G.722.1

G.722.1 is a specialized on speech signals transform codec for lossy audio data compression. It is based on the method Siren 7, Polycom, Inc. (then PictureTel Corporation) was developed and patented by the company includes techniques. Use licenses shall be issued free of charge.

The codec operates at a frequency transform with overlapping blocks, the so-called modulated lapped transform ( MLT). It operates at a sampling rate of 16 kHz, and makes frequencies of up to 7 kHz ( "broadband" ) in streams 24 or 32 kbits per second. The computational effort ( algorithmic complexity ) is about 5.5 MIPS ( with floating-point arithmetic ). The algorithmically related transmission delay is 40 milliseconds.

Predecessor of the method was PT716plus. The Department of Telecommunications Standards of the International Telecommunication Union (ITU- T ) the procedure adopted on 30 September 1999 as officially recommended international standard. The Annex, adopted on 14 May 2005 C of the standard describes a wide-band version that can reproduce a frequency range of up to 14 kHz. It represents a purely monophonic version of Siren 14 dar. 2008, the ITU- T approved the development G.719.

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