MODULATION PROCESS

What is modulation?

• Modulation is the process of varying a carrier signal's properties to transmit information.
• Modulation is the process of amplifying signals for long-distance communication.
• Modulation is the process of encrypting data for secure transmission.
• Modulation is the process of converting digital signals to analog signals.

What does the information (modulating) signal do to the carrier signal?

• Stabilizes the carrier signal frequency
• Modulates the carrier signal by changing either its amplitude, frequency, or phase.

• Eliminates the carrier signal entirely
• Increases the carrier signal strength

What is a modulated signal?

• A modulated signal is a signal that remains constant in all properties.
• A modulated signal is a signal that carries no information.
• A modulated signal is a signal that only varies in amplitude.
• A modulated signal is a signal in which one of the properties (such as amplitude, frequency, or phase) varies in order to carry information.

What happens during the modulation process?

• The low frequency baseband information signal is transformed into a higher frequency passband signal.

• The data is decoded for reception.
• The signal is amplified before transmission.
• The frequency of the carrier signal remains constant.

Where is modulation performed and by what circuit?

• • In a receiver by a circuit called a Demodulator.

• • In a transmitter by a circuit called a Demodulator.

• • In a receiver by a circuit called a Modulator.

• • In a transmitter by a circuit called a Modulator.

What forms can the information signal take?

• • Only analog form.

• • Only digital form.

• • Neither analog nor digital forms.

• • Both analog and digital forms.

What is demodulation?

• A. The process of converting the information signal into a high frequency signal.

• The reverse process of modulation, extracting the information signal from the modulated-carrier signal.

• The process of amplifying the carrier signal.

• The process of generating the carrier signal.

Where is demodulation performed and by what circuit?

• • In a receiver by a circuit called a Demodulator.

• In a transmitter by a circuit called a Modulator.

• In a receiver by a circuit called a Modulator.

• • In a transmitter by a circuit called a Demodulator.

What is the outcome of demodulation?

• • A high-frequency passband signal.

• • An amplified carrier signal.

• • The original information signal.

• • A modulated carrier signal.

Which of the following is an example of modulation transforming a signal?

• • Transforming a high-frequency audio signal into a low radio-frequency (RF) signal.

• • Transforming a low-frequency audio signal into a high radio-frequency (RF) signal.

• • Transforming a high-frequency RF signal into a low-frequency audio signal.

• • Transforming a digital signal into an analog signal without changing frequency.