Which of the following describes combining speech with an RF carrier signal?

Which of the following describes combining speech with an RF carrier signal?

• A. Impedance matching
• B. Oscillation
• C. Modulation
• D. Low-pass filtering

Answer: (C)

The process of combining speech with an RF (radio frequency) carrier signal is known as modulation. This technique is fundamental in telecommunications, as it allows the transmission of audio signals over long distances by superimposing the audio information onto a carrier wave that operates at a much higher frequency. In modulation, the characteristics of the carrier signal—such as its amplitude, frequency, or phase—are varied in accordance with the input audio signal (the speech). This alteration makes it possible for the RF signal to carry the information and be broadcasted effectively. Modulation serves a crucial role in enabling radio stations to send music, voice, and other audio content to listeners across wide areas, allowing for efficient use of available frequencies and reducing interference between different channels. Other methods, such as impedance matching, oscillation, and low-pass filtering, have different purposes and functions that do not encompass the combination of speech and RF carriers. Impedance matching ensures that the maximum power is transferred in circuits, oscillation refers to the generation of waveforms, and low-pass filtering is used for allowing signals below a certain frequency to pass while attenuating higher frequencies. These concepts are important in their own right but do not describe the modulation process that allows audio signals to be carried by

The process of combining speech with an RF (radio frequency) carrier signal is known as modulation. This technique is fundamental in telecommunications, as it allows the transmission of audio signals over long distances by superimposing the audio information onto a carrier wave that operates at a much higher frequency.

In modulation, the characteristics of the carrier signal—such as its amplitude, frequency, or phase—are varied in accordance with the input audio signal (the speech). This alteration makes it possible for the RF signal to carry the information and be broadcasted effectively.

Modulation serves a crucial role in enabling radio stations to send music, voice, and other audio content to listeners across wide areas, allowing for efficient use of available frequencies and reducing interference between different channels.

Other methods, such as impedance matching, oscillation, and low-pass filtering, have different purposes and functions that do not encompass the combination of speech and RF carriers. Impedance matching ensures that the maximum power is transferred in circuits, oscillation refers to the generation of waveforms, and low-pass filtering is used for allowing signals below a certain frequency to pass while attenuating higher frequencies. These concepts are important in their own right but do not describe the modulation process that allows audio signals to be carried by