This will allow greater frequency resolutions at low frequencies for vibration measurements and similar applications. usually refers to one step of the process, but sometimes the terms are used interchangeably. Since the sampling rate is reduced to 3/5*Fs, the aliasing happens. Decimation is the process which decreases the sampling rate of the signal. Some applications of multirate Given X with sampling rate Ft Hz and is used to generate another sequence Y with sampling rate Ft' Hz, then Sampling Rate ratio R is given by, Ft' R = ---- Ft if R > 1, sampling process is known as interpolation R < 1, sampling process is known as decimation Example Usage: t = 1:1/10:2; X = sin (2 * pi * 10 * t) % 10 Hz sine wave Decimation Ratio The decimation ratio value controls the ratio with which the digitized audio is down-sampled". That is, the frequency component between 3/10*Fs to 5/10*Fs can not be represented correctly. The problem is there really is no guarantee that your received signal is 40MHz, esp. In this case, we must use a process called decimation to reduce the sampling rate of the signal. The figure(a) is the original one you provided. Decimating, or downsampling, a signal x(n) by a factor of D is the process of creating a new signal y(n) by taking only every Dth sample of x(n). Decimation, or down-sampling, reduces the sampling rate, whereas expansion, or up-sampling, fol-lowed by interpolation increases the sampling rate. Complementary to upsampling, or interpolation, which increases sampling rate, decimation is a specific case of sample rate conversion in a multi-rate digital signal processing system. Oversampling is capable of improving resolution and signal-to-noise … The process Of sampling rate converston in the digital domain can be viewed as a linear filtering operation. The process of reducing a sampling rate by an integer factor is referred to as downsampling of a data sequence.We also refer to downsampling as ''decimation'' (not taking one of ten). This feature is used to achieve a lower sampling rate than that supported by the sound card. Decimation process Decimation. The figure(b) is my answer. The Nyquist rate is defined as twice the bandwidth of the signal. This page describes decimation process with figures and example,mention matlab command for decimation. Hence it is also called Down sampling. in communication where additive white noise (AWGN) is a big part of the model. In multirate digital signal processing the sampling rate of a signal is changed in or-der to increase the e–ciency of various signal processing operations. In signal processing, oversampling is the process of sampling a signal at a sampling frequency significantly higher than the Nyquist rate.Theoretically, a bandwidth-limited signal can be perfectly reconstructed if sampled at the Nyquist rate or above it. The term ''decimation'' used for the downsampling process has been … Therefore y(n) is simply x(Dn). The input signal x(n) is characterized by the sampling rate FI = 1/Tx and the output signal y(m) is characterized by the sampling rate Fy = where and are the corre- sponding sampling intervals. 10.1(a). 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 rate is lower than the sampling rate of the available data. as illustrated in Fig.

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