The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 1989
Filed:
Sep. 16, 1987
Nobuo Yamazaki, Otawara, JP;
Kabushiki Kaisha Toshiba, Kanagawa, JP;
Abstract
An ultrasonic blood stream observing apparatus based on a pulse Doppler method utilizing as a transmission, a high frequency pulse signal. The frequency f.sub.PRF of a transmission pulse repetition signal and the frequency f.sub.R of a reference signal used for demodulating a Doppler component of an observed signal, are synchronized to each other. The frequency f.sub.PRF is a harmonic frequency. The output of an oscillator is frequency-divided to produce the transmission pulse repetition signal. A frequency multiplier generates an output signal used as the reference signal, synchronized to the transmission pulse repetition signal. The frequency multiplier frequency multiplies by n its input signal obtained directly or indirectly from the oscillator.