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  2. VU meter - Wikipedia

    en.wikipedia.org/wiki/VU_meter

    An analog VU meter with peak LED. A volume unit (VU) meter or standard volume indicator (SVI) is a device displaying a representation of the signal level in audio equipment.. The original design was proposed in the 1940 IRE paper, A New Standard Volume Indicator and Reference Level, written by experts from CBS, NBC, and Bell Telephone Laboratories. [1]

  3. LM3914 - Wikipedia

    en.wikipedia.org/wiki/LM3914

    The LM3914 is an integrated circuit (IC), designed by National Semiconductor in the late 1970s, used to operate displays that visually show the magnitude of an analog signal. [1] It can drive up to 10 LEDs, LCDs, or vacuum fluorescent displays on its outputs. The linear scaling of the output thresholds makes the device usable, for example, as a ...

  4. List of projects published in Radio-Electronics magazine

    en.wikipedia.org/wiki/List_of_projects_published...

    LED VU meter for your hi-fi: Here's an all-electronic digital VU meter that you can add to your hi-fi system. Bradley Albing: 52/5: May 1981 Computer-to-Selectric interface: Part 2—An inexpensive way to use an IBM Selectric typewriter as a hard copy printer for your computer. E. G. Brooner: 52/5: May 1981 $60 modem: Give your computer a ...

  5. Peak programme meter - Wikipedia

    en.wikipedia.org/wiki/Peak_programme_meter

    These were Type II PPMs with the seven marks labelled −22, −16, −12, −8, −4, 0 and +4. ABC found that a modified version of the EBU meter based on the VU-meter 'A scale' was best, since it let operators use their usual jargon such as 'zero level' etc. [19] The appearance is similar to an EBU scale except that the numbers are 8 dB lower.

  6. Peak meter - Wikipedia

    en.wikipedia.org/wiki/Peak_meter

    This can be useful in many applications, but the human ear works much more like an average meter than a peak meter. The analog VU meters are actually closer to the human ear's perception of sound level because the response time was intentionally slow - around 300 milliseconds, [2] and thus, many audio engineers and sound professionals prefer to ...

  7. Broadcast-safe - Wikipedia

    en.wikipedia.org/wiki/Broadcast-safe

    Broadcast engineers in North America usually line up their audio gear to nominal reference level of 0 dB on a VU meter aligned to +4 dBu or -20 dBFS, in Europe equating to roughly +4 dBm or -18 dBFS. Peak signal levels must not exceed the nominal level by more than +10 dB.