1. Non-uniformity of long-term power spectral density
For any kind of sound information, in a long time interval, the power distribution is greater in the low frequency part than in the high frequency part, and the power spectrum has obvious non-flatness. For a given frequency band, there is corresponding redundancy.
2. Language-specific short-term power spectral density
The speech signal peaks at certain frequencies, while the valleys appear at other frequencies. These formant frequencies have a large amount of energy, and they determine different speech characteristics. The power spectrum of the entire language is based on the pitch frequency. A structure that descends to higher harmonics is formed.
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