发明名称 |
OPTICAL WIRELESS RECEIVER |
摘要 |
<P>PROBLEM TO BE SOLVED: To adjust a sound volume without having effects on frequency characteristics of reproduced sound. <P>SOLUTION: An optical wireless receiver includes: a light receiving section for receiving a sound digital optical signal (pulse compression wave) resulting from applying 1-bit quantization processing to a sound analog signal and being transmitted; a filter circuit for converting the 1-bit quantization signal photoelectric-converted by the light receiving section into a sound analog signal; and a speaker for transducing the sound analog signal into sound, is provided with: a sound volume setting section for setting a sound volume setting signal for setting a sound volume of the speaker; and a pulse amplitude adjustment section for adjusting the pulse amplitude of the 1-bit quantization signal output from the light receiving section in response to the sound volume setting signal and outputting the adjusted result to the filter circuit. <P>COPYRIGHT: (C)2007,JPO&INPIT |
申请公布号 |
JP2006295456(A) |
申请公布日期 |
2006.10.26 |
申请号 |
JP20050112151 |
申请日期 |
2005.04.08 |
申请人 |
NIPPON TELEGR & TELEPH CORP <NTT> |
发明人 |
YASUDA YOSHIYUKI |
分类号 |
H04B10/11;H04B10/114;H04B10/40;H04B10/50;H04B10/524;H04B10/564;H04B10/60;H04B10/69 |
主分类号 |
H04B10/11 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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