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2. Optical sound - Wikipedia

   en.wikipedia.org/wiki/Optical_sound

   A transparent program disc imprinted with concentric optical sound tracks, used for the Optigan musical organ. Optical sound is a means of storing sound recordings on transparent film. Originally developed for military purposes, the technology first saw widespread use in the 1920s as a sound-on-film format for motion pictures.

3. The best TV antennas of 2022: Tested and rated - AOL

   www.aol.com/news/best-tv-antennas-2022-tested...

   The best TV antennas deliver shows, sports, news and movies, with no monthly bills. Here are the best HDTV antennas on the market. The best TV antennas of 2022: Tested and rated

4. Audio and video interfaces and connectors - Wikipedia

   en.wikipedia.org/wiki/Audio_and_video_interfaces...

   Audio only: Analog: Often unmarked on consumer audio equipment since it is so common, or labelled with headphones symbol or as "line out". Computers and other equipment sometimes use Microsoft-Intel color coding scheme, especially when there are multiple input/output plugs. 3.5 mm TRS minijack RCA connector: Balanced audio

5. RCA Photophone - Wikipedia

   en.wikipedia.org/wiki/RCA_Photophone

   RCA Photophone was the trade name given to one of four major competing technologies that emerged in the American film industry in the late 1920s for synchronizing electrically recorded audio to a motion picture image. RCA Photophone was an optical sound, "variable-area" film exposure system, in which the modulated area (width) corresponded to ...

6. Television antenna - Wikipedia

   en.wikipedia.org/wiki/Television_antenna

   A short antenna pole next to a house Multiple Yagi TV aerials. Antennas are commonly placed on rooftops and sometimes in attics. Placing an antenna indoors significantly attenuates the level of the available signal. [19] [20] Directional antennas must be pointed at the transmitter they are receiving; in most cases great accuracy is not needed ...

7. Capacitance Electronic Disc - Wikipedia

   en.wikipedia.org/wiki/Capacitance_Electronic_Disc

   The Capacitance Electronic Disc (CED) is an analog video disc playback system developed by Radio Corporation of America (RCA), in which video and audio could be played back on a TV set using a special stylus and high-density groove system similar to phonograph records.