IMPLEMENTATION METHOD AND DEVICE OF MULTI-BIT.DELTA.SIGMA. MODULATION-BASED DIGITAL SPEAKER SYSTEM

摘要

The present invention discloses a method and apparatus for implementing a multi-bit ?-? modulation-based digital speaker system. The method comprises: 1) digital format conversion; 2) oversampling interpolation filtering; 3) multi-bit ?-? modulation; 4) thermometer coding; 5) multi-channel mismatch shaping; 6) encoding format conversion; 7) multi-channel digital power amplification; 8) driving a speaker array or a multi-coil speaker unit to sound. The apparatus comprises: a digital input interface, an oversampling interpolation filter, a multi-bit ?-? modulator, a thermometer encoder, a multi-channel mismatch shaper, an encoding format converter, a multi-channel digital power amplifier, and a speaker array or multi-coil speaker unit; The parts are connected in sequential order. The present invention achieves high power output when low-voltage power is supplied, conserves electricity, achieves single-chip integration of a multi-channel playback system, reduces the volume, weight, and cost of implementation of the system, and improves the quality of the reproduced sound.