mainly analyses several cases of signal level variation in catv system, and also points out practical methods to be consulted by workers in catv system.
the fluctuation of the signal level is less than 3% during about tow minutes of detection period.
在约两分钟的持续测量中信号电平的起伏不大于3%。
thus as the signal level drops, the higher frequencies are progressively more strongly filtered, which also filters the constant background noise level.
也就是说随着信号等级降低,高频声音越来越多被过滤,静态的背景噪音也被过滤。
the transceiving signal level sometimes disappeared. it can not guarantee correctness of receiving.
收发信号电平有时没有。不能保证準确接受。
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。
the methods to measure fsk signal level and its carrier frequencies are discussed.
分析了提高频率测量精度的措施。
this paper describes a coder using a nonlinear network in which the relationship between the control level of the pulse amplitude modulator and the signal level is approximately linear.
if the input signal level exceeds the programmable threshold, the coarse upper threshold indicator goes high.
如果输入信号电平超过可编程阈值,粗调阈值上限指示器就会变为高电平。
standard signal generator (figure 1 standard signal generator diagram) of the output signal level accurate readings, the increase in the rate of transfer or shift can also read the meter.
considering the detection of low-velocity small target in sea clutter, a novel multiple radar fusion detection method based on the signal level fusion was proposed.