Data transmission and storage

Details Data transmission and storage Data transmission and storage

1990-01-08

1991-08-06

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379104, H04M 1100

Patent

active

050383744

ABSTRACT:
A sequence of data groups are modulated at a central location and coupled to a telephone line in response to a call-up signal. The sequence is transmitted through the telephone lines to a remote computer. The computer receives the signals, demodulates them, and couples them to a moemory. The data is stored at a particular address, and in coupling the data to the memory, the computer checks a flag at that address to determine whether the data has already been written over. When the flags indicate that the data received corresponds to data already written over, it signals the end of a transmission. The data stored in the memory can be accessed by an operator using input controls.

REFERENCES:
patent: 4253157 (1981-02-01), Kirschner et al.
patent: 4814972 (1989-03-01), Winter et al.
Telecommunications, vol. 23, No. 3, Mar. 89 p. 30, Philips.
Mullard Research Laboratories Report by G. T. Sharpless et al., Jun. 1977, pp. 19.6-47-19.6-50.

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