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Latest revision as of 10:00, 14 March 2015
Contents
- 1 1. Introduction
- 1.1 Sampling is essential to convert analog signal to digital signal. In this page, I would specificallyexplain about downsampling. In digital signal processing, the decimator performs decimation, which isdownsampling a signal. In other words, when a digital signal is downsampled, the signal's samplingrate would be reduced.
- 1.2
- 2
- 3 2. Derivation
- 4
- 5 3. Example
- 6 If) D = 2
- 7
- 8
- 9 4. Conclusion
1. Introduction
Sampling is essential to convert analog signal to digital signal. In this page, I would specifically
explain about downsampling. In digital signal processing, the decimator performs decimation, which is
downsampling a signal. In other words, when a digital signal is downsampled, the signal's sampling
rate would be reduced.
2. Derivation
3. Example
If) D = 2
4. Conclusion
Downsampling reduces the magnitude by a factor of D, and increases the width of signals by D in the frequency domain. Moreover, it repeats it's signals every 2π and to prevent aliasing, decimator needs a lowpass filter before the downsampling.
Questions and comments
If you have any questions, comments, etc. please post them on this page.
