Digital Modulation Techniques Quiz

<p>In hertz (Hz), representing cycles per second (B)</p> Signup and view all the answers

<p>It modifies the phase of the carrier while maintaining amplitude and frequency. (B)</p> Signup and view all the answers

<p>When a high signal to noise ratio is needed. (B)</p> Signup and view all the answers

<p>Cycle (D)</p> Signup and view all the answers

<p>Controlling data transmissions effectively (A)</p> Signup and view all the answers

<p>It involves a phase shift of 180 degrees between binary values. (A)</p> Signup and view all the answers

<p>Greater power efficiency. (A), Lower error rates. (D)</p> Signup and view all the answers

<p>It can encode two bits onto one symbol using four phase shifts. (D)</p> Signup and view all the answers

<p>It has a low bandwidth efficiency. (B)</p> Signup and view all the answers

<p>It centralizes resource sharing by having dedicated servers. (C)</p> Signup and view all the answers

<p>For straightforward and decentralized resource sharing. (A)</p> Signup and view all the answers

<p>Long distance wireless communication. (C)</p> Signup and view all the answers

<p>Higher vulnerability to network failures. (A)</p> Signup and view all the answers

<p>To enable the selection of quantized values (C)</p> Signup and view all the answers

<p>By dividing amplitude by the zone height d (A)</p> Signup and view all the answers

<p>n bit = log 2 L (B)</p> Signup and view all the answers

<p>The input signal is higher than the last staircase value (A)</p> Signup and view all the answers

<p>It adjusts the modulator's step size based on signal changes (B)</p> Signup and view all the answers

<p>To create the analog signal from digital data (A)</p> Signup and view all the answers

<p>The difference between the actual amplitude and quantized value (D)</p> Signup and view all the answers

<p>Delta modulation records changes from the previous value rather than absolute values (C)</p> Signup and view all the answers

A digital modulation technique that transmits digital data over optical fiber, with simple and inexpensive receivers and transmitters. It uses less bandwidth than FSK, making it more bandwidth efficient.

A modulation technique that modifies the frequency of a carrier signal to reflect binary data. A higher frequency represents a binary high input, while a lower frequency represents a binary low input. It's less prone to noise issues than ASK but uses more bandwidth.

A modulation technique that modifies the phase of a carrier signal to represent binary data. It's more power efficient, less prone to errors, and carries data more efficiently than FSK.

A type of PSK using two phase reversals (0° and 180°). It's considered the most robust digital modulation technique for long-distance wireless communication.

A type of PSK using four phase reversals (0°, 90°, 180°, and 270°). It can encode two bits per symbol and has double the data rate carrying capacity of BPSK.

A network architecture where a central server manages resources and services for connected clients. Clients request services from the server, and the server provides them.

A type of network where each connected node (peer) acts as both a client and a server. Peers can directly share resources and communicate with each other without a central authority.

The process of converting a continuous analog signal into a discrete digital signal by dividing the signal range into a finite number of levels and assigning a specific digital value to each level.

A simplified digitalization technique that focuses on changes from the previous sample, creating a stream of bits representing small changes in the analog signal.

A technique that improves Delta Modulation by adapting the step size based on signal changes, allowing for more accurate representation of the original signal.

A modulation scheme with high power efficiency, less prone to errors, and higher data carrying capacity than ASK and FSK.

A modulation scheme with lower bandwidth efficiency, complex detection algorithms, and requiring a non-coherent reference signal.

A modulation scheme that is susceptible to noise interference, which can lead to data loss.

A modulation scheme known for its simpler transmitter and receiver design, especially for lower data rates.

A modulation technique that provides higher signal-to-noise ratio compared to other schemes like ASK.

A modulation scheme using simple receiver and transmitter design, making it cost-effective.

The carrier signal's amplitude remains constant in this modulation method, while the frequency changes.

The carrier signal's frequency remains constant in this modulation method, while the phase changes.

The carrier signal's phase remains constant in this modulation method, while the amplitude changes.

This modulation scheme uses a 180° phase shift difference between binary 1 and binary 0.

This modulation scheme uses phase shifts that are multiples of 90 degrees.

This modulation scheme encodes two bits per symbol, leading to a higher data rate compared to other schemes.

This modulation scheme encodes one bit per symbol, leading to a lower data rate compared to other schemes.