What do you understand by multirate signal processing?
In multirate digital signal processing the sampling rate of a signal is changed in or- der to increase the efficiency of various signal processing operations. Decimation, or down-sampling, reduces the sampling rate, whereas expansion, or up-sampling, fol- lowed by interpolation increases the sampling rate.
What is the purpose of an anti-imaging filter?
In a mixed-signal system (analog and digital), a reconstruction filter, sometimes called an anti-imaging filter, is used to construct a smooth analog signal from a digital input, as in the case of a digital to analog converter (DAC) or other sampled data output device.
What is anti-imaging filter?
A common name for the filter that is part of reconstructing an analog waveform at a D/A converter. The output of a digital system is usually in the form of a stair-stepped waveform with a great deal of high frequency energy known as “images,” hence the name anti-imaging filter.
What are the properties of a multirate filter?
Multirate filter design makes use of properties of decimation and interpolation (or expansion) in the design implementation of the filter. Decimation or downsampling by a factor of sample of a given sequence. Generally speaking, using decimation is very common in multirate filter designs.
How are multiple signals used in a multirate filter bank?
A multirate filter bank use a single input signal and then produces multiple outputs of the signal by filtering and subsampling. In order to split the input signal into two or more signals (see Figure 5) an analysis-synthesis system can be used . In figure 5, only 4 sub-signals are used.
When to use decimation in a multirate filter?
Generally speaking, using decimation is very common in multirate filter designs. In the second step, after using decimation, interpolation will be used to restore the sampling rate. The advantage of using decimators and interpolator is that they can reduce the computations when resulting in a lower sampling rate.
Which is a part of a multidimensional filter bank?
Multidimensional Filtering, downsampling, and upsampling are the main parts of multidimensional multirate systems and filter banks. A complete filter bank consists of the analysis and synthesis sides. The analysis filter bank divides an input signal to different subbands with different frequency spectra.