Time-Frequency Display Using Cycle-Octave Wavelet Transforms

28. Time-Frequency Display of Electro-Acoustic Data Using Cycle-Octave Wavelet Transforms

AES Convention: 99 Paper Number:4136
Publication Date: 1995-10-06

A cycle-octave time-frequency display is created by plotting the magnitude of the wavelet transform, using a Morlet complex Gaussian wavelet on a log-frequency scale versus time in number of cycles of the wavelet`s center frequency. This type of display is quite well suited to plotting the decay response of wide-band systems, such as the impulse response of a loudspeaker, because the time scale is long at low frequencies and short at high frequencies. If the response of typical filters is plotted on this display, the resultant 3-D responses are independent of the filter`s center frequency, i.e., the decay response shape of a particular filter remains the same as its center frequency is shifted up and down in log frequency.

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Keele, Jr., D. B. (Don); 1995; Time-Frequency Display of Electroacoustic Data Using Cycle-Octave Wavelet Transforms [PDF]; DBK Associates, Elkhart, IN ; Audio Magazine, Hachette Filipacchi Magazines, Inc., New York, NY; Paper 4136; Available from: https://aes2.org/publications/elibrary-page/?id=7630

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