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US 6,404,278 B2Granted
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.
Claims7
An audio processing circuit comprising:
- a common input;
- a plurality of band pass filters having progressively higher center frequencies;
- an amplifier having an inverting input, an output, and a non-inverting input;
- wherein alternate band pass filters are coupled between said common input and said non-inverting input and the remaining band pass filters are coupled between said common input and said inverting input.
1 more element
A method for improving the frequency separation of a plurality of band pass filters having progressively higher center frequencies, 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
A filter bank comprising:
- a common input;
- at least three band pass filters having progressively higher center frequencies;
- an amplifier having an inverting input, an output, and a non-inverting input;
- wherein at least one band pass filter is coupled between said common input and said inverting input and the remaining band pass filters are coupled between said common input and said non-inverting input;
- and
- wherein the output from the amplifier is a filtered signal.
3 more elements
Dependencies are inferred from the claim text.