Signal synthesizer

Details Signal synthesizer Signal synthesizer

1985-10-31

1988-12-27

Chin, Gary

Boots, shoes, and leggings

307491, 364607, 364851, 364480, G01C 2500, G06F 1520, G06G 716

Patent

active

047945524

ABSTRACT:
A signal synthesizer is provided for producing pulses simulating characteristics of echo pulses generated during ultrasonic scanning so that the simulated pulses can be used in the calibration of equipment for processing the outputs of ultrasonic transducers. The synthesizer produces an envelope signal of selectively variable amplitude and rise and fall time and multiplies this envelope respectively with a high frequency pulse train and a substantially zero amplitude signal in a dual matched multiplier so that the subtractively combined outputs of the multiplier are free of unwanted feedthrough components introduced by the mulitplier.

REFERENCES:
patent: 4099240 (1978-07-01), Rode et al.
patent: 4204261 (1980-05-01), Ruszala et al.
patent: 4316259 (1982-02-01), Albrecht et al.
patent: 4355367 (1982-10-01), Masuzawa et al.
patent: 4373394 (1983-02-01), Renzel et al.
patent: 4391124 (1983-07-01), Drost et al.
patent: 4438466 (1984-03-01), Fawkes et al.
patent: 4581585 (1986-04-01), Bristol

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