Design Of Digital Audio Power Amplifier Based On The Technology Of1Bit

With the development of electronic technology and digital signal processingtechnology, audio power amplifier has entered a new era, the development ofdigital power amplifier compared with analog power amplifier with highefficiency and good fidelity, power amplifier and speakers as well as good match,but the widely used digital audio amplifier is the PWM (pulse width modulation)power amplifier structure, it is in the process of signal demodulation, willproduce ineviTab. error, at the same time the output of the signal waveform is notsmoth, high noise, and the signal recovery degree is weak.For such problems, this paper adopts DSP as the core design of the digitalaudio power amplifier module, using the interpolation and the output of theexcitation signal modulation algorithm1bit, instead of traditional PWMconversion process. Compared with the original way of PWM digital design, thisscheme can reduce the distortion and noise, also has good design effect in highquality output.Power amplifier design in this paper is mainly used in square, conferenceroom and so on demand for speech signal amplifier and signal effect of thepursuit of more occasions. Based on the relevant technology of digital poweramplifier at present stage and future development trends, demand for subject,using DSP digital power amplifier of1bit excitation signal, and combined withthe corresponding peripheral circuits, completed the design of power supply andprotection module for the system.Combining with the design requirement of system, choose a suiTab. coreprocessor, the67xx series DSP of company called TI, with its advantages indigital signal processing and advanced chip performance can be relatively easy tothe realization of the main function in this design, complete the importantinterpolation and modulation module in the system. And can be done through its abundant peripheral interface of input an output data. During the developmentprocess, using the platform for CCS of TI design the software strcture of DSPsystem, and by observation of CCS and validation algorithm in DSP.This paper introduce in detail the design idea of system platform, completedthe design of each module, and do the simulation algorithm for system, putsforward the concrete method of using DSP to produce excitation signal. Finally,summarizes the process of the project, put forward the need to improve the workand the development direction of the project.