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This letter proposes a bandwidth extension (BWE) method using the cepstral envelope coding and duplication of quantized wideband (WB) signals by means of analysis -by-synthesis (AbS) for super-wideband (SWB) coders. In the proposed method, a high frequency band is generated by utilizing the quantized cepstral coefficients extracted from the envelope and the quantized modified discrete cosine transform...
In this paper, an efficient noise reduction algorithm is proposed for robust speech recognition. For the nonstationary noise reduction, frequency-domain beamforming-based speech enhancement is performed and masking-based Wiener filter is applied to the beamforming output. To design the masking-based Wiener filter, the spectrum of beamforming output is classified into noise spectrum and speech spectrum...
In this paper, a new algorithm for encoding spectral envelope in G.729.1 for VoIP is proposed. In the TDAC part of G.729.1, the spectral envelope and MDCT coefficients extracted in the weighted CELP coding error (lower-band) and the higher-band input signal are encoded. In order to reduce allocation bits for spectral envelope coding, a new algorithm using sub-band correlation between adjacent frames...
In this paper, a new algorithm for encoding spectral envelope in G.729.1 for VoIP is proposed. In order to reduce allocation bits, sub-band correlation between adjacent frames is utilized. By the proposed allocation algorithm, enhanced quality of sounds can be obtained even in frame error conditions.
In this paper, a new decision rule for the frame-by-frame classification of speech and music signals is proposed. Based on the signal kurtosis and skewness, a binary decision tree is constructed by the classification and regression tree algorithm. By the speech quality tests in G.718 speech/audio coder, the superiority of the proposed algorithm is confirmed.
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