| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an inexpensive earphone microphone that can be miniaturized and has an echo suppression function.SOLUTION: An earphone microphone includes: one speaker 21; first and second microphones 22a, 22b; a body housing 23 forming an acoustic space; and an output control unit for amplifying a sound signal to be output from at least one of the first and second microphones. The acoustic space includes a sound emission passage 232, a first sound collection passage 233, and a second sound collection passage 234. The output sound of the speaker is propagated in the sound emission passage. The first sound collection passage communicates with the outside of the body housing. Sound to be input to the first microphone is propagated in the first sound collection passage. Sound to be input to the second microphone is propagated in the second sound collection passage. The sound emission passage is branched into one route communicating with the outside of the body housing and the other route communicating with the second sound collection passage. The earphone microphone amplifies a sound signal, to thereby collect input sound from the external sound source of the body housing and suppress the collection of the output sound of the speaker.</p> |
