Perceptual noise masking measure based on synthesis filter...

Details Perceptual noise masking measure based on synthesis filter... Perceptual noise masking measure based on synthesis filter...

G - Physics

10

L

G10L 19/02 (2006.01) G10L 19/06 (2006.01)

Patent

CA 2185746

A speech compression system called "Transform Predictive Coding", or TPC, provides for encoding 7 kHz wideband speech (16 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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