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Perceptual Evaluation of Audio Quality (PEAQ) is a standardized algorithm for objectively measuring perceived audio quality, developed in 1994–1998 by a joint venture of experts within Task Group 6Q of the International Telecommunication Union's Radiocommunication Sector . It was originally released as ITU-R Recommendation BS.1387 in 1998 and ...
The Apple Lossless Audio Codec ( ALAC ), also known as Apple Lossless, or Apple Lossless Encoder ( ALE ), is an audio coding format, and its reference audio codec implementation, developed by Apple Inc. for lossless data compression of digital music. After initially keeping it proprietary from its inception in 2004, in late 2011 Apple made the ...
The Lindos Test Sheet Database is a web-site that encourages users of Lindos test sets to upload their results for others to see. It is becoming a major source of independent results, for popular devices like the iPod as well as professional equipment. Lindos Electronics is currently run by the son of the founder, Chris Skirrow, and in addition ...
Also LCG Jukebox from Lonely Cat Games is able to play FLAC audio on Symbian S60 and Windows Mobile devices. Android operating system devices are capable of playing FLAC since version 3.1 Others may also support it by replacing the device's firmware with the third-party CyanogenMod ROM, which can play back FLAC. Otherwise users could simply opt ...
Audio equipment testing. Audio equipment testing is the measurement of audio quality through objective and/or subjective means. The results of such tests are published in journals, magazines, whitepapers, websites, and in other media. Those who test and evaluate equipment can be roughly divided into two groups: "Objectivists", who believe that ...
An audio analyzer is a test and measurement instrument used to objectively quantify the audio performance of electronic and electro-acoustical devices. Audio quality metrics cover a wide variety of parameters, including level, gain, noise, harmonic and intermodulation distortion, frequency response, relative phase of signals, interchannel crosstalk, and more.
When applied to specific electronic devices, such as loudspeakers, microphones, amplifiers or headphones sound quality usually refers to accuracy, with higher quality devices providing higher accuracy reproduction. When applied to processing steps such as mastering recordings, absolute accuracy may be secondary to artistic or aesthetic concerns.
The test, taking bitrate distribution and RMSD into account, is a tie between mp3PRO, HE-AAC and Ogg Vorbis. Further controlled testing by 3GPP during their revision 6 specification process indicates that HE-AAC and HE-AAC v2 provide "Good" audio quality for music at low bit rates (e.g., 24 kbit/s).
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