文件名称:T-REC-G.711-200911-I!Amd2!SOFT-ZST-E
- 所属分类：
- 语音压缩
- 资源属性：
- [Windows] [Visual.Net] [源码]
- 上传时间：
- 2012-11-26
- 文件大小：
- 894kb
- 下载次数：
- 0次
- 提 供 者：
- c***
- 相关连接：
- 无
- 下载说明：
- 别用迅雷下载，失败请重下，重下不扣分！
介绍说明－－下载内容均来自于网络，请自行研究使用
G.711使用64Kbps的带宽，可将14bits转换成8bits。目前G.711有两个编码方式，A-law以及Mu-law。-G.711 defines two main compression algorithms, the µ -law algorithm (used in North America & Japan) and A-law algorithm (used in Europe and the rest of the world). Both are logarithmic, but A-law was specifically designed to be simpler for a computer to process. The standard also defines a sequence of repeating code values which defines the power level of 0 dB.
The µ -law and A-law algorithms encode 14-bit and 13-bit signed linear PCM samples (respectively) to logarithmic 8-bit samples. Thus, the G.711 encoder will create a 64 kbit/s bitstream for a signal sampled at 8 kHz.[5]
G.711 μ-law tends to give more resolution to higher range signals while G.711 A-law provides more quantization levels at lower signal levels. When using μ-law G.711 in networks where suppression of the all 0 character signal is required, the character signal corresponding to negative input values between decision values numbers 127 and 128 should be 00000010 and the value at the decoder output is-
The µ -law and A-law algorithms encode 14-bit and 13-bit signed linear PCM samples (respectively) to logarithmic 8-bit samples. Thus, the G.711 encoder will create a 64 kbit/s bitstream for a signal sampled at 8 kHz.[5]
G.711 μ-law tends to give more resolution to higher range signals while G.711 A-law provides more quantization levels at lower signal levels. When using μ-law G.711 in networks where suppression of the all 0 character signal is required, the character signal corresponding to negative input values between decision values numbers 127 and 128 should be 00000010 and the value at the decoder output is-
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下载文件列表
Software\G711_Appiii_Fix_v1.00_v1_LC
........\...........................\G711Plus
........\...........................\........\Decoder
........\...........................\........\.......\Decoder.vcproj
........\...........................\........\Encoder
........\...........................\........\.......\Encoder.vcproj
........\...........................\........\G711Plus.ncb
........\...........................\........\G711Plus.sln
........\...........................\........\G711Plus.suo
........\...........................\Makefile
........\...........................\makefile.cl
........\...........................\Readme-G.711-App-v1.00.txt
........\...........................\src
........\...........................\...\basicOp_stl2005_v2.2
........\...........................\...\....................\basop.rme
........\...........................\...\....................\basop32.c
........\...........................\...\....................\basop32.h
........\...........................\...\....................\control.c
........\...........................\...\....................\control.h
........\...........................\...\....................\count.c
........\...........................\...\....................\count.h
........\...........................\...\....................\enh1632.c
........\...........................\...\....................\enh1632.h
........\...........................\...\....................\enh40.c
........\...........................\...\....................\enh40.h
........\...........................\...\....................\Makefile
........\...........................\...\....................\makefile.cl
........\...........................\...\....................\move.h
........\...........................\...\....................\patch.h
........\...........................\...\....................\stl.h
........\...........................\...\....................\typedef.h
........\...........................\...\....................\typedefs.h
........\...........................\...\mainlib
........\...........................\...\.......\app1_postfilter
........\...........................\...\.......\...............\post.c
........\...........................\...\.......\...............\post.h
........\...........................\...\.......\...............\post_anasyn.c
........\...........................\...\.......\...............\post_anasyn.h
........\...........................\...\.......\...............\post_const.h
........\...........................\...\.......\...............\post_gainfct.c
........\...........................\...\.......\...............\post_gainfct.h
........\...........................\...\.......\...............\post_rfft.c
........\...........................\...\.......\...............\post_rfft.h
........\...........................\...\.......\...............\table_post.c
........\...........................\...\.......\g711App
........\...........................\...\.......\.......\g711App.h
........\...........................\...\.......\.......\g711App_common.h
........\...........................\...\.......\.......\g711Appdec.c
........\...........................\...\.......\.......\g711Appenc.c
........\...........................\...\.......\.......\prehpf.c
........\...........................\...\.......\.......\prehpf.h
........\...........................\...\.......\.......\softbit.c
........\...........................\...\.......\.......\softbit.h
........\...........................\...\.......\lower_band
........\...........................\...\.......\..........\autocorr_ns.c
........\...........................\...\.......\..........\fec_lowband.c
........\...........................\...\.......\..........\fec_lowband.h
........\...........................\...\.......\..........\g711.h
........\...........................\...\.......\..........\g711a.c
........\...........................\...\.......\..........\g711mu.c
........\...........................\...\.......\..........\lowband.h
.
........\...........................\G711Plus
........\...........................\........\Decoder
........\...........................\........\.......\Decoder.vcproj
........\...........................\........\Encoder
........\...........................\........\.......\Encoder.vcproj
........\...........................\........\G711Plus.ncb
........\...........................\........\G711Plus.sln
........\...........................\........\G711Plus.suo
........\...........................\Makefile
........\...........................\makefile.cl
........\...........................\Readme-G.711-App-v1.00.txt
........\...........................\src
........\...........................\...\basicOp_stl2005_v2.2
........\...........................\...\....................\basop.rme
........\...........................\...\....................\basop32.c
........\...........................\...\....................\basop32.h
........\...........................\...\....................\control.c
........\...........................\...\....................\control.h
........\...........................\...\....................\count.c
........\...........................\...\....................\count.h
........\...........................\...\....................\enh1632.c
........\...........................\...\....................\enh1632.h
........\...........................\...\....................\enh40.c
........\...........................\...\....................\enh40.h
........\...........................\...\....................\Makefile
........\...........................\...\....................\makefile.cl
........\...........................\...\....................\move.h
........\...........................\...\....................\patch.h
........\...........................\...\....................\stl.h
........\...........................\...\....................\typedef.h
........\...........................\...\....................\typedefs.h
........\...........................\...\mainlib
........\...........................\...\.......\app1_postfilter
........\...........................\...\.......\...............\post.c
........\...........................\...\.......\...............\post.h
........\...........................\...\.......\...............\post_anasyn.c
........\...........................\...\.......\...............\post_anasyn.h
........\...........................\...\.......\...............\post_const.h
........\...........................\...\.......\...............\post_gainfct.c
........\...........................\...\.......\...............\post_gainfct.h
........\...........................\...\.......\...............\post_rfft.c
........\...........................\...\.......\...............\post_rfft.h
........\...........................\...\.......\...............\table_post.c
........\...........................\...\.......\g711App
........\...........................\...\.......\.......\g711App.h
........\...........................\...\.......\.......\g711App_common.h
........\...........................\...\.......\.......\g711Appdec.c
........\...........................\...\.......\.......\g711Appenc.c
........\...........................\...\.......\.......\prehpf.c
........\...........................\...\.......\.......\prehpf.h
........\...........................\...\.......\.......\softbit.c
........\...........................\...\.......\.......\softbit.h
........\...........................\...\.......\lower_band
........\...........................\...\.......\..........\autocorr_ns.c
........\...........................\...\.......\..........\fec_lowband.c
........\...........................\...\.......\..........\fec_lowband.h
........\...........................\...\.......\..........\g711.h
........\...........................\...\.......\..........\g711a.c
........\...........................\...\.......\..........\g711mu.c
........\...........................\...\.......\..........\lowband.h
.