castinglobi.blogg.se - Scince behind cathode ray tube television

SCINCE BEHIND CATHODE RAY TUBE TELEVISION PROFESSIONAL
SCINCE BEHIND CATHODE RAY TUBE TELEVISION SERIES

The quality of reception varied greatly, dependent in large part on the location and type of receiving antenna. Television signals were originally transmitted exclusively via land-based transmitters. Communication from the studio to the transmitter is accomplished via a dedicated cable or radio system. The facility for housing such equipment, as well as providing space for stages, sets, offices, etc., is called a television studio, and may be located many miles from the transmitter. Practical television systems include equipment for selecting different image sources, mixing images from several sources at once, insertion of pre-recorded video signals, synchronizing signals from many sources, and direct image generation by computer for such purposes as station identification.

An audio amplifier and loudspeaker, which turns electrical signals into sound waves (speech, music, and other sounds) to accompany the images.

A display device, which turns the electrical signals into visual images.

A receiver (also called a tuner), which decodes the picture and sound information from the broadcast signals, and whose input is coupled to the antenna of the television set.

A television antenna to receive the broadcast signals.

A television antenna coupled to the output of the transmitter for broadcasting the encoded signals.

A transmitter, which generates radio signals ( radio waves) and encodes them with picture and sound information.

This is an electrical signal from a microphone or from the audio output of a video tape recorder.

SCINCE BEHIND CATHODE RAY TUBE TELEVISION PROFESSIONAL

This is the electrical signal that represents a visual image, and may be derived from a professional video camera in the case of live television, a video tape recorder for playback of recorded images, or telecine with a flying spot scanner for the transfer of motion pictures to video). The elements of a simple broadcast television system are: Increasingly these are integrated with telephone and Internet services. Many television viewers no longer use an antenna to receive over-the-air broadcasts instead, relying on cable television systems. By the turn of the 21st century, it was technically feasible to replace the analog signals for television broadcasting with digital signals. While mechanically scanned systems were experimentally used, television as a mass medium was made practical by the development of electronic camera tubes and displays.

For the receiving apparatus to reconstruct the image, synchronization information is included in the signal to allow proper placement of each line within the image and to identify when a complete image has been transmitted and a new image is to follow.

By repeating a two-dimensional image quickly enough, the impression of motion can be transmitted as well.

SCINCE BEHIND CATHODE RAY TUBE TELEVISION SERIES

This turns a two-dimensional image into a time series of signals that represent the brightness and color of each resolvable element of the picture. Every television system works on the scanning principle first implemented in the rotating disk scanner of Nipkow.

The technology of television has evolved since its early days using a mechanical system invented by Paul Gottlieb Nipkow in 1884. ( Learn how and when to remove this template message)

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