Audio signal processors
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United States of America Patent
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Oct 23, 2007
Grant Date -
N/A
app pub date -
Jan 8, 1999
filing date -
Jan 12, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An audio signal processor includes a tone control (23). The tone control comprises two low-pass filters (221, 222) operating in current-mode and a subtractor (223) which subtracts the output currents of the filters to produce a band-pass characteristic. Each filter is a tuneable log-domain current-mode filter comprising MOS transistors operating in weak inversion. The tone control is useful in audio signal processors, hearing aids and single-channel and multi-channel Cochlear implants.
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