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Digital Data Modulation onto Analogue Signals

12 Questions

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Digital Data Modulation onto Analogue Signals

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Questions and Answers

What are the three characteristics of a carrier signal that can be modified in Digital Data / Analogue Signals Modulation?

Amplitude, Frequency, Phase (correct)

Resolution, Bit rate, Frequency

Color, Intensity, Duration

Wavelength, Volume, Speed

In the frequency domain, the modified carrier signal is centered around which frequency?

400-4000Hz

fc (correct)

What is the main purpose of using a MODEM in digital data transmission?

Enhance color depth

Increase data storage capacity

Create analog voice signals

Facilitate Full Duplex communications (correct)

Which modulation technique involves representing data using different amplitudes?

Amplitude shift keying Signup and view all the answers

What is the range of voice frequencies typically used in modulated analogue signals?

400 - 4000 Hz Signup and view all the answers

What is the purpose of creating multiple channels with carrier signals at different frequencies?

To allow data transmission through different paths simultaneously Signup and view all the answers

In Amplitude Shift Keying (ASK), how is a binary zero (Space) encoded?

By passing the Zero amplitude carrier signal to the output Signup and view all the answers

What does Frequency Shift Keying (FSK) use to encode a binary one (Mark)?

A signal operating at a frequency f2 Hz. Signup and view all the answers

Why does the carrier input in the modulator not exist in reality?

It is used only for demonstration purposes Signup and view all the answers

What parameter of the carrier signal is modified in Phase Shift Keying to represent data?

Phase Signup and view all the answers

What does Full Duplex communication mean?

Communicating in both directions simultaneously Signup and view all the answers

Why are ASK, FSK, and Phase Shift Keying techniques used in communication systems?

To represent data with different signal parameters Signup and view all the answers