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The Importance of Amplitude Spectrum Over Phase Spectrum in Sound Analysis

The amplitude spectrum is crucial for understanding the characteristics of sound as it reveals the specific frequencies present and their amplitudes. In contrast, the phase spectrum lacks predictable information, hindering our ability to extract meaningful insights about sound structure. This piece examines amplitude spectra of two signals, [s] and [S], highlighting that the jiggly black curves represent Fourier amplitude spectra while the smoother red curves are spectrum envelopes. The unpredictable nature of phase spectra emphasizes the auditory system's preference for amplitude information, which is essential for sound perception.

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The Importance of Amplitude Spectrum Over Phase Spectrum in Sound Analysis

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Presentation Transcript

  1. Why is the amplitude spectrum important? Why is the phase spectrum unimportant?

  2. Amplitudespectraof [s] and [S]. Which is which? How can you tell? Amplitude Frequency p.s. On each plot, there is a jigglyblackcurve and a smoother redcurve. The black ones are Fourier amplitude spectra. What are the smoother red ones?

  3. Amplitude spectra of [s] and [S]. Which is which? How can you tell? [s] Amplitude [S] Frequency Answer: The smooth red curves are spectrum envelopes.

  4. Phasespectraof [s] and [S]. Which is which? Can’t tell? Neither can I. The two phase spectra are different, but (unlike the amplitude spectra) not in any predictable way.

  5. Moral: The amplitude spectrum tells you something useful about the nature of the sound. (It tells you what frequencies are present at what amps.) The phase spectrum does not. This is why the ear goes thru all the trouble to get rid of the phase information. [S] [s]

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