Tone-control circuit and method for conditioning respective frequency bands of an audio signal
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United States of America Patent
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May 9, 2006
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N/A
app pub date -
Jun 15, 1999
filing date -
Jun 15, 1999
priority date (Note) -
Expired
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Abstract
An audio tone-control circuit includes 4.sup.th-order low-pass, 4.sup.th-order band-pass, and 4.sup.th-order high-pass filter circuits. The 4.sup.th-order low-pass filter circuit has a first phase response and receives and filters an audio signal and generates a first output signal therefrom. The 4.sup.th-order band-pass filter circuit has a second phase response that is substantially equal to the first phase response and receives and filters the audio signal to generate a second output signal. The 4.sup.th-order high-pass filter circuit has a third phase response substantially equal to the first and second phase responses and receives and filters the audio signal to generate a third output signal. The audio-signal circuit also includes a combining circuit that combines the first, second and third output signals into a combined signal. Furthermore, the filter circuits may be 2.sup.nd-order filter circuits instead of 4.sup.th-order filter circuits.
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