TI DSPS 3rd Party Listings: Vocoder Algorithms: G.728 Low-Delay CELP Speech Coder

Digital Signal Processing Solutions Tools: Vocoder Algorithms

Product Name:	G.728 Low-Delay CELP Speech Coder
Company Name:	ASPI Digital
Features & Benefits:	Provides toll-quality speech Callable in TMS320 floating point C
TMS320 Devices Supported:	C3x
Data Rate (kbps):	16
Program Memory (k word):	6060
Data Memory (k word):
Processor Loading (MIPS):
Target Platform:	40 Mhz TMS320C3x
Hardware Requirements:
Technical Support/Training Available:	YES
Overview:	The ITU G.728 standard is a 16 kbps algorithm for coding telephone- bandwidth speech for universal applications using low-delay code excited linear prediction. The G.728 coding algorithm is based on a standard analysis-by-synthesis CELP coding technique. However, several modifications are incorporated to meet the needs of low-delay high-quality speech coding. The G.728 standard was designed to provide speech quality equivalent to or better than that of G.721, even after three tandem connections. THe G.278 coder was also designed to behave well in the presence of multiple speakers and background noise, and to be capable of handling non-speech signals such as DTMF tones and voice-band modem signals at rates of up to 2400bps 9if perceptual weighting and postfiltering are disabled).
Ideal Performance:	G.728 is ideally suited for telecommunications networks in which toll-quality speech is a requirement and total communications link delay is an important factor.
Algorithm Verification:	The ASPI G.728 algorithm has been tested against the ITU Recommendation G.728 test vectors using the ITU G.728 test procedures and is fully compliant in all aspects.
Availability:	Available as object or source code for the TMS320C3x
Operating System Used:
Tools Supported By:
Company Information:	ASPI Digital 1375 Peachtree ST NE STE 690 Atlanta GA 30309-3115 USA Tel: (404) 892-3200 Fax: (404) 892-7265 e-mail: aspi@aspi.com www: http://www.aspi.com
	ASPI Digital supplies the OEM with MPEG Audio Encoders, Acoustic Echo Cancellation products & DSP Platforms needed to integrate high quality algorithms into system-level products.