| 摘要 |
PROBLEM TO BE SOLVED: To effectively utilize memory resources by reducing the holding number of filter character information of a NC (noise canceling) filter when different NC modes are set so as to be variable, and to reduce user's sense of incongruity due to the change of sound quality when the NC mode is switched. SOLUTION: Filter processing is individually performed by entering a sound collection signal by a microphone, and each filter processing output is combined with a required combination ratio. Thereby, as an intermediate signal characteristic by multiplication of the plurality of filter characteristics is given to the sound collection signal, it is not required that the filter characteristic is related to the NC mode one by one, as in the prior art. Moreover, when the combination ratio is changed with time, sudden change of sound quality is prevented, and user's sense of incongruity is reduced. COPYRIGHT: (C)2010,JPO&INPIT |
