智能降噪耳机知识培训

——产品培训2013-12-02深圳市福林电子有限公司深圳市福林电子有限公司◆降噪技术介绍◆耳机工作原理◆降噪耳机检测要点◆制程控制要点培训内容——降噪耳机知识培训降噪耳机的用途：欣赏音乐，防止干扰他人，放松精神，舒展心情，避免城市与环境干扰◆客诉问题回顾深圳市福林电子有限公司一、降噪技术介绍主动降噪：在耳机应用中降噪分主动降噪和被动降噪。——降噪耳机知识培训通过降噪系统产生与外界噪音相反声波，将噪声中和，从而实现降噪的效果。主动降噪耳机带有与外界噪声抗衡的降噪电路。通过耳机结构包围耳朵形成封闭空间或采用硅胶耳塞等隔音材料来阻挡外界噪声来达到降噪效果。由于噪音没有经过降噪电路芯片处理，一般只能阻隔高频噪声，对低频噪声降噪效果不明显。被动降噪：180°深圳市福林电子有限公司——降噪耳机知识培训二、耳机工作原理1.先由安置在耳机内的讯号麦克风侦测耳朵能听到的环境中的低频噪音（50~1000Hz）2.在将噪音信号传至控制电路，控制电路进行实时运算3.在由喇叭发射出于噪声相位相反、振幅相同的声波来抵消噪音4.因此噪音就消失听不见了深圳市福林电子有限公司——降噪耳机知识培训三、降噪耳机检测要点1、NC测试：BlackboxcomputerSPKMIC设备介绍：实物图深圳市福林电子有限公司——降噪耳机知识培训OQC测试流程：三角标识LR1、打开电脑的电源开关和黑色控制盒电源开关，并将USBKey插入电脑上，此时红灯亮。2、电脑进入到WINDOWS桌面后，鼠标左键双击桌面上“signalspace2.0图标。3、点击右上角“file”然后点“open”选择测试程序。7、画面上出现输入序列号对话框，用扫码仪扫入挂牌上的序列号，点击确定进行测试。5、装耳机到测试夹具的L/R位置，不可装反。6、当电脑选择好相应的测试程序后，点击左下角红色三角箭头。4、将耳机插头插入测试冶具母座内，装电池到耳机，耳机开关打到关的位置。8、自动测试后，将耳机电源打开，指灯点亮起。再点击对话框左下角图标，继续测试。9、测试完成后，画面上出现绿色PASSED为良品，出现红色FAILED为不良品。生产线FT测试流程NC测试时间一览表深圳市福林电子有限公司——降噪耳机知识培训曲线规格：BalanceResultsLow(100.0~2,000.0Hz):Mid(100.0~2,000.0Hz):Top(450.0~550.0Hz):(dB)0.60.6-0.9AudioBalanceNCOnFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000-10-8-6-4-20246810AudioQualityFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000708090100110120130峰值SP峰值SRAudio频响曲线Audio平衡曲线NC曲线ResultsPeakN/C(dB):Recovery(dB):Stability(dB):Bandwidth(Hz):Left-18.26.42.8472.2Right-18.77.02.1500.2-18.2dB@205.1Hz6.4dB@644.7Hz-18.7dB@205.1Hz7.0dB@691.6HzDelta:1.07dBHzNCPerformanceFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000-30-25-20-15-10-5051015上限下限中心线深圳市福林电子有限公司——降噪耳机知识培训降噪不良ResultsPeakN/C(dB):Recovery(dB):Stability(dB):Bandwidth(Hz):Left-15.67.41.2381.0Right-15.06.1.9396.3-15.6dB@140.7Hz7.4dB@545.1Hz1.2dB@1,506.2Hz-15.0dB@140.7Hz6.1dB@580.2Hz.9dB@1,506.2HzDelta:0.12dBHzTestingIssue(s):RightANRGainUpNCPerformanceFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000-30-25-20-15-10-5051015ResultsPeakN/C(dB):Recovery(dB):Stability(dB):Bandwidth(Hz):Left-20.16.52.4474.7Right-18.18.42.1450.2-20.1dB@228.6Hz6.5dB@615.4Hz-18.1dB@187.5Hz8.4dB@586.1HzDelta:3.01dBHzTestingIssue(s):LeftANRGainDownNCPerformanceFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000-30-25-20-15-10-5051015ResultsPeakN/C(dB):Recovery(dB):Stability(dB):Bandwidth(Hz):Left-16.8.0.91,506.2Right-17.05.1.7426.6-16.8dB@170.0Hz.0dB@60.0Hz.9dB@3,006.6Hz-17.0dB@152.4Hz5.1dB@597.8Hz.7dB@2,994.9HzDelta:1.40dBHzTestingIssue(s):LeftANRGainDownLeftANRGainDown-HighfrequencycrossovertoohighLeftLowfrequencycrossovertoohighNCPerformanceFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000-30-25-20-15-10-5051015ResultsPeakN/C(dB):Recovery(dB):Stability(dB):Bandwidth(Hz):Left-1.1.3.01,344.2Right-1.2.1.095.7-1.1dB@996.3Hz.3dB@1,412.5Hz-1.2dB@64.5Hz.1dB@99.6HzDelta:0.00dBHzTestingIssue(s):LeftANRPeakFrequencytoohighLeftLowfrequencycrossovertoohighLeftANRGainlowerthan-10.0RightANRGainUpRightANRGainUp-HighfrequencycrossovertoolowRightANRPeakFrequencytoolowRightLowfrequencycrossovertoohighRightANRGainlowerthan-10.0NCPerformanceFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000-30-25-20-15-10-5051015ResultsPeakN/C(dB):Recovery(dB):Stability(dB):Bandwidth(Hz):Left-20.84.52.1429.0Right-20.34.63.5462.7-20.8dB@175.8Hz4.5dB@978.8Hz-20.3dB@222.7Hz4.6dB@838.1HzDelta:2.25dBHzTestingIssue(s):RightLowfrequencycrossovertoohighNCPerformanceFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000-30-25-20-15-10-5051015频宽窄降噪值高降噪值低直线频宽高深圳市福林电子有限公司——降噪耳机知识培训音频不良LeftAudiointersectsUpper/LowerBoundofLowFrequencyRangeLeftAudiointersectsUpper/LowerBoundofMidFrequencyRangeLeftAudiointersectsUpper/LowerBoundofTopFrequencyRangeRightAudiointersectsUpper/LowerBoundofLowFrequencyRangeRightAudiointersectsUpper/LowerBoundofMidFrequencyRangeRightAudiointersectsUpper/LowerBoundofTopFrequencyRangeAudioQualityFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000708090100110120130LeftAudiointersectsUpper/LowerBoundofLowFrequencyRangeLeftAudiointersectsUpper/LowerBoundofMidFrequencyRangeRightAudiointersectsUpper/LowerBoundofLowFrequencyRangeRightAudiointersectsUpper/LowerBoundofMidFrequencyRangeAudioQualityFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000708090100110120130LeftAudiointersectsUpper/LowerBoundofMidFrequencyRangeRightAudiointersectsUpper/LowerBoundofLowFrequencyRangeRightAudiointersectsUpper/LowerBoundofMidFrequencyRangeAudioQualityFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000708090100110120130音频高无音频音频低BalanceResultsLow(200.0~2,000.0Hz):Mid(200.0~2,000.0Hz):Top(200.0~2,000.0Hz):(dB)-13.8-13.8-13.8TestingIssue(s):AudioPeaking13.6dBAudioBalance-13.8dBAudioBalanceNCOnFrequency(Hz)Signal(dB)203040506070809020030040050060070090020003000400050007000900020000-10-8-6-4-20246810音频不