| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sound pickup unit which accurately detect a rising sound when voiceless compression is performed and never clips a loud sound even when the loud sound is inputted during a rise. <P>SOLUTION: An A/D converter 23 sets sound pickup signals S1, S3, S5, and S7 in low sensitivity and inputs them to a pickup beam generator 25B. The A/D converter 23 sets sound pickup signals S2, S4, S6, and S8 in high sensitivity and inputs them to the pickup beam generator 25B. A speech detector 27 decides whether a speech is voiced or voiceless from a pickup beam, and decides whether the speech is clipped. A control unit 28 inputs the decision results of the speech detector 27, and sets an encoder 29 so that when a high-level pickup beam signal MB1 is clipped, a low-level pickup beam signal MB2 is outputted to the outside. <P>COPYRIGHT: (C)2008,JPO&INPIT |
