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HandWiki. Decimation (Signal Processing). Encyclopedia. Available online: https://encyclopedia.pub/entry/35884 (accessed on 22 September 2026).
HandWiki. Decimation (Signal Processing). Encyclopedia. Available at: https://encyclopedia.pub/entry/35884. Accessed September 22, 2026.
HandWiki. "Decimation (Signal Processing)" Encyclopedia, https://encyclopedia.pub/entry/35884 (accessed September 22, 2026).
HandWiki. (2022, November 23). Decimation (Signal Processing). In Encyclopedia. https://encyclopedia.pub/entry/35884
HandWiki. "Decimation (Signal Processing)." Encyclopedia. Web. 23 November, 2022.
Decimation (Signal Processing)
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In digital signal processing, decimation is the process of reducing the sampling rate of a signal.  The term downsampling usually refers to one step of the process, but sometimes the terms are used interchangeably.  Complementary to upsampling, which increases sampling rate, decimation is a specific case of sample rate conversion in a multi-rate digital signal processing system. A system component that performs decimation is called a decimator. When decimation is performed on a sequence of samples of a signal or other continuous function, it produces an approximation of the sequence that would have been obtained by sampling the signal at a lower rate (or density, as in the case of a photograph). The decimation factor is usually an integer or a rational fraction greater than one. This factor multiplies the sampling interval or, equivalently, divides the sampling rate. For example, if compact disc audio at 44,100 samples/second is decimated by a factor of 5/4, the resulting sample rate is 35,280.

digital signal sample rate conversion downsampling

References

  1. Strang, Gilbert; Nguyen, Truong (1996-10-01). Wavelets and Filter Banks (2 ed.). Wellesley,MA: Wellesley-Cambridge Press. pp. 100–101. ISBN 0961408871. https://books.google.com/books?id=Z76N_Ab5pp8C&pg=PA101&lpg=PA101&dq=noble+identities+strang&source=bl&ots=qUVRdm_Bh1&sig=j6JbIy66PbqFVdrhigCHnjerNiI&hl=en&sa=X&ei=XKmtUs_FEKbD2AWinIHACQ&ved=0CC8Q6AEwAA#v=onepage&q=noble%20identities%20strang&f=false. 
  2. Realizable low-pass filters have a "skirt", where the response diminishes from near one to near zero. So in practice the cutoff frequency is placed far enough below the theoretical cutoff that the filter's skirt is contained below the theoretical cutoff.
  3. Some programs (such as MATLAB) that design filters with real-valued coefficients use the Nyquist frequency ([math]\displaystyle{ \tfrac }[/math]) as the normalization constant. That results in a Nyquist frequency of 1 and a periodicity of 2.
  4. Milić, Ljiljana (2009). Multirate Filtering for Digital Signal Processing. New York: Hershey. p. 192. ISBN 978-1-60566-178-0. "Generally, this approach is applicable when the ratio Fy/Fx is a rational, or an irrational number, and is suitable for the sampling rate increase and for the sampling rate decrease." 
  5. Slyusar V. I. Synthesis of algorithms for measurement of range to M sources with the use of additional gating of the ADC readings.// Radioelectronics and Communications Systems. - Vol. 39. - no. 5. - 1996. - P. 36 – 40. [1]
  6. T. Schilcher. RF applications in digital signal processing//” Digital signal processing”. Proceedings, CERN Accelerator School, Sigtuna, Sweden, May 31-June 9, 2007. - Geneva, Switzerland: CERN (2008). - P. 258. - DOI: 10.5170/CERN-2008-003. [2]
  7. Sliusar I.I., Slyusar V.I., Voloshko S.V., Smolyar V.G. Next Generation Optical Access based on N-OFDM with decimation.// Third International Scientific-Practical Conference “Problems of Infocommunications. Science and Technology (PIC S&T’2016)”. – Kharkiv. - October 3 –6, 2016. [3]
  8. Saska Lindfors, Aarno Pärssinen, Kari A. I. Halonen. A 3-V 230-MHz CMOS Decimation Subsampler.// IEEE transactions on circuits and systems— Vol. 52, No. 2, February 2005. – P. 110.
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