Bandwidth Extension of Telephone Speech Using a Neural Network and a Filter Bank Implementation for Highband Mel Spectrum

The limited audio bandwidth used in narrowband telephone systems degrades both the quality and the intelligibility of speech. This paper presents a new method for the bandwidth extension of telephone speech. Frequency components are added to the frequency band 4-8 kHz using only the information in t...

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Bibliographic Details
Published in:IEEE transactions on audio, speech, and language processing speech, and language processing, 2011-09, Vol.19 (7), p.2170-2183
Main Authors: Pulakka, H., Alku, P.
Format: Article
Language:English
Subjects:
Applied sciences
Artificial intelligence
Artificial neural networks
Band spectra
Bandwidth
Bandwidth extension
Computer science
control theory
systems
Connectionism. Neural networks
Detection, estimation, filtering, equalization, prediction
Exact sciences and technology
Excitation
Feature extraction
Filter banks
Frequency domain analysis
Indexes
Information, signal and communications theory
listening test
Narrowband
Neural networks
Signal and communications theory
Signal processing
Signal, noise
Spectrum allocation
Speech
speech enhancement
Speech processing
Studies
Telecommunications and information theory
Telephones
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Summary:The limited audio bandwidth used in narrowband telephone systems degrades both the quality and the intelligibility of speech. This paper presents a new method for the bandwidth extension of telephone speech. Frequency components are added to the frequency band 4-8 kHz using only the information in the narrowband speech. A neural network is used to estimate the mel spectrum in the extension band in short time frames based on features calculated from the narrowband speech. A wideband excitation signal is generated by spectral folding from the narrowband linear prediction residual and a filter bank is utilized to divide the excitation into four sub-bands that cover the extension band. These sub-bands are weighted such that the estimated mel spectrum is realized. Bandwidth-extended speech is obtained by summing the weighted sub-bands and the original narrowband signal. Listening tests show that this new method improves speech quality compared with narrowband telephone speech and with a previously published bandwidth extension method.
ISSN:1558-7916
2329-9290
1558-7924
2329-9304
DOI:10.1109/TASL.2011.2118206