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----  [求助]L16-256 codec的中文解释  (http://www.nju520.com/bbs/dispbbs.asp?boardid=9&id=17291)
--  作者：luoxiyao
--  发布时间：2009-10-23 15:29:17
--  [求助]L16-256 codec的中文解释

谢谢！
--  作者：admin
--  发布时间：2009-10-24 8:14:39
--  
CODEC
n.
多媒体数字信号编解码器
--  作者：admin
--  发布时间：2009-10-24 8:15:29
--  
通訊協定包括SIP, H323, RTP, Skype等，使用CODEC包括Wideband：L16-256, G.722, G.711, G.722.1, G.722.2，Narrowband包括：G.711, G.726, G.729, G.729a, G.729b, G.729ab, G.729c, G.723.1等。可支援測試標準包括：TIA/EIA-810-A, ANSI/TIA810-B, TIA-920, ETSI等Acoustic標準測試；以及Hearing Aid Compliance(HAC)測試，支援標準包括：FCC Part 68.316, 68.317, ETSI 300 318, TIA-504A等。

Wire Phone Test System可支援PSTN Phone及Mobile Phone音質測試，標準包括TIA/EIA-470-B, TIA-470-C, GSM 11.10等。
--  作者：admin
--  发布时间：2009-10-24 8:17:31
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电话电声测试一块数权威的要是:丹麦"B&K "  接着是:加拿大"MICROTRONIX"

The following are the codes that Microtronix supports
in the IP phone family of products:

Existing Codec Support:

L16 (uncompressed 8KHz)
L16-256 (uncompressed 16KHz) (SIP & RTP only)
G.711 A at 8KHz
G.711 A at 16KHz (SIP & RTP only)
G.711 u at 8KHz
G.711 u at 16KHz (SIP & RTP only)
Standard GSM 6.10 full rate
Microsoft GSM 6.10 full rate
G.729(A) (requires Microtronix license & patent license)

New additions:

L16-256 in H.323
G.722.1 aka \'Siren\' (requires patent license)
G.722.2 aka AMR-WB (requires patent license)
G.723.1 (requires patent license)
G.726
GSM 6.60 aka GSM-EFR (enhanced full rate) (requires same patent license as GSM 6.90)
GSM 6.90 aka GSM-AMR, AMR-NB (requires patent license)
LPC10
Speex

Expanded Codec Support

Many new codec options are now available with the Microtronix IP Test Systems. We have expanded the selection of codecs available with the Test System, added wideband codecs, and now offer a new codec bundle. There are also a number of patented codecs available with appropriate licensing.

--  作者：admin
--  发布时间：2009-10-24 8:32:32
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Codec type Reference Operating rate kbit/s
Linear PCM (16-bit quantization, sampling frequency fs = 16 kHz) L16-256 256

Note: L16-256 added by Roger Britt as this is a mandatory "codec" for test purposes in TIA-920
--  作者：admin
--  发布时间：2009-10-24 8:50:36
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The L16 codec is an uncompressed audio data codec, using 16-bit signed representation with 65535
equally divided steps between minimum and maximum signal level, ranging from -32768 to 32767.
The value is represented in two\'s complement notation and network byte order. This codec is used for
Acoustic Performance verification and possibly for low cost wideband LAN applications. It is
defined in the IETF RFC 1890 in section 4.4.8.