Howtosignalprocessing
A square wave consists of a fundamental sine wave (of the same frequency as the square wave) and odd harmonics of the fundamental. The amplitude of the harmonics is equal to 1/N where N is the harmonic (1, 3, 5, 7…).
- How do you find the fundamental frequency of a square wave?
- How many frequency components make up a square wave?
- Does a square wave have a DC component?
- What is the FFT of a square wave?
How do you find the fundamental frequency of a square wave?
The fundamental frequency (f in Hz) of a square wave is f=1/T, where T is the square wave's period in units of seconds.
How many frequency components make up a square wave?
The ideal square wave contains only components of odd-integer harmonic frequencies (of the form 2π(2k − 1)f). Sawtooth waves and real-world signals contain all integer harmonics.
Does a square wave have a DC component?
There is no such thing as the DC value of a square wave. You can talk about the mean or average value. Of course, if you look at it in the frequency domain, you could say it has a 'DC component'.
What is the FFT of a square wave?
In the frequency domain, the overall average of a signal is its content at DC or 0Hz -- so that's why there's a peak at 0Hz. The FFT of a square wave that is centered on 0V has energy at every odd harmonic, starting at 1.
