Data collection-transmission apparatus and data collection system
US5467475A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 12, 1994 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | Aug 12, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K17/0022
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.