Title :
Frame-adaptive techniques for quality versus efficiency tradeoffs in STFT analysis
Author :
Dorken, Erkan ; Nawab, S. Hamid
Author_Institution :
ECS Dept., Boston Univ., MA, USA
Abstract :
In this paper, we present techniques for computing frame-adaptive approximations to the STFT which can satisfy arbitrarily specified bounds on the number of arithmetic operations per frame. The central idea is to represent the samples in each signal frame with a very small number Q of quantization levels, yielding an SNR of 10Iog(Q2) dB. This leads to the formulation of the frame´s DFT computation as a process of summation among pre-stored vectors. Experimental studies are used to propose and verify mathematical models for how the number of vector additions needed in this process depends on the frequency content of a frame. The models are utilized to design frame-adaptive techniques for excluding various subsets of vector elements from the summation process in order to keep the number of additions per frame from exceeding any specified bound, B
Keywords :
adaptive signal processing; fast Fourier transforms; frequency-domain analysis; time-domain analysis; vector quantisation; DFT computation; SNR; STFT analysis; arithmetic operations; efficiency; frame-adaptive techniques; frequency content; mathematical models; pre-stored vectors; quality; quantization; signal frame; summation process; Arithmetic; Computational efficiency; Contracts; Counting circuits; Laboratories; Military computing; Quantization; Signal resolution; Time frequency analysis;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-1775-0
DOI :
10.1109/ICASSP.1994.389993