| abstract |
(57) [Abstract] [Purpose] To realize a mobile phone device that can suppress environmental sounds. Realize a mobile phone device that makes it difficult to guess the origin of a call. Realize a mobile phone device that makes it difficult for people to hear what is being called. This enhances the functionality and convenience of the mobile phone device or the like. [Structure] For example, a microphone MIC1 for inputting a voice of a speaker and an environmental sound is provided below the front side of a case CASE such as a mobile phone device, and a microphone MIC2 mainly inputting only the environmental sound is provided above the rear side thereof. In addition to the above, an arithmetic circuit is provided which substantially cancels out the environmental sound signal by phase-inverting and adding the environmental sound signal input via the microphone MIC2 to the input sound signal input via the microphone MIC1. In addition, an environmental sound memory that holds a plurality of different environmental sound signals is provided in a mobile phone device, etc., and an arbitrary environmental sound signal is selected from these, and an input in which the environmental sound signal of the transmission source is canceled by the arithmetic circuit Add to sound signal. |