Title :
The delay paradox when combining the outputs of non-quadrature filter networks and its importance to subband coding schemes
Author_Institution :
British Telecom Res. Lab., Ipswich, UK
Abstract :
It is theorized that an apparent paradox can occur when combining the outputs of non-quadrature-filter networks. Under certain conditions, it can be shown that the group delay of the final output signal can be substantially less than the group delay of the constituent signals prior to the combination node. It is noted that this phenomenon is useful in delay-critical applications. It is suggested that it is particularly relevant to subband coding schemes, where it can lead to significant delay savings compared with other realizations. Background theory and practical examples are given to illustrate the effect
Keywords :
filtering and prediction theory; delay paradox; group delay; non-quadrature filter networks; subband coding; Arithmetic; Delay effects; Finite impulse response filter; Frequency; Mirrors; Oral communication; Quantization; Signal design; Signal processing; Telecommunications;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on
Conference_Location :
Glasgow
DOI :
10.1109/ICASSP.1989.266667