Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Patent
1996-09-16
1997-10-14
Tran, Sinh
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Plural or compound reproducers
381183, 381189, 381154, 381 687, H04R 2500
Patent
active
056779640
ABSTRACT:
A safe earphone generally includes a housing, water-proof seal, speaker, ear cushion, upper lid and a loop-type retainer is removably attached to the housing. Wherein the speaker is disposed with the ear cushion and the water-proof seal by its upper and bottom sides within the speaker chamber of the housing. The upper side is enclosed by the upper lid. The loop-type retainer is attached to the sound directing tubes with its both ends. The housing is with/without an opening according to its application. As a result, the earphone made according to this invention can be divided into speech-type and music-type. The loop-type retainer can be readily enveloped onto the helix of the ear by its resilient property. When external force is applied to the loop-type retainer, the retainer may be readily deprived therefrom to protect the helix without being injured. This arrangement ensures a safe and comfortable wearing situation. The sound wave generated by speaker is transmitted via the loop-type retainer and going out from the opening (music-type). Then the woofer is enhanced and a stereo effect is achieved. The music quality is highly increased. On the other hand, the rearward sound wave may be degenerated within the loop-type retainer (speech-type) to decrease the negative resonating effect. The quality of voice is therefore upgraded. The information is clearly transmitted.
REFERENCES:
patent: 2513746 (1950-07-01), Rohr
patent: 4020297 (1977-04-01), Brodie
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