Product category: Embedded Software and Operating Systems
News Release from: Adaptive Digital Technologies | Subject: GSM-AMR
Edited by the Electronicstalk Editorial Team on 2 May 2003
Adaptive multirate vocoder
runs on TI DSPs
GSM-AMR is an adaptive multirate vocoder that runs running on Texas Instruments TMS320C54x and TMS320C55x digital signal processors
The Adaptive Digital GSM-AMR is an adaptive multirate vocoder that runs running on Texas Instruments TMS320C54x and TMS320C55x digital signal processors. Like all of Adaptive Digital's products, GSM-AMR is efficient and easy to integrate into host applications. GSM-AMR has been standardised for use in 3G mobile telephony.
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It is a complete implementation of the GSM adaptive multirate voice coder.
AMR is a speech coder standard introduced by the 3rd Generation Partnership Project (3GPP), a partnership project of various standards organisations, developed to preserve high speech quality under a wide range of transmission conditions.
The coder supports eight bit rates: 12.2, 10.2, 7.95, 7.40, 6.7, 5.9, 5.15, and 4.75kbit/s, and uses algebraic code excited linear prediction (ACELP) as the compression method.
Further reading
DSP algorithms run on Pentium-based PCs
Adaptive Digital Technologies' DSP algorithms are now available on Pentium-based PCs running either Linux or Windows
A variable-bitrate encoding technique is used to adjust the rate at which to send speech data in accordance with the distance from the basestation, or to reduce radio interference and increase capacity in high-traffic cells.
The coder works on a frame of 160 speech samples (20ms), and as no look ahead is required the algorithmic delay for the coder is 20ms.
This codec includes multirate speech coding, silence compression, comfort noise generation, and error concealment functions.
AMR's silence compression uses voice activity detection (VAD) and discontinuous transmission (DTX) as an added way to save bandwidth by sending fewer bits per second when the user is not speaking.
Although it is specifically designed for 3G cellular services, GSM-AMR can also be used in other applications requiring variable rate speech communication and storage.
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