Signal processing circuit and ultrasound doppler apparatus
First Claim
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1. A signal processing circuit comprising:
- a plurality of amplifying circuits for respectively amplifying a plurality of continuous wave input signals, and outputting each respective pair of amplified signals that have mutually opposite phases for each continuous wave input signal;
a plurality of selecting circuits, each of which selects one signal of said pair of amplified signals from each of said plurality of amplifying circuits; and
a matrix switch having a plurality of mutually crossing signal input paths and signal output paths, and switches provided one at every intersection of said signal input paths and signal output paths, in which the output signals from said plurality of selecting circuits are led respectively to said plurality of signal input paths.
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Abstract
In order to arrange continuous wave signal paths using fewer switches, a plurality of amplifying circuits 602 for respectively amplifying a plurality of continuous wave input signals, and outputting each respective pair of amplified signals that have mutually opposite phases for each continuous wave input signal; a plurality of selecting circuits 604, each of which selects one signal of the pair of amplified signals from each of the plurality of amplifying circuits; and a matrix switch 608 employing the output signals from the plurality of selecting circuits as input signals are provided.
20 Citations
22 Claims
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1. A signal processing circuit comprising:
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a plurality of amplifying circuits for respectively amplifying a plurality of continuous wave input signals, and outputting each respective pair of amplified signals that have mutually opposite phases for each continuous wave input signal;
a plurality of selecting circuits, each of which selects one signal of said pair of amplified signals from each of said plurality of amplifying circuits; and
a matrix switch having a plurality of mutually crossing signal input paths and signal output paths, and switches provided one at every intersection of said signal input paths and signal output paths, in which the output signals from said plurality of selecting circuits are led respectively to said plurality of signal input paths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 16, 17, 19)
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12. A signal processing circuit comprising:
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a signal delay line;
matching resistors connected respectively to both ends of said signal delay line;
a plurality of signal input taps drawn out from different positions along said signal delay line;
signal output tap drawn out from at least one end of said signal delay line;
a series circuit of a switch and a resistor connected in parallel to each of said matching resistors; and
a series circuit of a capacitor and a switch provided between each end of said signal delay line and ground and between each of the drawn-out positions of said plurality of signal input taps and ground.
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14. An ultrasound Doppler apparatus comprising:
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ultrasound transmitting/receiving means for transmitting continuous wave ultrasound and receiving echoes of said continuous wave ultrasound by a plurality of ultrasonic transducers;
a plurality of amplifying means for respectively amplifying a plurality of continuous wave input signals led from said plurality of ultrasonic transducers, and outputting each respective pair of amplified signals that have mutually opposite phases for each continuous wave input signal;
a plurality of selecting means, each of which selects one signal of said pair of amplified signals from each of said plurality of amplifying means;
signal path arranging means having a plurality of mutually crossing signal input paths and signal output paths, and switches provided one at every intersection of said signal input paths and signal output paths, in which the output signals from said plurality of selecting means are led respectively to said plurality of signal input paths;
signal delay means having a plurality of signal input taps drawn out from different positions along a signal delay line and a signal output tap drawn out from at least one end of said signal delay line, in which the signals from said plurality of signal output paths of said signal path arranging means are led respectively to said plurality of signal input taps;
control means for controlling said selecting means and said switches in said signal path arranging means;
Doppler processing means for calculating a Doppler shift of said echoes based on the signal led from said signal output tap of said signal delay means; and
display means for displaying said calculated Doppler shift. - View Dependent Claims (18, 20, 21, 22)
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Specification