Real time multitask electronic stethoscopy system

Claim 2

An electronic stethoscopy system comprising a plurality of stethoscopes and a remote unit which communicates with said plurality of stethoscopes, each stethoscope also communicating with each other stethoscope and including: a pick-up circuit including a microphone for transforming detected sound into an electric signal, an amplifier for amplifying said electric signal and filters for removing noise in said electric signal; transmitting and receiving circuits including an emphasizer receiving, via a first switch, the amplified and filtered signal from said pick-up circuit for emphasizing high frequencies, a modulator for modulating the emphasized signal for transmission, a demodulator for demodulating an input signal received from the remote unit or another stethoscope, and a deemphasizer for deemphasizing high frequencies in the demodulated signal; and a binaural earpiece having speakers selectively connected, via a second switch, to the amplified and filtered signal from said pick-up circuit or to the deemphasized signal from said receiving circuit, wherein the detected sound from one stethoscope may be received by another stethoscope communicating therewith so as to enable co-listening by one or more users of said one and another stethoscopes.

Claim 3

An electronic stethoscopy system as in claim 1, wherein said remote unit comprises: a receiving circuit including a demodulator for demodulating a signal received from one of said plurality of stethoscopes, a deemphasizer for deemphasizing high frequencies and a bandpass filter for passing audible frequencies; a bandpass filter bank for dividing a signal received from said receiving circuit into several audio bands and of respectively transforming each signal of each audio band into a digital signal representing energy of that band at a certain time, said bandpass filter bank including a plurality of narrow-band filters for extracting a certain frequency component from the received signal as an audio band, a plurality of full-wave retifiers for transforming said audio bands into d.c. signals, a plurality of lowpass filters for filtering out high frequency noise in said d.c. signals, and a plurality of A/D converters for converting said filtered d.c. signals into digital signals, whereby a continuous received signal can be expressed as discrete parameters from each audio band at discrete time intervals; means connected to said receiving circuit for detecting the rate of the signal waveform of said received signal; processing means for receiving the discrete parameters from said bandpass filter bank and an output of said rate detecting means for forming a pattern from the discrete parameters, comparing said formed pattern with other predetermined patterns representative of particular symptoms, and storing said formed and predetermined patterns in a data base along with criteria for pattern comparison; and output and transmitting means for outputting said formed pattern or other symptom-related data outputted by said processing means in accordance with said comparison, including a D/A converter and an amplifier for converting the output of said processing means into an analog signal and amplifying said analog signal, and an emphasizer and a modulator for respectively emphasizing high frequencies of said analog signal and then modulating said analog signal for transmission.

Claim 4

An electronic stethoscopy system as in claim 2, wherein each of said stethoscopes further includes a control-signal generator for generating several different signals selected by a switch set, and a third switch for seletively connecting said control signals or said amplified and filtered signal from said pick-up circuit to said transmitting circuit of said stethoscope, said control signals including signals for controlling said processing means of said remote unit and for selecting predetermined data stored in said data base.