TV remote control details of the principle of composition

Update：2018-01-04 21:02:41  Visits：

       TV remote control system basic working principle

       First, the basic composition of remote control color TV

       Color TV in the use of usually have the following aspects of control of pre-selected programs, channel selection, volume, brightness, color, contrast, power, shutdown. For non-remote control TV, people in the ratings, must be through the TV panel buttons, knobs to control the above, to meet the requirements. The remote color TV set can be held by the user's remote control command transmitter (remote control) to the TV remote control operation. At present, almost all of the remote control of color TV uses infrared transmission control signal. Infrared is a kind of invisible light, it is issued by the user's hand holding the remote control. Therefore, the composition of infrared remote control color television sets compared with ordinary color TV, just added a remote control system, the block diagram shown in Figure 3-1-1. Remote control system is usually composed of infrared remote control receiver, infrared remote control transmitter, microprocessor (referred to as CPU), erasable program memory, interface circuit and other parts. According to practical needs, remote control color TV control of the machine control and remote control of two. Local control is by the user presses the button on the panel to issue a command to the microprocessor, and then issued a series of operating commands through the microprocessor, and finally output the control voltage to achieve the color TV control. Remote control is issued by the remote control commands to achieve the color TV control. There are many control buttons on the remote control, each of which represents a control function. When a button is pressed, the encoder in the transmitter outputs a set of control code (binary code) which is modulated at a high frequency of about 450 kHz and amplified to drive the infrared light-emitting diode in the form of infrared light Radiated out, installed on the TV panel of the semiconductor infrared photoelectric conversion diode emitted by the emitter of infrared light radiation basic principle

       After launch, the weak infrared energy is converted to a weak electrical signal. The signal sent to the remote control receiver circuit, the receiving circuit to enlarge, shaping and other input to the system control microprocessor. System control microprocessor based on the input command, read out the corresponding information from memory,C color saturation, contrast, volume control data and the last watch TV station = -t purpose of various data. In order to achieve the microprocessor can be electrically erasable and writeable read and write. Memory read and write operations and data Figure 3-1-5 CPU and EAR0M connection transfer, the memory and the microprocessor must have the following connections.

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