Compression Level
MELPe is intended for the compression of speech. Given an 8 kHz audio input, the MELPe codec yields the following compression ratios over a 64 kbit/s μ-Law G.711 datastream, discounting the effects of protocol overhead:
| Bitrate | Compression ratio over G.711 | Payload size | Payload interval |
|---|---|---|---|
| 2400 bit/s | 26.7 X | 54 bits | 22.5 ms |
| 1200 bit/s | 53.3 X | 81 bits | 67.5 ms |
| 600 bit/s | 106.7 X | 54 bits | 90 ms |
As with any low bitrate codec, reaching high levels of compression will involve a trade-off against distortion, and also codec state recovery in the face of packet loss.
Read more about this topic: Mixed-excitation Linear Prediction
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