The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 14, 1995
Filed:
Aug. 12, 1994
Hitachi Maxell, Ltd., Osaka, JP;
Hitachi, Ltd., Tokyo, JP;
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.