| 摘要 |
<p>An acoustic space including a sound output path (232), first and second sound input paths (233, 234) is formed in a main body casing (23) of an earphone microphone (1). Output sound from a speaker (21) propagates in the sound output path (232). Sound input to a first microphone (22a) propagates in the first sound input path (233) communicating with outside. Sound input to a second microphone (22b) propagates in the second sound input path (234). The sound output path (232) branches into one path communicating with the outside of the main body casing (23) and the other path communicating with the second sound input path (234). The earphone microphone (1) amplifies a sound signal output from at least one of the first and second microphone (22a, 22b) so as to input sound from a sound source outside the main body casing (23), and suppresses input of the output sound.</p> |
