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In this paper, we present the use of stethoscope and silicon NAM microphones in automatic speech recognition. NAM microphones are special acoustic sensors, which are attached behind the talker's ear and can capture not only normal (audible) speech, but also very quietly uttered speech (non-audible murmur). As a result, NAM microphones can be applied in automatic speech recognition systems when privacy is desired. Previously, we presented speech recognition experiments for non-audible murmurdoi:10.21437/interspeech.2005-149 fatcat:seswup5jgrhdfl6auofji4y774