, pp. 205-220.

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