Contents
What is the maximum frequency of discrete-time signals?
(2) shows that a signal with frequency π is an alternating signal, so ω=π clearly is the maximum possible frequency of a discrete-time signal.
What is a discrete time signal?
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.
Which is the best description of discrete sequences?
Discrete Sequences and Systems In general, the term signal processing refers to the science of analyzing time-varying physical processes. As such, signal processing is divided into two categories, analog signal processing and digital signal processing.
Which is the best description of a discrete time signal?
The term discrete-time signal is used to describe a signal whose independent time variable is quantized so that we know only the value of the signal at discrete instants in time. Thus a discrete-time signal is not represented by a continuous waveform but, instead, a sequence of values.
Why do we use abbreviated notation for discrete sequences?
Again, to keep the notation concise and still keep track of individual elements of the input and output sequences, an abbreviated notation is used as shown in Figure 1-2 (b) where n represents the integer sequence 0, 1, 2, 3, etc. Thus, x (n) and y (n) are general variables that represent two separate sequences of numbers.
How is the Fourier transform of a discrete periodic signal obtained?
For a discrete periodic signal you normally compute the Fourier series coefficients. They can be obtained from the DFT by dividing the output of the DFT by N, where number of samples in a period. The DFT assumes the signal is N-sample periodic anyway.