185*55*40mm Infrared TV Remote Control 43 keys For Set Top Box / Television

Infrared TV Remote Control With Forty-Three Keys Black Case For Set Top Box And Television

As a result of each manufacturer produced a large number of infrared remote control special integrated circuits, when the need to follow the picture can be.Therefore, infrared remote control in household appliances, indoor short distance (less than 10 meters) remote control has been widely used.

The infrared emission part of the multi-channel control system usually has many keys, which represent different control functions.When a key is pressed at the transmitter, there are different output states at the receiver accordingly

The output state of the receiver can be roughly divided into five forms: pulse, level, self-locking, interlocking and data."Pulse" output means that when the transmitter button is pressed, the receiving end will output an "effective pulse" corresponding to the output end, with the width generally around 100ms."Level" output means that when the transmitting end presses the key, the receiving end outputs "effective level" corresponding to the output end, and when the transmitting end looses the key, the transmitting end connects

The receiver "effective level" disappears.The "effective pulse" and "effective level" here may be high or low, depending on the static state of the corresponding output pin. If the static state is low, then "high" is effective.If static is high, then "low" is effective.In most cases, "high" is effective."Self-locking" output means that every time the transmitting end presses a key, the receiving end changes the state corresponding to the output end, that is, the original high level changes to low level, and the original low level changes to high level.This output is suitable for power switch, mute control, etc.This form of output is sometimes called "inverting".An "interlock" output means that multiple outputs clear each other and only one output is valid at the same time.The choice of television station is such a case, other such as dimming, speed, audio input selection