JPS6434325A - Endocranial blood flow sound processing apparatus - Google Patents

Abstract

PURPOSE:To detect only abnormal blood flow noise, by mounting a means judging that respiratory sound data and the vibration data of a throat are respectively predetermined values or less, a means of storing the blood flow sound waveform data of one heartbeat and a means of analyzing the blood flow sound waveform data on the basis of a judge signal. CONSTITUTION:Blood flow sound having a plurality of analogue waveforms is detected from the blood flow noise detection means 6 mounted to the head of an examinee 7 and amplified by a blood flow noise amplifying means 9 to be inputted to an A/D converter 12. At the same time, the respiratory sound and throat vabration sound to the blood flow sound are also inputted to a noise mixing judge means 17 from a respiratory sound detection means 16 and a throat vibration sound detection means 18. Only when the inputted respiratory sound and throat vibration sound are sufficiently smaller than preset threshold values, the judge means 17 sends a data effective signal to a buffer memory 14. Since the digital data (blood flow sound waveform data) of one heartbeat is stored in the memory 14, said data is sent to a waveform data analyzing means 15 only when effective to analyze the blood flow sound.