Showing papers by "Yutaka Kaneda published in 1992"

Acoustic transfer function simulating method and simulator using the same

Abstract: A plurality of acoustic transfer functions for a plurality of sets of different positions of a loudspeaker and a microphone in an acoustic system are measured by an acoustic transfer function measuring part. The plurality of measured acoustic transfer functions are used to estimate poles of the acoustic system by a pole estimation part, and a fixed AR filter is provided with the estimated poles as fixed values. A variable MA filter is connected in series to the fixed AR filter and the acoustic transfer function of the acoustic system is simulated by the two filters. The filter coefficients of the variable MA filter are modified with a change in the acoustic transfer function of the acoustic system.

Modeling of a room transfer function using common acoustical poles

Abstract: A method for modeling a room transfer function (RTF) by using estimated common acoustical poles that correspond to resonance properties of a room is proposed. These poles are estimated as common values of the multiple RTFs corresponding to different source and receiver positions. This common-acoustical-pole and zero (CAPZ) model requires far fewer variable parameters to represent RTFs than conventional all-zero or pole/zero models. This model was applied to an acoustic echo canceller and to head-related transfer functions. At low frequencies, the acoustic echo canceller based on this model converges 1.5 times faster than the one based on the all-zero model. Head-related transfer functions that have resonance characteristics of the external ear are also successfully modeled by the proposed model. >

Method for simulating sound transfer characteristic

Abstract: PURPOSE:To achieve the decrease in amount of operations and the like by using a plurality of measured sound transfer characteristics, estimating the physical pole of a object acoustic system, using the estimated pole as the fixed amount, and simulating the sound transfer characteristics in the acoustic system. CONSTITUTION:A sound source 51 and a sound receiver 52 are arranged in a space 11 in a chamber which is an object. The sound transfer characteristic between the sound source 51 and the sound receiver 52 is measured with a sound-transfer-characteristic measuring part 53 using these parts. A plurality of the measured sound transfer characteristics are sent into a pole estimating part 54, and the physical pole is estimated based on the sound transfer characteristics. The pole which is estimated in the estimating part 54 beforehand is supplied into a fixed AR filter 55. The pole simulating operation of the actual sound transfer characteristics is performed with the filter 55 and a variable MA filter 56 which is provided at the front stage or the rear stage of the filter 55. When the unknown sound transfer characteristics are estimated and applied on a simulating apparatus, the number of parameters required for the estimation can be reduced, and the reduction in amount of operation and the improvement of the estimating speed can be achieved.