Frequency characteristics of several non-audible murmur (NAM) microphones
نویسندگان
چکیده
منابع مشابه
Remodeling of the sensor for non-audible murmur (NAM)
We developed the next generation of skin-attachment sensors for sampling NAM (Non-Audible Murmur) signals by using soft silicone, which has an acoustic impedance close to that of human flesh, as the prime medium of vibration. With new NAM microphones we could sample expanded target voice signal, suppressing air conduction noise signal to low by the experiment of synchronous stereo sampling of a...
متن کاملNon-audible murmur (NAM) speech recognition using a stethoscopic NAM microphone
In this paper, we introduce the Stethoscopic Non-Audible Murmur (NAM) microphone, and we focus on its application in automatic speech recognition systems. The NAM microphone is attached behind the talker’s ear, and can capture very quietly uttered murmur (NAM speech). It is applicable in automatic speech recognition systems, when privacy is important in human-machine communication. Moreover, si...
متن کاملInvestigating the role of the Lombard reflex in non-audible murmur (NAM) recognition
In this paper, we report non-audible murmur (NAM) recognition results in noisy environments and investigate the effect of the Lombard reflex on non-audible murmur recognition. Non-Audible murmur is speech uttered very quietly and captured through body tissue by a special acoustic sensor (e.g., NAMmicrophone). A system based on non-audible murmur recognition can be applied in cases when privacy ...
متن کاملSpeaker verification with non-audible murmur segments
We propose a speaker verification method using non-audible murmur (NAM) segments, which are different from normal speech and hard for other people to catch them. To use NAM, we therefore take a text-dependent verification strategy in which each user utters her/his own keyword phrase and utilize not only speaker-specific but also keyword-specific acoustic information. We expect this strategy to ...
متن کاملNon-audible murmur enhancement based on statistical conversion using air- and body-conductive microphones in noisy environments
Non-Audible Murmur (NAM) is an extremely soft whispered voice detected by a special body-conductive microphone called a NAM microphone. Although NAM is a promising medium for silent speech communication, its quality is significantly degraded by its faint volume and spectral changes caused by body-conductive recording. To improve the quality of NAM, several enhancement methods based on statistic...
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ژورنال
عنوان ژورنال: Acoustical Science and Technology
سال: 2009
ISSN: 1346-3969,1347-5177
DOI: 10.1250/ast.30.139