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US 2002/0000875 A1Published application
Separation of plural band pass filters
AssigneeAcoustic Technologies, Inc.
InventorsJustin L. Allen, Samuel L. Thomasson
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Abstract
The separation of a adjacent band pass filters is improved, without changing the filters, by inverting the output signals from alternate filters and not inverting the remaining output signals. All the output signals are then summed. The result is a deeper notch in the frequency response of adjacent filters.
Claims5
An audio processing circuit comprising:
- a plurality of band pass filters;
- a difference amplifier having an inverting input and a non-inverting input;
- wherein alternate band pass filters are coupled to said non-inverting input and the remaining band pass filters are coupled to said inverting input.
A method for improving the frequency separation of a plurality of band pass filters, said method comprising the steps of:
- applying a first signal to the plurality of band pass filters to produce a plurality of output signals;
- inverting the output signal from alternate band pass filters, leaving the remaining output signals non-inverted;
- and
- combining the inverted output signals with the non-inverted output signals.
1 more element
Dependencies are inferred from the claim text.