Transmitting and receiving earphone set for use with cellular telephone, has one microphone attached in front of loudspeaker to receive ambient sound, and another microphone in housing at distance from speaker to receive user speech

摘要

The earphone set has a loud speaker attached in a housing behind a grid, which covers a front side of the housing, where the speaker is adjusted to a rearside of the housing. A microphone (13) is attached within a retaining space of hub in the grid in front of the speaker. The microphone is arranged on an axial central through-hole of the hub for receiving resonant ambient sound from external hearing channel of a user ear. Another microphone (14) is attached within the housing at a distance from the loudspeaker for receiving speech and vocal sound of the user.