In speech signal processing,acoustic featuresdescribe measurable physical properties of sound waves, such asduration(time length),frequency(pitch), andamplitude(loudness). These features are used in speech recognition and speaker identification systems.
Semantics, on the other hand, refers to the meaning of speech — a linguistic attribute, not an acoustic property. Therefore, it is not classified as an acoustic feature.
Exact Extract from HCIP-AI EI Developer V2.5:
"Speech features include duration, frequency, and amplitude. These are acoustic characteristics, distinct from semantic information, which relates to language meaning."
[Reference:HCIP-AI EI Developer V2.5 Official Study Guide – Chapter: Speech Feature Extraction, ]
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