View source for Warped linear predictive coding

{{Short description|Linear predictive coding}}
'''Warped linear predictive coding''' ('''warped LPC''' or '''WLPC''') is a variant of [[linear 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-order [[all-pass filter]]s. This can have advantages in reducing the bitrate required for a given level of perceived audio quality/intelligibility, especially in [[wideband]] audio coding.

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

==References==
* {{Citation |last1=Oppenheim |first1=Alan V. |last2=Johnson |first2=D.H. |title=Discrete representation of signals |journal=Proceedings of the IEEE |volume=60 |number=6 |pages=681–691 |date=June 1972 |doi=10.1109/PROC.1972.8727|citeseerx=10.1.1.456.9776 }}
* {{Citation |last=Strube |first=Hans Werner |url=http://148.204.64.201/paginas%20anexas/voz/articulos%20interesantes/coclea/StrJ68-1071-1076.pdf |title=Linear prediction on a warped frequency scale |journal=Journal of the Acoustical Society of America |volume=68 |number=4 |pages=1071–1076 |date=Oct 1980 |doi=10.1121/1.384992 |bibcode=1980ASAJ...68.1071S |access-date=2014-08-24 |archive-date=2014-08-26 |archive-url=https://web.archive.org/web/20140826114908/http://148.204.64.201/paginas%20anexas/voz/articulos%20interesantes/coclea/StrJ68-1071-1076.pdf |url-status=dead }}
* {{Citation |last1=Härmä |first1=Aki |last2=Laine |first2=Unto K. |date=July 2001 |url=http://www.acoustics.hut.fi/~aqi/wwwPhD/P8.PDF |title=A comparison of warped and conventional linear predictive coding |journal=IEEE Transactions on Speech and Audio Processing |volume=9 |number=5 |pages=579–588 |doi=10.1109/89.928922 |citeseerx = 10.1.1.99.1455 }}
* {{Citation |last1=Kruger |first1=Elmar |last2=Strube |first2=Hans Werner |title=Linear prediction on a warped frequency scale |journal=IEEE Transactions on Acoustics, Speech, and Signal Processing |volume=36 |number=9 |pages=1529–1531 |date=September 1988 |doi=10.1109/29.90384 }}
* {{Citation |last1=Laine |first1=Unto K. |last2=Karjalainen |first2=Matti A. |last3=Altosaar |first3=Toomas |contribution-url=http://users.spa.aalto.fi/mak/PUB/ICASSP-94Laine.pdf |contribution=Warped linear prediction (WLP) in speech and audio processing |title=1994 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP-94) |volume=III |pages=III–349–III–352 |date=April 1994 |doi=10.1109/ICASSP.1994.390018 |isbn=978-0-7803-1775-8 |s2cid=11597755 |access-date=2014-08-24 |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303224219/http://users.spa.aalto.fi/mak/PUB/ICASSP-94Laine.pdf |url-status=dead }}

{{Compression Methods}}

[[Category:Digital signal processing]]
[[Category:Data compression]]


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