Method for analyzing tone quality of exhaust sound
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United States of America Patent
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Mar 17, 2009
Grant Date -
May 29, 2008
app pub date -
Jun 28, 2005
filing date -
Jul 26, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
According to evaluation of tone quality of exhaust sound adapted to human audition, a characteristic of the tone quality of exhaust sound is objectively analyzed. There are provided a measuring process (M1) for sampling exhaust sound to be analyzed, by means of a microphone disposed in an exhaust system EX and converting the exhaust sound into an electric signal, an analyzing process (M2) for amplifying a high frequency component of the electric signal and performing a frequency analysis of the electric signal at an arbitrary time interval, a detecting process (M3) for detecting a first formant of the first peak from the low frequency side and a second formant of the second peak from the low frequency side, and a displaying process (M4) for displaying a relationship (brightness and sharpness) between the first formant and second formant in a predetermined time range.
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