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FOETAL_HEART_BEAT_DETECTOR

2014-11-01 05:15  
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FOETAL_HEART_BEAT_DETECTOR
Amplified 2- to 3-cps signal from foetal heart modulates transistor oscillator operating between 800 and 1,200 cps. Frequency modulation technique overcomes poor low-frequency response of human ear and loudspeaker. A-c coupled stages have large lime constants, to give required low-frequency response.-T. I. Humphreys, Transistor Unit Detects Foetal Heart Sounds, Electronics, 31:17, p 52-54.