Speech bandwidth extension using transform-domain data hiding

A new transform-domain speech bandwidth extension algorithm is proposed to transmit the information about the missing speech frequencies over a hidden channel, i.e., the related spectral envelope and gain parameters are hidden within the narrowband speech signal using fast Fourier transform-based data hiding technique. The hidden information is recovered reliably at the receiving end to produce a wideband signal of much higher quality. Obtained results confirm that the excellent reconstructed wideband (RWB) signal quality of the proposed algorithm over the traditional methods.