Howtosignalprocessing
- What is the frequency of a square wave?
- What is the FFT of a square wave?
- How do you describe a square wave?
- Why can you hear a 1 Hz square wave?
What is the frequency of a square wave?
A square wave is approximated by the sum of harmonics. In this particular SPICE simulation, I've summed the 1st, 3rd, 5th, 7th, and 9th harmonic voltage sources in series for a total of five AC voltage sources. The fundamental frequency is 50 Hz and each harmonic is, of course, an integer multiple of that frequency.
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.
How do you describe a square wave?
A square wave is a periodic wave that alternates between two fixed amplitudes for equal lengths of time. A square wave starts at one of two extreme voltages, not the mid point.
Why can you hear a 1 Hz square wave?
Because square and sawtooth wave have abrupt changes in pressure that can be detected at any frequency and sine waves have only smooth variation in pressure.
