Patent ID: 7889875
Filing Date: 2011-02-15
Classification: H03F

Abstract:
1. A class D amplifier for driving tri-wired stereo amplifier, the class D amplifier comprising of: a first filter, receives a first left audio channel sound signal and a first right audio channel sound signal from a sound generator unit, and associates with an over-sampling frequency to process the first left audio channel sound signal to a second left audio channel sound signal and process the first right audio channel sound signal to a second right audio channel sound signal; a second filter, coupled to the first filter and a two dimensional quantitizer, is used to receive the second left audio channel sound signal and the second right audio channel sound signal from the first filter and to receive a first left audio channel triggering signal and a first right audio channel triggering signal from the two dimensional quantitizer, a frequency weighting function is used to re-configure the second audio channel sound signals and those first triggering signals so as to generate a left audio channel error signal corresponded to the second left audio channel sound signal and the first left audio channel triggering signal and a right audio channel corresponded to the second right audio channel sound signal and the first right audio channel triggering signal; a processor, coupled to the second filter, is used to receive the left audio channel error signal and the right audio channel error signal the error signals are used to calculate a left audio channel optimal signal corresponded to the left audio error signal and a right audio channel optimal signal corresponded to the right audio channel error signal; the two dimensional quantitizer, is coupled to the processor, is used to receive the left audio channel optimal signal and the right audio channel optimal signal; and convert the optimal signals into a second left audio channel triggering signal corresponded to the left audio channel optimal signal and a second right audio channel triggering signal corresponded to the right audio channel optimal signal; the two dimensional quantitizer further transfer the second left audio channel triggering signal and the second right audio channel triggering signal to the second filter so as to replace respectively the first left audio channel triggering signal and the first right audio channel triggering signal; a signal generator, coupled to the two dimensional quantitizer, is used to receive the second left audio channel triggering signal and the second right audio channel triggering signal and generate multiple driving signals according to the second triggering signals; and a logic circuit, comprising of multiple switches, wherein each switch is corresponded to one of the multiple driving signals and the logic circuit is coupled to the signal generator to receive the multiple driving signals and the corresponding switch in the logic circuit is controlled according to the multiple driving signals in order to drive the tri-wired stereo amplifier.