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KVM denotes the initials of the keyboard, monitor and mouse of a computer. digital KVM systems are composed of two parts, one is the device terminal and the other is the software adapted to this device terminal. KVM systems are emerging remote centralized management technologies for multiple devices in multiple locations based on IP networks in recent years [1,2]. digital KVM systems mainly use IP networks to control remote computers to control remote computers mainly through IP networks [3]. Therefore, KVM systems are widely used in computer management and remote control of computers. In practical applications, the compression efficiency of images is relatively low and the delay of mouse movements is relatively large. To address these two shortcomings, this paper designs a software based on the RK3399 processor, which on the one hand performs fast image acquisition and high-quality encoding, and on the other hand realizes input control of the target computer through the mouse and keyboard control chip UI012.

This paper introduces a high-precision RC oscillator circuit that is less affected by temperature and supply voltage. The circuit mainly consists of a bandgap reference voltage source, a low-voltage linear regulator, a low-pass filter, and a digital trim circuit, which reduces the circuit's sensitivity to temperature variations and achieves high stability of the oscillator frequency over a wide temperature range. Because of the current digital trimming technique, the circuit's ability to cope with the effects of frequency instability caused by process deviations is further enhanced.The simulation results show that the output center frequency accuracy is maintained within ±0.5% under the supply voltage range of 2.5V~5.5V, temperature range of -40?~125?, and different process corners. The RC oscillator has a high precision output frequency and can be used as a clock signal for a number of highly integrated and high precision applications.