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  2. Reference tone - Wikipedia

    en.wikipedia.org/wiki/Reference_tone

    In telecommunication, a standard test tone is a pure tone with a standardized level generally used for level alignment of single links and of links in tandem. [1]For standardized test signal levels and frequencies, see MIL-STD-188-100 for United States Department of Defense (DOD) use, and the Code of Federal Regulations Title 47, part 68 for other Government agencies.

  3. Fire alarm notification appliance - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_notification...

    95 dB @ 3,100 Hz tone are used in many current notification devices. [1] 80 dB @ 520 Hz tone are used in newer notification devices. [1] 70 dB to 100 dB weighted for human hearing (higher decibels, in the 100 to 115 dB range, were common with older electromechanical horns) [citation needed] Light (visible signals) 15 cd to 1,000 cd candela ...

  4. Programmable sound generator - Wikipedia

    en.wikipedia.org/wiki/Programmable_sound_generator

    A programmable sound generator (PSG) is a sound chip that generates (or synthesizes) audio wave signals built from one or more basic waveforms, and often some kind of noise. PSGs use a relatively simple method of creating sound compared to other methods such as frequency modulation synthesis or pulse-code modulation .

  5. Crystal oscillator frequencies - Wikipedia

    en.wikipedia.org/wiki/Crystal_oscillator_frequencies

    Digital signal generator Exact frequency is 2^28/10 Hz. Used to drive a DDS synthesizer with 28-bit accumulator; gives output from 0 to 2.68435 MHz in 0.1 Hz steps. Instek SFG-1000 series is one example. 26.975 RC 27 MHz band, band 0/1 (grey/brown), "split" frequency; radio-controlled models of cars, boats, aircraft [29] 26.995 RC

  6. Specific Area Message Encoding - Wikipedia

    en.wikipedia.org/wiki/Specific_Area_Message_Encoding

    (On weather radio in Canada the 1050 Hz tone is only used with three event codes: RMT, SVR & TOR [11]) Single 1050 Hz ⓘ audio tone used by NOAA Weather Radio. Combined 853 and 960 Hz ⓘ tones for broadcast radio/TV. Message — An audio message. The FCC permits encoded video or text in lieu of an audio message, but neither are implemented in ...

  7. Mel scale - Wikipedia

    en.wikipedia.org/wiki/Mel_scale

    Some non-mel auditory-frequency-scale formulas use the same form but with much lower break frequency, not necessarily mapping to 1000 at 1000 Hz; for example the ERB-rate scale of Glasberg and Moore (1990) uses a break point of 228.8 Hz, [15] and the cochlear frequency–place map of Greenwood (1990) uses 165.3 Hz.

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