scholarly journals The influence of frequency and amplitude modulation due to the sound source movement on radiated sound characteristics

2021 ◽  
Author(s):  
Yusuke MAKINO ◽  
Yasushi TAKANO
Keyword(s):  
Sound Source ◽  
Amplitude Modulation ◽  
Sound Source Movement ◽  
Radiated Sound

scholarly journals Early multisensory integration of self and source motion in the auditory system

2016 ◽  
Vol 113 (29) ◽  
pp. 8308-8313 ◽  
Author(s):  
Eyal Wigderson ◽  
Israel Nelken ◽  
Yosef Yarom
Keyword(s):  
Auditory System ◽  
Sound Source ◽  
Sensory Information ◽  
Dorsal Cochlear Nucleus ◽  
Head Direction ◽  
Sound Stimulation ◽  
Sound Source Movement ◽  
To Receive ◽  
The Brain ◽  
Source Motion

Discriminating external from self-produced sensory inputs is a major challenge for brains. In the auditory system, sound localization must account for movements of the head and ears, a computation likely to involve multimodal integration. Principal neurons (PNs) of the dorsal cochlear nucleus (DCN) are known to be spatially selective and to receive multimodal sensory information. We studied the responses of PNs to body rotation with or without sound stimulation, as well as to sound source rotation with stationary body. We demonstrated that PNs are sensitive to head direction, and, in the presence of sound, they differentiate between body and sound source movement. Thus, the output of the DCN provides the brain with enough information to disambiguate the movement of a sound source from an acoustically identical relative movement produced by motion of the animal.

Effect of sound source movement at low Mach number on radiated noise level

2021 ◽  
Vol 263 (3) ◽  
pp. 3731-3737
Author(s):  
Yusuke Makino ◽  
Yasushi Takano
Keyword(s):  
Mach Number ◽  
Sound Source ◽  
Noise Level ◽  
Power Level ◽  
Sound Field ◽  
Dominant Frequency ◽  
Sound Level ◽  
Low Mach Number ◽  
Radiated Sound ◽  
The Difference

Change in A-weighted sound pressure level or Noise level of radiated sound due to sound sources moving at low Mach number at the same speed along a straight track is discussed in this paper. When a sound source move, frequency and amplitude modulation is observed in the radiated sound field. Without their modulation, the noise level at a receiving point is determined only by distance and A-weighted sound power level of each sources. Solution of modulated frequency and amplitude of radiated sound can be obtained by using the Duhamel's efficient calculation. The modulated frequency and amplitude increase for approaching sources and decrease for receding sources. The difference of maximum noise level,and the equivalent sound level during the sources passing-by, with or without considering the modulation, increases monotonically with respect to source velocity, and independent of distance from the track. This difference increases as dominant frequency band of the sources decreases due to A-weighting below 1 kHz.

Auditory cortical neurons in the cat sensitive to the direction of sound source movement

1974 ◽  
Vol 73 (3) ◽  
pp. 455-471 ◽  
Author(s):  
Anssi R.A. Sovija¨rvi ◽  
Juhani Hyva¨rinen
Keyword(s):  
Sound Source ◽  
Cortical Neurons ◽  
Sound Source Movement
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