| Publisher | ADT - Adaptive Digital Technologies | ||
|---|---|---|---|
| Format | HTML | Date added | 07 Jan 2001 |
| Topics | Data Compression, Industry Standard Protocols, Voice Recognition | ||
| Downloads | 70 | ||
The ITU G.729 vocoder is used to compress digitized speech data. There are many variations of the G.729 vocoder. This paper discusses the most commonly used variations. These variations are the fixed point implementations that operate at 8000 bits per second. The input (uncompressed) speech is sampled at 8000 samples per second. The samples are assumed to be quantized using 16 bits of resolution. The input bit rate is therefore 8000 * 16 = 128 kbps. The G.729 vocoder operates on 10 millisecond frames. Its compressed bit rate is 8000 bps. The encoder therefore takes in 80 samples of speech data per frame and outputs 80 bits of compressed speech data. The decoder takes in 80 bits of compressed speech data per frame and outputs 80 samples of uncompressed synthesized speech. This paper discusses the original G.729 vocoder as well as its first two Annexes (A and B). The basic vocoder employs an ACELP (Algebraically Excited Linear Prediction) speech coding algorithm. The details of the algorithm are beyond the scope of this paper.
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