The measurement of room impulse responses (RIRs) at multiple points is useful in most acoustic applications, such as sound field control. Recently, several methods have been proposed to estimate multiple RIRs. However, when using a small number of closely located microphones, the estimation accuracy degrades owing to the source directivity. In this study, we propose an RIR estimation method using a source radiation model based on the sparse equivalent source method (ESM). First, based on the sparse ESM, the source radiation was modeled in advance by the microphone array enclosing the sound source. Subsequently, the sound field, including the sound reflections, was modeled using the source radiation model based on the sparse ESM and the image source method. As observed from the simulation experiments, the estimation accuracy was improved at higher frequencies compared with the sparse ESM without the source radiation model.
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