How did FM happen


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How did FM happen

Change of the audio signal is often cyclical.

One of the most easy to understand example of the audio modulation techniques violin and Vibrato, Vibrato through the fingers and wrist on the strings quickly fibrillation undergoing rapid changes in the length of the strings, which ultimately affect the softness of the violin sound.

FM radio waves, FM synthesis theory “also has a pronunciation (vector), and modulation of body two elements. Pronunciation body, said carrier body is the actual sound frequency oscillator; modulation body or modulator is responsible for adjustments and changes the carrier arising out of the sound. Carrier frequency, modulation of body frequency and modulation magnitude is an important factor in the theory of FM synthesis.

Most basic FMinstrument include two sinusoidal oscillator, a stable carrier frequency fc (CarrierFrequnecy) oscillator; one is FM (ModulationFrequency) oscillator.

The carrier frequency was added to the output of the modulation oscillator. The carrier oscillator is a simple sine wave frequency with fc frequency modulator occurs, the signal from the modulation oscillator with fm frequency sine wave, driven by the carrier oscillator frequency upward or downward movements, For example, a 250Hz sine wave modulation wave modulation of a 1000Hz sine wave carrier, it means the carrier generated 1000Hz frequency per second to accept the 250 times the impact of the modulation. System of the body and the carrier body are frequency, amplitude, waveform, periodic or quasi-periodic oscillator.

Therefore, in the process of frequency modulation, we can find:
(1) A modulation frequency of the body carrier frequency of the speed change.
(2) modulation depth variation of the amplitude of the carrier frequency.
(3) modulation of the waveform (or timbre) of the carrier frequency of the waveform changes.
(4) the amplitude of the carrier body in the frequency modulation process remains unchanged.

 

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