What is added to an FM speech channel to boost the higher audio frequencies?
A de-emphasis network
A harmonic enhancer
A heterodyne enhancer
A pre-emphasis network✓الإجابة الصحيحة
الشرح
A pre-emphasis network in the transmitter's audio chain boosts the higher speech frequencies before modulation, increasing their deviation. This lifts them above the noise, which in an FM detector rises with audio frequency.