Unaliased quadrature audio synthesizer

Details Unaliased quadrature audio synthesizer Unaliased quadrature audio synthesizer

1984-04-19

1986-08-26

Howell, Kyle L.

Surgery

Truss

Pad

7386125, A61B 1000

Patent

active

046076425

ABSTRACT:
The apparatus described unaliases a Doppler signal which is related to the velocity of blood flowing in a sample volume. It then generates an audio output corresponding to the unaliased Doppler signal. The device generates an unaliased, instantaneous signal which corresponds to the Doppler frequency associated with the blood velocity in the sample volume. That unaliased instantaneous frequency is fed into programmable read only memories (PROMs) which provide digitized values for the sine and cosine functions. Those values are fed into digital-to-analog converters, and they are scaled to provide audio outputs.

REFERENCES:
Hoeks, A. P. G., "On The Development of a Multi-Gate Pulsed Doppler System with Serial Data Processing", Thesis, U. of Linburg, Netherlands, presented 5 Mar. 1982.

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