Phonocardiographies

《英文msh詞典》Phonocardiographies
[入口詞] Phonocardiographies
[主題詞] Phonocardiography
[英文釋義] Graphic registration of the heart sounds picked up as vibrations and transformed by a piezoelectric crystal microphone into a varying electrical output according to the stresses imposed by the sound waves. The electrical output is amplified by a stethograph amplifier and recorded by a device incorporated into the electrocardiograph or by a multichannel recording machine.