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GSM HR

GSM 06.20 GSM half rate codec uses the VSELP (Vector-Sum Excited Linear Prediction) algorithm. The VSELP algorithm is an analysis-by-synthesis coding technique and belongs to the class of speech coding algorithms known as CELP (Code Excited Linear Prediction).

GSM 06.20 GSM half rate codec's encoding process is performed on a 20 ms speech frame. Based on current and past speech waveform data, the codec encoder derives 18 parameters suitable for bitstream transmission.

 OEM Provider

Cranes Varsity

 

Features

  • eXpress DSP Compliant
  • Functions are C-callable
  • Multichannel capable
  • Encoder and decoder meet all GSM Half Rate compliance and interoperability requirements

Availability

GSM HR is available on the Texas Instruments TMS320 DSP Family C64x and C64x+ platform DSP Generations.

Specifications

Coding Rate: 5.6 kbit/sec

Sampling Rate: 8 kHz

Delay: 20 msec

Resource Usage

 

DSP Generation

Function

Table Memory

Per Channel
Data Memory

Scratch Memory

Peak Loading (MCPS)

C64x+
(Code in ext mem)

Encoder

45.10Kb

2.00Kb

5.65Kb

10.20

Decoder

27.00Kb

1.36Kb

1.28Kb

1.75

C64x+
(Code in int mem)

Encoder

45.10Kb

2.00Kb

5.65Kb

9.39

Decoder

27.00Kb

1.36Kb

1.28Kb

1.72

C64x
(Code in ext mem)

Encoder

105.39kb

2.00kb

5.65kb

20.60

Decoder

31.98kb

1.36kb

1.28kb

3.68

C64x
(Code in int mem)

Encoder

105.39kb

2.00kb

5.65kb

11.30

Decoder

31.98kb

1.36kb

1.28kb

2.13

Notes

1)  For code in ext mem, L 2 cache must be enabled.

2)  Peak MCPS measured on C64x+ cycle accurate simulator and C6416 cycle accurate simulator.

3)  All Memory usage is given in units of byte.