Patent ID: 8879749

Claim:
A directional microphone apparatus comprising: a plurality of non-directional microphone units; a correction processor configured to correct a plurality of signals obtained by the plurality of non-directional microphone units by using a correction parameter; a directivity synthesizer configured to perform directivity synthesis by using the plurality of signals corrected; a level difference calculator configured to calculate a level difference between the plurality of non-directional microphone units; and a correction parameter calculator configured to calculate the correction parameter based on the level difference, the correction parameter for correcting simultaneously the level difference and a phase difference in the plurality of non-directional microphone units in the correction processor, wherein the correction parameter calculator determines a first non-directional microphone unit having a lower level in a low band among the plurality of non-directional microphone units based on the level difference calculated by the level difference calculator, and calculates a filter coefficient having an inverse characteristic of a digital filter, the digital filter corresponding to the first non-directional microphone unit, and the correction processor corrects a first signal obtained by the first non-directional microphone unit by multiplying the first signal by the filter coefficient calculated by the correction parameter calculator.