Frequency synthesizer apparatus and method in ultrasonic imaging

Details Frequency synthesizer apparatus and method in ultrasonic imaging Frequency synthesizer apparatus and method in ultrasonic imaging

1978-12-18

1981-02-17

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 328 14, H03L 708

Patent

active

042517796

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.

REFERENCES:
patent: 3806826 (1974-03-01), Schlosser
patent: 3825855 (1974-07-01), Bassett et al.
patent: 3890871 (1975-06-01), Oberheim
patent: 4123724 (1978-10-01), Das et al.

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