Realization of Sound Reproduction in a Specified Region Based on Transfer Function Interpolation

摘要

In this paper, a multichannel sound reproduction system based on transfer function interpolation is developed. The system creates a directional sound field by weighting signals fed to the loudspeaker units. To calculate the weighting coefficients, the acoustic transfer functions between the input signal of each loudspeaker and the signal in the target zone should be measured in advance. Three types of interpolation techniques are investigated to relieve the workload of measurements for obtaining the acoustic transfer functions at the target points. Based on the Discrete Fourier Transform (DFT) interpolation, a sound reproduction system using loudspeaker array is realized and more than 20 dB is guaranteed for the side lobe suppression at the frequencies above 800 Hz.