This study investigates a band extension technique for speech data encoded with G.711, the most common codec for digital speech communications systems such as VoIP. The proposed technique employs steganography for the transmission of the side information required for the band extension based on full wave rectification. Due to the steganography, the proposed technique is able to enhance the speech quality without an increase of the amount of data transmission. From the results of a subjective evaluation, it is indicated that the proposed technique may potentially be useful for improving the speech quality, compared with the conventional technique.
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