Direct reading sinad meter

Details Direct reading sinad meter Direct reading sinad meter

1976-08-17

1978-01-10

Griffin, Robert L.

325398, 325473, 325 67, G01R 2700

Patent

active

040681769

ABSTRACT:
The disclosed circuitry accepts from a radio receiver under test audio signals consisting of the signal plus noise and distortion (S + N + D), levels, and subtracts from it a separately generated signal (- S) corresponding in frequency and amplitude to the audio signal without noise and distortion. The resulting absolute value of noise plus distortion (N + D) is applied to a meter which may be calibrated to indicate the SINAD ratio.

REFERENCES:
patent: 2589662 (1952-03-01), Bjornson
patent: 2959672 (1960-11-01), Haise
patent: 3122704 (1964-02-01), Jones
patent: 3387222 (1968-06-01), Hellwarth et al.
patent: 3506915 (1970-04-01), Harris et al.
patent: 3631344 (1971-12-01), Greenwald
patent: 3835378 (1974-09-01), Edden et al.

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