Electronic device
AssigneeYamaha Corporation
InventorHaruo Kajita
Life of this patent
Estimating the term…
Abstract
Provided is an electronic device which can prevent operation stop attributed to lowering of an electronic device operation voltage. A pre-stage of a power amplifier (24) is connected to a capacitor and a first and a second current limit circuit. A CPU (21) monitors a voltage of the capacitor and corrects a gain of the power amplifier (24) in accordance with the voltage value. Moreover, when the electronic device includes a speaker system having a plurality of channels, an audio signal reproduction mode is switched, for example, between a stereo reproduction and a monaural reproduction according to the voltage value of the capacitor.
Claims10
An electronic device comprising:
- a power input unit configured to be supplied with electric power;
- a main drive circuit configured to be driven with electric power supplied from said power input unit;
- and
- a control unit configured to correct a gain of said main drive circuit in accordance with a voltage value of said main drive circuit.
The electronic device according to claim 3, wherein said main drive circuit is a power amplifier, and
- said control unit corrects the gain of the power amplifier in accordance with decrease in voltage value of said electricity storage circuit.
An electronic device comprising:
- a power input unit configured to be supplied with electric power;
- a power amplifier configured to be driven with electric power supplied from said power input unit;
- a plurality of speaker units configured to input an audio signal amplified by said power amplifier and emit sounds;
- and
- a control unit configured to change, in accordance with a voltage value of said power amplifier, a way of supply of the audio signal to said power amplifier and said speaker units.
An electronic device comprising:
- a plurality of power input units configured to be supplied with electric power of different electric currents;
- a plurality of current limiting circuits configured to limit, using different limit values, respective ones of currents input from said plurality of power input units and to output resultant currents;
- a main drive circuit connected to a stage subsequent to said plurality of current limiting circuits;
- an electricity storage circuit connected between said plurality of current limiting circuits and said main drive circuit;
- and
- a control unit configured to switch a form of connection between said plurality of power input units and said plurality of current limiting circuits based on a form of current supply via at least one of said plurality of power input units.
Dependencies are inferred from the claim text.