Psychoacoustic noise shaping boosts perceived CD signal-to-noise beyond actual bit depth
Evidence
This technique is used to improve the quality of sounds on a CD. An example is Sony Super Bit Mapping (Akune et al., 1992), which uses psychoacoustic noise shaping to give an effective signal-to-noise ratio of 120 dB (20 bits) in our most sensitive frequency range. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2671
Categorization
Category: Factual Claims
- CANDY: A nerdy fun fact: Sony’s Super Bit Mapping achieves a perceived 120 dB (20-bit) SNR on a 16-bit CD by shaping noise away from the ear’s most sensitive band.
- DEFINE: Illustrates what psychoacoustic noise shaping actually achieves, connecting the term to a real product.
Related
- Noise shaping exploits hearing sensitivity to boost effective CD signal quality (similarity 0.94)
- Psychoacoustic noise shaping achieves an effective 120 dB SNR on CD audio (similarity 0.94)
- Sound level has only a weak effect on perceived sharpness (similarity 0.78)
- Digital noise can be shaped to hide where hearing is least sensitive (similarity 0.78)
- Psychoacoustic models govern which audio information can be discarded unnoticed (similarity 0.78)
- Doubling sound level from 30 to 90 dB only doubles perceived sharpness (similarity 0.78)
- Uniform quantization noise requires about 60 dB signal-to-noise to stay masked (similarity 0.78)