Hotehama Takuya, Nakagawa Seiji
Japan Society for the Promotion of Science, National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan.
J Acoust Soc Am. 2010 Nov;128(5):3011-8. doi: 10.1121/1.3493421.
Ultrasonic vibration generates a sensation of sound via bone-conduction. This phenomenon is called bone-conducted ultrasonic (BCU) hearing. Complex sounds can also be perceived by amplitude-modulating a BCU stimulus (AM-BCU). The influence of the modulation frequency on the sensitivity to detecting amplitude modulation of sinusoidal carriers of 10, 20, and 30 kHz was examined to clarify the characteristics of the perception of amplitude modulation over the sonic or audio-frequency range and the ultrasonic range. In addition, the detection sensitivity for single-sideband modulation for a 20 kHz carrier was measured. Temporal modulation transfer functions (TMTFs) obtained at each carrier frequency suggest that the auditory system has the ability to process timing information in the envelopes of AM-BCUs at lower modulation frequencies, as is the case with audio-frequency sounds. The possible influence of peripheral filtering on the shape of the TMTF at higher frequencies was examined.
超声振动通过骨传导产生声音感觉。这种现象被称为骨传导超声（BCU）听力。复杂声音也可以通过对BCU刺激进行幅度调制（AM-BCU）来感知。研究了调制频率对检测10、20和30kHz正弦载波幅度调制灵敏度的影响，以阐明在声音或音频频率范围以及超声范围内幅度调制感知的特征。此外，还测量了20kHz载波单边带调制的检测灵敏度。在每个载波频率下获得的时间调制传递函数（TMTF）表明，听觉系统有能力在较低调制频率下处理AM-BCU包络中的时间信息，就像音频声音一样。研究了高频时外周滤波对TMTF形状的可能影响。
