perceptual audio coding

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A technique for further compressing digital sound by eliminating frequencies that cannot be perceived by the human ear. Frequencies that are too low or too high are eliminated as well as soft sounds that are drowned out by loud sounds. When several musical instruments are playing simultaneously, depending on frequency and volume at any given moment, the sounds from one instrument can cancel out the sounds of another.

Perceptual audio coding uses the psycho-acoustic algorithms developed by Dr. Amar Bose, inventor of the Bose speakers and whose company is known for its quality audio products. MP3 uses perceptual audio coding to dramatically reduce the amount of digital data on a music CD. However, many people find MP3 less pleasing than CD audio, and many others believe even CD audio is less musical than vinyl records. See MP3, audio codec and speech codec.

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No references found			57 He, a highly respected research engineer who has worked for the likes of Panasonic and BrainMedia, delivers this thorough discussion of watermarking technologies and their relationship to copyright protection, digital signal processing, perceptual audio coding and compression and psychoacoustic modeling. Watermarking in audio; key techniques and technologies by SciTech Book News What Will Perceptual Audio Coding Stand for 20 Years from Now? Workshops & Tutorials Drive 127th AES Convention by Business Wire Led by James, "JJ" Johnston, considered a father of perceptual audio coding, DTS will introduce hardware and software solutions and participate in panels and events at the Public Radio Engineering Conference (PREC) on April 17th and the National Association of Broadcasters Show (NAB) in Las Vegas April 20-23rd. DTS Tackles "Loudness" Head-On at PREC & NAB 2009 by Business Wire			percent sign percent voids percentage percentage agreement percentage depletion percentage depth dose percentage differential relay percentage distribution percentage extraction percentage fee percentage humidity percentage log percentage map percentage modulation percentage reinforcement percentage rental percentage ripple percentage subsidence percentage support percentage void percentile percept Perception Perceptional Adaptive Subband Coding Perceptron perceptual audio coding perceptual constancy perceptual overload Perceval Perceval, Spencer Perch Perch Proshian Percha Dam State Park Perche perched aquifer perched block perched boulder perched groundwater perched lake perched rock perched spring perched stream Perched Water perched water table Percheron Percheron horse perching bed Perchlorate Perchloric Acid perchloroethylene perchloromethyl mercaptan			perceptive Perceptive and Intelligent Machines in Complex Environment Perceptive Assistant That Learns perceptive deafness perceptive deafness perceptive deafness perceptively perceptively perceptively perceptiveness perceptiveness perceptiveness perceptivity perceptivity perceptivity Perceptron Perceptron-Based Oblique Trees Perceptrons Percepts Percepts Percepts Percepts perceptual perceptual perceptual perceptual Perceptual Ability Test Perceptual Analysis/Measurement System Perceptual Assimilation Model Perceptual audio coder perceptual audio coding Perceptual Audio Quality Measure Perceptual Audio Sub-Band Coding Perceptual Blocking Distortion Metric Perceptual constancy Perceptual constancy Perceptual constancy Perceptual control theory perceptual defect perceptual defence perceptual deprivation Perceptual Dynamics Perceptual Energy Perceptual Evaluation of Audio Quality Perceptual Evaluation of Speech Quality Perceptual Evaluation of Video Quality perceptual experience Perceptual Interfaces and Reality Laboratory Perceptual Learning Style Preference Perceptual Linear Predictive Perceptual map Perceptual mapping perceptual monotony Perceptual Motor Deficits in Space Perceptual Objective Listening Quality Analysis Perceptual Objective Measurement Perceptual Organization Index

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