In signal processing and related disciplines, aliasing is an effect that causes different signals to become indistinguishable (or aliases of one another) when sampled. It also often refers to the distortion or artifact that results when a signal reconstructed from samples is different from the original … See more When a digital image is viewed, a reconstruction is performed by a display or printer device, and by the eyes and the brain. If the image data is processed in some way during sampling or reconstruction, the … See more Sometimes aliasing is used intentionally on signals with no low-frequency content, called bandpass signals. Undersampling, which creates low-frequency aliases, can produce the same result, with less effort, as frequency-shifting the signal to lower frequencies before … See more Historically the term aliasing evolved from radio engineering because of the action of superheterodyne receivers. When the receiver shifts multiple signals down to lower frequencies, … See more Audio example The qualitative effects of aliasing can be heard in the following audio demonstration. Six sawtooth waves are played in succession, with the first two sawtooths having a fundamental frequency of 440 Hz (A4), the … See more Actual signals have a finite duration and their frequency content, as defined by the Fourier transform, has no upper bound. Some amount of aliasing always occurs when such … See more Sinusoids are an important type of periodic function, because realistic signals are often modeled as the summation of many sinusoids of different frequencies and different amplitudes … See more Aliasing occurs whenever the use of discrete elements to capture or produce a continuous signal causes frequency ambiguity. Spatial aliasing, … See more WebAn anti-aliasing condition for linear loudspeaker arrays was already derived in [1], [2]. However, no detailed analysis of the aliasing artifacts has been performed. This paper analyzes the ...
De-aliasing in Fast Fourier Transform - Mathematics
WebJun 24, 2013 · In this paper, we investigate the aliasing conditions of shifted-Fresnel diffraction and lessen the problems incurred based on the conditions. The improved diffraction is referred as to aliasing-reduced shifted and scaled (ARSS)-Fresnel diffraction. In section 2, we explain ARSS-Fresnel diffraction. WebUndersampling and Aliasing • When we sample at a rate which is less than the Nyquist rate, we say we are undersampling and aliasing will yield misleading results. • If we are … harris scarfe contigo
Aliasing and the Sampling Theorem Simplified
WebThis condition is known as aliasing. This is shown in figure-1. Anti-Aliasing Technique. In practical conditions, analog signal exists with noise energy. When this signal is sampled … WebAliasing is the process of letting one network device perform a task that would ordinarily be the responsibility of another. Aliasing is the way that EVPNs provide load-balancing to CEs that are in all-active mode, even when the MAC address is learned by only one of the multiple PEs. The PEs advertise the ESI in MAC routes for all-active mode. WebFor example, if you are acquiring data from eight channels at 100k samples/second, the sampling rate for one channel is 100 ksamples/second * 8, or 12.5 ksamples/second. In … charging a jackery