Patent ID: 7844061

Claim:
A speaker system of utilizing pulse width modulation signals for saving idling power consumption comprising: a first signal source; a first comparator having a positive input terminal coupled to the first signal source; a second signal source coupled to a negative input terminal coupled to the first comparator; a first audio input source; a first switch having a first terminal coupled to the first audio input source; a first mixer having a first input terminal coupled to a second terminal of the first switch; a second comparator having a positive input terminal coupled to the first signal source, and a negative input terminal coupled to an output terminal of the first mixer; a second switch having a first terminal coupled to the second signal source, and a second terminal coupled to a second input terminal of the first mixer; a third switch having a first terminal coupled to the second signal source; a second audio input source; a fourth switch having a first terminal coupled to the second audio input source; a second mixer having a first input terminal coupled to a second terminal of the fourth switch, and a second input terminal coupled to a second terminal of the third switch; a third comparator having a positive input terminal coupled to the first signal source, and a negative input terminal coupled to an output terminal of the second mixer; a first speaker having a first input terminal coupled to an output terminal of the first comparator, and a second input terminal coupled to an output terminal of the second comparator; and a second speaker having a first input terminal coupled to the output terminal of the first comparator, and a second input terminal coupled to an output terminal of the third comparator.