Compandor apparatus

Wave transmission lines and networks – Amplitude compression and expansion systems

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Details

330 85, 330 86, 330132, 330141, H04B 164

Patent

active

041141156

ABSTRACT:
Compandor apparatus including a compressor comprised of an operational amplifier having a plurality of gain controlling feedback paths that are respectively responsive to different portions of the input frequency spectrum, and an expandor comprised of an operational amplifier having a plurality of gain controlling circuits that are respectively responsive to different portions of the input frequency spectrum.

REFERENCES:
patent: 3769611 (1973-10-01), Scaggs
patent: 3795876 (1974-03-01), Takahashi et al.
patent: 3903485 (1975-09-01), Dolby
patent: 3978409 (1976-08-01), Dolby et al.
patent: 4025723 (1977-05-01), Blackledge

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