I have a time-based signal (Raw signal) sampled at 6 MHz and need to analyze it in freq. domain. I'm learning DSP and this is very first time I work with DSP. Could you please help to check if this code is correct or not. And I have couple of questions needed to be clarify:I've heard about linear scale and logarithm scale in order to observe the amplitude easier. Could you please explain to me, in this case, how can I get the logarithm scale?for some function in Matlab (for example fft, spectrogram, etc), how can I get the code (just in case I want to change something to adapt my need)?input=V5k_a100;  N=2048;     L=4096;    Fs=6e6;  spectrumTemp=[];for index=1:length(input)/L    slice = input(1+(index-1)*L:index*L);    abcd = hann(L) .* slice;    NFFT = 2^nextpow2(N);    spectrumTemp(index, :) = fft(abcd, NFFT)/L;  endf = [0:NFFT-1]*Fs/NFFT;  freq = f(1:length(f)/2);  time = [0:length(input)/L-1]*L/Fs;  spectrum = spectrumTemp(:, 1:length(f)/2);  mesh(time,freq',abs(spectrum'));
Calculate FFT from windowed time-based signal
matlab;signal processing