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The significance is a constant time delay for all frequencies. Time delay is the derivative of phase with respect to frequency, so given a linear phase as shown, the time delay is constant. Notice that the abrupt steps in phase actually only occur when the magnitude goes through zero so does not effect the nature of it being a "linear phase" filter....


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Can I use any kind of transform to make spectrogram? If your input signal is a finite length sequence and you want to analyze how the frequency domain components are varying in that input sequence, you have to use one of the techniques used for time-frequency analysis. STFT is one such technique, there are others also like wavelet transform, quadratic time-...


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