Heart-beat electronic simulator

• US 3,994,282 A
• Filed: 04/10/1975
• Issued: 11/30/1976
• Est. Priority Date: 09/12/1974
• Status: Expired due to Term

• Current Assignee: Bioengineering Resources, Inc.
• Original Assignee: Bioengineering Resources, Inc.
• Inventors: Moulet, Camille
• Primary Examiner(s): Mancene, Louis G.
• Assistant Examiner(s): Cutting, Robert F.
• Application Number:
  US05/566,742
• Time in Patent Office: 600 Days
• Field of Search: 35/17, 128/1 C, 46/232
• US Class Current: 600/28
• CPC Class Codes: A61M 2021/0027 by the hearing sense
• CPC Class Codes: A61M 2021/0061 Simulated heartbeat pulsed or modulated
• CPC Class Codes: A61M 21/00 Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis
• CPC Class Codes: G04F 5/025 Electronic metronomes rhytem generation for electrophonic musical instruments G10H1/36
• CPC Class Codes: G10K 15/02 Synthesis of acoustic waves synthesis of speech G10L13/00
• CPC Class Codes: H03K 3/023 by the use of differential amplifiers or comparators, with internal or external positive feedback

Abstract

An electronic device for simulating the human heart-beating noise comprises an astatic multivibrator, the output of which is a square wave voltage signal. This signal is given as an input to a differentiating circuit having its output connected to drive a loudspeaker diaphgram. The acoustic wave produced is similar to the human heart-beating noise.

Claims

1. A heart-beat simulator comprising an astatic multivibrator with predetermined period and cycle ratio for providing a square wave output signal, a differentiating circuit having as its input the square wave output signal from said multivibrator for transducing said square wave input to an output signal comprising, substantially symmetrical periodic pulses decreasing from positive and negative peaks to zero, and a loudspeaker driven by the output signal from said differentiating circuit.

2. The heart-beat simulator of claim 1 also including a power supply for direct current.

3. The heart-beat simulator of claim 1, wherein said astatic multivibrator has a period of about 750 ms with voltage transitions at about 300 ms and 450 ms.

4. The heart-beat simulator of claim 3, wherein said loudspeaker has a diaphragm with relaxation frequencies of about 130 Hz.

5. The heart-beat simulator of claim 1 wherein said differentiating circuit includes an R-C circuit and a capacitor in series and wherein said loudspeaker is connected in parallel with said capacitor.

6. A heart-beat simulator comprising an astatic multivibrator having an output with a predetermined period including two square wave pulses, the time duration between pulses of the period being longer than the time duration between the second pulse of any one period and the first pulse of the succeeding period, circuit means for differentiating the output of said multivibrator and a loudspeaker driven by the output of said differentiating circuit means, said differentiating circuit means including two R-C circuits in series, the second of said R-C circuits feeding said loudspeaker.

7. The heart-beat simulator of claim 6 wherein the second of said R-C circuits includes a capacitor in parallel with the resistance of said loudspeaker.