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  2. Dolby noise-reduction system - Wikipedia

    en.wikipedia.org/wiki/Dolby_noise-reduction_system

    A Dolby noise-reduction system, or Dolby NR, is one of a series of noise reduction systems developed by Dolby Laboratories for use in analog audio tape recording. [1] The first was Dolby A, a professional broadband noise reduction system for recording studios that was first demonstrated in 1965, but the best-known is Dolby B (introduced in 1968), a sliding band system for the consumer market ...

  3. Ampex 2-inch helical VTR - Wikipedia

    en.wikipedia.org/wiki/Ampex_2-inch_helical_VTR

    From 1963 to 1970, Ampex manufactured several models of VTR 2-inch helical VTRs, capable of recording and playing back analog black and white video. Recording employed non-segmented helical scanning, with one wrap of the tape around the video head drum being a little more than 180 degrees, using two video heads. One video drum rotation time was ...

  4. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    This is because an engine's cyclic nature makes analysis and noise cancellation easier to apply. Modern mobile phones use a multi-microphone design to cancel out ambient noise from the speech signal. Sound is captured from the microphone(s) furthest from the mouth (the noise signal(s)) and from the one closest to the mouth (the desired signal).

  5. Video tape recorder - Wikipedia

    en.wikipedia.org/wiki/Video_tape_recorder

    A video tape recorder (VTR) is a tape recorder designed to record and playback video and audio material from magnetic tape. The early VTRs were open-reel devices that record on individual reels of 2-inch-wide (5.08 cm) tape.

  6. Betacam - Wikipedia

    en.wikipedia.org/wiki/Betacam

    The recording time is the same as for Betacam, 30 and 90 minutes for S and L, respectively. Tape speed is slightly slower in machines working in the 625/50 format, increasing tape duration by one minute for every five minutes of run time. So, a 90-minute tape will record 108 minutes of video in PAL.

  7. List of Sony Walkman products - Wikipedia

    en.wikipedia.org/wiki/List_of_Sony_Walkman_products

    The Sony Walkman X series was a touchscreen audio and video player that was on the market from 2009 to 2010, designed to compete against the iPod Touch. [65] It has a 3-inch (76 mm) OLED touch screen, internet access through Wi-Fi and digital noise-cancelling as well as applications for Slacker and YouTube. It was available in 16 GB and 32 GB ...

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