发明名称 |
Data collection-transmission apparatus and data collection system |
摘要 |
A data collection system performs data transmission from a portable information collection-transmission unit 1 to a central data reception unit 7 over a telephone line 6. The information collection-transmission unit 1 has a terminal 2 which temporarily stores data and a unidirectional acoustic coupler 3 which converts the data held in said terminal 2 into binary codes of frequencies used for the transmission on the telephone line, and it sends the data over the telephone line 6. The data reception unit 7 has a modem 8 which converts the data signal on the telephone line into a usable digital data signal and a work station 9 which stores the output of the modem, and it is further provided with a voice synthesizer 10 which outputs a prescribed low-frequency audible signal to the telephone line 6 in response to the instruction from the work station 9. After a call from the data collection-transmission unit 1 has been established, the voice synthesizer responds to the instruction from the work station 9 and issues a low-frequency audible signal for the acknowledgement of call establishment to the data collection-transmission unit 1 so that data transmission is commenced.
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申请公布号 |
US5467475(A) |
申请公布日期 |
1995.11.14 |
申请号 |
US19940290308 |
申请日期 |
1994.08.12 |
申请人 |
HITACHI MAXELL, LTD.;HITACHI, LTD. |
发明人 |
TAKAHASHI, TAKEHIRO;DAITO, KAZUHIKO;KAWAOKA, AKIHIRO |
分类号 |
G06K17/00;H04M11/00;(IPC1-7):G06F17/40 |
主分类号 |
G06K17/00 |
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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