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MONITORING OF FOSTER HEART ACTIVITY
专利权人:
HUNTLEIGH TECHNOLOGY LIMITED
发明人:
JACKSON, ROY
申请号:
DK09785651
公开号:
DK2346408T3
申请日:
2009.09.16
申请国别(地区):
DK
年份:
2014
代理人:
摘要:
A transmit amplifier (12) drives an ultrasound transducer (11) to emit a pulse, and a receive amplifier (13) amplifies the echo signal detected by the transducer. The receive amplifier's gate opens a fixed delay after the end of the transmit pulse, and a demodulator (14) multiplies the received signal by the local oscillator signal. A low-pass filter removes the sum of the frequencies and passes the difference of the frequencies (the received signal's Doppler frequency) to be digitized by an ADC. ADC readings are made for each of several range bins in intervals during the receive gate-open interval. One or two of the Doppler audio signals will contain the signal from the fetal heart. When a periodic signal is found, its rate is tested to see if it lies within or outside the typical range of a fetal heart.
来源网站:
中国工程科技知识中心
来源网址:
http://www.ckcest.cn/home/

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