TI DSPS 3rd Party Listings: Vocoder Algorithms: G.722 Audio Coder

Digital Signal Processing Solutions Tools: Vocoder Algorithms

Product Name:	G.722 Audio Coder
Company Name:	ASPI Digital
Features & Benefits:	Code is C callable and relocatable SPOX compatible
TMS320 Devices Supported:	C3x
Data Rate (kbps):	64
Program Memory (k word):	2622
Data Memory (k word):
Processor Loading (MIPS):	10.74
Target Platform:	33 Mhz TMS320C3x
Hardware Requirements:	The input signal to the coder is digitized using a 14-bit or 16-bit A/D sampled at 16 kHz. Output from the encoder is 8 bits at an 8 kHz sample rate for 64 kpbs.
Technical Support/Training Available:	YES
Overview:	G.722 is an ITU audio encoding/decoding standard that provides 7-kHz audio bandwidth at 64 kpbs and has ben fully implementated on a single TI TMS320C3x DSP. The coding system used is sub-band adaptive differential pulse-code modulation (SB-ADPCM). THe input signal to the coder is digitized using a 14-bit or 16-bit A/D sampled at 16 kHz. Output from the encoder is 8 bits at an 8 kHz sample rate for 64 kpbs, which can be stored to disk for later playback. The decoder operates in exactly the opposite fashion. An 8-bit coded input signal is decoded by the SB-ADPCM decoders. THe result is a 16-kHz sampled output. THe overall commpression ratio of the G.722 audio coder is 4 to 1.
Ideal Performance:	G.722 was designed for high-quality speech applications in the telecommunications market.
Algorithm Verification:	Complies with the G.722 standard.
Availability:	Available in both object and source code.
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.