Calculating phase of DFT sinewave?

1. How do you find the phase of a sine wave?
2. How do you calculate the phase of a signal?
3. How do you calculate phase frequency?
4. How do you calculate phase in FFT?

How do you find the phase of a sine wave?

To get the phase shift in the usual unit, which is radian, use phi = timeDelta * f * 2pi . Generally, the phase shift is the x-distance between (0.0, 0.0) and the next zero-crossing to the left, given in an angle, usually in radian, sometimes also given in degree.

How do you calculate the phase of a signal?

Calculating Phase Shift

The phase shift equation is ps = 360 * td / p, where ps is the phase shift in degrees, td is the time difference between waves and p is the wave period. Continuing the example, 360 * -0.001 / 0.01 gives a phase shift of -36 degrees.

How do you calculate phase frequency?

Frequency is commonly measured in Hertz, or cycles per second. Time is measured in seconds. So frequency x time = (cycles/sec) x sec = # of cycles. Thus two sine waves differing in frequency by 200 Hz get progressively out of phase with each other by 200 cycles every second.

How do you calculate phase in FFT?

y = fft(data,NFFT)/count; You have to normalise the result by the length of the original data (the 'energy' in the original signal) to get the correct amplitudes for the double-sided Fourier transform. (To get the correct amplitudes for the single-sided Fourier transform, you coded it correctly in multiplying it by 2.)