周波数解析を用いた顎関節音の定量的な解析法に関する研究 第2報 周波数解析結果の定量化

  • 永田 和裕
    日本歯科大学新潟歯学部歯科補綴学教室第1講座
  • 旗手 敏
    日本歯科大学新潟歯学部歯科補綴学教室第1講座

書誌事項

タイトル別名
  • Studies of the Quantitative Analysis of Temporomandibular Joint Sounds Using Spectral Analysis. Part 2. Quantizing for Spectral Analysis.
  • Part 2. Quantizing for Spectral Analysis
  • 第2報周波数解析結果の定量化

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抄録

The method of quantitative frequency analysis for TMJ sounds was studied. Since the frequency analysis was strongly affected by some analyzing conditions, these conditions were studied.<BR>The subjects were divided into groups according to the pathological state and TMJ sound, and the analyzing conditions for differentiating the groups were selected.<BR>The results were as follows:<BR>1. It was necessary to apply over 6 kHz of sampling frequency to enhance the potential for differentiating TMJ sounds.<BR>2. There were no specific relationships between spectrum patterns, pathological states and TMJ sounds.<BR>3. A spectrum peak for TMJ sounds was present in the bass register, but frequency components tended to decrease with higher pitched sounds. Therefore, it is suggested that TMJ sounds should be evaluated with 2 parameters-(a) maximum frequency, and (b) FFT integrated value.<BR>4. As for optimal analyzing conditions, amplitude spectrum, unused window, and 3 mV cut off level should be combined.

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