Spectral envelope

A spectral envelope is a curve in the frequency-amplitude plane, derived from a Fourier magnitude spectrum. It describes one point in time (one window, to be precise). The following properties are desirable for spectral envelopes: Envelope fit.

1. What is a spectral envelope of sound?
2. What is spectrum of a signal?
3. What is the amplitude envelope of a sound?
4. What does power spectral density tell us?

What is a spectral envelope of sound?

Spectral envelope is the shape of the power spectrum of sound. It is an important cue for the identification of sound sources such as voices or instruments, and particular classes of sounds such as vowels.

What is spectrum of a signal?

The signal spectrum describes a signal's magnitude and phase characteristics as a function of frequency. The system spectrum describes how the system changes signal magnitude and phase as a function of frequency. For example, At the lower frequencies, below around 80 Hz, the magnitude spectrum is 1.0.

What is the amplitude envelope of a sound?

Amplitude envelope refers to the changes in the amplitude of a sound over time, and is an influential property as it affects our perception of timbre. This is an important property of sound, because it is what allows us to effortlessly identify sounds, and uniquely distinguish them from other sounds.

What does power spectral density tell us?

Power spectral density specifies the power levels of the frequency components present in a signal. It is denoted as PSD inshort. The PSD specifies the power of various frequencies present in the signal and we can determine the range of power over which the signal frequencies are operating at.