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Television signals are the electromagnetic waves that transmit television programming from a broadcasting station to a receiver, such as a television set or a digital video recorder. These signals can be transmitted via various methods, including over-the-air broadcasting, cable television, and satellite television.

Over-the-air broadcasting uses terrestrial transmitters to send signals directly to viewers within a certain range. These signals can be received using an antenna, which captures the electromagnetic waves and converts them into a visual and audio signal that can be displayed on a television screen.

Cable television uses coaxial cables to transmit signals from a broadcasting station to a cable headend, where they are distributed to subscribers. This method allows for the transmission of multiple channels and can provide a wider range of programming than over-the-air broadcasting.

Satellite television uses satellites in geostationary orbit to transmit signals to a ground station, which then distributes them to subscribers. This method allows for the transmission of signals over long distances and can provide programming from around the world.

Television signals can be transmitted using analog or digital technology. Analog signals use a continuous waveform to represent the video and audio information, while digital signals use a series of binary digits to represent the same information. Digital signals offer several advantages over analog signals, including improved picture and sound quality, increased channel capacity, and resistance to interference.

Television signals can also be encrypted to prevent unauthorized viewing. This is commonly used by cable and satellite television providers to control access to their programming. Encryption can be implemented using various methods, including conditional access systems and digital rights management.

In summary, television signals are the electromagnetic waves that transmit television programming from a broadcasting station to a receiver. These signals can be transmitted using various methods, including over-the-air broadcasting, cable television, and satellite television. They can be transmitted using analog or digital technology and can be encrypted to prevent unauthorized viewing.