Title :
An analog wavelet transform chip
Author :
Edwards, R. Timothy ; Godfrey, Michael D.
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., CA, USA
Abstract :
The theory and implementation in subthreshold analog CMOS technology of a circuit which performs continuous wavelet decompositions of a one-dimensional (e.g., audio) input are described. The analog wavelet outputs are the output of a logarithmically scaled bank of bandpass filters; each band is sampled at a rate proportional to the Nyquist rate of the highest frequency content of that band. The result is a matrix of discrete points describing the input signal as a function of both frequency and time. The filter function of each band is Gaussian shaped in order to best resolve the uncertainty relation between time and frequency at each sampled point
Keywords :
CMOS integrated circuits; analogue processing circuits; neural chips; wavelet transforms; Gaussian shaped; Nyquist rate; analog wavelet transform chip; continuous wavelet decompositions; frequency content; logarithmically scaled bank; subthreshold analog CMOS technology; uncertainty relation; Band pass filters; CMOS analog integrated circuits; Continuous wavelet transforms; Discrete wavelet transforms; Filtering; Frequency conversion; Gaussian processes; Time frequency analysis; Uncertainty; Wavelet transforms;
Conference_Titel :
Neural Networks, 1993., IEEE International Conference on
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-0999-5
DOI :
10.1109/ICNN.1993.298736
