The reproduction of acoustics is an important aspect of the preservation of cultural heritage. A common approach is to capture an impulse response in a hall and auralize it by convolving an input signal with the measured reverberant response. For immersive applications, it is typical to acquire spatial impulse responses using a spherical microphone array to capture the reverberant sound field. While this allows a listener to freely rotate their head from the captured location during reproduction, delicate considerations must be made to allow a full six degrees of freedom auralization. Furthermore, the computational cost of convolution with a high-order Ambisonics impulse response remains prohibitively expensive for current real-time applications, where most of the resources are dedicated towards rendering graphics. For this reason, simplifications are often made in the reproduction of reverberation, such as using a uniform decay around the listener. However, recent work has highlighted the importance of directional characteristics in the late reverberant sound field and more efficient reproduction methods have been developed. In this article, we propose a framework that extracts directional decay properties from a set of captured spatial impulse responses to characterize a directional feedback delay network. For this purpose, a data set was acquired in the main auditorium of the Finnish National Opera and Ballet in Helsinki from multiple source-listener positions, in order to analyze the anisotropic characteristics of this auditorium and illustrate the proposed reproduction framework.
翻译:声音复制是保存文化遗产的一个重要方面。 一种共同的方法是在大厅中捕捉脉冲反应,通过使用有节制反动反应的输入信号,使厅室具有振动反应力,使厅室具有振动反应力。 静默应用通常使用球形麦克风阵列获得空间脉冲反应,以捕捉回动声场。 虽然这样可以让听众在复制过程中将头部与所捕捉的位置自由旋转,但必须谨慎考虑允许完全的六度自由振动。 此外,对于当前实时应用程序,大部分资源都专门用于显示图形的磁力反应,其计算成本仍然过于昂贵。 因此,在复制复制过程中,通常会简化空间脉冲反应的复制,如在听众周围使用统一的腐蚀。 然而,最近的工作突出了方向性特征在晚回动声场中的重要性,并开发了更高效的复制方法。 此外,我们提议了一个框架,将方向衰减特性从一组已捕获的空间脉冲反应反应到当前实时应用程序中,大多数资源都用于显示图形。 为此,在复制工作的复制过程中,将这一结构结构中,将显示一个方向的多层分析网络。