Sound signal amplifier with low power dissipation
AssigneeU.S. Philips Corporation
InventorJoachim Dunnebacke
Life of this patent
Estimating the term…
Abstract
An amplifier for sound signals is made up of an even number of power amplifiers each of which have each an output, wherein each amplifier output can be switched to a first terminal of an associated loudspeaker and in which the second terminals of the loudspeakers can be switched to an output of a buffer amplifier. In order to minimize power losses, the buffer amplifier supplies at its output a DC voltage which is about half the value of the supply voltage of the power amplifiers. In addition, half the power amplifiers supply an output signal that is inverted relative to their input signal.
Claims9
An amplifier for sound signals comprising:
- an even number of power amplifiers each of which has an output, wherein each power amplifier output can be switched to a first terminal of an associated loudspeaker and in which second terminals of the loudspeakers can be switched to an output of a buffer amplifier, wherein the buffer amplifier supplies at its output a DC voltage which is about half the value of a supply voltage of the power amplifiers, and half the number of the power amplifiers supply output signals that are inverted relative to their input signals and other half the number of the power amplifiers supply output signals that are non-inverted relative to their input signals.
An audio amplifier circuit comprising:
- an even number of power amplifiers, each of which has an input which receives an audio input signal and an output coupled to a first terminal of a respective associated loudspeaker,
- a buffer amplifier which supplies at its output a DC voltage which is about half the voltage level of a DC supply voltage for the power amplifiers,
- means coupling respective second terminals of the loudspeakers in common to the output of the buffer amplifier, and wherein
- one half the number of the power amplifiers, each of which supplies to its respective associated loudspeaker an output signal that is inverted relative to its audio input signal;
- and other half the number of the power amplifiers, each of which supplies to its respective associated loudspeaker an output signal that is non-inverted relative to its audio input signal, whereby currents supplied to the output of the buffer amplifier via said loudspeakers substantially compensate one another.
Dependencies are inferred from the claim text.