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PROPERTIES OF RECORDINGS AND AUDIO FILES SAVED IN AMR ...
http://www.forensicscience.pl/pfs/109_Michalek_m.pdf#:~:text=Adaptive%20Multi-Rate%20%28AMR%29%20codec%20was%20standard-ized%20by%20the,of%20mobile%20phones%2C%20but%20also%20by%20other%20popular
Audio/Video Formats - Altova
https://www.altova.com/manual/MobileTogether/mobiletogetherdesigner/mtdobjsfeatures_av_formats.html
• For recording to AMR-NB and AMR-WB audio formats, use only the AMR-NB and AMR-WB codecs, respectively. • The AAC audio format can be recorded with the AAC-Low Complexity, High Efficiency-AAC, and Enhanced Low Delay-AAC codecs, but it is possible that not all of these codecs will be available or work on a given device. iOS
What is AMR? AMR Audio File Format Description
https://www.coolutils.com/Formats/AMR
There are two types of AMR format: NarrowBand (AMR-NB) and WideBand (AMR-WB). Often AMR refers to AMR-NB. Sampling frequency 8 kHz/13-bit (160 samples for 20 ms frames), filtered to 200-3400 Hz. Compared to WAV AMR files are much smaller in size but are of good quality. AMR is well supported by most of modern mobile telephone handsets. AMR files can …
Top 5 Best AMR Recorder Tool Available For all Operating ...
https://www.free-videoconverter.net/screen-recording/amr-recorder/
Amr has two types of format standards the AMR-NB and the AMR-WB. AMR-NB is a narrowband version or known as the basic version. It includes a low bitrate that you may have on MP3 that ranges from 300 to 3400 that are most commonly used for traditional telephones. Examples of its bitrate are:06.70 kbps, 07.40 kbps, 07.95 kbps, 10.20 kbps, 12.20 kbps. While …
AMR File - Remo Software
https://www.remosoftware.com/glossary/amr-file
The frequency range used for AMR-NB is 300-3400 Hz which can produce sound quality equivalent to traditional telephone. This narrowband version uses the bitrates of 04.75 kbps, 05.15 kbps, 05.90 kbps, 06.70 kbps, 07.40 kbps, 07.95 kbps, 10.20 kbps, 12.20 kbps. AMR – WB (Wideband): As the name suggests, this is an enhanced vocoder and uses a wider bandwidth …
AMR-WB, Adaptive Multi-Rate - Wideband Speech Codec
https://www.loc.gov/preservation/digital/formats/fdd/fdd000255.shtml
RFC 4867 (RTP Payload Format and File Storage Format for the Adaptive Multi-Rate [AMR] and Adaptive Multi-Rate Wideband [AMR-WB] Audio Codecs) is available online from IETF at more than one site and in more than one format: RFC 4867 in various formats (https://datatracker.ietf.org/doc/html/rfc4867).
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