EP0144770A2
Expired / Lapsed
EP
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CATV Signal Transmitting System and Related Receiving System
Assignee: Sony Corp
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Filing: 1984-11-06
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Granted: —
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Expires: 2004-11-06
Abstract
Abstract @ A CATV (cable television) signal transmitting for use with a broadcast satellite system includes a receiving stage (21, 22) for receiving a broadcast satellite station signal consisting of a base-band video signal and a sub-channel digital audio signals PSK (phase shift keying)-modulated on a subcarrier, a demodulator (231 to 234) for deriving the video signal and digital audio signals, a first modulator (261 to 264) for modulating one main carrier of a plurality of channels of CATV channels by the video signal, a second modulator (265) for modulating the other main carrier of different channels by the digital audio signals in time-division manner. The mixed output signal from the first and second modulators is transmitted through a CATV transmission line (6). A CATV signal receiving system is also provided to produce video signals and digital audio signals which are converted into a plurality of channels of analog audio signals.
Inventors
- 👤 Hiroshi C/O Sony Corporation Sahara
- 👤 Yoshimi C/O Sony Corporation Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 08:51
CPC Classifications
H; H04; H04H; H04H40/00; H04H40/18; H04H40/27; H04H40/90; H04N; H04N7/00; H04N7/06; H04N7/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
150 words
A CATV signal transmitting system comprising: a) receiving means (21) for receiving a broadcast satellite signal consisting of a base-band video signal and a sub-channel digital audio signal modulated on a sub-carrier; b) demodulating means (231 to 234) for deriving the video signal (V 1 to V 4 ) and digital audio signal (S 1 to S 4 ), respectively, from the broadcast satellite station signal; and c) first modulating means (261 to 264) for modulating a main carrier of one of a plurality of CATV channels by said video signal as a base-band signal; characterized by d) second modulating means (265) for modulating a main carrier of the other one of the plurality of CATV channels by said digital audio signal; and e) means (25) for mixing the output signals of said first and second modulating means and for transmitting the mixed signals through a CATV transmission line (6).
Claim 2
Dependent Claim
150 words
A CATV signal transmitting system comprising: a) receiving means (21) for receiving a broadcast satellite signal consisting of a base-band video signal and a sub-channel digital audio signal modulated on a sub-carrier; b) demodulating means (231 to 234) for deriving the video signal (V 1 to V 4 ) and digital audio signal (S 1 to S 4 ), respectively, from the broadcast satellite station signal; and c) first modulating means (261 to 264) for modulating a main carrier of one of a plurality of CATV channels by said video signal as a base-band signal; characterized by d) second modulating means (265) for modulating a main carrier of the other one of the plurality of CATV channels by said digital audio signal; and e) means (25) for mixing the output signals of said first and second modulating means and for transmitting the mixed signals through a CATV transmission line (6).
Claim 3
Dependent Claim
31 words
A CATV signal transmitting system according to claim 1, in which said broadcast satellite station signal is frequency-modulated on one of the main carriers of the plurality of broadcast satellite channels.
Claim 4
Dependent Claim
23 words
A CATV signal transmitting system according to claim 2, in which said sub-channel digital audio signal is PSK (phase-shift keying)-modulated on the sub-carrier.
Claim 5
Dependent Claim
38 words
A CATV signal transmitting system according to claim 1, in which the digital audio signal from said demodulating means is converted into an analog audio signal which is frequency-modulated on a sub-carrier located above said base-band video signal.
Claim 6
Dependent Claim
127 words
A CATV signal receiving system comprising: a) a first tuning stage (31) connected to a CATV transmission line for tuning one channel of a plurality of CATV channels, a main carrier of which is modulated by a base-band video signal; and b) video detecting means (33) connected to said first tuning stage for producing the video signal to be supplied to a display device; characterized by c) a second tuning stage (41) connected to said CATV transmission line for tuning the other one channel of the plurality of CATV channels, a main carrier of which is modulated by said digital audio signal; and d) demodulating means (43) connected to said second tuning stage for producing the digital audio signal to be converted into an analog audio signal.
Claim 7
Dependent Claim
127 words
A CATV signal receiving system comprising: a) a first tuning stage (31) connected to a CATV transmission line for tuning one channel of a plurality of CATV channels, a main carrier of which is modulated by a base-band video signal; and b) video detecting means (33) connected to said first tuning stage for producing the video signal to be supplied to a display device; characterized by c) a second tuning stage (41) connected to said CATV transmission line for tuning the other one channel of the plurality of CATV channels, a main carrier of which is modulated by said digital audio signal; and d) demodulating means (43) connected to said second tuning stage for producing the digital audio signal to be converted into an analog audio signal.
Claim 8
Dependent Claim
141 words
A CATV signal transmitting system comprising: a) receiving means (21) for receiving a plurality of broadcast satellite channel signals, each consisting of a base-band video signal and a sub-channel digital audio signal modulated on a sub-carrier; b) means for demodulating (231 to 234) a plurality of channels of video signals and a plurality of channels of digital audio signal; and c) first means (261 to 264) for modulating main carriers of a plurality of CATV channels by the plurality of channels of video signals, respectively; characterized by d) second means (265) for modulating a selected one main carrier of a plurality of CATV channels by the plurality of channels of digital audio signal; and e) means (25) for combining the output signals of said first and second modulating means and for transmitting the combined signal through a CATV transmission line (6).
Claim 9
Dependent Claim
141 words
A CATV signal transmitting system comprising: a) receiving means (21) for receiving a plurality of broadcast satellite channel signals, each consisting of a base-band video signal and a sub-channel digital audio signal modulated on a sub-carrier; b) means for demodulating (231 to 234) a plurality of channels of video signals and a plurality of channels of digital audio signal; and c) first means (261 to 264) for modulating main carriers of a plurality of CATV channels by the plurality of channels of video signals, respectively; characterized by d) second means (265) for modulating a selected one main carrier of a plurality of CATV channels by the plurality of channels of digital audio signal; and e) means (25) for combining the output signals of said first and second modulating means and for transmitting the combined signal through a CATV transmission line (6).
Claim 10
Dependent Claim
22 words
A CATV signal transmission system according to claim 6, in which said plurality of channels of digital audio signals are time-division multiplexed.
Claim 11
Dependent Claim
23 words
A CATV signal transmission system according to claim 7, in which said time-division multiplexed output digital signals are arranged in the following order;
Claim 12
Dependent Claim
32 words
a) a word synchronizing signal (WS); b) a service bit signal (SB); c) a plurality of channels of digital audio signals (CHA to CHD); and d) an error check code signal (ECC).
Claim 13
Dependent Claim
32 words
a) a word synchronizing signal (WS); b) a service bit signal (SB); c) a plurality of channels of digital audio signals (CHA to CHD); and d) an error check code signal (ECC).
Claim 14
Dependent Claim
32 words
A CATV signal transmitting system according to claim 8, in which each of said plurality of channels of digital audio signals is coded in 16 bits and sampled by 44.1 kHz-sampling frequency.
Claim 15
Dependent Claim
35 words
A CATV signal transmitting system according to claim 8, in which said service bit signal (SB) is indicative of the transmitting mode of different kinds of digital signals at least including said digital audio signals.
References Cited (Backward Citations)
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