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2. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

3. Adaptive Multi-Rate audio codec - Wikipedia

   en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio...

   Open source software to convert the .amr format: RetroCode, Amr2Wav, both are in an early developmental stage; AMR Player is freeware to play AMR audio files, and can convert AMR from/to MP3/WAV audio format. Nokia Multimedia Converter 2.0 can convert (create) samples, one can use Nokia's conversion tool to create both .amr and .awb files. It ...

4. Comparison of audio coding formats - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_audio_coding...

   The 'Music' category is merely a guideline on commercialized uses of a particular format, not a technical assessment of its capabilities. For example, MP3 and AAC dominate the personal audio market in terms of market share, though many other formats are comparably well suited to fill this role from a purely technical standpoint.

5. WAV - Wikipedia

   en.wikipedia.org/wiki/WAV

   The WAV file is an instance of a Resource Interchange File Format (RIFF) defined by IBM and Microsoft. [3] The RIFF format acts as a wrapper for various audio coding formats. Though a WAV file can contain compressed audio, the most common WAV audio format is uncompressed audio in the linear pulse-code modulation (LPCM) format.

6. Pulse-code modulation - Wikipedia

   en.wikipedia.org/wiki/Pulse-code_modulation

   For audio, this type of encoding reduces the number of bits required per sample by about 25% compared to PCM. Adaptive differential pulse-code modulation (ADPCM) is a variant of DPCM that varies the size of the quantization step, to allow further reduction of the required bandwidth for a given signal-to-noise ratio .

7. Full Rate - Wikipedia

   en.wikipedia.org/wiki/Full_Rate

   Full Rate (FR or GSM-FR or GSM 06.10 or sometimes simply GSM) was the first digital speech coding standard used in the GSM digital mobile phone system. It uses linear predictive coding (LPC). The bit rate of the codec is 13 kbit/s, or 1.625 bits/audio sample (often padded out to 33 bytes/20 ms or 13.2 kbit/s).