The discussion centers on the effects of aliasing when sampling a 1 Hz signal at a frequency of 5 Hz (one sample every 0.2 seconds). It is established that to accurately sample a frequency, the Nyquist theorem requires a minimum sampling frequency of twice the target frequency. Consequently, when sampling higher frequencies such as 4 Hz and 11 Hz with the same 5 Hz sampling rate, significant aliasing occurs, making it difficult to distinguish between the signals. The participants emphasize the importance of understanding sampling rates to avoid misinterpretation of digitalized signals.
PREREQUISITESStudents and professionals in signal processing, audio engineering, and telecommunications who need to understand the implications of sampling rates and aliasing in digital signals.
Do you mean 0.2s duration of sampling (with a given sampling frequency), or do you mean one sample every 0.2s (5Hz sampling frequency)?kakolukia786 said:Hi. I have been given a plot for 1 Hz, sampled at 0.2 sec. And, 4 Hz and 11 Hz has also been plotted. So, from the plot, I can see that its really hard to distinguish between the signals after digitalization. My question is how do I find the next higher frequency which, when sampled at 0.2 secs, will look like a 1 Hz wave ?
kakolukia786 said:I mean one sample every 0.2 seconds