资料介绍
In this paper, we describe the Adaptive Multi-Rate (AMR)
speech coder currently under standardization for GSM systems
as part of the AMR speech service. The coder is a multi-rate
ACELP coder with 8 modes operating at bit-rates from 12.2
kbit/s down to 4.75 kbitls. The coder modes are integrated in a
common structure where the bit-rate scalability is realized
mainly by altering the quantization schemes for the different
parameters. The coder provides seamless switching on 20 ms
frame boundaries. The quality when used on GSM channels is
significantly higher than for existing services.
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