Data collection-transmission apparatus and data collection syste

Details Data collection-transmission apparatus and data collection syste Data collection-transmission apparatus and data collection syste

1994-08-12

1995-11-14

Eng, David Y.

Boots, shoes, and leggings

364946, 3649194, 364920, 3642223, G06F 1740

Patent

active

054674751

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.

REFERENCES:
patent: 3805234 (1974-04-01), Masters
patent: 3995258 (1976-11-01), Barlow
patent: 4090247 (1978-05-01), Martin
patent: 4368519 (1983-01-01), Kennedy
patent: 4446462 (1984-05-01), Onellette
patent: 4503288 (1985-03-01), Kessler
patent: 4759052 (1988-07-01), Hashimoto
patent: 4905186 (1990-02-01), Fukui
patent: 4953113 (1990-08-01), Chadima

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