EP0247625A2
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EP
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A digital signal transmitting system
Assignee: Sony Corp
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Filing: 1987-05-29
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Granted: —
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Expires: 2007-05-29
Abstract
Abstract A digital signal transmitting system includes a plurality of digital signal reproducers (2a, 2b...), each outputting a digital data signal to be time-division multiplexed; a digital signal multiplexer (4) supplied with a frame synchronizing signal, a service bit signal and the output digital signals from the reproducers and for producing a block data signal including the frame synchronizing signal, the service bit signal and a plurality of slot data bits arranged with the digital data signals, each one bit within a multiple-frame, in which the service bit signal is indicative of the transmission mode and the slot data associated with each of the plurality of digital data signals being transmitted.
Inventors
- 👤 Kohichi C/O Nippon Telegraph Suto
- 👤 Hisayoshi C/O Nippon Telegraph Sugiyama
- 👤 Akira Sakamoto
- 👤 Takeshi Fukami
- 👤 Toshiro Terauchi
- 👤 Masakatsu Toyoshima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 07:26
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/10; H04J; H04J3/00; H04J3/16; H04J3/1605
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
144 words
A digital signal transmitting system characterized by (a) a plurality of digital signal reproducers (2a, 2b,...,4b, 4c...), each outputting a digital data signal to be time-division multiplexed; (b) a digital data signal multiplexer (4) connected to receive a frame synchronizing signal, a service bit signal and the output signals of said plurality of digital signal reproducers, for producing a block data signal including said frame synchronizing signal, said service bit signal and a plurality of slot data bits arranged with said digital data signals each one bit within a multiple-frame, in which said service bit signal is indicative of the transmission mode and the slot data being transmitted with each of said plurality of digital data signals; and (c) means (4a, 5) for modulating the output of said digital data signal multiplexer so as to transmit the same through a transmission line (8a, 8b...).
Claim 2
Dependent Claim
144 words
A digital signal transmitting system characterized by (a) a plurality of digital signal reproducers (2a, 2b,...,4b, 4c...), each outputting a digital data signal to be time-division multiplexed; (b) a digital data signal multiplexer (4) connected to receive a frame synchronizing signal, a service bit signal and the output signals of said plurality of digital signal reproducers, for producing a block data signal including said frame synchronizing signal, said service bit signal and a plurality of slot data bits arranged with said digital data signals each one bit within a multiple-frame, in which said service bit signal is indicative of the transmission mode and the slot data being transmitted with each of said plurality of digital data signals; and (c) means (4a, 5) for modulating the output of said digital data signal multiplexer so as to transmit the same through a transmission line (8a, 8b...).
Claim 3
Dependent Claim
44 words
A digital signal transmitting system according to claim l, characterized in that said transmission mode is selected to transmit selected signals from the group including stereo digital audio signals, a combination of digital data with monaural digital audio signals, and all digital data signals.
Claim 4
Dependent Claim
35 words
A digital signal transmitting system according to claim l or 2, characterized by means for designating selected signals which are stereo digital audio signals in accordance with whether or not an emphasis characteristic is ON.
Claim 5
Dependent Claim
60 words
A digital signal transmitting system according to any one of claims l to 3, characterized in that the transmission rate of said block data signal is selected to be n . f₀; where n = l, 2, 3 ... N, N is equal to the maximum data slot number in said multiple-frame, and f₀ is the frequency of said multiple-frame
Claim 6
Dependent Claim
57 words
A digital signal transmitting system according to any one of claims l to 3, characterized in that the transmission rate of said block data signal is selected to be 2 m. f₀; wherein 2 m ≦ N, N is equal to the maximum d slot number in said multiple-frame, and f₀ is the frequency of said multiple-frame.
Claim 7
Dependent Claim
45 words
A digital signal transmitting system according to any one of claims l to 5, characterized in that said service bit signal of a multi-super-frame, which includes a plurality of super-frames consisting of a plurality of said multiple-frames, is formed with a block service bit signal.
Claim 8
Dependent Claim
31 words
A digital signal transmitting system according to claim 6, characterized in that the slot data to be transmitted with a plurality of programs are mulitplexed within said block service bit signal.
Claim 9
Dependent Claim
50 words
A digital signal transmitting system according to any one of claims l to 7, characterized by including a modulator (4a) for modulating the multiplexed digital signal from said digital signal multiplexer (4) on a carrier of a CATV channel, and means (5) for mixing carrier with other CATV channel signals.
Claim 10
Dependent Claim
60 words
A digital signal transmitting system according to claim 8, characterized by a plurality of tuners (6a, 6b...), each being supplied with said CATV channel signals, means (7a, 7b...) for demodulating a selected one channel of the CATV signal and means for transmitting the demodulated multiplexed digital signal through an optical fiber cable (8a, 8b...) to a corresponding receiving terminal (B).
Claim 11
Dependent Claim
17 words
A digital signal transmitting system according to claim 9, characterized in that said receiving terminal (B) includes:
Claim 12
Dependent Claim
18 words
(a) a frame synchronizing signal detector (l0g) for detecting the frame synchronizing signal from said block data signal;
Claim 13
Dependent Claim
18 words
(a) a frame synchronizing signal detector (l0g) for detecting the frame synchronizing signal from said block data signal;
Claim 14
Dependent Claim
17 words
(b) a service bit detector (l0h) for detecting the service bit signal from said block data signal;
Claim 15
Dependent Claim
17 words
(b) a service bit detector (l0h) for detecting the service bit signal from said block data signal;
Claim 16
Dependent Claim
32 words
(c) a controller (l0i) supplied with the slot data from the output of said service bit detector (l0h) and for producing a data extracting pattern in response to said slot data; and
Claim 17
Dependent Claim
32 words
(c) a controller (l0i) supplied with the slot data from the output of said service bit detector (l0h) and for producing a data extracting pattern in response to said slot data; and
Claim 18
Dependent Claim
20 words
(d) a data extractor (l0j) supplied with the data extracting pattern so as to produce a predetermined digital data signal.
Claim 19
Dependent Claim
20 words
(d) a data extractor (l0j) supplied with the data extracting pattern so as to produce a predetermined digital data signal.
References Cited (Backward Citations)
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