Abstract
The room transfer function (RTF) between the sound source and the evaluation point changes significantly according to their positions because of reflection. Therefore, the easy method to interpolate RTF at an arbitrary point with high precision must be developed. In this paper, a new method to interpolate RTF at an arbitrary point from the measured values at several points is proposed. The impulse response of RTF can be divided into the direct sound, early-reflected sounds and reverb sound. By closely located four point microphone method, the imaginary sound sources (ISS) of the early-reflected sounds at the measurement points are identified. The transfer function of early-reflected sounds at an arbitrary point can be interpolated from the identified ISSs. The transfer function of reverb sound at an arbitrary point can be interpolated linearly. The experiment in an office room showed that the interpolated value of RTF at an arbitrary point agreed with the measured value to some degree.
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