LSP (Line Spectrum Pair): Essential Technology for High-compression Speech Coding
Takehiro Moriya · NTT technical review · 2014
Line Spectrum Pair (LSP) technology was accepted as an IEEE (Institute of Electrical and Electronics Engineers) Milestone in 204.LSP, invented by Dr. Fumitada Itakura at NTT in 975, is an efficient method for representing speech spectra, namely, the shape of the vocal tract.A speech synthesis large-scale integration chip based on LSP was fabricated in 980.Since the 990s, LSP has been adopted in many speech coding standards as an essential component, and it is still used worldwide in almost all cellular phones and Internet protocol phones.