Csaba Huszty

• PhD
• CEO at Entel Engineering Research & Consulting Ltd.

In numerical room acoustic modeling certain material properties are required as inputs for setting the boundary conditions for the calculations. In finite element or finite difference models, locally reactive boundaries are often represented as FIR or IIR filters. However, most building material manufacturers provide sound absorption coefficient or...

Modeling of layered acoustic structures to predict the sound absorption characteristics of complex materials is a widely used method in room acoustic practice. Commonly used modeling techniques-such as the transfer matrix method-typically assume locally reacting surfaces of infinite lateral dimensions and provide one-dimensional calculations only,...

The measurement of surface impedance and the absorp-tion/transmission characteristics is well-established for acoustic materials that can be considered locally reac-tive: Impedance tube-based and in-situ measurement techniques are codified in multiple ISO standards, e.g. ISO 354 and ISO 10534. However, as lateral wave propagation in the material un...

Ambisonics is a well-established technique for capturing, storing and reproducing spatial sound. B-format refers to a commonly established first order Ambisonics audio storage format, frequently used in 3D spatial audio applications due to the widespread availability of supporting recording hardware and panning strategies. However, modern multichan...

In room acoustic design, it is common to use computer modeling to evaluate different options and scenarios. The process of defining the optimum shapes and locations of various acoustic elements, such as reflectors, diffusers or absorptive materials, or the design of material properties often involve multiple manual iterations. In many cases, this c...

Various decay function and decay time estimation methods show different performance properties in terms of accuracy, reliability, convenience in use and ease of implementation. In this paper a systematic way for evaluating and comparing decay function estimation methods is presented. The method is based on decay models. Commonly used monoexponentia...

The signal-to-noise ratio (SNR) of room impulse responses (RIR) and its calculation are subjects of continuous interest in room acoustic measurements. The determination of the SNR of a noisy signal depends on the purpose and definition, but it is commonly accepted in engineering applications that the SNR is a ratio of average powers, represented by...

In this paper a generalized measure in the form of a function for a given room impulse response (RIR) is presented and examined with the goal to predict or approximate established room acoustic parameters. Theoretical assumptions for a diffuse space as well as a measurement database are used to formulate and verify the prediction methods. The corre...

A study was conducted to demonstrate hyperbolic sweep signals for architectural acoustic measurements. A new range of time-domain generated sine sweeps was presented with hyperbolic modulation functions, capable of focusing and notching at a given frequency in a controllable way. The direct generating equations of four hyperbolic signals had been d...

This paper presents the application and a method that calculates the reverberation time based on Lp-norms. generalized measures of the room impulse response (RIR). without using regression on decay curves. The reverberation time in this approach is a function of a parameter, and is constant only in a perfectly diffuse space; therefore the method ma...

This paper proposes new types of time-domain generated sine sweeps for impulse response measurements. A general time-domain analytical formulation method, combined with numeric phase alignment and frequency-domain inverse filtering is presented. It is applied to derive three new families of controllable spectrum sine sweeps called sweeplets, capabl...

The application of room impulse response (RIR) measurements in auralization and convolution reverberation requires algorithms to modify several objective parameters in order to allow subjective tests or to meet the creative needs of sound designers and engineers. In contrast to synthetic techniques where the impulse response is a result of setting...

Room acoustic evaluation is usually based on post-processing of measured room impulse responses (RIRs), and this often requires some kind of filtering, for instance to derive fractional octave band parameters of a room. In this paper it is shown that the considerable variance of room acoustic parameters of almost any hall is partly caused by the fi...

Application of room impulse responses (RIRs) to acoustic evaluation and auralization often requires many measurements to get enough information about the hall, or to provide enough flexibility for virtual sound source placements in convolution reverberation. In this paper we propose a measurement-based fuzzy modeling method to approximate the RIR f...