Implementation method and device of multi-bit modulation-based digital speaker system

• Main Authors: Ma Dengyong, Yang Jun, Cai Yefeng, Zhou Jianming, Mu Yongsheng, Chai Guoqiang
• Format: Patent
• Language: English
• Published: 10.04.2018
• Subjects: AMPLIFIERS; BASIC ELECTRONIC CIRCUITRY; CALCULATING; CODE CONVERSION IN GENERAL; CODING; COMPUTING; COUNTING; DEAF-AID SETS; DECODING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; PHYSICS; PUBLIC ADDRESS SYSTEMS; STEREOPHONIC SYSTEMS

The present invention discloses an implementation method and a device of a multi-bit Δ-Σ modulation-based digital speaker system. The method comprises, 1) digital format converting; 2) oversampling interpolation filtering; 3) multi-bit Δ-Σ modulating; 4) thermometer coding; 5) multi-channel mismatch shaping; 6) coding format converting; 7) multi-channel digital power-amplifying; 8) driving a speaker array or a multiple voice coil speaker to sound. The device comprises: a digital input interface, an oversampling interpolation filter, a multi-bit Δ-Σ modulator, a thermometer coder, a multi-channel mismatch shaper, a coding format converter, a multi-channel digital power-amplifier, and a speaker array or a multiple voice coil speaker; each portion being connected in proper order. The present invention can achieve a high-power output under a low-voltage power supply, save power consumption, implement a single-chip integration of a multi-channel reproducing system, reduce the volume and weight of the system and the implementing cost, and improve the quality of the reproduced sound.