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SILK is an audio compression format and audio codec used by Skype. It is developed by Skype Limited. SILK is a replacement for the SVOPC codec.

The SILK codec was a separate development branch from SVOPC and it has been under development for over 3 years.[1] The stable version of SILK was first introduced in Skype 4.0 Beta 3 for Windows, released on January 7, 2009.[2] The final version of Skype 4.0 was released on February 3, 2009.[3][4] On March 3, 2009 Skype Limited announced that the SILK codec will be available for a royalty free license by third-party software and hardware developers soon.[5] To request the SILK binary SDK, anyone must send an email with some mandatory informations, e.g. name, address, phone, description of how they intend to use SILK, etc.[6]

Skype Limited announced that SILK can use sampling frequency 8, 12, 16 or 24 kHz and bit rate from 6 to 40 kbit/s. It can use low algorithmic delay 25 ms (20 ms frame size + 5 ms look-ahead).[7]

First draft of a SILK Speech Codec description was submitted to IETF on July 6, 2009.[8] There is also a first draft of RTP Payload Format and File Storage Format for SILK Speech and Audio Codec.[9]

See also


  1. ^ Michael Stanford (2009-01-13) Skype’s new super-wideband codec, Retrieved 2009-09-01
  2. ^ Skype Journal (2009-01-07) Skype for Windows 4.0 Beta 3 Hotfix Introduces New Audio Codec, Retrieved 2009-09-01
  3. ^ PCWorld (2009-02-04) Skype Upgrade Simplifies VoIP Video Calls, Retrieved 2009-09-01
  4. ^ (2009-02-04) Skype 4.0 audio: smooth as SILK, Retrieved 2009-09-01
  5. ^ Jonathan Christensen (2009-03-03) SILK, our super wideband audio codec, is now available for free, Retrieved 2009-09-01
  6. ^ Skype SILK – Super Wideband Audio Codec, Retrieved 2009-09-01
  7. ^ Skype SILK Data Sheet, Retrieved 2009-09-01
  8. ^ IETF (2009-07-06) SILK Speech Codec - draft-vos-silk-00.txt, Retrieved 2009-09-01
  9. ^ IETF (2009-07-06) RTP Payload Format and File Storage Format for SILK Speech and Audio Codec, Retrieved 2009-09-01



Simple English

Silk is a natural fiber made by the silk worm larvae. Silk is often used to make cloth. The cloth can be made into clothes, rugs, bedding, or can be used to write or paint on. Silk fibers are very strong. In the past, silk was used to make parachute.

In history, silk came from China and was very expensive.

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