How to convert ac3 to amr

Explicit declaration of ac32amr conversion (ac3toamr)
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AC-3 (backronyms: Audio Codec 3, Advanced Codec 3, Acoustic Coder 3), or Dolby Digital, contains up to 6 discrete sound channels, with 5 channels for normal-range speakers (20 Hz – 20,000 Hz) and 1 channel (20 Hz – 120 Hz) for the subwoofer. The AC3 format supports also variants with the number of channels from 1 to 5.Many Dolby Digital decoders possess downmixing functionality to distribute encoded channels to available speakers. They can play surround information through the front speakers if surround speakers are not available, and distribute the center channel to left and right if no center speaker is available.The AC3 data layout is described in official specifications by a simplified C-like language. An AC3 stream is made up by a series of synchronization frames, which are composed of 6 audio blocks (each of them contains 256 audio samples per channel).

AMR (Adaptive Multi-Rate) is an audio data compression scheme optimized for speech coding. AMR was adopted as the standard speech codec by 3GPP and is now widely used in GSM. It uses link adaptation to select from 1 of 8 different bitrates based on link conditions.
AMR is also a file format for storing spoken audio using the AMR codec. Many modern mobile telephone handsets allow to store short recordings in the AMR format, and some commercial programs convert between this and other formats such as MP3.
In AMR the sampling frequency is 8 kHz/16-bit.

ac32amr. Converting ac3 to amr for Windows, for Mac, for Linux. Migrate ac3 2 amr for Mac, Konvertierung für PC, Konverter für iPod, konvertieren für Palm, for PDA, for PSP, for Zune, for iTunes, for iPhone, for Zen. Command line, batch conversion. Konvertieren ac3 nach amr.