Patent ID: 9300258
Filing Date: 2016-03-29
CPC Classification: H03F,H03M,H04R

Claim Text:
1. A method for driving a digital speaker based on code conversion, successively comprises steps of: (1) converting input signals into pulse code modulated (PCM) signals meeting a requirement of expected parameters; (2) performing multi-bit Σ-Δ modulation to the PCM signals, to push the noise energy within an audio bandwidth out of the audio band; (3) converting low-bit PCM signals having a bit-width of M bit into 1-bit coded signals corresponding to 2 (4) applying dynamic mismatch-shaping to the binary status code vectors of 2 (5) converting pulse density modulation (PDM) coded signals of each channel obtained after multi-bit Σ-Δ modulation and dynamic mismatch-shaping into pulse width modulation (PWM) coded signals; and (6) controlling the on/off status switching of the MOSFET of a full-bridge power amplification network to drive a digital speaker load sound, in such a way that each digital transmission channel controls the on/off action of the full-bridge power amplification circuit by differential PWM signals formed by the converted PWM coded signals and the inverse signals thereof.