音場のアンビソニックス表現を生成するために使われる剛体球上の球状マイクロホン・アレイの信号を処理する方法および装置

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专利权人:

ドルビー・インターナショナル・アーベー

发明人:

コルドン，スベン,バトケ，ヨハン−マルクス,クルーガー，アレクサンダー

申请号：

JP20140540396

公开号：

JP6113739(B2)

申请日:

2012.10.31

申请国别(地区):

日本

年份:

2017

代理人:

摘要：

Spherical microphone arrays capture a three-dimensional sound field ( P ( © c , t )) for generating an Ambisonics representation A n m t , where the pressure distribution on the surface of the sphere is sampled by the capsules of the array. The impact of the microphones on the captured sound field is removed using the inverse microphone transfer function. The equalisation of the transfer function of the microphone array is a big problem because the reciprocal of the transfer function causes high gains for small values in the transfer function and these small values are affected by transducer noise. The invention estimates (73) the signal-to-noise ratio between the average sound field power and the noise power from the microphone array capsules, computes (74) the average spatial signal power at the point of origin for a diffuse sound field, and designs in the frequency domain the frequency response of the equalisation filter from the square root of the fraction of a given reference power and

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中国工程科技知识中心

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http://www.ckcest.cn/home/