Patent ID: 6999592

Claim:
A cardiac stethoscope device comprising: a stethoscope audio amplifier for producing an audio signal related to cardiac heart sounds produced by a patient, said audio amplifier including first and second manually adjustable filters for enabling selection of a frequency response pass band; an electrocardiogram amplifier for amplifying skin surface potentials of the patient and for producing a corresponding output signal; signal processing means for processing said output signal to produce a synchronization control signal for controlling operation of said stethoscope audio amplifier; switching means for, responsive to said synchronization signal and to a user controlled time interval selection input, selectively controlling blocking and passing of said audio signal produced by said stethoscope audio amplifier so as to provide a time window for aural observation of the heart sounds to the exclusion of the remaining cardiac heart sounds, said signal processing means including: a sweep oscillator for producing an output signal having a sawtooth waveform; and an electronic trigger circuit, connected to said electrocardiogram amplifier and to said sweep oscillator, for controlling resetting of said sweep oscillator based on the output of said electrocardiogram amplifier.