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mp3PRO is an unmaintained proprietary audio compression codec that combines the MP3 audio format with the spectral band replication (SBR) compression method. At the time it was developed it could reduce the size of a stereo MP3 by as much as 50% while maintaining the same relative quality. [1]
Monkey's Audio is an algorithm and file format for lossless audio data compression.Lossless data compression does not discard data during the process of encoding, unlike lossy compression methods such as Advanced Audio Coding, MP3, Vorbis, and Opus.
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Frame size (byte) Default packet interval (ms) Description References 0 PCMU audio 1 8000 any 20 ITU-T G.711 PCM μ-Law audio 64 kbit/s RFC 3551 1 reserved (previously FS-1016 CELP) audio 1 8000 reserved, previously FS-1016 CELP audio 4.8 kbit/s RFC 3551, previously RFC 1890 2 reserved (previously G721 or G726-32) audio 1 8000
The acceptable trade-off between loss of audio quality and transmission or storage size depends upon the application. For example, one 640 MB compact disc (CD) holds approximately one hour of uncompressed high fidelity music, less than 2 hours of music compressed losslessly, or 7 hours of music compressed in the MP3 format at a medium bit rate ...
ATRAC was developed for Sony's MiniDisc format. ATRAC was updated with version 2, then version 3, version 4, version 4.5, and Type R and Type S. [2] The first major update was ATRAC3 (not to be confused with version 3 of original ATRAC) in 1999. [3]
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The metadata is stored in a vector of byte strings of arbitrary length and size. The size of the vector and the size of each string in bytes is limited to 2 32 − 1 (about 4.3 billion, or any positive integer that can be expressed in 32 bits). This vector is stored in the second header packet that begins a Vorbis bitstream.