Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1981-06-18
1983-10-04
Pellinen, A. D.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
381 13, H04H 500
Patent
active
044080980
ABSTRACT:
Receiver comprising a field-strength detector for measuring the received signal amplitude and a noise reduction circuit connected thereto via a control signal generating device for reducing audio-frequency noise in the output signal of the receiver, which control signal generating device has an attack and a recovery time constant at a decrease and an increase, respectively, of the received signal amplitude measured by the field strength detector, the recovery time constant being greater than the attack time constant. By adequate control of the cross-talk attenuation of a stereo signal and of the audio band-width, sudden variations in the sound quality at rapid and large field strength variations are prevented. To this end the control must be continuous and must, in the event of field strength variations follow the decrease of the field strength more rapidly than the increase.
REFERENCES:
patent: 3495175 (1970-02-01), Munch
patent: 3821649 (1974-06-01), Grosjean
patent: 3840820 (1974-10-01), Kawada
patent: 4063039 (1977-12-01), Endres et al.
patent: 4107614 (1978-08-01), Sugai
Goodman Edward W.
Oisher Jack
Pellinen A. D.
Streeter William J.
U.S. Philips Corporation
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