Acoustical stethoscope with electrical filter
First Claim
1. A stethoscope comprising an acoustic membrane pick-up for receiving sounds connected directly to acoustic earpieces by an acoustic conduit, an electrical pick-up mounted to respond to said sounds, an amplifier responsive to said electrical pick-up, an electro - acoustic emitter responsive to said amplifier for transmitting rhythmic sounds to said earpieces simultaneously with sounds from said acoustic membrane pick-up, further characterized in that said electro-acoustic emitter is connected to the electrical pick-up by way of a bandpass filter, followed by a threshold device, the threshold device being connected to an audible frequency generator which causes said acoustic emitter to emit said rhythmic sounds as soon as the level of sounds perceived by the electrical pick-up lying in the passband of the filter exceeds a well-determined threshold.
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Abstract
The stethoscope comprises a membrane (2) sensor (1) connected by a tube (3) to ear-pieces (8 & 9). The tube (3) traverses a casing (10) containing an electrical unit connected by a cable (12) to an electrical sensor (11). The electrical unit is sensitive to a given frequency range and comprises an electro-acoustic emitter (19) supplying acoustic signals into conduit (3) which are obtained in response to signals coming from the sensor (11) according to a predetermined scheme.
25 Citations
6 Claims
- 1. A stethoscope comprising an acoustic membrane pick-up for receiving sounds connected directly to acoustic earpieces by an acoustic conduit, an electrical pick-up mounted to respond to said sounds, an amplifier responsive to said electrical pick-up, an electro - acoustic emitter responsive to said amplifier for transmitting rhythmic sounds to said earpieces simultaneously with sounds from said acoustic membrane pick-up, further characterized in that said electro-acoustic emitter is connected to the electrical pick-up by way of a bandpass filter, followed by a threshold device, the threshold device being connected to an audible frequency generator which causes said acoustic emitter to emit said rhythmic sounds as soon as the level of sounds perceived by the electrical pick-up lying in the passband of the filter exceeds a well-determined threshold.
Specification