In FM stereo broadcasts, why are the left and right audio signals first converted to L+R and L-R signals before being frequency modulated?
A) This permits higher intelligence frequencies to be used
B) This permits compatibility between monaural and stereo systems
C) This is necessary to be able to be multiplexed properly
D) This produces higher signal-to-noise ratios

Question

Quizplus · Accepted Answer

This method allows monaural receivers to decode the sum signal (L+R) for compatibility, while stereo receivers can process both the sum (L+R) and difference (L-R) signals to separate the left and right channels.

In FM Stereo Broadcasts, Why Are the Left and Right