Wavelet Analysis of Bioelectric Signals by Means of Acousto-Optic Processors with Time Integration

Abstract

The possibilities of acousto-optic processors for bioelectric signals wavelet processing have been analyzed. It has been found that the most convenient way to provide this, is the application of the acousto-optic circuits with time integration. The obligatory condition which has to be met in this case is the use of the specific carrier signal for both information signal and mother wavelet, which represents the linear frequency modulated (LFM) signal. It allows to provide the frequency resolving power of the device which is about several or decades Hertz, which is enough for the major bioelectric signals. The mentioned above LFM signal, in its turn, is modulated by the information low-frequency signal, and, in the other channel, by the mother wavelet signal. The mathematical expressions which prove that the output signal of the acousto-optic processor with time integration contains data regarding the information wavelet transform, have been listed. Also, the optical circuit of such processor has been shown and described. The fundamental advantage of the considered method is the possibility to obtain the output processed signal using wavelet processing in the real time mode, i.e., simultaneously with bioelectric signal recording.