| 摘要 |
<p>An earphone microphone includes a main body housing, a differential microphone, and a speaker. The main body housing defines first and second acoustic spaces therewithin. The main body housing has a first opening that communicates the first acoustic space with an outside of the main body housing and a second opening that communicates the second acoustic space with the outside of the main body housing. The second acoustic space forms a Helmholtz resonator relative to sound propagating through the second opening. The differential microphone has first and second sound collection holes. The first and second sound collection holes communicate with the first and second acoustic spaces, respectively. The speaker is disposed in the second acoustic space.</p> |
