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Speech signal bandwidth extension device and method

A voice signal and bandwidth expansion technology, which is applied in the field of voice signal bandwidth expansion and voice signal bandwidth expansion devices, can solve problems such as large spectral distortion and reconstruction signal jumps

Active Publication Date: 2017-02-22
PKU HKUST SHENZHEN HONGKONG INSTITUTION +1
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  • Abstract
  • Description
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Problems solved by technology

[0006] Based on this, it is necessary to provide a voice signal bandwidth expansion device with high precision wideband spectral envelope estimation for the problems of relatively large spectral distortion and jumps in the spectrum of the reconstructed signal in traditional wideband spectral envelope estimation.

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  • Speech signal bandwidth extension device and method
  • Speech signal bandwidth extension device and method
  • Speech signal bandwidth extension device and method

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Embodiment Construction

[0053] A speech signal bandwidth extension device and a speech signal bandwidth extension method, when the speech signal bandwidth is extended, by using the hidden Markov model instead of the traditional estimation algorithm to estimate the wideband spectrum envelope, the reconstruction signal in the estimation algorithm is improved. The coherence of the wideband spectral envelope improves the accuracy of the wideband spectral envelope estimation and reduces the spectral distortion of the reconstructed wideband speech signal.

[0054] A voice signal bandwidth expansion device and a voice signal bandwidth expansion method according to the present invention will be further described in detail below with reference to the drawings and embodiments.

[0055] figure 1 As shown, it is a block diagram of a voice signal bandwidth expansion device according to an embodiment of the present invention.

[0056] A speech signal bandwidth extension device obtains and reconstructs a wideband ...

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Abstract

The invention discloses a voice signal bandwidth expansion device. According to the device, during voice signal bandwidth expansion, a full-band broadband excitation signal is generated by use of a cosine translation modulation method, and a wideband spectral envelope parameter is estimated by use of a hidden Markov model. The device reduces the spectral distortion of reconstructed wideband signals and ensures the spectrum coherence of reconstructed wideband signals. Meanwhile, the invention discloses a voice signal bandwidth expansion method.

Description

technical field [0001] The invention relates to the technical field of voice communication, in particular to a voice signal bandwidth expansion device and a voice signal bandwidth expansion method. Background technique [0002] The voice transmitted by the current communication network is a narrow-band voice whose bandwidth is limited to 300-3400 Hz, and the narrow-band voice is inferior to the wide-band voice with a bandwidth of 8000 Hz in terms of sound quality, clarity and intelligibility. In many important applications, the high-frequency components of speech are particularly important. For example, in applications such as videophones and conference calls, broadband speech will increase the presence of participants and better understand other people's speeches; For people with disabilities, the lack of high-frequency consonants is the main reason for their difficulty using the phone. Due to the superiority of wideband voice over narrowband voice, it is very meaningful t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/04G10L19/087G10L19/093
Inventor 张勇刘轶
Owner PKU HKUST SHENZHEN HONGKONG INSTITUTION
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