Anonymous
Anonymous asked in Science & MathematicsEngineering · 8 years ago

In FM transmissions, how do they piggyback the signal frequencies to the carrier frequency?

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  • 8 years ago
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    The signal frequencies change the frequency of the carrier frequency by a proportion known as deviation. So if signal frequency X modulates carrier Y then carrier Y will move to carrier X+Y and carrier X-Y in sympathy with signal X. For stereo transmissions the main carrier is modulated by signal X which is the Left+Right (L+R mono) signal. In addition a stereo subcarrier is modulated with the L-R signal Simple addition or subtraction will demodulate the separate L and R signals.

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