Title :
Velocity determination of single sound source based on Doppler effect
Author :
Jin, Wen-biao ; Jun, You
Author_Institution :
Chongqing Univ. of Posts & Telecommun., Chongqing
Abstract :
An algorithm is proposed for determination velocity of single moving sound source with uniform velocity and frequency. A synthesized sound signal is formed to simulating the moving sound source recorded by a fixed recorder, on which Hilbert transform is applied to obtain the instantaneous frequency of the sound signal. Utilize the Doppler effect as a model, which describes the relationship between the velocity and instantaneous frequency, to fit sampled instantaneous frequency by nonlinear least square, the velocity of a mobile can be obtained. Experimental results show that the accuracy of the obtained mobile´s velocity is affected greatly by the background noise. Wavelet and EMD are used to reduce the noise in the noisy sound signal and instantaneous frequency, respectively.
Keywords :
Doppler effect; Hilbert transforms; least squares approximations; signal denoising; signal synthesis; wavelet transforms; Doppler effect; Hilbert transform; empirical mode decomposition; instantaneous frequency; noisy signal; nonlinear least square; single moving sound source; sound signal synthesis; uniform frequency; uniform velocity; velocity determination; wavelet analysis; Acoustic noise; Doppler effect; Extraterrestrial measurements; Fourier transforms; Frequency; Laser radar; Least squares methods; Noise reduction; Velocity measurement; Wavelet transforms; Hilbert transform; empirical mode decomposition (EMD); instantaneous frequency; least square;
Conference_Titel :
Wavelet Analysis and Pattern Recognition, 2007. ICWAPR '07. International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-1065-1
Electronic_ISBN :
978-1-4244-1066-8
DOI :
10.1109/ICWAPR.2007.4420808
