Texas Instruments (TI) cameras: surveillance simulation solutions

software:

The motor control algorithm enables the safety operator to control the movement of the camera through the joystick interface. These mature programs are included in the motor control library of TI TMSF280x Motor Control DSP, designed to help you complete your design quickly. The software also creates a timestamp to display the camera name, date and time. Time stamping the images in the camera can minimize external tampering with operator-level video input. In the audio signal path, the software will screen and modify the sensitivity of the data converter and be responsible for synchronizing audio and video.

Video quality:

In addition to being essentially dependent on the quality of the imager, video effects are also strongly affected by ambient light and temperature levels. Whenever the temperature exceeds the specified temperature by 1 degree, the heat will directly increase the noise by 10 times. When powering the video signal path, TI's TPS7xxx series can provide the required efficiency to avoid severe heat loss, thereby keeping the circuit board cool and minimizing noise.

Consumers are usually willing to pay more for cameras that can work under all lighting conditions. Some monitoring systems add LEDs to their monitoring range, while others embed LEDs around the imager. The number of LEDs required depends on the target distance and the size and type of imager. For color, black and white and infrared imagers, the requirements are different. The best way to determine the number of LEDs required is still to judge the required lighting based on experience. TI's TPS54xx / TPS402xx can efficiently provide conversion to drive LEDs. Most cameras today have CIF (352x240) resolution, and the trend is towards D1 (720x486) and higher resolutions. Mainstream cameras used in gas stations and some retail environments must meet the minimum threshold for video quality (usually CIF).

System audio:

The noise levels at Wangpu and intersections are constantly changing. The MSP430 with integrated data converter is very suitable for processing sound and pre-filtering the signal in order to adjust the sensitivity of the data converter to the noise floor. The OPA36x buffer series and DRV13x / DRV600 audio drivers ensure that signal fidelity is maintained throughout the transmission path.

power supply:

Most monitoring plug-in systems can use 12V or 24V feed voltage. Other power consumption limitations are closely related to the limitations of electronic devices dissipating heat in small camera housings. This is especially important because the CCD imager produces more than 10 times the noise every time the temperature is higher than the specified temperature by 1 degree. Since converters are very efficient and can avoid overheating (compared to LDO), they are particularly suitable for power motors. Because LDOs can provide low-ripple power rails for better signal fidelity, they can be used to power video and audio amplifiers.

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