raw-audio to AMR Converter

Convert raw-audio to AMR online, for free.



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Auto
Sets how the audio is encoded. "Auto" suits most conversions. "Copy" reuses the audio as-is, so it is fast and keeps full quality, but only when the output format supports it.
100% represents the original volume. To double the volume, increase it to 200%. To reduce volume by half, select 50%
Fades the audio in at the start of the output.
Fades the audio out at the end of the output.
Enable if you want to reverse audio stream
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Specify the end position of trim (HH:MM:SS.MS). Leave at 00:00:00.00 to disable.


How to Convert raw-audio to AMR?

  1. Click the “Choose Files” button to select your raw-audio files.
  2. Click the “Convert to AMR” button to start the conversion.
  3. When the status change to “Done” click the “Download AMR” button

Easy to Use

Simply upload your raw-audio files and click the convert button. You can also batch convert raw-audio to AMR format.

Best Quality

We use both open source and custom software to make sure our conversions are of the highest quality. In most cases, you can fine-tune conversion parameters using “Advanced Settings” (optional, look for the icon).

Free & Secure

Our raw-audio to AMR Converter is free and works on any web browser. We guarantee file security and privacy. Files are protected with 256-bit SSL encryption and automatically deleted after 8 hours.


Raw-audio is a headerless PCM sound file: nothing but the digital samples themselves, with no metadata, no compression, and no marker identifying where the audio begins. A WAV file is essentially the same data with a short descriptive header attached. Raw-audio appears most often as the output of audio hardware, DSP pipelines, and telephony systems, and as the intermediate stage between processing steps.

 

How to open a raw-audio file?

Import it into Audacity using File → Import → Raw Data. You will be asked for the encoding, byte order, channel count, and sample rate, since the file itself does not record them.

 

Common defaults are 16-bit signed PCM at 44,100 Hz or 48,000 Hz; telephony recordings are frequently 8-bit at 8,000 Hz. FFmpeg and SoX can play and convert raw-audio from the command line once you supply the same parameters. Save the result as WAV or MP3 so the settings travel with the file from then on. You can also convert the file with our RAW to MP3 tool.

 

Developed by: No single vendor — a generic PCM stream

Initial Release: N/A


Adaptive Multi-Rate (AMR) is a compressed audio file that is often used for speech coding. The AMR speech codec focuses on narrowband signals, which makes it ideal for voice recordings and radio. It is used regularly in Global System for Mobile Communications (GSM) and Universal Mobile Telecommunications System (UMTS).

 

How to open an AMR file?

Since AMR files are often used on mobile phones, including for MMS messaging, most 3G mobile devices are able to open them. AMR also opens with VLC media player, QuickTime, RealPlayer, and Xine.

 

Other software, such as the free audio-editing software Audacity, can open AMR files. Download audacity easily at SourceForge.net. Because AMR files are heavily compressed and focused on narrowband signals, they are not suitable for music files.

 

Developed by: 3rd Generation Partnership Project (3GPP)

Initial Release: 1999

Useful links:

https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec

https://www.etsi.org/


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