SILK

Skype SILK
SILK is an audio compression format and audio codec developed by Skype Limited.wikipedia
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SVOPC

It was developed for use in Skype, as a replacement for the SVOPC codec. SILK replaces the previously used SVOPC in Skype, which was a in-house solution to replace the iSAC and iLBC, which again were licensed from Global IP Solutions.
Starting with Skype 4.0, SVOPC is replaced by SILK.

Opus (audio format)

OpusOpus audio format.opus
It has been extended to the Internet standard Opus codec. SILK is a foundation (with CELT) of the hybrid codec Opus (at the time called "Harmony") that was submitted to the IETF in September 2010, and was chosen as the final candidate for the new standard.
Opus combines the speech-oriented LPC-based SILK algorithm and the lower-latency MDCT-based CELT algorithm, switching between or combining them as needed for maximal efficiency.

CELT

Constrained Energy Lapped Transform
SILK is a foundation (with CELT) of the hybrid codec Opus (at the time called "Harmony") that was submitted to the IETF in September 2010, and was chosen as the final candidate for the new standard.
Development is going on only for its hybridised form as a layer of Opus, integrated with SILK.

Internet Speech Audio Codec

iSAC
SILK replaces the previously used SVOPC in Skype, which was a in-house solution to replace the iSAC and iLBC, which again were licensed from Global IP Solutions.

Data compression

compressionvideo compressioncompressed
SILK is an audio compression format and audio codec developed by Skype Limited.

Audio codec

audio codecscodecaudio
SILK is an audio compression format and audio codec developed by Skype Limited.

Skype Technologies

SkypeSkype LimitedMicrosoft Skype Division
SILK is an audio compression format and audio codec developed by Skype Limited.

Skype

SkypingSkype PreviewJosh Silverman
It was developed for use in Skype, as a replacement for the SVOPC codec.

Sampling (signal processing)

sampling ratesamplingsample rate
Skype Limited announced that SILK can use a sampling frequency of 8, 12, 16 or 24 kHz and a bit rate from 6 to 40 kbit/s.

Bit rate

bitratedata ratedata transfer rate
Skype Limited announced that SILK can use a sampling frequency of 8, 12, 16 or 24 kHz and a bit rate from 6 to 40 kbit/s.

Latency (audio)

latencydelaylow-latency
It can also use a low algorithmic delay of 25 ms (20 ms frame size + 5 ms look-ahead).

Linear predictive coding

LPClinear prediction coefficientsBlock Independent LPC
The codec technology is based on linear predictive coding (LPC).
LPC predictors are used in Shorten, MPEG-4 ALS, FLAC, SILK audio codec, and other lossless audio codecs.

Executable

executable fileexecutable codebinaries
The SILK binary SDK is available.

Open source

open-sourceopensourceopen
The codec is open-source, freeware, available royalty free with restrictions on use and distribution.

Freeware

freefree of chargeRegisterware
The codec is open-source, freeware, available royalty free with restrictions on use and distribution.

Royalty-free

royalty free
The codec is open-source, freeware, available royalty free with restrictions on use and distribution.

Internet Low Bitrate Codec

iLBCGIPS codecInternet Low Bit Rate Codec
SILK replaces the previously used SVOPC in Skype, which was a in-house solution to replace the iSAC and iLBC, which again were licensed from Global IP Solutions.

Global IP Solutions

GIPSGIPS StandardsGlobal IP Sound
SILK replaces the previously used SVOPC in Skype, which was a in-house solution to replace the iSAC and iLBC, which again were licensed from Global IP Solutions.

Consumer Electronics Show

CESInternational CESWinter Consumer Electronics Show
It was announced in January 2009 on the Consumer Electronics Show and was integrated in Skype for the first time in version 4.0 beta 3 from January 7, 2009, with the final version being released on February 3.

Internet Engineering Task Force

IETFInternet Engineering Task Force (IETF)IETF Working Group
The first draft of the SILK Speech Codec description was submitted to the Internet Engineering Task Force (IETF) as a candidate for the standardisation of a new Internet wideband audio codec on July 6, 2009, thereby openly publishing the format along with the source code of the reference implementation.

Real-time Transport Protocol

RTPReal-Time ProtocolRTP / RTCP
There is also a first draft of the RTP Payload Format and File Storage Format for SILK Speech and Audio Codec.