With the rapid development of computer and digital image processing technology, video surveillance technology is widely used. Traditional video surveillance systems use a single camera to monitor a fixed scene. Not only does the video have a limited field of view, but it cannot monitor different orientations of the same object. Here, a multi-channel video surveillance system is proposed to monitor different scenarios by stably and reliably switching control of different video channels. The system not only makes up for the limited shortage of traditional surveillance video, but also improves the utilization of monitoring resources and reduces the monitoring cost.
Video capture circuit module
Since the switching time of the video channel is very short, this requires the switching control module to have a very accurate judgment of the video signal in order to send the switching command in time, so it is necessary to select a high-speed converter. In addition, since the system's power supply is 5 V, it is necessary to select a low-power device. Therefore, the AD9203 is selected as a digital quantizing device for analog signals.
The AD9203 is a single-channel, low-voltage, high-speed A/D converter from Analog Devices that has a sampling rate of 40 Ms/s. Its accuracy is stable and reliable, and it always maintains 10-bit accuracy in the full sampling bandwidth. At 40 Ms/s sampling rate, ENOB (effective number of bits) still reaches 9.55 bits, and differential nonlinearity is ±0. .25 LSB, signal-to-noise ratio and distortion are maintained at around 59 dB. The AD9203's flexible operating voltage allows for variations from 2.7 to 3.6 V, making it ideal for high-speed operation of portable devices at low voltages. With a supply of 3 V, the power consumption is only 74 mW at 40 Ms/s full speed; at 5 Ms/s, the power consumption is reduced to 17 mW, and in standby mode, the power consumption is only 0.65 mW. For the peak-to-peak value of the input signal, it is usually set to 1 Vp-p or 2 Vp-p. In addition, the AD9203 allows an external voltage reference, which can flexibly set the peak-to-peak value of the input signal between 1 and 2 V depending on the design requirements.
Figure 2 Circuit application schematic diagram of AD9203
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