23EC301_SS_1.1

What is a signal?

• A static entity with no information

• A time varying phenomenon intended to convey information

• A random noise with no purpose

• A constant value with no variation

Which of the following is an example of a signal?

• A stock market index

• A blank piece of paper

• A closed door

• A silent room

What does a system do?

• Creates random signals

• Ignores all signals

• Processes input signals to produce output signals

• Stops all signals from passing through

How can systems be classified based on the number of inputs?

• Only single input (SI)

• No classification based on inputs

• Single input (SI) or multiple input (MI)

• Only multiple input (MI)

What is the difference between continuous-time (CT) and discrete-time (DT) signals?

• CT signals have continuous independent variables, while DT signals have discrete independent variables

• CT signals have discrete independent variables, while DT signals have continuous independent variables

• CT signals are always digital, while DT signals are always analog

• CT signals are always analog, while DT signals are always digital

Which of the following is an example of a continuous-valued CT signal?

• Voltage waveform

• Stock market index

• Digital audio

• Digital image

What is the dimensionality of a signal with one independent variable?

• Two dimensional

• One dimensional

• Multi-dimensional

• Three dimensional

What is the classification of a system that processes CT signals?

• Digital system

• Analog system

• Discrete-time (DT) system

• Continuous-time (CT) system

In a communication system, what is the role of the transmitter?

• Ignores the signal

• Processes the signal

• Transmits the signal

• Receives the signal

How are systems classified based on the types of signals they process?

• Only analog and digital

• Only one-dimensional and multi-dimensional

• Only continuous-time (CT) and discrete-time (DT)

• One-dimensional and multi-dimensional, continuous-time (CT) and discrete-time (DT), analog and digital