Analog signal translating system with automatic frequency select

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381 98, 381 83, G06F 1520, G06G 762, H03G 500, H04R 2700

Patent

active

046023372

ABSTRACT:
An automatic equalizer and oscillation suppressor system utilizing phase lock loop circuits to detect oscillation candidates at identified frequencies and a low cost microprocessor to process corrective band gain action. Oscillation candidates are initially suppressed by incremental adjustment of band gains to a maximum point after which notch filters are assigned to the oscillating frequency and the band gain returned to its normal equalized value. Automatic equalization is achieved initially with a pink noise source and on an on-going real time basis with program content by use of a frequency addressable narrow band boost circuit which is selectively inserted at frequencies across the bandwidth and band gains adjusted until some oscillation has occurred in all bands or maximum master gain has been reached.

REFERENCES:
patent: 3949325 (1976-04-01), Berkovitz
patent: 4079199 (1978-03-01), Patronis, Jr.
patent: 4088834 (1978-05-01), Thurmond
patent: 4088835 (1978-05-01), Thurmond et al.
patent: 4276604 (1981-06-01), Kitamura et al.
patent: 4316060 (1982-02-01), Adams et al.

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