2023年7月14日 · An AMR file is an audio file saved in a compressed format developed by Ericsson. It is optimized for storing spoken audio and is used by many 3G cell phones to store voice recordings, which include MMS messages.

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2023年6月19日 · An AMR file is an Adaptive Multi-Rate ACELP Codec file used for encoding audio files. Here's how to open or convert AMR files.

The Adaptive Multi-Rate (AMR, AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding. AMR is 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 quality [3] speech starting at 7.4 kbit/s. [4]

2023年12月22日 · Files with the .amr extension are compressed audio files that have been optimized to record speech. The AMR file format was created for cell phone voice recordings. When a user creates a voice message or voice memo with certain cellular phones, the files are created with the .amr file extension.

2024年3月11日 · AMR is the abbreviation of Adaptive Multi-rate Audio Codec. It is an audio compression format optimized for speech coding. In addition, the AMR file format can also be used to store spoken audio using the same codec. AMR was adopted as the standard speech codec by 3GPP in 1999 and is now widely used in GSM and UMTS.