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US 2002/0000874 A1Published application
Band pass filter with improved group delay
AssigneeAcoustic Technologies, Inc.
InventorSamuel L. Thomasson
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Abstract
An electrical signal is applied to a band pass filter, a first notch filter, and a second notch filter in any order. The center frequencies of the notch filters straddle the pass band of the band pass filter. The notch filters improve group delay and steepen the skirts of the response curve of the band pass filter.
Claims9
A filter characterized by a band pass frequency response and a short, relatively uniform group delay, said filter comprising:
- an input;
- an output;
- a band pass filter, a first notch filter, and a second notch filter coupled in series in any sequence between said input and said output, wherein the center frequency of the first notch filter is below the pass band of the band pass filter and the center frequency of the second notch filter is above the pass band of the band pass filter.
A method for processing an electrical signal, said method comprising the steps of:
- applying the electrical signal to a band pass filter to produce a first output signal;
- applying the first output signal to a first notch filter to produce a second output signal;
- and
- applying the second output signal to a second notch filter to produce a third output signal.
1 more element
Dependencies are inferred from the claim text.