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  2. Phreaking box - Wikipedia

    en.wikipedia.org/wiki/Phreaking_box

    Tone generator, emits a 2600 Hz tone to disconnect a long-distance call while retaining control of a trunk, then generates multi-frequency tones to make another toll call which is not detected properly by billing equipment. Black box A resistor bypassed with a capacitor and placed in series with the line to limit DC current on received calls ...

  3. Tone generator - Wikipedia

    en.wikipedia.org/?title=Tone_generator&redirect=no

    This page was last edited on 1 October 2011, at 16:14 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...

  4. Signal generator - Wikipedia

    en.wikipedia.org/wiki/Signal_generator

    A signal generator is one of a class of electronic devices that generates electrical signals with set properties of amplitude, frequency, and wave shape. These generated signals are used as a stimulus for electronic measurements, typically used in designing, testing, troubleshooting, and repairing electronic or electroacoustic devices, though it often has artistic uses as well.

  5. Forrest Mims - Wikipedia

    en.wikipedia.org/wiki/Forrest_Mims

    The stepped-tone generator [49] is a circuit that utilizes a 556 dual timer IC. The controls are two potentiometers. Mims titled the circuit "Sound Synthesizer" in 1982 [50] then later called "Stepped-Tone Generator". The circuit creates sounds similar to a plucked violin. [49]

  6. Additive synthesis - Wikipedia

    en.wikipedia.org/wiki/Additive_synthesis

    Schematic diagram of additive synthesis. The inputs to the oscillators are frequencies and amplitudes .. Harmonic additive synthesis is closely related to the concept of a Fourier series which is a way of expressing a periodic function as the sum of sinusoidal functions with frequencies equal to integer multiples of a common fundamental frequency.

  7. 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 .

  8. Tonewheel - Wikipedia

    en.wikipedia.org/wiki/Tonewheel

    Simplified diagram of how a tonewheel works Goldschmidt tone wheel (1910), used as an early beat frequency oscillator. A tonewheel or tone wheel is a simple electromechanical apparatus used for generating electric musical notes in electromechanical organ instruments such as the Hammond organ and in telephony to generate audible signals such as ringing tone.

  9. Two-tone testing - Wikipedia

    en.wikipedia.org/wiki/Two-tone_testing

    A spectrum analyser – typically used as the measuring instrument in two-tone testing. Two-tone testing is a means of testing electronic components and systems, particularly radio systems, for intermodulation distortion. It consists of simultaneously injecting two sinusoidal signals of different frequencies (tones) into the component or system.

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