| 摘要 |
PURPOSE:To form plural microphones with a directivity without frequency dependency whose sound recording range is variable by means of one fan filter by using the fan filter in common for plural microphone array sections. CONSTITUTION:The equipment is provided with 1st and 2nd microphone arrays 15, 25 each comprising N sets of microphone units arranged in a line and a signal synthesis means 35 adding outputs of m-th microphone units of both microphones and outputting the result. An output of the synthesis means 35 is subject to 2-dimension digital filtering by a fan filter 40. Then a sampling frequency control means 50 to change the sampling frequency of the fan filter 40 is provided. Thus, plural microphones with a directivity without frequency dependency whose sound recording range is variable are formed by one fan filter. |
