Manuscript received September 21, 1998. Manuscript revised January 6, 1999. † The authors are with Chiba Institute of Technology, Narashino-shi, 275-0016 Japan. †† The author is with Kogakuin University, Hachiouji-shi, 1920015 Japan. SUMMARY This paper proposes a method of improving the accuracy of the attenuation constant estimate obtained by using the crossspectral technique. In the cross-spe...

In this paper, the problem of modeling head-related transfer functions (HRTFs) is addressed. Traditionally, HRTFs are approximated in real-time applications using minimum-phase reconstruction and various digital lter design techniques, yielding FIR or IIR structures. In this work, binaural auditory modeling has been applied to HRTF analysis and lter design methods have been compared from the au...

In real-world applications high-order IIR filters are often converted to series or parallel second-order sections to decrease the negative effects of coefficient truncation and roundoff noise. While series biquads are more common, the parallel structure is gaining more interest due to the possibility of full code parallelization. In addition, it is relatively simple to design a filter directly ...

This paper presents the methodology for the design of Low pass FIR digital filter using hybrid Differential Evolution (DE) method. It is an evolutionary algorithm that exhibits the features of both the basic DE and HookeJeeves exploratory move to attain the optimal solution. The basic DE and exploratory move have the capability to exploit and explore the search space to design the optimal filte...

It is a challenging task to design orthogonal filter banks, especially multidimensional (MD) ones. In the onedimensional (1D) two-channel finite impulse response (FIR) filter bank case, several design methods exist. Among them, designs based on spectral factorizations (by Smith and Barnwell) and designs based on lattice factorizations (by Vaidyanathan and Hoang) are the most effective and widel...

This paper 1 presents a direct design technique for parallel second-order sections based on a perceptually motivated logarithmic scale, with application to instrument body modeling. Traditional FIR and IIR design techniques work on a linear frequency scale, which is usually not optimal for audio applications. Warped filters and Kautz filters are good candidates for perceptually motivated filter...

We propose a novel framework for a new class of two-channel biorthogonal filter banks. The framework covers two useful subclasses: i) causal stable IIR filter banks ii) linear phase FIR filter banks. There exists a very effcient structurally perfect reconstruction implementation for such a class. Filter banks of high frequency selectivity can be achieved by using the proposed framework with low...

This paper proposes an efficient compensation method using a first-order approximation of time axis scaling for the variations of the room acoustic transfer function. The time axis scaling model is based on the fact that the change of the sound velocity due to the change of room temperature is a dominant factor for the variations of room impulse response affected by environmental conditions. In...

In this article we propose a structured IIR model for HRTF filters that can be applied to multi-user binaural soundscape rendering of virtual sound sources moving continuously in 3D space. A motivation for using low-order IIR models in HRTF interpolation is to trade some reasonable amount of soundscape fidelity for computational performance. Two strategies for interpolation of these IIRmodels a...

The ideal sinc filter, ignoring the noise statistics, is often applied for generating an arbitrary sample of a bandlimited signal by using the uniformly sampled data. In this article, an optimal interpolator is proposed; it reaches a minimum mean square error (MMSE) at its output in the presence of noise. The resulting interpolator is thus a Wiener filter, and both the optimal infinite impulse ...