Linear Predictive Coding

Sound Production and Manipulation [SPM]  >  Synthesis and Resynthesis Techniques  ]

Linear predictive coding is one of a family of analysis/resynthesis techniques developed in the search for techniques for speech encoding, transmission and reception and is still the most widely used technique for computer-generated speech. LPC attempts to estimate the spectrum of a sound in terms of the filter coefficients which would be needed to synthesise that sound when applied to an ’excitation source’, which may be either noise (for unvoiced sounds), or a band-limited pulse wave in which all the harmonics are of equal amplitude. In a synthesis application, both the excitation waveform and the filter coefficients can be modified (in both the frequency and time domains) to create related variants of the original sound. (Source - Richard Dobson (1992). A Dictionary of Electronic and Computer Music Technology. Oxford University Press.)



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