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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.
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.
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.
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]
Two such walking ring counters are perhaps the simplest way to generate the continuous-phase frequency-shift keying used in dual-tone multi-frequency signaling and early modem tones. [4] A typical function generator can provide frequencies up to 20 MHz.
The waveforms' frequency and volume (and noise's tone and volume) are typically shaped using an envelope and/or mixed before being sent to the audio output stage. [1] Many PSGs feature three tone channels and one noise channel including the AY-3-8910, SN76489 and MOS Technology 6581.
Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. [1]
Frequency modulation synthesis (or FM synthesis) is a form of sound synthesis whereby the frequency of a waveform is changed by modulating its frequency with a modulator. The (instantaneous) frequency of an oscillator is altered in accordance with the amplitude of a modulating signal. [1] FM synthesis can create both harmonic and inharmonic sounds.
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