立体声信号相位差电平差测试仪

Stereo signals tester for phase difference and voltage difference

提出了一种立体声信号相位差电平差测试仪的设计方法。用单片机为控制核心,主要由相位差检测模块、电平差检测模块、频谱分析及处理模块、电源模块、键盘和显示模块组成。将LR立体声信号经频谱分析、整形及占空比检测电路进行处理,采用过零鉴相法,通过测矩形波占空比,实现相位差的测试。将LR信号用AD736专用芯片实现AC/DC转换,通过单片机编程,得到LR电平差。试验数据表明该仪器实现了LR信号相位差电平差的测试,且具有较高的测试精度,并能存储和显示相关信息。本设计具有创新性和实用性,为高质量立体声广播和研发制造高质量音响设备奠定了基础。

A design method about phase difference and voltage difference of stereo signals is presented. The system uses MCU control, mainly by the phase difference detection circuit, voltage difference detection circuit, stereo signals frequency spectrum analysis and processing circuit, power supply circuit, keyboard and LCD ,and so on. After the LR stereo signal spectrum analysis, waveform conversion and duty cycle detecting circuit for processing, method using zero-phase method, by measuring the square wave duty cycle to achieve the test phase difference. LR signal will be converted with the AD736 chip of AC / DC converter, mierocontroller programming through to get LR voltage difference. Test data show that, the tester to achieve a LR signal test of phase difference and voltage difference, and has a high measurement accuracy, and can store and display relevant information. This innovative and practical design for manufacturing high-quality stereo broadcast and quality audio equipment laid the foundation.