Perceptual coders exploit masking to cut audio storage and bandwidth

Evidence

Masking is exploited practically in digital systems that store and transmit digital audio in order to reduce the amount of information that has to be handled, and therefore reduces the transmission resource, or bandwidth, and memory, hard disk or other storage medium required. Such systems are generally referred to as “perceptual coders” because they exploit knowledge of human perception. For example, perceptual coding is the operating basis of MP3 systems. — David Howard, Jamie Angus, coustics and Psychoacoustics, 1656

Categorization

• DEFINE: Defines perceptual coder — a system that exploits masking knowledge to reduce digital audio information.
• XREF: Connects to lossy compression tradeoffs, like the reader’s interest in how imperceptible detail is discarded. — connects to: Audio compression exploits masking to discard inaudible signal parts — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 2020; Perceptual masking hides large LP distortions that measurements reveal — Toole, Floyd E, Sound reproduction- the acoustics and…, 155; Masking experiments infer auditory representation from masker effects on signals. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 441 (+8 more)
• corroborated: 3 independent passages support this claim — David Howard, Jamie Angus, coustics and Psychoacoustics, 1656

Broader Connections

• Lossy coding exploits psychoacoustic models to make removed information inaudible #expands (0.90) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2581
• Audio compression maximizes information by encoding only unpredictable signal parts #qualifies (0.80)
• Very low bit-rate audio coding requires working in the frequency domain #corroborates (0.75)