Source: http://www.google.com/patents/US8086451?ie=ISO-8859-1&dq=7,054,745
Timestamp: 2015-05-07 04:27:26
Document Index: 626795353

Matched Legal Cases: ['Application No. 06', 'Application No. 2008', 'Application No. 2006100647553', 'Application No. 2006800132165', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 06']

Patent US8086451 - System for improving speech intelligibility through high frequency compression - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA speech enhancement system that improves the intelligibility and the perceived quality of processed speech includes a frequency transformer and a spectral compressor. The frequency transformer converts speech signals from the time domain to the frequency domain. The spectral compressor compresses a...http://www.google.com/patents/US8086451?utm_source=gb-gplus-sharePatent US8086451 - System for improving speech intelligibility through high frequency compressionAdvanced Patent SearchPublication numberUS8086451 B2Publication typeGrantApplication numberUS 11/298,053Publication dateDec 27, 2011Filing dateDec 9, 2005Priority dateApr 20, 2005Also published asCA2569221A1, CA2569221C, CN101030382A, EP1796082A1, US8219389, US20060241938, US20120095759Publication number11298053, 298053, US 8086451 B2, US 8086451B2, US-B2-8086451, US8086451 B2, US8086451B2InventorsPhillip A. Hetherington, Xueman LiOriginal AssigneeQnx Software Systems Co.Export CitationBiBTeX, EndNote, RefManPatent Citations (115), Non-Patent Citations (15), Referenced by (6), Classifications (14), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetSystem for improving speech intelligibility through high frequency compression
This application is a continuation-in-part of U.S. application Ser. No. 11/110,556 �System for Improving Speech Quality and Intelligibility,� filed Apr. 20, 2005. The disclosure of the above application is incorporated herein by reference.
{ S ^ k = S k k = 1 , 2 , � , f o S ^ k = C k - f o  S k  S k k = f o + 1 , f o + 2 , � , N ( Equation 2 ) the frequencies to the functions shown in equation 2. In equation 2, Ŝk is the frequency component of compressed speech signal and fo is the cutoff frequency index. Based on this compression scheme, all frequency components of the original speech below the cutoff frequency index fo remain unchanged or substantially unchanged. Frequency components from cutoff frequency �A� to the Nyquist frequency are compressed and shifted to a lower frequency range. The frequency range extends from the lower cutoff frequency �A� to the upper cutoff frequency �B� which also may comprise the upper limit of a telephone or communication pass-band. In this enhancement system, higher frequency components have a higher compression ratio and larger frequency shifts than the frequencies closer to upper cutoff frequency �B.� These enhancement systems improve the intelligibility and/or perceptual quality of a speech signal because those frequencies above cutoff frequency �B� carry significant consonant information, which may be critical for accurate speech recognition.
g m =  N f o + m  / ∑ k = 1 N  N k  φ m ( k ) m = 1 , 2 , � , M ( Equation 3 ) where Nk is the frequency component of input background noise. By tracking gain to a measured or estimated noise level, some enhancements systems maintain a noise floor across a compressed and uncompressed bandwidth. If noise is sloped down as frequency increases in the compressed frequency band, as shown in FIG. 4, the compressed portion of the signal may have less energy after compression than before compression. In these conditions, a proportional gain may be applied to the compressed signal to adjust the slope of the compressed signal. In FIG. 4 the slope of the compressed signal is adjusted so that it is substantially equal to the slope of the original signal within the compressed frequency band. In some enhancement systems, the gain controller 106 will multiply the compressed signal shown in FIG. 4 with a multiplier that is equal to or greater than one and changes with the frequency of the compressed signal. In FIG. 4, the incremental differences in the multipliers across the compressed bandwidth will have a positive trend.
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COM-31, No. 5, May 1983, pp. 692-701.* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS8239208 *Apr 9, 2010Aug 7, 2012France Telecom SaSpectral enhancing method and deviceUS8285543 *Jan 24, 2012Oct 9, 2012Dolby Laboratories Licensing CorporationCircular frequency translation with noise blendingUS8457956 *Aug 31, 2012Jun 4, 2013Dolby Laboratories Licensing CorporationReconstructing an audio signal by spectral component regeneration and noise blendingUS20100250264 *Apr 9, 2010Sep 30, 2010France Telecom SaSpectral enhancing method and deviceUS20120128177 *Jan 24, 2012May 24, 2012Dolby Laboratories Licensing CorporationCircular Frequency Translation with Noise BlendingUS20120328121 *Aug 31, 2012Dec 27, 2012Dolby Laboratories Licensing CorporationReconstructing an Audio Signal By Spectral Component Regeneration and Noise Blending* Cited by examinerClassifications U.S. Classification704/225, 704/205, 704/201, 381/316, 381/321International ClassificationG10L19/14, H04R25/00, G10L21/00Cooperative ClassificationG10L21/02, G10L21/0232, G10L21/0264, G10L21/0364European ClassificationG10L21/02, G10L21/02A4Legal EventsDateCodeEventDescriptionApr 4, 2014ASAssignmentOwner name: 2236008 ONTARIO INC., ONTARIOFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:8758271 CANADA INC.;REEL/FRAME:032607/0674Effective date: 20140403Owner name: 8758271 CANADA INC., ONTARIOFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:QNX SOFTWARE SYSTEMS LIMITED;REEL/FRAME:032607/0943Effective date: 20140403Feb 27, 2012ASAssignmentOwner name: QNX SOFTWARE SYSTEMS LIMITED, CANADAFree format text: CHANGE OF NAME;ASSIGNOR:QNX SOFTWARE SYSTEMS CO.;REEL/FRAME:027768/0863Effective date: 20120217Jul 9, 2010ASAssignmentOwner name: QNX SOFTWARE SYSTEMS CO., CANADAFree format text: CONFIRMATORY ASSIGNMENT;ASSIGNOR:QNX SOFTWARE SYSTEMS (WAVEMAKERS), INC.;REEL/FRAME:024659/0370Owner name: QNX SOFTWARE SYSTEMS CO.,CANADAFree format text: CONFIRMATORY ASSIGNMENT;ASSIGNOR:QNX SOFTWARE SYSTEMS (WAVEMAKERS), INC.;REEL/FRAME:24659/370Effective date: 20100527Owner name: QNX SOFTWARE SYSTEMS CO., CANADAFree format text: CONFIRMATORY ASSIGNMENT;ASSIGNOR:QNX SOFTWARE SYSTEMS (WAVEMAKERS), INC.;REEL/FRAME:024659/0370Effective date: 20100527Jun 3, 2010ASAssignmentFree format text: PARTIAL RELEASE OF SECURITY INTEREST;ASSIGNOR:JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT;REEL/FRAME:024483/0045Free format text: PARTIAL RELEASE OF SECURITY INTEREST;ASSIGNOR:JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT;REEL/FRAME:024483/0045Free format text: PARTIAL RELEASE OF SECURITY INTEREST;ASSIGNOR:JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT;REEL/FRAME:024483/0045Owner name: HARMAN INTERNATIONAL INDUSTRIES, INCORPORATED, CONFree format text: PARTIAL RELEASE OF SECURITY INTEREST;ASSIGNOR:JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT;REEL/FRAME:024483/0045Owner name: QNX SOFTWARE SYSTEMS (WAVEMAKERS), INC., CANADAFree format text: PARTIAL RELEASE OF SECURITY INTEREST;ASSIGNOR:JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT;REEL/FRAME:024483/0045Owner name: QNX SOFTWARE SYSTEMS GMBH & CO. 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