Statistical recovery of wideband speech from narrowband speech

We present an algorithm to generate wideband speech from a narrow band version of the same. The main body of the algorithm is a statistical recovery function (SRF), which predicts the highband spectrum based solely on the narrowband spectrum. The performance of the algorithm has been measured both in terms of spectral distortion and spectral signal-to-noise ratio (SNR). We obtained a 3 dB gain in SNR for the reconstructed wideband speech as compared to the narrowband speech.>