How to install/uninstall ADX Decoder Directshow Filter :

- To install: decompress the files from "adxdec061.zip" and run the batch file: "reg.bat".
- To uninstall: just run the "unreg.bat" file.

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!"

ACELP.net, 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 ACELP.net 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 ACELP.net has the ability to switch bit rates on the fly to effectively handle network inconsistencies. ACELP.net provides toll-quality compression at 8.5 kbps and near-toll quality at lower rates.

The ACELP.net family has already gained broad recognition, with ACELP.net 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.

For Windows Vista Download From here: 

If you've never installed the decompressor before, simply right-click on the "AC3ACM.inf" file, and choose "Install" from the popup menu. I don't think it's necessary to reboot, but it can't hurt. If you get a scary warning that the program has not passed "Windows Logo testing" (which is quite true BTW), choose to "Continue Anyway."

To uninstall the decompressor, start Control Panel's "Add/Remove Programs" dialog, select "AC-3 ACM Decompressor", and press the "Add/Remove" button.

If you have installed a previous version of the decompressor, I recommend you uninstall the old version as described above, and reboot Windows before installing this version. (It's probably not necessary to do all that, but again, it can't hurt.)

Tags :

- AC-3 ACM Decompressor solves the missing audio codec error, reported by GSpot: ac3 (0x2000) Dolby Laboratories, Inc

Changes in AC-3 ACM Decompressor 1.5 :

- I've ported the code to Visual Studio 2005 and added a new (untested) 64-bit build. Installation instructions are in ReadMe.txt.

• AC-3 ACM Decompressor 1.4

- Fixed an A/V sync problem when encoding 44100 Hz AC-3. 

- If you insert AC3ACM into a DirectShow filter graph as an AC-3 encoder, it chooses a default bitrate based on the number of source channels. The default is (96 * nChannels) kBit/s. I've added an option in the driver configuration dialog which allows you to change the default to (64 * nChannels).