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• Perceptual_audio_coder abstract "Perceptual Audio Coder (PAC) is an algorithm, like MPEG's MP3 standard, used to compress digital audio by removing extraneous information not perceived by most people. It is used by Sirius Satellite Radio for their DARS service.The PAC originally developed by James Johnston and Anibal Ferreira at AT&T's Bell Labs, has a flexible format and bitrate. It provides efficient compression of high-quality audio over a variety of formats from 16 kbit/s for a monophonic channel to 1024 kbit/s for a 5.1 format with four or six auxiliary audio channels, and provisions for an ancillary (fixed rate) and auxiliary (variable rate) side data channel. For stereo audio signals, it is claimed that it provides near-CD quality at about 56-64 kbit/s, with transparent coding at bit rates approaching 128 kbit/s. In the 1993, ISO-MPEG-2 5-channel test, PAC demonstrated the best decoded audio signal quality available from any algorithm at 320 kbit/s, far outperforming all algorithms, including the layer-II and layer-III backward compatible algorithms.Over the years PAC has evolved considerably. A known software implementation of this codec is CelestialTech's AudioLib. Later, it was considerably improved and renamed to ePAC (enhanced Perceptual Audio Coder) by Lucent, available in the AudioVeda music library manager.iBiquity initially tested PAC for the HD-Radio IBOC digital radio upgrade for FM and AM, but chose an MPEG4-derived codec, HE-AAC, instead. It is interesting to note that MPEG-2 AAC is substantially similar to the original AT&T PAC algorithm written by Johnston and Ferreira, including the specifics of stereo pair coding, bitstream sectioning, handling of 1 or 2 channels at a time, multiple codebooks responding to the same largest absolute value, and block switching triggers. The version of PAC tested for the MPEG-NBC (later to become AAC) trials used 1024/128 sample block lengths, rather than 512/128 sample block lengths.The non-capitalized term is used to describe lossy compression codecs that utilize perceptual coding techniques for audio.".
• Perceptual_audio_coder wikiPageID "7427811".
• Perceptual_audio_coder wikiPageLength "2575".
• Perceptual_audio_coder wikiPageOutDegree "16".
• Perceptual_audio_coder wikiPageRevisionID "653852610".
• Perceptual_audio_coder wikiPageWikiLink Algorithm.
• Perceptual_audio_coder wikiPageWikiLink Amplitude_modulation.
• Perceptual_audio_coder wikiPageWikiLink Category:Audio_codecs.
• Perceptual_audio_coder wikiPageWikiLink Digital_Audio_Radio_Service.
• Perceptual_audio_coder wikiPageWikiLink Digital_audio.
• Perceptual_audio_coder wikiPageWikiLink Digital_radio.
• Perceptual_audio_coder wikiPageWikiLink Frequency_modulation.
• Perceptual_audio_coder wikiPageWikiLink HD-Radio.
• Perceptual_audio_coder wikiPageWikiLink HD_Radio.
• Perceptual_audio_coder wikiPageWikiLink HE-AAC.
• Perceptual_audio_coder wikiPageWikiLink High-Efficiency_Advanced_Audio_Coding.
• Perceptual_audio_coder wikiPageWikiLink IBOC.
• Perceptual_audio_coder wikiPageWikiLink IBiquity.
• Perceptual_audio_coder wikiPageWikiLink In-band_on-channel.
• Perceptual_audio_coder wikiPageWikiLink Lossy_compression.
• Perceptual_audio_coder wikiPageWikiLink MP3.
• Perceptual_audio_coder wikiPageWikiLink MPEG.
• Perceptual_audio_coder wikiPageWikiLink Moving_Picture_Experts_Group.
• Perceptual_audio_coder wikiPageWikiLink Sirius_Satellite_Radio.
• Perceptual_audio_coder wikiPageWikiLink Sound_recording.
• Perceptual_audio_coder wikiPageWikiLink Sound_recording_and_reproduction.
• Perceptual_audio_coder wikiPageWikiLinkText "Perceptual audio coder".
• Perceptual_audio_coder wikiPageWikiLinkText "perceptual coding".
• Perceptual_audio_coder hasPhotoCollection Perceptual_audio_coder.
• Perceptual_audio_coder wikiPageUsesTemplate Template:Citation_needed.
• Perceptual_audio_coder wikiPageUsesTemplate Template:Compu-stub.
• Perceptual_audio_coder wikiPageUsesTemplate Template:Reflist.
• Perceptual_audio_coder subject Category:Audio_codecs.
• Perceptual_audio_coder hypernym Algorithm.
• Perceptual_audio_coder type Article.
• Perceptual_audio_coder type Software.
• Perceptual_audio_coder type Article.
• Perceptual_audio_coder comment "Perceptual Audio Coder (PAC) is an algorithm, like MPEG's MP3 standard, used to compress digital audio by removing extraneous information not perceived by most people. It is used by Sirius Satellite Radio for their DARS service.The PAC originally developed by James Johnston and Anibal Ferreira at AT&T's Bell Labs, has a flexible format and bitrate.".
• Perceptual_audio_coder label "Perceptual audio coder".
• Perceptual_audio_coder sameAs m.02619kg.
• Perceptual_audio_coder sameAs Q7167032.
• Perceptual_audio_coder sameAs Q7167032.
• Perceptual_audio_coder wasDerivedFrom Perceptual_audio_coder?oldid=653852610.
• Perceptual_audio_coder isPrimaryTopicOf Perceptual_audio_coder.