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The modulator is then programmed to broadcast the signals on a certain frequency. That RF broadcast is then received by the connected TV. When the TV is tuned to the programmed channel, the video and audio signal of the source device is accessed. RF modulation can become difficult in a CATV system. High pass, low pass, and notch filters must be ...
Composite video is received by the circuit board through a short cable terminating in a Molex connector, which plugs into a header on the Apple II motherboard. Input can also be provided through an RCA connector. The output of the RF modulator goes out through a coaxial cable to the antenna switch. [5] [6]
A converter box takes the digital signal from the antenna and outputs composite video (for SD TVs) or HDMI (for HD TVs). A RF/antenna output, if present on a converter box, is usually just a passthrough ("LOOP OUT" which does not provide the box's output signal, but only provides the raw antenna input signal to watch analog channels via a TV ...
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From the late 1970s stand-alone composite monitors came into use, including by the Apple II, [1] VIC-20, Commodore 64, Atari 8-bit computers, IBM PC with CGA card, [2] some IBM PC compatibles, Hewlett-Packard 200 series, [3] and other home and business computers of the 1980s. These computers had composite video outputs, and sometimes composite ...
The process of modulating RF with the original video signal, and then demodulating the original signal again in the TV, introduces losses including added noise or interference. For these reasons, it is best to use composite connections instead of RF connections if possible for live signals and sample the source FM RF signal for recorded formats.
One example of this operation is selecting a channel on a television receiver. With only one RF signal that passes through the electric filter, only the one corresponding video signal is received, with no interference from the other RF signals. [6] For the coded RF signals, a light sensor is utilized. Generally, a light sensor is a device that ...
ATSC and DVB-T specify the modulation used for over-the-air digital television; by comparison, QAM is the modulation method used for cable. The specifications for a cable-ready television, then, might state that it supports 8VSB (for broadcast TV) and QAM (for cable TV). 8VSB is an 8-level vestigial sideband modulation.
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