Speech signal quantization using human auditory models in predic

Details Speech signal quantization using human auditory models in predic Speech signal quantization using human auditory models in predic

1995-09-19

1998-01-20

MacDonald, Allen R.

395 226, 395 238, G10L 914

Patent

active

057108633

ABSTRACT:
A speech compression system called "Transform Predictive Coding", or TPC, provides for encoding 7 kHz wideband speech (160 kHz sampling) at a target bit-rate range of 16 to 32 kb/s (1 to 2 bits/sample). The system uses short-term and long-term prediction to remove the redundancy in speech. A prediction residual is transformed and coded in the frequency domain to take advantage of knowledge in human auditory perception. The TPC coder uses only open-loop quantization and therefore has a fairly low complexity. The speech quality of TPC is essentially transparent at 32 kb/s, very good at 24 kb/s, and acceptable at 16 kb/s.

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