- Tuner (electronics)
A tuner is a circuit module or free-standing equipment which detects
radio-frequency(RF) signals usually of low amplitudeand amplifies them and converts them to a form suitable for further processing.
radiotuner receives radio broadcasts and converts them into audio-frequencysignals which can be fed into an amplifierdriving a loudspeaker. FMtuner, AM tuner, DAB tuner, etc. are types of radio tuner dealing with transmissions using different methods of modulation. The term "tuner" is used both for part of a radio receiverwhich also contains an amplifier section and for a boxed piece of equipment to be connected to a separate amplifier.
* A television tuner converts an RF television transmission into
audioand videosignals which can be further processed to produce soundand a picture. Different tuners are used for different television standards such as PAL, NTSC, ATSC, SECAM, DVB-C, DVB-T, T-DMB, open cable. For example, as the United States switches off its NTSC analog televisionservices in 2009, ATSC tuners will be used to convert existing analog receivers for over-the-air reception.
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