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2. Second audio program - Wikipedia

   en.wikipedia.org/wiki/Second_audio_program

   On analog television receive-only satellite television systems, audio programs are manually tuned by their subcarrier frequency, commonly around 6 MHz, often as low as 5.8 or as high as 7.2. These travel the same way as the discrete left and right main audio channels, and ATIS station ID , which is heard as Morse code .

3. Audio and video interfaces and connectors - Wikipedia

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

   For analog audio and analog video these functions are all represented in a single signal specification like NTSC or the direct speaker-driving signal of analog audio. Physical characteristics of the electrical or optical equipment include the types and numbers of wires required, voltages, frequencies, optical intensity, and the physical design ...

4. 22.2 surround sound - Wikipedia

   en.wikipedia.org/wiki/22.2_surround_sound

   22.2 or Hamasaki 22.2 (named after Kimio Hamasaki, a senior research engineer at NHK Science & Technology Research Laboratories in Japan) is the surround sound component of Super Hi-Vision (a new television standard with 16 times the pixel resolution (7680×4320) of HDTV (1920x1080).

5. Soundbar - Wikipedia

   en.wikipedia.org/wiki/Soundbar

   Earlier television sets and display units were primarily CRT-based; hence the box was bigger, facilitating larger speakers with good response. But with flat-screen televisions the depth of the screen is reduced dramatically, leaving little room for speakers. As a result, the built-in speakers lack bass response. Soundbars help to bridge this gap.

6. Line level - Wikipedia

   en.wikipedia.org/wiki/Line_level

   Line level is the specified strength of an audio signal used to transmit analog sound between audio components such as CD and DVD players, television sets, audio amplifiers, and mixing consoles. Generally, line level signals sit in the middle of the hierarchy of signal levels in audio engineering.

7. 5.1 surround sound - Wikipedia

   en.wikipedia.org/wiki/5.1_surround_sound

   Each black square depicts a loudspeaker. The center speaker in the top line of the diagram is used for dialogue. The left and right speakers on either side of the center speaker are used to create stereo sound for music and other sound effects in the film. The left and right surround speakers in the bottom line create the surround sound effect.