Frequency synthesizer apparatus and method in ultrasonic imaging
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United States of America Patent
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Feb 17, 1981
Issued Date -
N/A
app pub date -
Dec 18, 1978
filing date -
Feb 21, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A frequency program synthesizing apparatus and method is disclosed for controlling delay circuitry in ultrasonic imaging systems. Each frequency program synthesizer includes an adjustable frequency source for producing the clocking signals and a multichannel memory having a plurality of address channels each allocated for digitally storing a signal representing the frequency corresponding to one of said frequency program steps and circuitry for applying the stored signals in a sequence to cause the adjustable frequency generator to produce the frequency program. Each program synthesizer also includes updating circuitry for adjusting the values of the stored digital frequency representations to compensate for undesirable differences between the frequency of the generated program and a set of predetermined program frequency steps.
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