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  2. Audio tape specifications - Wikipedia

    en.wikipedia.org/wiki/Audio_tape_specifications

    As well as 1 ⁄ 4 in (6.4 mm) tape, studio and multitrack machines use tape widths of 1 ⁄ 2, 1, and 2 inches (12.7, 25.4, and 50.8 mm), and at least one 3 inches (76.2 mm) [citation needed] machine was available for a time. There is also a 35 mm width, but this variety is more similar to the motion picture stock of the same width. It is ...

  3. Reel-to-reel audio tape recording - Wikipedia

    en.wikipedia.org/wiki/Reel-to-reel_audio_tape...

    Reel-to-reel preceded the development of the compact cassette with tape 0.15 inches (3.8 mm) wide moving at 1 + 7 ⁄ 8 inches per second (4.8 cm/s). By writing the same audio signal across more tape, reel-to-reel systems give much greater fidelity at the cost of much larger tapes.

  4. Compact Disc subcode - Wikipedia

    en.wikipedia.org/wiki/Compact_Disc_subcode

    Many players ignore it in favor of the Q Channel. It indicates a start of a new track by at least two consecutive seconds (150 sectors) of all 1s, and the last block with all 1s is the first block of the new track. Channel Q is used for control purposes of more sophisticated players. It has three different modes, but with a common structure for ...

  5. Music box - Wikipedia

    en.wikipedia.org/wiki/Music_box

    A music box (American English) or musical box (British English) is an automatic musical instrument in a box that produces musical notes by using a set of pins placed on a revolving cylinder or disc to pluck the tuned teeth (or lamellae) of a steel comb.

  6. LP record - Wikipedia

    en.wikipedia.org/wiki/LP_record

    The LP (from long playing [2] or long play) is an analog sound storage medium, specifically a phonograph record format characterized by: a speed of 33 + 1 ⁄ 3 rpm; a 12- or 10-inch (30- or 25-cm) diameter; use of the "microgroove" groove specification; and a vinyl (a copolymer of vinyl chloride acetate) composition disk.

  7. 5.1 surround sound - Wikipedia

    en.wikipedia.org/wiki/5.1_surround_sound

    Many DVD releases have Dolby Digital tracks up to 5.1 channels, due to the implementation of Dolby Digital in the development of the DVD format. In addition, some DVDs have DTS tracks, with most being 5.1 channel mixes (a few releases, however, have 6.1 "matrixed" or even discrete 6.1 tracks).

  8. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    3.5 cm – width of film commonly used in motion pictures and still photography; 3.78 cm – amount of distance the Moon moves away from Earth each year [113] 4.3 cm – minimum diameter of a golf ball [114] 5 cm – usual diameter of a chicken egg; 5 cm – height of a hummingbird, the smallest-known bird; 5.08 cm – 2 inches,

  9. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    The United States retained the ⁠ 1 / 39.37 ⁠-metre definition for surveying, producing a 2 millionth part difference between standard and US survey inches. [47] This is approximately ⁠ 1 / 8 ⁠ inch per mile; 12.7 kilometres is exactly 500,000 standard inches and exactly 499,999 survey inches.