- Tutorial on Converting M4A to MP3 with UniConverter for Mac Step 1. Add your M4A songs into the M4A to MP3 Mac APP Downlaod and install the Mac APP, launch it, and to add your original MP3 songs, you can directly drag and drop the source music files to the program or go to the main interface and click 'Add Files'.
- Compatible with Mac, Windows, Android. Cons: The free version can only convert to MP3 format. The interface looks a bit outdated. Audacity is the best free sound editor around. It actually has a pretty decent FLAC converter for Mac users to convert from FLAC files to MP3 format.
So to free up space on your phone or any voice recorder, you need to convert the MP3 file to AMR format. AMR format stands for Adaptive Multi-Rate which is an audio format developed by 3GPP. AMR format is a standard audio format that is used in speech recording or voice recording. Mp3 to amr converter free download. FFmpeg Batch AV Converter Web: FFmpeg Batch AV Converter is a free universal audio and vi.
AMR to MP3 Converter
As its name show, AMR to MP3 Converter is one free audio converter for AMR audio and MP3 audio, it can convert AMR audio to MP3 or convert MP3 audio to AMR. This software can support batch audio conversion; users can convert many files at one time.
Adaptive Multi-Rate (AMR) is used in speech coding and involves audio data compression. Audio data compression allows for more storage on voice files. '.amr' is a popular filename extension for AMR. Many cell phones use AMR for speech recording storage. MP3 is a proprietary format, it is a common audio format for consumer audio storage.
Users can use this program as one ringtone maker, if you like some music, you can use this software to make your style mobile ringtone by yourself.
Convert AMR to MP3
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Convert MP3 to AMR
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Download
The file you download is fully functional and operational, installing and uninstalling process is very easy. This software is completely FREE, it is clean, without any adware or spyware.
- Freeware
- Windows XP, Vista and Windows 7
- Download link:
More about AMR audio
The Extension of AMR File is '.amr', this is compressed audio format developed by Ericsson; used by many 3G cell phones for voice recordings such as MMS messages; incorporates the Algebraic Code Excited Linear Prediction (ACELP) algorithm, which is designed to efficiently compress human speech audio. AMR is especially associated with the Global System for Mobile Communications (GSM). Many software like Apple QuickTime Player, RealNetworks RealPlayer and AMR Player can play AMR audio.
Please note: This file header of common across all AMR-NB files is always set to: 0x23, 0x21, 0x41, 0x4D, 0x52, 0x0A, if the header is not as it should be, the file is probably corrupted and should not be used.
The AMR-WB codec adapts the bit-rate allocation between speech and channel coding, optimising speech quality to prevailing radio channel conditions. While providing superior voice quality over the existing narrowband standards, AMRWB is also very robust against transmission errors due to the multi-rate operation and adaptation. The adaptation is based on similar principles as in the previously standardised 3GPP/ETSI AMR codec (referred to also as the AMR narrow-band codec, AMR-NB).
Declare
The program is a Freeware. It include an Automated FFmpeg 32-bit Windows builds made by Ramiro Polla, the source and win32 static, FFmpeg revision: 26400 and SwScale revision: 32676. FFmpeg is licensed under the GNU Lesser General Public License (LGPL).
© Copyright AMRTOMP3CONVERTER.COM, 2009, All Rights Reserved.What is Adaptive Multi-Rate (AMR)
Adaptive Multi-Rate (AMR) is an audio data compression scheme optimized for speech coding. AMR was adopted as the standard speech codec by 3GPP in October 1998 and is now widely used in GSM and UMTS. It uses link adaptation to select from one of eight different bit rates based on link conditions.
AMR is an audio format which is extensively used in mobile devices in various applications ranging from normal audio player/recorder to VoIP kind of applications. AMR can be further categorized as: AMR-NB( NarrowBand ) and AMR-WB( WideBand ).
AMR-WB ensures that speech quality is optimized in a mobile station by verifying its ability to determine when to request a change to another codec with either more or less error correction and protection as signal quality changes. AMR-NB (Adaptive Multi-Rate Narrowband) is a vocoder employed in low-bitrate applications like mobile phones.
AMR is also a file format for storing spoken audio using the AMR codec. Many modern mobile telephone handsets will allow you to store short recordings in the AMR format, it should be remembered that AMR is a speech format and is unlikely to give ideal results for other audio. The common filename extension is .amr.
Free AMR audio player software - AMR Player
AMR Player is one freeware to let you can play the AMR audio files on your PC, and support to convert common multimedia file formats ( such as MP3 or WAV) to audio AMR/AWB format, or output AMR audio files to MP3/WAV audio format.
Change Amr To Mp3
The usage of AMR Player is very simple, click 'Add Files' button of the main interface, select the one '.amr' file, then click 'Play' button, AMR Player can decode the AMR audio file, then play the audio/music for you. If you want to convert AMR to MP3 format, just select one AMR files that you had added, click 'AMR to MP3', input one MP3 file name, the free program can convert your AMR files at once, both MP3 and WAV are popular audio formats.
Download
The latest version of AMR Player is 1.3 (some small bugs fixed), it is one %100 free software, no adware or no spyware, and you can download here:Main Features about AMR Player
- Simple interface and easy to use;
- Support both AMR-NB and AMR-WB audio formats;
- Convert MP3 to AMR;
- Convert WAV to AMR;
- Convert AMR to MP3;
- Convert AMR to WAV;
- '100% Free', this software is freeware for both personal and commercial use.
Declare
This program use FFmpeg as a standalone command line tool, but not use any source code from FFmpeg project.FFmpeg is licensed under the GNU Lesser General Public License (LGPL) version 2.1 or later, FFmpeg is a trademark of Fabrice Bellard, originator of the FFmpeg project ((fmpeg.org).
The build FFmpeg inclued in this program come from Automated FFmpeg Builds (ffmpeg.arrozcru.org/autobuilds), static builds: source and static w32 (2011-01-17). AMR Player's license is Freeware, is free for both personal and commercial use.