| 摘要 |
An ADPCM method and system comprise dividing a voice signal into a plurality of frames, pre-coding for each of the frames for determining a suitable step size modulation function and maximum step size that will induce better SNR for the frame it is corresponding to, and encoding for each of the frames with its respective suitable step size modulation function and maximum step size. The quality of the processed voice signal is therefore improved and the quantization error thereof is minimized.
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