| 摘要 |
PROBLEM TO BE SOLVED: To pick up sound from an utterance person certainly without being influenced by sneak sound. SOLUTION: A level ratio calculation circuit 194 calculates the average signal level data Eav of signal level data E11-E14 and E21-E24 corresponding to respective sound pickup beam signals, and then calculates the level ratios CE11-CE14 and CE21-CE24 of respective signal level data E11-E14 and E21-E24 and the average signal level data Eav. Since the sneak sound is substantially equivalent for all signal level data E, the sneak sound component of the average signal level data Eav also becomes substantially equivalent. On the other hand, the sound picked up from the utterance person is inherent to the signal level data of a corresponding sound pickup beam signal. Consequently, the part corresponding to the sneak sound is flat in the level ratios CE11-CE14 and CE21-CE24 and the data level becomes high locally only at the part corresponding to the sound picked-up. The sound pickup beam signal including the sound picked-up is detected by utilizing it. COPYRIGHT: (C)2008,JPO&INPIT
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