描述
勢(shì)通過檢測(cè)電路濾波、放大、整形送給單片機(jī)，單片機(jī)根據(jù)接收的信號(hào)，通過軟件方式反饋給激振電路驅(qū)動(dòng)電磁線圈。通過反饋，弦能在電磁線圈產(chǎn)生的變化磁場(chǎng)驅(qū)動(dòng)下在本振頻率點(diǎn)振動(dòng)。當(dāng)激振信號(hào)撤去后，弦由于慣性作用仍然振動(dòng)。單片機(jī)通過測(cè)量感應(yīng)電動(dòng)勢(shì)脈沖周期，即可測(cè)得弦的振動(dòng)頻率，最后將所測(cè)數(shù)據(jù)顯示出來。測(cè)頻原理框圖如圖2所示。
2.2系統(tǒng)硬件電路設(shè)計(jì)
根據(jù)以上的基本原理和思想，設(shè)計(jì)的測(cè)頻系統(tǒng)的整體電路如圖3所示。主要由激振電路、檢測(cè)電路、單片機(jī)控制電路和顯示電路等幾部分組成。工作過程是由單片機(jī)產(chǎn)生某一頻率的激振信號(hào)，經(jīng)放大后激勵(lì)振弦振動(dòng)，拾振線圈中產(chǎn)生的感應(yīng)電動(dòng)勢(shì)經(jīng)幾級(jí)放大后送給單片機(jī)處理，最后送顯示電路顯示。
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