FIELD: physics.
SUBSTANCE: apparatus has an analogue-to-digital converter (1) whose output is connected to the input of a recirculator (2). The output of the recirculator is connected to the first input of a discrete wavelet transform computer (3). The wavelet transform output is connected to the input of a fast Fourier transform computer (8), the output of which is connected to the first input of a complex multiplier (9), the output of which is connected to the input of an inverse fast Fourier transform computer (11), the output of which is connected to the input of a squared absolute value computer (12), the output of which is connected to the input of a threshold device (13), the output of which is the output of the apparatus; a control device (14), the outputs of which are connected to control inputs of the analogue-to-digital converter (1), the recirculator (2), the discrete wavelet transform computer (3), a multiplier (5), an inverse discrete wavelet transform computer (7), the fast Fourier transform computer (8), the complex multiplier (9), the inverse fast Fourier transform computer (11) and read-only memory (4, 6, 10).
EFFECT: reduced computational and hardware expenses when filtering a signal in a scale-time domain.
15 dwg
