| US 7,523,011 B2 | ||
| Method for analyzing signal waveform and analyzing vehicle dynamic characteristic | ||
| Takao Akiyama, Tokyo (Japan); Masahiko Suzuki, Shizuoka (Japan); Tatsuya Sagiyama, Aichi (Japan); Teruo Yoshida, Shizuoka (Japan); and Yoichi Funahashi, Aichi (Japan) | ||
| Assigned to Meidensha Corporation, Tokyo (Japan); and Toyota Jidosha Kabushiki Kaisha, Aichi (Japan) | ||
| Filed on Sep. 26, 2006, as Appl. No. 11/526,991. | ||
| Claims priority of application No. 2005-279033 (JP), filed on Sep. 27, 2005. | ||
| Prior Publication US 2007/0071327 A1, Mar. 29, 2007 | ||
| Int. Cl. G06K 9/00 (2006.01) | ||
| U.S. Cl. 702—141 [702/66; 702/119; 702/190] | 24 Claims |
| 1. A signal waveform analysis method comprising:
determining a trend component of an object signal by applying a zero-phase filter to the object signal;
determining an oscillatory component of the object signal by removing the trend component from the object signal;
determining a wavelet scalogram by performing a wavelet analysis on the oscillatory component; and
determining an oscillation period of the object signal with which the wavelet scalogram indicates a maximum.
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