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R. Dolby, "A 20 dB Audio Noise Reduction System for Consumer Applications," Paper 1850, (1981 October.). doi: R. Dolby, "A 20 dB Audio Noise Reduction System for Consumer Applications," Paper 1850, (1981 October.). doi:
Abstract: 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.

@article{dolby1981a,
author={dolby, ray},
journal={journal of the audio engineering society},
title={a 20 db audio noise reduction system for consumer applications},
year={1981},
volume={},
number={},
pages={},
doi={},
month={october},} @article{dolby1981a,
author={dolby, ray},
journal={journal of the audio engineering society},
title={a 20 db audio noise reduction system for consumer applications},
year={1981},
volume={},
number={},
pages={},
doi={},
month={october},
abstract={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.},}

TY - paper
TI - A 20 dB Audio Noise Reduction System for Consumer Applications
SP - EP -
AU - Dolby, Ray
PY - 1981
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - October 1981 TY - paper
TI - A 20 dB Audio Noise Reduction System for Consumer Applications
SP - EP -
AU - Dolby, Ray
PY - 1981
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - October 1981
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.