Spectrogram with square or non-square magnitude of STFT power vs. magnitude

1. How is the magnitude of frequencies represented in a spectrogram?
2. What is a magnitude spectrogram?
3. Why would we use a Stft spectrogram for Analysing human speech?
4. How do you Analyse a spectrogram?

How is the magnitude of frequencies represented in a spectrogram?

In a spectrogram representation plot — one axis represents the time, the second axis represents frequencies and the colors represent magnitude (amplitude) of the observed frequency at a particular time.

What is a magnitude spectrogram?

The log-magnitude spectrogram is defined as the logarithmically scaled magnitude spectrum of a signal across time. The advantage of the log-magnitude spectrogram is that it shows how the energy distribution evolves. The disadvantage is that it represents only magnitude information.

Why would we use a Stft spectrogram for Analysing human speech?

The STFT is one of the most frequently used tools in speech analysis and processing. It describes the evolution of frequency components over time. Like the spectrum itself, one of the benefits of STFTs is that its parameters have a physical and intuitive interpretation.

How do you Analyse a spectrogram?

In the spectrogram view, the vertical axis displays frequency in Hertz, the horizontal axis represents time (just like the waveform display), and amplitude is represented by brightness. The black background is silence, while the bright orange curve is the sine wave moving up in pitch.