This paper describes a digital input Class D amplifier controller integrated circuit which performs many of the functions needed to build a high performance Class D audio amplifier. Sophisticated digital Pulse Width Modulation, combined with digital feed-forward and feedback paths, yields both low cost and high performance amplifier designs. A powerful DSP is included to support amplifier control and allows comprehensive audio signal processing, including loudspeaker load compensation, EQ, time alignment, room acoustics compensation, bass enhancement, loudspeaker driver protection, virtual surround and other audio signal processing tasks. Power supply feed-forward and closed-loop feedback technology correct for power supply variations, non-linearity and other distortion-inducing mechanisms.
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