News Release from: Spirit DSP
Edited by the Electronicstalk Editorial Team on 18 November 2002
Cut-down vocoders maintain speech quality
A new pair reduced-bitrate DSP vocoders from Spirit provide high speech quality for bandwidth- and storage-limited applications.
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Spirit has developed new 1000 and 2000bit/s proprietary vocoders based on its 1200 and 2400bit/s vocoder algorithms. Featuring reduced bitrate and good speech quality, these vocoders are best fitted for bitrate-critical applications with limited storage capacity, such as digital answering machines, PDAs, home appliances and more. Both vocoders are based on the classic LPC model, with a mixed multiband excitation (MMBE) model used for excitation signal that ensures correct transmission of all speech signals with tone, noise and mixed spectrum components.
The key factors that make the 1000 and 2000bit/s vocoders ideal for use in bitrate-critical applications with limited storage capacity are low bitrate, high level of speech quality, noise robustness and automatic built-in frame synchronisation of input bit stream.
Both vocoders are compliant with TI's eXpressDSP standard.
Spirit's 1000 and 2000bit/s vocoders are available for licensing in the form of portable ANSI C code.
"In Q1 2003, these vocoder algorithms will be ported to TI's TMS320C54x and TMS320C55x platforms", says Spirit's CEO, Andrew Sviridenko.
"We believe that their high level of speech quality combined with simple application interface will make 1000 and 2000bit/s vocoders the best solution for any parties working with TI C54x and C55x platforms".
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