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3GP to AMR - Convert audio online
https://www.aconvert.com/audio/3gp-to-amr/
The 3GP and 3G2 file format were designed to decrease storage and bandwidth requirements to accommodate mobile phones. They are good for lower end smartphones for faster streaming & download. AMR speech codec consists of a multi-rate narrowband speech codec that encodes narrowband (200-3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with toll …
3GP to AMR Converter - FreeConvert.com
https://www.freeconvert.com/3gp-to-amr
Auto AMR (Narrowband) AMR (wideband) Copy Choose a codec to encode or compress the audio stream. To use the most common codec, select "Auto" (recommended). To convert without re-encoding audio, choose "Copy" (not recommended). 100% represents the original volume. To double the volume, increase it to 200%.
AMR, Adaptive Multi-Rate Speech Codec
https://www.loc.gov/preservation/digital/formats/fdd/fdd000254.shtml
From the VoiceAge Web site (consulted in April 2007): The proven, highly efficient and very robust AMR (Adaptive Multi-Rate) narrowband codec is the 3GPP mandatory standard codec for narrowband speech and multimedia messaging services over 2.5G/3G wireless systems based on evolved GSM core networks (WCDMA, EDGE, GPRS). . . . AMR operating at various bit …
3GP to AMR (Online & Free) — Convertio
https://convertio.co/3gp-amr/
The AMR audio codec supports various bit rates ranging from 4.75 to 12.2 kbit/s with toll quality speech starting at 7.4 kbit/s. Audio Channels: Mono (1.0) Mono (1.0) Mono (1.0) Set the number of audio channels. This setting is most useful when downmixing channels (e.g., from 5.1 to stereo). Frequency: 8000 Hz.
AMR to 3GP Converter - FreeConvert.com
https://www.freeconvert.com/amr-to-3gp
Click the “Choose Files” button to select your AMR files. Click the “Convert to 3GP” button to start the conversion. When the status change to “Done” click the “Download 3GP” button.
Web audio codec guide - Web media technologies | MDN
https://developer.mozilla.org/en-US/docs/Web/Media/Formats/Audio_codecs
The Adaptive Multi-Rate audio codec is optimized for encoding human speech efficiently. It was standardized in 1999 as part of the 3GPP audio standard used for both GSM and UMTS cellular telephony, and uses a multi-rate narrowband algorithm to encode audio frequencies at a telephony-grade quality level at around 7.4 kbps.
java - How to read raw values of 3gp / AMR-NB audio …
https://stackoverflow.com/questions/14267707/how-to-read-raw-values-of-3gp-amr-nb-audio-format
String mMime = "audio/3gpp"MediaCodec mMediaCodec = MediaCodec.createDecoderByType(mMime); Create Media format and configure media codec. MediaFormat mMediaFormat = new MediaFormat();mMediaFormat = MediaFormat.createAudioFormat(mMime, …
Fixing corrupted 3GP with AMR audio file - VideoHelp Forum
https://forum.videohelp.com/threads/376384-Fixing-corrupted-3GP-with-AMR-audio-file
I have some corrupted audio recordings which use the 3GP container and the AMR codec. I have googled for hours for a tool that can fix them, but none has worked. What does work, however, is the website mp4repair.org. I uploaded one of my corrupted files there and their software does fix it.
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