EP1081909A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Communication system
Assignee: Ricos Co Ltd
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Filing: 1994-06-27
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Granted: —
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Expires: 2014-06-27
Abstract
Abstract A communications system includes a host computer (1) for sending a scrambled data body, descrambling data (10), and a loader (11). A plurality of terminals (2) is provided to receive transmissions from said host computer (1). A first communications link (4) is established between said host computer (1) and at least one of said plurality of terminals (2). A second communications link (3) is implemented for communicating said scrambled data body from said host computer (1) to said at least one of said plurality of terminals (2) in response to an individual request from that respective terminal (2). The terminal (2) may be provided with an external memory device (8) for storing the data body, descrambling data (10), and loader (11).
Inventors
- 👤 Mihoji Tsumura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 17:04
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/167; H04L; H04L63/00; H04L63/04; A; A63; A63F; A63F13/00; A63F13/30; A63F13/33; A63F13/335; A63F13/338; A63F13/70; A63F13/71; H04L9/00; H04L9/40; H04N7/173
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
80 words
A communications system comprising: a host computer (1) for sending a scrambled data body,
descrambling data, and a loader; a plurality of terminals (2) that receive transmissions from said
host computer; a first communications link (4) between said host computer and
at least one of said plurality of terminals; and a second communications link (3) implemented for
communicating in a cyclic manner, said scrambled data body from
said host computer to said at least one of said plurality of terminals.
Claim 2
Dependent Claim
15 words
The communications systems according to claim 1, wherein said first
communications link (4) is bidirectional.
Claim 3
Dependent Claim
17 words
The communications systems according to claim 1 or 2, wherein said
second communciations link (3) is unidirectional.
Claim 4
Dependent Claim
26 words
The communications systems according to any of the claims 1 to 3,
wherein said first and said second communciations link form a single
communications link (5).
Claim 5
Dependent Claim
25 words
The communications systems according to any of the claims 1 to 4,
wherein said host computer (1) includes means for downloading said
descrambling data (11).
Claim 6
Dependent Claim
20 words
The communications systems according to claim 5, wherein said host
computer (1) includes means for descrambling said scrambled data
body.
Claim 7
Dependent Claim
24 words
The communications systems according to any of the claims 1 to 6,
wherein said host computer (1) includes means for descrambling said
loader (10).
Claim 8
Dependent Claim
39 words
The communications system according to any of the claims 1 to 7,
wherein said host computer (1) includes means for executing said
data body to a respective terminal (2) in response to an individual
request from said respective terminal.
Claim 9
Dependent Claim
33 words
The communications systems according to any of the claims 1 to 8,
wherein at least one of said plurality of terminals (2) includes an
external memory device (8) for storing said data body.
Claim 10
Dependent Claim
33 words
The communications systems according to any of the claims 1 to 9,
wherein at least one of said plurality of terminals (2) includes an
external memory device (8) for storing said descrambling data.
Claim 11
Dependent Claim
32 words
The communications systems according to any of the claims 1 to 10,
wherein at least one of said plurality of terminals (2) includes an
external memory device (8) for storing said loader.
Claim 12
Dependent Claim
37 words
The communications systems according to any of the claims 1 to 11,
wherein at least one of said plurality of terminals (2) includes means
for storing said descrambling data to available space of a main
memory (9).
Claim 13
Dependent Claim
36 words
The communications systems according to any of the claims 1 to 11,
wherein at least one of said plurality of terminals (2) includes means
for storing said loader to available space of a main memory (9).
Claim 14
Dependent Claim
23 words
The communications systems according to claim 12 or 13, wherein
said main memory (9) is associated with said at least one terminal (2).
Claim 15
Dependent Claim
24 words
The communications systems according to any of the claims 1 to 14,
wherein said loader (10) includes means for descrambling said
scrambled data body.
Claim 16
Dependent Claim
24 words
The communications systems according to claim 15, wherein said
descrambling of said scrambled data body is achieved by reference to
said descrambling data (11).
Claim 17
Dependent Claim
27 words
The communications system according to any of the claims 9 to 14,
wherein said external memory device (8) includes means for
automatically deleting said descrambling data (11).
Claim 18
Dependent Claim
26 words
The communications system according to any of the claims 9 to 14,
wherein said external memory device (8) includes means for
automatically deleting said loader (10).
Claim 19
Dependent Claim
27 words
The communications system according to any of the claims 9 to 14,
wherein said external memory device (8) includes means for
automatically deleting said descrambling data (11).
Claim 20
Dependent Claim
26 words
The communications system according to any of the claims 9 to 14,
wherein said external memory device (8) includes means for
automatically rewriting said loader (10).
Claim 21
Dependent Claim
25 words
The communications system according to claim 17 or 18, wherein said
deleting takes place after the completion of decoding and transferring
said scrambled data body.
Claim 22
Dependent Claim
25 words
The communications system according to claim 19 or 20, wherein said
deleting takes place after the completion of decoding and transferring
said scrambled data body.
Claim 23
Dependent Claim
26 words
The communications system according to claim 17 or 18, wherein said
deleting takes place before completion of data processing at said at
least one terminal (2).
Claim 24
Dependent Claim
26 words
The communications system according to claim 19 or 20, wherein said
rewriting takes place before completion of data processing at said at
least one terminal (2).
Claim 25
Dependent Claim
38 words
The communications system according to claim 17 or 18, wherein said
deleting takes place after the completion of decoding and transferring
said scrambled data body and before completion of data processing
at said at least one terminal (2).
Claim 26
Dependent Claim
38 words
The communications system according to claim 19 or 20, wherein said
rewriting takes place after the completion of decoding and transferring
said scrambled data body and before completion of data processing
at said at least one terminal (2).
Claim 27
Dependent Claim
18 words
The communications system according to claim 3, wherein said
unidirectional communications link is a satellite communications link
(3).
Claim 28
Dependent Claim
18 words
The communications system according to claim 2, wherein said
bidirectional communications link is a public communications network
(4).
Claim 29
Dependent Claim
20 words
The communications system according to claim 2 or 28, wherein said
bidirectional communications link is an interactive CATV network (5).
Claim 30
Dependent Claim
73 words
A communications system comprising a host computer (21) and a
plurality of terminals (22) each of which is connected thereto via a
public communciations network (23), wherein said host computer (21)
identifies, from among the terminals (22), any terminal having the
communications means that sets the lowest data transmission rate,
and said host computer (21) sets the data transmission rates of said
terminals (22) simultaneously connected thereto to said lowest data
transmission rate.
Claim 31
Dependent Claim
57 words
The communications system according to claim 30, wherein said host
computer (21) determines the data transmission rate of the
communications means of a new terminal (22) connected thereto,
compares said data transmission rate with the currently used data
transmission rate, and sets to all the terminals, either said current or
new data transmission rate, whichever is lower.
Claim 32
Dependent Claim
19 words
The communications system according to claim 30 or 32, wherein said
communciations means is a modem (26a to 26b).
References Cited (Backward Citations)
US4258433A
Cited
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