Frequency control system in an audio device

Details Frequency control system in an audio device Frequency control system in an audio device

1993-04-20

1994-08-09

Isen, Forester W.

Electrical audio signal processing systems and devices

Including frequency control

Having automatic equalizer circuit

381102, H03G 500

Patent

active

053373685

ABSTRACT:
A frequency control system in an audio system has a low frequency band pass filter for deriving a low frequency component from an audio signal obtained from the audio system, and a high frequency band pass filter for deriving a high frequency component. A comparator is provided for comparing the level of the high frequency component with the level of the low frequency component, thereby producing a deviation of the high frequency component from a l/f fluctuation. The audio signal is corrected with a correcting value to the l/f fluctuation dependent on the deviation.

REFERENCES:
patent: 3292116 (1966-12-01), Walker et al.
patent: 4939782 (1990-07-01), Gambacurta, Jr. et al.
patent: 5172358 (1992-12-01), Kimura

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