The ratio of signal level to noise level(SN ratio) is a very important index for VTR and the noise is chiefly from magnetic recording system.
信噪比是评价录像机性能的一个重要指标，而录像机的噪音主要来源于磁记录系统。
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The paper analyzes the pneumatic pump for SN-ratio test by use of the direct-product of internal and external tables , and has determined the optimal parameters.
采用内、外表直积法，对风动水泵进行了SN比试验分析，确定了其最佳参数组合。
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