Title:
NEUROEVOLUTION-BASED ARTIFICIAL BANDWIDTH EXPANSION OF TELEPHONE BAND SPEECH
Document Type and Number:
WIPO Patent Application WO2005117517
Kind Code:
A3
Abstract:
Artificial bandwidth expansion devices, systems, methods and computer code products are disclosed for expanding a narrowband speech signal into an artificially expanded wideband speech signal. Embodiments of the invention can operate by forming an unshaped wideband signal based on the narrowband speech signal, such as through aliasing, and shaping the wideband signal into the artificially expanded wideband speech signal by amplifying/attenuating the unshaped wideband signal using a function generated by a neural network. Weights of the neural network can be set by a training/learning subsystem which generates genomes containing the neural network weights based on simulated environments in which a device employing the artificial bandwidth expansion is expected to operate.
Inventors:
KONTIO JUHO (FI)
ALKU PAAVO (FI)
LAAKSONEN LAURA (FI)
ALKU PAAVO (FI)
LAAKSONEN LAURA (FI)
Application Number:
PCT/IB2005/001248
Publication Date:
March 16, 2006
Filing Date:
May 09, 2005
Export Citation:
Assignee:
NOKIA CORP (FI)
NOKIA INC (US)
KONTIO JUHO (FI)
ALKU PAAVO (FI)
LAAKSONEN LAURA (FI)
NOKIA INC (US)
KONTIO JUHO (FI)
ALKU PAAVO (FI)
LAAKSONEN LAURA (FI)
International Classes:
G06N3/08; G10L19/14; G10L21/02; (IPC1-7): G10L21/02
Foreign References:
| US5978759A | 1999-11-02 | |||
| GB2357682A | 2001-06-27 |
Other References:
YASUKAWA H: "Wideband speech recovery from bandlimited speech in telephone communications", PROCEEDINGS OF THE 1998 IEEE INTERNATIONAL SYMPOSIUM ON MONTEREY, vol. 4, 31 May 1998 (1998-05-31), pages 202 - 205, XP010289405
WATANABE T ET AL: "Recovery of broadband speech from narowband speech by radiat basis function neural networks", IEEE TENCON, vol. 1, 28 October 2002 (2002-10-28), pages 469 - 472, XP010628525
MURAKAMI T ET AL: "Speech enhancement based on a combined higher frequency regeneration technique and RBF networks", IEEE TENCON, vol. 1, 28 October 2002 (2002-10-28), pages 457 - 460, XP010628522
WATANABE T ET AL: "Recovery of broadband speech from narowband speech by radiat basis function neural networks", IEEE TENCON, vol. 1, 28 October 2002 (2002-10-28), pages 469 - 472, XP010628525
MURAKAMI T ET AL: "Speech enhancement based on a combined higher frequency regeneration technique and RBF networks", IEEE TENCON, vol. 1, 28 October 2002 (2002-10-28), pages 457 - 460, XP010628522
Download PDF: