Codec 3.02

Updated: 10 Nov 2008 Audio Codec is a speech codec for Windows Media Player, developed by VoiceAge - the World's Premier Supplier of Speech and Audio Codecs.
Microsoft clearly recommends using the ACELP codec by VoiceAge.

This is the same codec RealNetworks uses to encode speech. "Indeed, when encoded at just 16 Kbps (one-fourth the size), the ACELP voice codec nearly matches MP3 quality at 64 Kbps!", like prestigious standards such as EFR GSM, IS-136, TETRA, G.723.1, G.729 and G.729 Annex A, is based on ACELP technology.

This state-of-the-art technology has now been adapted to meet the needs of IP networks and the PC platform by using an improved, net-adapted packetization method that outperforms conventional approaches.

In particular, it minimizes the impact of errors while significantly improving error correction possibilities in case of data-packet losses. Through frame concatenation and interlacing, the communication channel is made more robust.

The family includes a dual-rate codec (8.5/6.5 kbps), a fixed-rate codec (5.0 kbps) and a wideband codec (16 kbps). The dual-rate version of has the ability to switch bit rates on the fly to effectively handle network inconsistencies. provides toll-quality compression at 8.5 kbps and near-toll quality at lower rates.

The family has already gained broad recognition, with being the preferred low bit rate speech codec in RealAudio® and being included in both Microsoft MediaPlayer and Audible ready equipment. This technology can be rapidly harnessed for applications such as broadcast over Internet (multicasting), multimedia email and multimedia conferencing.

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- Audio Codec Tag 130 may be requested when Codec is missing.

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Speex: is an Open Source/Free Software patent-free audio compression format designed for speech.

Speex Voice ACM Codec: the Speex ACM wrapper allows you to use Speex voice compression codec in WAVE and AVI files on any 32 bit Windows operating system!

5 Codec 3.02
on 20 June 2011, reviewed by: rsingh

I was no able to play asf files on WMP11 on my vista machine and finally Codec solved ...

5 Codec 3.02
on 15 March 2010, reviewed by: Masoud

Thanks for this codec. It solved my .wav problem in windows 7

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