Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
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.
Booth Roger
Ellis Peter D.
Kaufman Malcolm E. A.
Selden Gerald P.
Wickstead James C.
Dynamic Broadcasting Network, Inc.
Matar Ahmad F.
Ng Jin F.
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