发明名称 |
Digital telephone trasmitter/receiver |
摘要 |
An acoustic pulse in size corresponding to the digit position of a digital signal pulse is generated by means of condenser speakers 261, 262,.. 26n, that are grouped electro acoustic transducer elements corresponding to each bit that forms a digital signal employed in a communication channel. Then, an electro acoustic D/A converter for synthesizing the pulse in a cavity 24 is composed. Further, this electro acoustic D/A converter is to be as a component, and an electro acoustic A/D converter is composed by additionally providing electric accessories as in the A/D converter comprising a general electric circuit. In this manner, a transmitter/receiver having a function for converting between an acoustic analog signal and a digital electric signal is composed. <IMAGE> |
申请公布号 |
EP1009144(A3) |
申请公布日期 |
2003.02.05 |
申请号 |
EP19990309836 |
申请日期 |
1999.12.07 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;RIKO, YASUHIRO |
发明人 |
YASUNO, YOSHINOBU;RIKO, YASUHIRO |
分类号 |
H04R25/00;H04B1/38;H04M1/00;H04M1/02;H04M1/253;H04M1/60;H04R1/00;H04R1/02 |
主分类号 |
H04R25/00 |
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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