A 20 dB Audio Noise Reduction System for Consumer Applications

Dolby R. A 20 dB Audio Noise Reduction System for Consumer Applications. In: AES Convention 70. Audio Engineering Society; 1981. Paper 1850. Available from: https://aes.org/publications/elibrary-page/?id=11906

@inproceedings{Dolby1981_11906,
  author = {Dolby, Ray},
  title = {{A 20 dB Audio Noise Reduction System for Consumer Applications}},
  booktitle = {AES Convention 70},
  note = {Paper 1850},
  year = {1981},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=11906}
}

TY  - CPAPER
TI  - A 20 dB Audio Noise Reduction System for Consumer Applications
AU  - Dolby, Ray
T2  - AES Convention 70
M1  - Paper 1850
PY  - 1981
DA  - 1981/10/06
UR  - https://aes.org/publications/elibrary-page/?id=11906
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 compression and expansion ratio. Overshoots, modulation distortion, and noise modulation are well controlled. The demands made on transmission channel uniformity are generally unchanged from these associated with the B-type system. However, 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 10kHz and incorrect channel response at such frequencies. Afurther development reduces the tendency of highly equalized channels to saturate, thereby increasing the useful signal levels which can be handled.
ER  -