| 摘要 |
1,198,659. Photo-electric testing. C. FRIEBERGER and H. MALCZYNSKI. June 30, 1967 [June 30, 1966], No.30398/67. Heading G1A. Apparatus for sensing and recording human pulse beats comprises a photo-resistive cell and lamp clamped to the ear lobe to produce pulses (due to light transmission through the blood supply) which are applied, via a capacitor, to an amplifier which produces rectangular pulses to control a recording device. The signals may be transmitted by radio to send pulses of audio frequency, which may be tape recorded or used to control an electric typewriter. A stepping relay and timer may be used to ensure that only pulses in excess of a predetermined frequency are recorded.
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