GSM-FR

Full Rate Speech Coder

GSM FR was the first digital speech-coding standard used in GSM digital mobile phone system. 

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Features List

  • Functions are C-callable.
  • Multi -Channel Implementation.
  • Completely re-entrant (Channel can interrupt any Channel, any time)
  • Can be integrated with echo cancellers, VOX and tone detection/regeneration.

Coding Rate: 13.2 kbps
Sampling Rate: 8 kHz

Availability

Platforms
Texas Instruments – TI TMS320C6000 C64x/C64x+/C66x/C674x | TI TMS320C5000 C55x / Legacy C54x

ADT GSM-FR is available on the above Platforms: Other configurations are available upon request.

Specifications

GSM FR C64x / C64x+ / C66x / C674x

All CPU usage given in MIPS (also known as MCPS or MHz).
All Memory usage is given in units of byte.
FunctionC64x MIPSC64x+/C66x/C674x MIPSC64x+/C66x/C674x Program MemoryC64x Program MemoryData MemoryPer-channel DataScratch
Encode2.11.93088026096408688740
Decode3.13.1560640
Encode/Decode5.25.0

GSM FR C55x

All CPU usage given in MIPS (also known as MCPS or MHz).
All Memory usage is given in units of byte.
FunctionMIPSProgram MemoryData MemoryPer-channel DataScratch
Encode8.710293408677740
Decode8.7560640
Encode/Decode17.4

GSM FR C54x

All CPU usage given in MIPS (also known as MCPS or MHz).
All Memory usage is given in units of 16-bit word.
FunctionMIPSC64x Program MemoryData MemoryPer-channel DataScratch
Encode8.75147204344370
Decode8.7280320
Encode/Decode17.4

Description

The Adaptive Digital GSM full rate (GSM FR) vocoder is a real-time implementation of the ETSI GSM 06.10 RPELTP (Regular Pulse Excitation-Long Term-Prediction-Linear Predictive Coder) vocoder. GSM-FR was adopted by the 3GPP for mobile telephony in the early 1990’s.

Adaptive Digital’s GSM-FR is optimized and provides high quality of speech.

Function API's

API function call summary

FR_ADT_encInit (…) Initializes the GSM FR Encode Channel Structure

FR_ADT_decInit (…) Initializes the GSM FR Decode Channel Structure

FR_ADT_encode (…) Executes the GSM FR encoder

FR_ADT_decode (…) Executes the GSM FR decoder

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