| 摘要 |
PURPOSE: To correctly detect a speech signal among signals buried in noises by judging that there is the speech signals among the signals affected by the noises when the maximum energy or energy ratio of digital signals passed through filters is larger than its maximum threshold value. CONSTITUTION: The filter 44 and an energy calculation device 45 provide a parameter Xph and an energy calculation device 46 provides a parameter X; and the parameters X and Xph are applied to the 1st operand input and 2nd operand input of a divider 47 respectively to calculate a parameter R. Then when the maximum energy or energy ratio R of the digital signals passed through filters 43 and 44 is larger than its maximum threshold value, it is judged that there is the speech signal among the signals affected by noises. Consequently, the speech signal among the signals buried in the noises can correctly be detected. |
