由喇叭振动引起笔记本杂音的客观测试方法及其指标探究

Exploration of Objective Test Method and Index of Notebook Noise Caused by Speaker Vibration

笔记本喇叭工作时其振动有可能传递到笔记本壳体上,易引发一些松动件(键盘,触摸板)的振动,进而产生杂音。长期以来,业内一直以主观评价的方式来对该问题进行评估,耗费大量人力物力。因此,开发一套有效的客观测试方法具有重要的意义。本研究通过分析喇叭的振动特性以及笔记本杂音的声学特征,开发了用于激励笔记本喇叭的通用激励声源以及提取杂音声压能量的方法,进而制定了笔记本杂音的测试方法及测试指标(喇叭杂音度)。并依据该指标选定样本进行用户调研,得到了主观评价与客观测试相吻合的结论,证实了该测试方法及测试指标的有效性。

The vibration of notebook speaker may be transmitted to the notebook shell when it works, causing some loose parts (keyboard, touchpad) to vibrate, and then produce noises. For a long time, the industry has been evaluating the problem by subjective evaluation, which consumes a lot of man-power and material resources. Therefore, it is of great significance to develop an effective and objective test method. This study analyzed the vibration characteristics of the speakers and the acoustic characteristics of the notebook noise, and developed a general sound excitation for the notebook speaker and the method of extracting the noise pressure energy. Then, the test method and test index (SNI: speaker noise index) of the notebook noise caused by the speaker vibration are developed. According to the sample selected by the index, the user survey was carried out, and the conclusion that the subjective evaluation is consistent with the objective test is obtained, so the validity of the test method and test index is confirmed.