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  2. Power-on self-test - Wikipedia

    en.wikipedia.org/wiki/Power-on_self-test

    Macs made after 1987 but prior to 1998, upon failing the POST, will immediately halt with a "death chime", which is a sound that varies by model; it can be a simple beep, a car crash sound, the sound of shattering glass, a short musical tone, or more. On the screen, if working, will be the Sad Mac icon, along with two hexadecimal strings, which ...

  3. The Pip - Wikipedia

    en.wikipedia.org/wiki/The_Pip

    Its signal consists of short beeping sounds that repeat at a rate of approximately 50 beeps per minute. [3] It is transmitted on the frequency 5448 kHz during the day and 3756 kHz at night. [ 1 ] The times at which the station switches from the day to the night frequency or vice versa are changed over the course of the year, presumably to match ...

  4. Reorder tone - Wikipedia

    en.wikipedia.org/wiki/Reorder_tone

    In North America it is a dual-frequency tone of 620 Hz and 480 Hz interrupted 120 times per minute at a cadence of 0.25 seconds on, 0.25 off, i.e., two beeps per second. In EU countries and those following ETSI (European Telecommunication Standards Institute) recommendations, the cadence is the same as North America, i.e. 0.25 seconds on / 0.25 ...

  5. UVB-76 - Wikipedia

    en.wikipedia.org/wiki/UVB-76

    UVB-76 - "The Buzzer", recorded on 10 August 2022. The station is commonly known as "The Buzzer" [7] in both English and Russian (Russian: Жужжалка).From its first voice transmission in 1997 to 2010, the station identified itself as UZB-76 [8] [9] (Russian: УЗБ-76).

  6. MDC-1200 - Wikipedia

    en.wikipedia.org/wiki/MDC-1200

    MDC-systems have an option for selective calling. By pressing a series of keys on the encoder-decoder, the base station operator can send a data packet that activates a lighted indicator or makes the radio beep. On some radio models with alphanumeric displays, the display may flash CALL until a reset button is pressed. On radio models with ten ...

  7. Greenwich Time Signal - Wikipedia

    en.wikipedia.org/wiki/Greenwich_Time_Signal

    There are six pips (short beeps) in total, which occur on each of the 5 seconds leading up to the hour and on the hour itself. Each pip is a 1 k Hz tone (about a fifth of a semitone above musical B5) the first five of which last a tenth of a second each, while the final pip lasts half a second. The actual moment when the hour changes – the ...

  8. Busy signal - Wikipedia

    en.wikipedia.org/wiki/Busy_signal

    In the mid 1950s through the early 1980s, a telephone busy signal provided an early form of social media in many cities and towns of the United States, colloquially known as the "beep line" or "jam line".

  9. Quindar tones - Wikipedia

    en.wikipedia.org/wiki/Quindar_tones

    Therefore, those transmissions would consist of a "beep" (PTT press) followed by Houston talking, then another "beep" (PTT release) and finally the voice of the astronauts. Another misconception about Quindar tones is that they were designed to signal the end of a transmission, similar to a courtesy tone used on many half-duplex radio repeaters .