Abstract
Contact microphones are accelerometers placed on the skin to detect body-conducted speech, which is inherently robust to interfering sound sources. However, contact microphones are severely bandlimited. In contrast, standard air-conduction microphones capture all relevant frequencies from all sources. To partially recover lost frequency components of speech, we can use bandwidth extension, which uses formant information at low frequencies to reconstruct the spectral envelope and harmonic structure. We use a suite of bandwidth extension methods to combine high SNR, low bandwidth audio with low SNR, full bandwidth audio for speech enhancement.
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