|
PEAQ (Perceptual Evaluation of Audio Quality) 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 (ITU-R). It was originally released as ITU-R Recommendation BS.1387 in 1998 and last updated in 2001. It utilizes software to simulate perceptual properties of the human ear and then, integrate multiple model output variables (MOV) into a single metric. PEAQ characterizes the perceived audio quality as subjects would do in a listening test according to ITU-R BS.1116. PEAQ results principally model mean opinion scores (MOS) that cover a scale from 1 (bad) to 5 (excellent). == Motivation == The need to conserve bandwidth has led to developments in the compression of the audio data to be transmitted. Various encoding methods remove both redundancy and perceptual irrelevancy in the audio signal so that the bit rate required to encode the signal is significantly reduced. They take into account knowledge of human auditory perception and typically achieve a reduced bit rate by ignoring audio information that is not likely to be heard by most listeners. Traditional audio measurements like frequency response based on sinosoidal sweeps, S/N, THD+N do not necessarily corelate well with the audio codec quality. A psychoacoustic model must be used to predict how the information is masked by louder audio content adjacent in time and frequency. Since subjective listening tests are time-consuming, expensive and impractical for everyday use, it was beneficial to substitute listening tests with objective, computer-based methods. Steered by the ITU-R Task Group 6Q, a group of leading sound quality experts developed a new objective model for sound quality: PEAQ. These contributors were: * OPTICOM GmbH, Erlangen, Germany * the Fraunhofer Institute for Integrated Circuits, IIS-A, Erlangen, Germany * Deutsche Telekom Berkom, Berlin, Germany * the University of Berlin, Berlin, Germany * the Institut für Rundfunktechnik, IRT, Munich, Germany * (KPN Research ), Dr. Neher Laboratorium, Leidschendam, The Netherlands * CCETT, France * Communications Research Centre, CRC, Ottawa, Canada 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「PEAQ」の詳細全文を読む スポンサード リンク
|