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Speex is a lossy format, i.e. quality is permanently degraded to reduce file size. The Speex project was created on February 13, 2002. [ 9 ] The first development versions of Speex were released under LGPL license, but as of version 1.0 beta 1, Speex is released under Xiph's version of the (revised) BSD license. [ 10 ]
The Lyra codec is designed to transmit speech in real-time when bandwidth is severely restricted, such as over slow or unreliable network connections. [1] It runs at fixed bitrates of 3.2, 6, and 9 kbit/s and it is intended to provide better quality than codecs that use traditional waveform-based algorithms at similar bitrates.
G.722.2 (07/03) Non-free QuickTime, RealPlayer: FFmpeg (decoding only), [7] FFmpeg with VisualOn libraries, Android (decoding only) [8] voice recording, audio No No No Yes No G.723.1: ITU-T 1996-03 G.723.1 (05/06) Non-free Various proprietary VoIP software FFmpeg voice recording: No Yes No Yes No G.726: ITU-T 1990-12 Free Various proprietary ...
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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.
A compressor reduces the level of an audio signal if its amplitude exceeds a certain threshold. Threshold is commonly set in decibels (dBFS for digital compressors and dBu for hardware compressors), [8] where a lower threshold (e.g. −60 dB) means a larger portion of the signal is treated. When the signal level is below the threshold, no ...
An audio coding format [1] (or sometimes audio compression format) is a content representation format for storage or transmission of digital audio (such as in digital television, digital radio and in audio and video files). Examples of audio coding formats include MP3, AAC, Vorbis, FLAC, and Opus.
Relative to FLAC, Apple Lossless Audio Codec, or WavPack, Monkey's Audio is slow to encode or decode files. While Monkey's Audio can achieve high compression ratios, [3] the cost is a dramatic increase in requirements on the decoding end. Many older portable media players, and even older smartphones, have difficulty handling this.