DIGITAL SIGNAL PROCESSING APPARATUS FOR PERFORMING WAVELET TRANSFORM

A digital signal processing apparatus comprises a sensor, a multi-valued binary level signal generator, a wavelet transform section, and a post processor. The signal generator receives analog signals output from the sensor and converts them to multi-valued binary level signals. The wavelet transform section has fundamental elements and threshold devices. The fundamental elements are provided at the nodes of a tree structure. Each threshold device is designed to receive at least two multi-valued signals and to output one binary signal, it receives the coefficients of the scaling functions output from the fundamental elements provided at the same level of the tree structure, for extracting the feature of the analog signal. The output signals of the wavelet transform section, i.e., the results of the wavelet transform, are input to the post processor. The apparatus can therefore perform signal processing including wavelet transform, at high speed without using large-scale hardware.