Title :
Application and implementation of an embedded subband coder
Author :
Cox, Richard V. ; Gay, Steven L. ; Gitlin, Richard D. ; Hartung, John
Author_Institution :
AT&T Bell Lab., Holmdel, NJ, USA
Abstract :
An embedded subband speech coder with dynamic bit allocation and postfiltering is described. The coder has been implemented on an AT&T WE DSP32 digital signal processor in real time, and the performance of the coder in a statistical multiplexer environment has been simulated. A technique for eliminating low-rate tandem encodings in a digital network is also described. These techniques are shown to yield improved end-to-end performance in environments with multiple tandem encodings and/or statistical multiplexing.<>
Keywords :
encoding; filtering and prediction theory; line concentrators; multiplexing equipment; signal processing equipment; speech analysis and processing; AT&T WE DSP32 digital signal processor; digital network; dynamic bit allocation; embedded subband speech coder; low-rate tandem encodings; postfiltering; statistical multiplexer; Bandwidth; Bit rate; Filter bank; Finite impulse response filter; Frequency; Low pass filters; Multiplexing; Sampling methods; Speech; Switches;
Conference_Titel :
Communications, 1988. ICC '88. Digital Technology - Spanning the Universe. Conference Record., IEEE International Conference on
Conference_Location :
Philadelphia, PA, USA
DOI :
10.1109/ICC.1988.13541
