One can distinguish remotes after the transmission medium: Wired remote control
- Wire connection with mechanical action (Bowden, Air Pressure Switch,) airplane
- Wire connection with electric effect, for example for missile control (see, for example MILAN), Steering wheel controls for the radio, older remote controls for televisions (cable remote control)
- And ultrasound (about phone beeps for remote answering machines, ultrasonic remote control for TV earlier)
- Radio waves (eg, remote reset of cars, garage door opener, Wireless Switch, Bluetooth with modern entertainment devices)
- Infrared (IR) radiation (mainly electronic appliances such as TVs)
IR remote controls transmit a signal in the invisible infrared range. The radiation source often used infrared LEDs. The signal is output at a frequency of 40 kHz and turned on. As a result, the noise immunity of the receiver increases: A bandpass filter passes only those frequencies and blocks random noise from. By modulating this transmission signal information is transmitted to the receiver.