High pass, low pass, and notch filters must be used to obstruct certain frequencies, so that the modulator can transmit the signal of the source device on that channel. RF modulation can become complex in a CATV system. When the TV is tuned to the programmed channel, the signal of the source device is accessed. The RF signal is then received by the connected TV. The modulator is then programmed to transmit the signals on a certain channel. Audio/video outputs from source devices such as a DSS receiver, DVD player, VCR, or are coupled to the audio/video inputs on the modulator. These devices have numerous audio and video inputs and one RF output. Multi-channel RF modulators are normally used in any place that requires audio/video distribution like stadiums, homes, hotels, malls, airports etc. RF modulators may also be used to take the audio and video signals from a PAL or NTSC/ATSC composite video, RGB, or other composite AV source, and produce a broadcast RF signal that can be fed into a television's aerial/coaxial connector. There are many RF modulators available, but all function in a similar manner. The RF modulator converts the video (and/or audio) output of a DVD player (or camcorder or video game) into a frequency which can be assigned any channel that is compatible with a TV's cable or antenna input. RF modulators are used to alter signals from devices such as VCRs, DVD players, media players, and game consoles to a format that can be handled by a device designed to receive a modulated RF input, for example, radio and television receivers. A RF modulator is an electronic piece of equipment that provides a baseband signal which is used to transform a radio frequency resource.
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