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Patent Searching and Data


Title:
BANDWIDTH EXTENSION VIA CONSTRAINED SYNTHESIS
Document Type and Number:
WIPO Patent Application WO/2013/188562
Kind Code:
A3
Abstract:
Audio signal bandwidth extension is performed on a narrow bandwidth signal received from a remote source over the audio communication network. The narrow band signal bandwidth is extended such that the bandwidth is greater than that of the audio communication network. The signal is extended by synthesizing an audio signal having spectral values within an extended bandwidth from synthetic components. The synthetic components may be generated using parameters derived from original narrowband audio signal. The audio signal may be synthesized in the form of an excitation signal and vocal tract envelope. The excitation signal and vocal tract may be extended independently. In various embodiments, excitation components may be derived from constrained synthesis using a constraint filter with nulls in regions where the extension is desired.

Inventors:
AVENDANO CARLOS (US)
ATHINEOS MARIOS (US)
DUNI ETHAN (US)
Application Number:
PCT/US2013/045462
Publication Date:
February 27, 2014
Filing Date:
June 12, 2013
Export Citation:
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Assignee:
AUDIENCE INC (US)
International Classes:
G10L19/00
Domestic Patent References:
WO1984000634A11984-02-16
Foreign References:
US20070005351A12007-01-04
US20110224994A12011-09-15
Attorney, Agent or Firm:
DRAPINSKI, James W. et al. (120 Constitution DriveMenlo Park, California, US)
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