Portable electro-phonocardiograph using magnetic tape recorder equipped with patient's voice print.

A newly devised instrument is described which permits recording of cardiovascular sound and electrocardiogram during exercise in man. It consists of a handy magnetic casette tape recorder and a modulator. This assembly is connected to a phonocardiographic microphone which is attached to the thorax with sticky tape. The voice of patient is also recordable, if necessary. Biological transducer will be attached for simultaneous recording. All of the recording will be inscribed on the oscillograph paper. It is demonstrated that the recording is stable even during exercise and represents satisfactory result. Prospect of this instrument is briefly discussed.