带啸叫检测与抑制20W音频功率放大电路设计  

作　　者：王斌虎 

机构地区：[1]新疆工程学院,新疆乌鲁木齐830023

出　　处：《科学技术创新》2021年第12期157-158,共2页Scientific and Technological Innovation

摘　　要：D类功放体积小,能量转换效率高,可靠性高。与传统的功放不同的是其生产中不需要调试,可大批量生产,能够准确的定位声音信号,同时因其不产生交越失真、过载能力强等优点而被广泛应用。本文以德州仪器(Texas Instruments)提供的TPA3112D1功放芯片,通过功放电路控制、驱动功放的输出喇叭,采用基本模拟运算放大电路,利用NE5532运放芯片组成拾音电路和啸叫抑制电路,采用移相和陷波的滤波方法和数字上升沿设计啸叫检测电路,从而实现啸叫显示电路的设计。设计首先对音频功率放大电路进行概述,分析音频功率放大电路的特点。其次,根据设计要求进行系统方案设计,并完成总体结构设计、硬件设计、软件设计。Class D amplifier is high energy conversion efficiency,small size,and high reliability.Different from traditional amplifier is that its production does not require testing,it can be mass,and can accurately locate the voice signal,because it does not generate crossover distortion,greater overload,it has a broad prospects and been widely used.The design of TI(Texas Instruments)provided TPA3112D1 amplifier chip,controlled by the amplifier circuit,the output speaker of driver amplifier uses basic analog operational amplifier circuit,uses NE5532 composition pickup circuit and the howling suppression circuit,it uses phase shift,notch wave filtering methods and digital design howling detection circuit.The design uses C language to write program,I achieve design of howling display circuit.Firstly,I made a overview of audio power amplifier circuit,analyzing audio power amplifier characteristics and trends.Secondly,according to the design requirements for system design,and I completed the overall structural design,hardware design,software design..

关 键 词：D类功放 运算放大电路 拾音 啸叫 移相和陷波 

分 类 号：TP368.1[自动化与计算机技术—计算机系统结构]