Abstract: A noise-canceling biological sound monitoring system provides electronic noise cancellation at the pickup head by using a primary transducer to sense anatomy sounds and a secondary sensor as a noise monitor. The system philosophy emphasizes the capability to provide the medical practitioner with an improved signal-to-noise ratio while at the same time maintaining the character of the sound to which the practitioner is accustomed. Various embodiments of the system include a device for use as an amplifying aid with conventional stethoscopes and a system which provides telemetry of sound to a remote receiver for listening, analysis or recording.