Warped linear predictive coding (warped LPC orWLPC) is a variant oflinear predictive coding in which the spectral representation of the system is modified, for example by replacing the unit delays used in an LPC implementation with first-orderall-pass filters. This can have advantages in reducing the bitrate required for a given level of perceived audio quality/intelligibility, especially inwideband audio coding.

Warped LPC was first proposed in 1980 by Hans Werner Strube.

• Oppenheim, Alan V.; Johnson, D.H. (June 1972), "Discrete representation of signals",Proceedings of the IEEE,60 (6):681–691,CiteSeerX 10.1.1.456.9776,doi:10.1109/PROC.1972.8727
• Strube, Hans Werner (Oct 1980),"Linear prediction on a warped frequency scale"(PDF),Journal of the Acoustical Society of America,68 (4):1071–1076,Bibcode:1980ASAJ...68.1071S,doi:10.1121/1.384992, archived fromthe original(PDF) on 2014-08-26, retrieved2014-08-24
• Härmä, Aki; Laine, Unto K. (July 2001),"A comparison of warped and conventional linear predictive coding"(PDF),IEEE Transactions on Speech and Audio Processing,9 (5):579–588,CiteSeerX 10.1.1.99.1455,doi:10.1109/89.928922
• Kruger, Elmar; Strube, Hans Werner (September 1988), "Linear prediction on a warped frequency scale",IEEE Transactions on Acoustics, Speech, and Signal Processing,36 (9):1529–1531,doi:10.1109/29.90384
• Laine, Unto K.; Karjalainen, Matti A.; Altosaar, Toomas (April 1994),"Warped linear prediction (WLP) in speech and audio processing"(PDF),1994 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP-94), vol. III, pp. III–349–III–352,doi:10.1109/ICASSP.1994.390018,ISBN 978-0-7803-1775-8,S2CID 11597755, archived fromthe original(PDF) on 2016-03-03, retrieved2014-08-24

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