Pragmatically, the biggest difference between the two is range. IR remote controls require a clear line of sight to the receiving device and their range maxes out at about 30 feet 9. RF remote controls can go through walls and around corners, with a range of roughly feet Most home entertainment components such as stereos, televisions and home entertainment centers use IR remote controls.
When you push a button on a remote control, it transmits a corresponding code to the receiving device by way of LED infrared pulses. The idea is somewhat akin to flashing an SOS signal, but instead of letters, the flashing LED light is transmitting a series of 1s and 0s.
A receiver, built into the component, receives the pulses of light and a processor decodes the flashes into the digital bits required to activate the function. Along with the desired function, remote controls must also piggyback other data. Firstly, they transmit the code for the device they are controlling. This lets the IR receiver in the component know that the IR signals it is picking up are intended for it. It essentially tells the component to start listening. The function data follows, capped by a stop command to tell the IR device go back into passive mode.
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What types of signals do remote controls emit? What is the primary benefit of radio-frequency technology? Wonder What's Next? Explore the following activities with a friend or family member: Need some help visualizing what you learned in this Wonder of the Day?
Ask a friend or family member to watch with you! How many remote controls do you have around the house? Take a walk around and see how many remote controls you can find. You probably have one for your television and movie player. You might also have some for toys and other electronic gadgets. How are the various remotes similar? How are they different? Do you own a universal remote control that operates multiple gadgets? How about remote control apps on a smartphone? What would life be like without remote control?
Find out! Try to go an entire day without using a remote control. Can you figure out how to operate all of your electronic gadgets using just the buttons on the items themselves?
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