Dynamic magnetic information storage or retrieval – Head – Core
Patent
1977-07-15
1980-05-06
Konick, Bernard
Dynamic magnetic information storage or retrieval
Head
Core
360 13, G11B 2700, G11B 3100
Patent
active
042018951
ABSTRACT:
An audio signal mixing apparatus requiring no active elements, for a conventional audio amplifier unit having a tape monitor function. Low level signal inputs are level-controlled by potentiometers, mixed, and supplied to the phono input of the conventional amplifier. With the conventional amplifier unit set in the phono and tape monitor modes, the mixed low level signal is preamplified by the input amplifier stage of the amplifier unit and provided to the tape monitor output of the amplifier unit. High level inputs to the mixing apparatus are controlled by respective potentiometers and mixed before being supplied to the high level input of the conventional amplifier unit. A switch in the mixing device allows the preamplified signals from the tape monitor output of the amplifier unit to be combined with the high level inputs and provided to the tape input of the conventional amplifier unit. In this way, the mixing apparatus may be made completely passive without requiring all audio program sources to provide signals of substantially equal level and impedance characteristics.
REFERENCES:
patent: 2110358 (1938-03-01), Dreisbach
patent: 2182192 (1939-12-01), Becker
patent: 2499603 (1950-03-01), Mueller
patent: 2530251 (1950-11-01), Luberoff
patent: 2530252 (1950-11-01), Luberoff
patent: 2995630 (1961-08-01), Kabrick
patent: 3295853 (1967-01-01), Cheng
patent: 3809812 (1974-05-01), Smith
patent: 3914549 (1975-10-01), Bose
patent: 4021614 (1977-05-01), Bubbers
Schematic Diagram-Lafayette, Disc/Mic Mixer, Stock No. 99-46955 W.
Schematic Diagram-Pioneer MA-62.
Audio Cyclopedia, by H. M. Tremaine, .COPYRGT. 1969 by Howard W. Sams & Co., Inc., pp. 405, 406, 414-416.
Faber Alan
Konick Bernard
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