Instantaneous frequencies of signals obtained by the analytic signal method
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概要
- 論文の詳細を見る
In this paper, the instantaneous frequency is defined as the one obtained by converting a real time signal to a complex analytic signal and by differentiating the time-dependent phase with respect to time. Theoretical expressions of instantaneous frequencies for signals given as combinations of sinusoidal components are presented. Those are compared to the results obtained by numerical methods using the discrete Fourier transform in order to confirm the validity of the expressions and to check accuracies of the numerical methods. A reason for the existence of negative instantaneous frequencies is given by a vector representation of signal components. The instantaneous frequencies of frequency-and amplitude-modulated signals are also discussed. For a periodic sinusoidal burst signal, it was found that the instantaneous frequency stays zero during the period when the signal is zero and takes a value equal to twice that of the sinusoid at the onset of the signal.
- 社団法人日本音響学会の論文
著者
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Suzuki Hideo
Department of Information and Network Science, Chiba Institute of Technology
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Yamazaki Osamu
Department Of Ecological Engineering Toyohashi University Of Technology
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Okawa Shigeki
Department Of Information And Network Science Chiba Institute Of Technology
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Yamazaki Osamu
Department Of Information And Network Science Chiba Institute Of Technology
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Ma Furong
Human Science System, Tokyo Institute of Technology
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Izumi Hideaki
Department of Information and Network Science, Chiba Institute of Technology
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Yamazaki Osamu
Department Of Chemistry Faculty Of Science Chiba University
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Ma Furong
Human Science System Tokyo Institute Of Technology
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Izumi Hideaki
Fac. Of Information And Computer Sci. Chiba Inst. Of Technol.
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Suzuki Hideo
Department Of Cardiology Surugadai Nihon University Hospital
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Suzuki Hideo
Dep. Of Information And Network Sci. Chiba Inst. Of Technol.
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Kido Ken'iti
Professor Emeritus Of Tohoku Univ.
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Suzuki Hideo
Department of Bioscience Research, Tsukuba Research Laboratory, Toagosei Co., Ltd.
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