Abstract: A noise rejecting electronic sphygmomanometer comprises a conventional cuff-type sphygmomanometer having an inflatable bladder and pressure monitoring manometer connected thereto. A first microphone, having a sound pickup directed inwardly to be toward a patient's arm when the cuff is installed thereabout, is provided for picking up Korotkoff sounds as the cuff is deflated and blood flow in a patient's arm resumes. To avoid spurious indications caused by background sounds, a second microphone, having a pickup directed to pickup background noises, is also provided within the cuff. The outputs of both microphones are fed into electronic discrimination circuitry.