Electrical audio signal processing systems and devices – Including phase control
Patent
1991-12-17
1993-08-03
Isen, Forester W.
Electrical audio signal processing systems and devices
Including phase control
381 98, 381 17, 381 682, 381 684, H03G 500
Patent
active
052336654
ABSTRACT:
An audio equalizer system includes a filter having a passband extending substantially continuously across the audio spectrum, with the filter having an input terminal and an output terminal. An input network is adapted to apply an input audio signal to the input terminal of the filter, and an output network is adapted to provide an output audio signal representative of the signal at the output terminal of the filter. The group delay of the filter varies continuously with frequency across the audio spectrum, with that group delay being relatively high but less than approximately 10 milliseconds at frequencies less than approximately 200 Hz and being relatively low but greater than or equal to zero at frequencies greater than approximately 8000 Hz. When configured as a hearing assistance system, an input audio transducer, or microphone, generates the audio input signal from an incident acoustic wave, and an output audio transducer, or speaker, produces an output acoustic wave from the output audio signal.
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Harrison James L.
Vaughn Gary L.
Isen Forester W.
Vaughn Gary L.
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