Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Patent
1991-09-11
1993-04-06
Mottola, Steven
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
330127, 381109, H03F 368
Patent
active
052007081
ABSTRACT:
Apparatus is provided for the virtual expansion of the power providing capacity of a power supply, e.g., for a stereophonic audio system with a given number of channels which may be selectively increased to provide a surround audio system. A plurality of amplifiers, each having an adjustable gain, are powered from the power supply. The current drawn from the power supply is sensed. When additional amplifiers are activated, the total amount of power drawn by all of the amplifiers can exceed a predetermined level which corresponds to the original plurality of amplifiers. However, when it is sensed that the total amount of power drawn exceeds the predetermined level, the gain of all of the amplifiers is reduced so that the power drawn from the power supply does not exceed the predetermined level. Thus, the virtual power providing capacity of the power supply is expanded to power the additional amplifiers.
REFERENCES:
patent: 3681704 (1972-08-01), Davidson
patent: 4439740 (1984-03-01), Warrington
patent: 4490683 (1984-12-01), Rhee
Data Sheets, RCA Solid State, CA3134 Types, File No. 1097, Linear Integrated Circuits, TV Sound IF and Audio Output Subsystems, Feb. 1985.
Linear Integrated Circuits Application Note, RCA Solid State Division, ICAN-6728, Application of the CA3134G Sound IF and Output Subsystem in Television Receivers, by G. M. Harayda, Oct. 1978.
Anderson Mark R.
Morris, Jr. Robert E.
Emanuel Peter M.
Mottola Steven
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
Wein Frederick A.
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