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  2. Signal generator - Wikipedia

    en.wikipedia.org/wiki/Signal_generator

    In June 1928, the General Radio 403 was the first commercial signal generator ever marketed. It supported a frequency range of 500 Hz to 1.5 MHz. [2] Also, in April 1929, the first commercial frequency standard was marketed by General Radio with a frequency of 50 KHz.

  3. Infrasound - Wikipedia

    en.wikipedia.org/wiki/Infrasound

    Infrasound arrays at monitoring station in Qaanaaq, Greenland.. Infrasound, sometimes referred to as low frequency sound or incorrectly subsonic (subsonic being a descriptor for "less than the speed of sound"), [1] describes sound waves with a frequency below the lower limit of human audibility (generally 20 Hz, as defined by the ANSI/ASA S1.1-2013 standard). [2]

  4. 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

  5. General Instrument AY-3-8910 - Wikipedia

    en.wikipedia.org/wiki/General_Instrument_AY-3-8910

    The AY-3-8910 is a 3-voice programmable sound generator (PSG) designed by ... by 4096 means the lowest directly definable output frequency is 30.6 Hz, roughly equal ...

  6. Audio frequency - Wikipedia

    en.wikipedia.org/wiki/Audio_frequency

    An audio frequency or audible frequency (AF) is a periodic vibration whose frequency is audible to the average human. The SI unit of frequency is the hertz (Hz). It is the property of sound that most determines pitch. [1] The generally accepted standard hearing range for humans is 20 to 20,000 Hz.

  7. Texas Instruments SN76477 - Wikipedia

    en.wikipedia.org/wiki/Texas_Instruments_SN76477

    It can be most any wave shape and most any frequency from a few Hz to about several kHz and can range from a half a volt to a maximum of five volts. The Texas Instruments SN76488 "complex sound generator" is a sound chip produced by Texas Instruments, similar to the Texas Instruments SN76477 but with internal audio amplifier.

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