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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.
