Reciprocal, subtractive, audio spectrum equalizer
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United States of America Patent
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-
Jan 2, 1990
Grant Date -
N/A
app pub date -
Feb 22, 1988
filing date -
Feb 22, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An equalizer circuit is disclosed having adjustable bandpass filters connected with operational amplifiers in feedforward and feedback paths so as to form frequency selective boost and cut signal components, which are then combined to form the equalized output signal by a subtractive operation with a direct unfiltered signal path arranged in parallel with the filtered feedforward and feedback paths. The circuit exhibits a constant-Q operation in that it can be adjusted for selected frequency boost and cut without distortion of the component bandwidths of the individual filters.
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