Apparatus for expanding narrowband speech to wideband speech by

Details Apparatus for expanding narrowband speech to wideband speech by Apparatus for expanding narrowband speech to wideband speech by

1998-09-21

1999-11-02

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, 704500, G10L 302

Patent

active

059787597

ABSTRACT:
Apparatus for expanding the bandwidth of speech signals such that a narrowband speech signal is input and digitized, the spectral envelope information and residual information are extracted from the digitized signal by linear predictive coding analysis, the spectral envelope information is expanded into wideband information by a spectral envelope converter, the residual information is expanded into wideband information by a residual converter, the converted spectral envelope information and residual information are combined to produce a wideband speech signal, frequency information not contained in the input signal is extracted from the obtained wideband speech signal by a filter, and the resulting signal is added to the original digitized input signal, and the obtained signal is converted into an analog signal as the output signal of the apparatus. The apparatus comprises a linear mapping function codebook used for converting spectral parameters, and a weights calculator and an adder for weighing and summing function outputs.

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Yuki Yoshida and Masanobu Abe, An Algorithm to Reconstruct Wideband Speech from Narrowband Speech Based on Codebook Mapping, Oct. 9, 1994, pp. 1591-1594, ICSLP 94, Yokohama.
Carl Holger and Ulrich Heute, Bandwidth Enchancement of Narrow-Band Speech Signals, 1994, pp. 1178-1181, Signal Processing VII Theories and Applications Proceedings of EUSIPCO-90 Seventh European Signal Processing Conference.
Lawrence Rabiner and Biing-Hwang Juang, Fundamentals of Speech Recognition, 1993, pp. 72-77, Prentice Hall.
Lawrence R. Rabiner and Ronald W. Schafer, Digital Processing of Speech Signals, 1978, pp. 18-23 and 440-445, Prentice Hall.
Yan Ming Cheng et al., Statistical Recovery of Wideband Speech from Narrowband Speech, Oct. 1994, pp. 544-548, IEEE Transactions on Speech and Audio Processing, vol. 2, No. 4.

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