By Yoichi Ando

Professor Yoichi Ando, acoustic architectural fashion designer of the Kirishima foreign live performance corridor in Japan, offers a accomplished rational-scientific method of designing functionality areas. His concept relies on systematic psychoacoustical observations of spatial listening to and listener personal tastes, whose neuronal correlates are saw within the neurophysiology of the human mind. A correlation-based version of neuronal sign processing within the significant auditory procedure is proposed within which temporal sensations (pitch, timbre, loudness, period) are represented via an inner autocorrelation illustration, and spatial sensations (sound situation, measurement, diffuseness with regards to envelopment) are represented by way of an inner interaural crosscorrelation functionality. jointly those inner important auditory representations account for the fundamental auditory features which are suitable for hearing track and speech in indoor functionality areas. saw mental and neurophysiological commonalities among auditory and visible sensations and choice styles are offered and mentioned. This publication hence spans the disciplines of physics, acoustics, psychology, neurophysiology, and tune creation, thereby mixing technology, engineering, and art.

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The τIACC is the delay at which the IACF attains its maximum value of IACC. This interaural delay is associated with sound direction in the horizontal plane. 1*IACC). WIACC is associated with the apparent source width of the sound These four factors, LL, IACC, τIACC , and WIACC , are independently related to subjective preference (Chapter 3) and spatial sensations such as subjective diffuseness and the ASW (Chapter 7). 14), one can effectively replicate the sound field in a given enclosure by taking the directional information of the sound source and its reflections into consideration.

1 τe –5 –10 –15 0 200 100 Delay time τ [ms] The autocorrelation function (ACF) of any sinusoid (pure tone) having any phase is a zero-phase cosine of the same frequency. Since its waveform and ACF envelope is flat, with a slope of zero, its effective duration τe is infinite. The ACF of white noise with infinite bandwidth is the Dirac delta function δ(τ) which has an infinite slope. This means that the signal has an effective duration that approaches zero (no temporal coherence). As the bandwidth of the noise decreases, the effective duration (signal coherence) increases.

Thus, to preserve clarity, the first reflection time should not be substantially longer than the effective duration of the sound source. On the other hand, when the first reflection time is short, the interference of direct Fig. 1 Preferred Properties for Sound Fields with Multiple Reflections 29 and reflected sound in the coherent time region can produce tone coloration effects that are the result of periodicities in the pitch range that have been introduced. If the reflection times are very short, less than 1 ms, the delay can produce binaural effects that increase the interaural crosscorrelation magnitude (IACC), and thus decrease listening satisfaction.

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