Howtosignalprocessing
- How do you normalize frequency response?
- How do you read a frequency response chart?
- How do you convert normalized frequency to actual frequency?
- What is normalized frequency in filter design?
How do you normalize frequency response?
You need only divide the frequency in cycles by the number of samples. For example, a frequency of two cycles is divided by 50 samples, resulting in a normalized frequency of f = 1/25 cycles/sample. This means that it takes 25, the reciprocal of f, samples to generate one cycle of the sine wave.
How do you read a frequency response chart?
The horizontal numbers in a microphone frequency response chart indicate frequencies (again, usually over the 20 Hz to 20 kHz range), and the vertical numbers represent relative output level in dB (decibels). As you look at a frequency chart, you can tell how a given microphone performs at certain frequencies.
How do you convert normalized frequency to actual frequency?
To convert normalized frequency back to hertz, multiply by half the sample frequency.
What is normalized frequency in filter design?
Normalized frequency is a ratio of a specific frequency (e.g., the cutoff frequency for a filter) to twice the sampling frequency. For example, if the sampling frequency is 8000 Hz, and you want to filter at the 500 Hz point, then the normalized frequency would be 500/(2*8000) = 5/160.
