Measuring and testing – Vibration – By mechanical waves
Patent
1996-10-30
1998-11-03
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
673626, 600437, 600443, 600444, 600447, G01N 2906, A61B 800
Patent
active
058311688
ABSTRACT:
In an ultrasound signal processor, respective received signals received at received signal processing units are sampled by a sampling clock of a frequency which is sufficiently higher than a Nyquist sampling frequency of an upper limit of a frequency band width for each of the received signals received at the received signal processing units so as to be digitized. Each of the digitized received signals is multiplied by a reference signal of a predetermined frequency to produce converted received signals in which the frequency of the digital received signal waveform is shifted, and converted signals are cumulated for a time which is longer than the sampling period. Each of the cumulated signals is processed by a clock frequency lower than the sampling clock in connection with an ultrasound beam in one direction, so that after one transmission operation of ultrasound, a plurality of ultrasound received beams are formed from the received signals received at the respective transducers.
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Katakura Kageyoshi
Masuzawa Hiroshi
Miwa Yuichi
Shinomura Ryuichi
Hitachi Medical Corporation
Miller Rose M.
Williams Hezron E.
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