FER音频spec

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【文件名】:06913@52RD_gsmefr.pdf
【格　式】:pdf
【大　小】:23K
【简　介】:
【目　录】:



GSM 06.60
Enhanced Full Rate (EFR) Vocoder.
Algebraic-Code-Excited Linear Predictive (ACELP)
http://www.vocal.com
VOCAL Technologies, Ltd. ETSI GSM 06.60 software libraries include ANSI-C and optimized
assembly code for leading silicon suppliers (ADI, ARM, DSP Group, LSI Logic ZSP, MIPS and TI).
This software is modular and can be executed as a single task under a variety of operating systems
or it can execute standalone with its own kernel.
GSM 06.60 describes the detailed mapping between input blocks of 160 speech samples in 13-bit
uniform PCM format to encoded blocks of 244 bits and from encoded blocks of 244 bits to output
blocks of 160 reconstructed speech samples. The sampling rate is 8,000 sample/s leading to a bit
rate for the encoded bit stream of 12,2 kbit/s. The coding scheme is the so-called Algebraic Code
Excited Linear Prediction Coder (ACELP).
GSM 06.60 also specifies the conversion between A-law PCM and 13-bit uniform PCM. Performance
requirements for the audio input and output parts are included only to the extent that they affect the
transcoder performance. This part also describes the codec down to the bit level, thus enabling the
verification of compliance to the part to a high degree of confidence by use of a set of digital test
sequences.[br]<p align=right><font color=red>+5 RD币</font></p>

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