| 摘要 |
A muting device includes an external sound input unit that receives an external sound and an internal sound input unit that only receives an internal sound. The external sound received by the external sound input unit has a component, which corresponds to the internal sound received by the internal sound input unit, removed therefrom. Only when the signal level of a specific kind of external sound sampled from the external sound having the internal sound component thereof removed therefrom is equal to or larger than a certain signal level, the internal sound is automatically muted. Consequently, there is provided a muting device that autonomously and accurately mutes an internal audio output responsively to a specific external sound such as a telephone ring while being unaffected by an internal sound. |
