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  2. Blue box - Wikipedia

    en.wikipedia.org/wiki/Blue_box

    A different, single tone, referred to as single frequency (SF), was used as a line status signal. This new system allowed the telephone network to be increasingly automated by deploying the dialers and tone generators on an as-required basis, starting with the busier exchanges.

  3. 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.

  4. Federal Signal Modulator - Wikipedia

    en.wikipedia.org/wiki/Federal_Signal_Modulator

    The MCP or Modulator Power Plus Controller controller was pretty much the same thing as a MC except there were a few additions. More signals could be generated through the tone generator, and it could also be activated by Federal Signal's FSK (Frequency Shifting Keys) activation tones. Nothing else changed between the MC and the MCP.

  5. List of Hammond organs - Wikipedia

    en.wikipedia.org/wiki/List_of_Hammond_organs

    It consists of two units — a 3-octave mini keyboard attaching under the piano keyboard, and a tone cabinet including electronic sound generator, amplifier and loudspeaker. [42] The sound generator is based on a vacuum tube oscillator and octave divider circuits originally designed for Novachord. There are three minor changed models: [41]

  6. 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.

  7. Two-tone testing - Wikipedia

    en.wikipedia.org/wiki/Two-tone_testing

    Two-tone receiver testing using direct injection [8] Two-tone receiver testing using off-air method [9] A test setup suitable for testing receivers at microwave frequencies is shown in the figure. The two signal generators, F1 and F2, are combined using a directional coupler in reverse.

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