Self-tuning crystal notch filter

Details Self-tuning crystal notch filter Self-tuning crystal notch filter

1998-01-23

2000-04-11

Williams, Hezron

Measuring and testing

Vibration

By mechanical waves

73628, 600447, 600444, 600443, 600921, G01N 2906, G01N 2910

Patent

active

06047601&

ABSTRACT:
A self-tuning crystal notch filter suitable for rejecting a carrier signal in a receiver channel of a receiver of an ultrasound imaging system. The crystal notch filter has a resonant frequency which is electronically tuned. Tuning is done under software control without operator intervention. The software instructs a channel other than the one being tuned to transmit into the transducer. The receive channel being tuned amplifies the received signal and then passes the amplified signal through the notch filter and the TGC amplifier to the corresponding digital signal processing (DSP) circuit via an analog-to-digital converter. The software reads the amplitude of the digital receive signal output from the DSP circuit. By programming a D/A converter incorporated in the notch filter, a value can be found that minimizes the amplitude of the signal output by the DSP circuit, i.e., maximizes the amount of carrier signal being rejected. This value is then used during subsequent imaging data acquisition. This notch filter tuning operation is performed for the respective notch filter in each receive channel.

REFERENCES:
patent: 3868605 (1975-02-01), Poole
patent: 3979684 (1976-09-01), Acker
patent: 4232192 (1980-11-01), Beex
patent: 4313183 (1982-01-01), Saylors
patent: 4947360 (1990-08-01), Dyer
patent: 5030934 (1991-07-01), Kinsman
patent: 5148413 (1992-09-01), Endo et al.
patent: 5226057 (1993-07-01), Boren
patent: 5487389 (1996-01-01), Banjanin et al.
patent: 5664575 (1997-09-01), Banjanin et al.

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