发明公开
- 专利标题： 지하철 동영상 광고 청취용 단방향 디지털 무선 이어폰
- 专利标题（英）： One-way digital radio receiver for listening to moving picture advertizement of subway train
- 专利标题（中）： 用于监听地下移动广告图像的无线数字无线耳机，涉及在减少信号错误时增加接收速度
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申请号： KR1020030019769申请日： 2003-03-29
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公开(公告)号： KR1020040084589A公开(公告)日： 2004-10-06
- 发明人: 정홍면
- 申请人： (주)사이버트리 , 정홍면
- 申请人地址： 인천광역시 부평구 안남로***번길 ** (청천동)
- 专利权人： (주)사이버트리,정홍면
- 当前专利权人： (주)사이버트리,정홍면
- 当前专利权人地址： 인천광역시 부평구 안남로***번길 ** (청천동)
- 代理商 황성택
- 主分类号： H04B1/06
- IPC分类号： H04B1/06
摘要：
PURPOSE: A unilateral digital wireless earphone for listening to a subway moving advertisement image is provided to receive a weak propagation at less than 300MHz to convert into a digital signal, and to restore the digital signal to a voice signal. CONSTITUTION: A receiving antenna(110) receives a transmission signal transmitted from a transmitter(200). A band pass filter(120) filters a weak propagation signal band at less than 300MHz. A signal amplifier(130) amplifies an RF signal of the corresponding band. A frequency modulator(140) restores the amplified RF signal to a compressed digital signal. A restorer(150) restores the compressed digital signal to a normal digital signal. A D/A converter(160) modulates the normal digital signal into an analog signal. A low pass filter(170) removes a high band signal from the analog signal. A power amplifier(180) amplifies the signal passing through the low pass filter(170). A speaker(190) changes the signal into a voice signal.
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