In many portable instruments, the noise and EMI of its switch power supply must be solved, the preferable method is that EMI power is reduced with spread spectrum frequency technique.
在许多便携式设备中，其开关电源的噪声和电磁干扰(emi)是亟待解决的问题，比较好的办法是利用扩频技术来减少EMI信号的功率成分。
When you are in a quiet location and the noise produced during film rewinding is disturbing. Set the main switch selector to L (lock) to turn off the power. Rewinding will be temporarily stopped.
当你在很安静的地方，倒片时产生的噪音会打扰您，可以把主选择开关调到“L”，使电源断开，此时卷片将暂时停止。
The subcircuits consist of the low noise amplifier, RF filter, mixer, driver amplifier, image filter, power amplifier, transmit-receive switch and if filter and so on.
子电路包括低噪声放大器、射频滤波器、混频器、驱动放大器、功率放大器、中频滤波器等。
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