A 20 dB Audio Noise Reduction System for Consumer Applications

Dolby R. A 20 dB Audio Noise Reduction System for Consumer Applications. J Audio Eng Soc. 1983;31(3):98-113. Available from: https://aes.org/publications/elibrary-page/?id=4594

@article{Dolby1983_4594,
  author = {Dolby, Ray},
  title = {{A 20 dB Audio Noise Reduction System for Consumer Applications}},
  journal = {Journal of the Audio Engineering Society},
  volume = {31},
  number = {3},
  pages = {98--113},
  year = {1983},
  month = mar,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=4594}
}

TY  - JOUR
TI  - A 20 dB Audio Noise Reduction System for Consumer Applications
AU  - Dolby, Ray
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 31
IS  - 3
SP  - 98
EP  - 113
PY  - 1983
DA  - 1983/03/06
UR  - https://aes.org/publications/elibrary-page/?id=4594
PB  - Audio Engineering Society
LA  - en
AB  - A 20 dB noise reduction system, designated C-type, for use in cassette tape recording and similar applications is described. An arrangement of two compressors and two expanders in cascade has been developed in which the signal-to-noise ratio improvement is compounded without significant accompanying increases of the overall maximum maximum compre;ssion and expansion ratio. Overshoots, modulation distortion, and noise modulation are well controlled. The maximum demands made on transmission channel uniformity are generally unchanged from those associated with the B-type system, although the uniformity requirements extend over a greater range of signal frequencies and levels. An improvement has been made in one condition of compressor/expander mistracking, namely, low-level mid-frequency signals in combination with dominant signals in the region above 10 kHz and incorrect channel response at such frequencies. A further development reduces the tendency of highly equalized channels to saturate, thereby increasing the useful signal levels which can be handled.
ER  -