Convert magnitude to decibels
Design a 3rd-order highpass Butterworth filter having a normalized 3-dB frequency of rad/sample. Compute its frequency response. Express the magnitude response in decibels and plot it.
[b,a] = butter(3,0.5,'high'); [h,w] = freqz(b,a); dB = mag2db(abs(h)); plot(w/pi,dB) xlabel('\omega / \pi') ylabel('Magnitude (dB)') ylim([-82 5])
Repeat the computation using
y— Input array
Input array, specified as a scalar, vector, matrix, or N-D array. When
y is nonscalar,
mag2db is an