What is discrete-time signals?

What is discrete-time signals?

A discrete signal or discrete-time signal is a time series consisting of a sequence of quantities. Unlike a continuous-time signal, a discrete-time signal is not a function of a continuous argument; however, it may have been obtained by sampling from a continuous-time signal.

What are the different types of discrete-time signals?

Discrete time signals can be classified as follows:

• Even and odd signals.
• Periodic and non-periodic signals.
• Deterministic and random signals.
• Energy signals and power signals.
• Muitichannel and multidimensional signals.

What is scaling of signals?

Scaling of a signal means, a constant is multiplied with the time or amplitude of the signal.

How are discrete time signals and systems related?

10Chapter 2 Discrete-Time Signals and Systems Signal-processing systems may be classified along the same lines as signals. That is, continuous-time systems are systems for which both the input and the output are continuous-time signals, and discrete-time systems are those for which both the input and the output are discrete-time signals.

How is time scaling implemented in discrete time?

• Time scaling can be implemented in continuous time prior to sampling at a fixed rate, • or the sampling rate itself could be varied (again recall the Nyquist sampling rate). • In discrete time, a signal x = {x[k] | k 2 Z} can be decimated (subsampled) by an integer factorL6=0 to create the signalx Ldefined by x L[k]=x[kL], 8k2Z, i.e.,x

How are time scaling and decimation related in DSP?

However, in the case of discrete-time signals, time-scaling operations are manifested in the form of decimation and interpolation. Basically, when we perform time scaling, we change the rate at which the signal is sampled.

How is the unit sample sequence used in discrete time?

Theunit sample sequence(Figure 2.3a) is defined as the sequence δ[n]= 0,n= 0, 1,n= 0. (2.3) The unit sample sequence plays the same role for discrete-time signals and systems that the unit impulse function (Dirac delta function) does for continuous-time signals and systems.