Low-power DSP squelch

Details Low-power DSP squelch Low-power DSP squelch

1989-09-01

1991-06-11

Kuntz, Curtis

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455222, 455337, 455343, 375103, H04B 110

Patent

active

050239406

ABSTRACT:
An improved method of statistically determining the presence of noise on an FM communications channel permits digital signal processing techniques to more reliably squelch unnecesssary segments of an FM receiver reducing noise and power consumption. Digital samples of an FM signal having real (in-phase) and imaginary (phase quadrature) components representing the real and imaginary components of a phasor rotating about the origin of a Cartesian coordinate system at a rate indicative of a signal on the channel are mathematically operated on. Successive digital samples are multiplied by the complex conjugate of temporally adjacent samples producing a new stream of phasors representative of the phase change between samples. The phase changes between samples are processed to produce a number that indicates the probability of the channel having noise present. This number indicative of the probability of noise content is compared to a threshold value and used to decide whether or not successive receiver stages should be squalched or unsquelched.

REFERENCES:
patent: 4117410 (1978-09-01), Bender
patent: 4603300 (1986-07-01), Welles, II et al.
patent: 4618967 (1986-10-01), Vance et al.
patent: 4704582 (1987-11-01), Dixon et al.

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