EP0516058A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multiplex transmission system
Assignee: Panasonic Holdings Corp
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Filing: 1992-05-26
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Granted: —
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Expires: 2012-05-26
Abstract
Abstract It is intended that a plurality of signals including a power source and a video signal are transmitted through a coaxial cable without deteriorating the characteristic of the video signal. The video signal is transmitted in its base band from a video signal sending-out circuit (19). A sync signal and a remote control signal are modulated by modulators (5, 6) at different predetermined frequencies and these modulated signals are transmitted via a filter (7). The transmitted modulated signals are separated into the corresponding frequency components which are demodulated into the original signals by demodulators (17, 18) into the original signals. A power source, after it is regulated into a constant current, is transmitted. It is impedance-converted and regulated into a stabilized constant voltage to be applied to a load (24).
Inventors
- 👤 Masaaki Shimizu
- 👤 Takashi Kawano
- 👤 Yasutaka Yoshida
- 👤 Yuichi Takenaga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 00:38
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/10; H04N7/08; H04N7/081
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
A multiplex transmission system wherein a remote control signal and a sync signal are modulated at frequencies outside the base band of a video signal, and these modulated video signal remote control signal and the sync signal are multiplexed for their transmission in such a manner that the modulated remote control signal is located within the vertical blanking period of the video signal.
Claim 2
Dependent Claim
24 words
A multiplex transmission system wherein the signal resulting from multiplexing the modulated signal and the video signal is transmitted through a coaxial cable (12).
Claim 3
Dependent Claim
91 words
A multiplex transmission apparatus comprising: a first modulator (6) for modulating a remote control signal at a first frequency (f5); a second modulator (5) for modulating a sync signal at a second frequency (f4) which is different from said first frequency; means (7, 8, 9) for multiplexing the outputs from said first and said second modulator and a video signal to provide a composite signal; and means (12) for transmitting said composite signal, wherein said first and said second frequency are selected frequencies outside the base band of the video signal.
Claim 4
Dependent Claim
47 words
A multiplex transmission apparatus according to any preceding claim , wherein the outputs from said first and said second modulator are applied to a filter (7) having passbands of said first and said second frequency, and the output from said filter and the video signal are multiplexed.
Claim 5
Dependent Claim
117 words
A multiplex transmission apparatus comprising: pulse generating means (25) for generating pulses in synchronism with a video signal; first modulating means (6) for modulating a remote control signal at a first frequency (f5) outside the base band of the video signal so that the modulated remote control signal is located within the vertical blanking period; second modulating means (5) for modulating a sync signal at a second frequency (f4) which is outside the base band of the video signal and different from said first frequency; means (7, 8, 9) for multiplexing the outputs from said first and said second modulator and a video signal to provide a composite signal; and means (12) for transmitting said composite signal.
Claim 6
Dependent Claim
155 words
A multiplex transmission apparatus comprising: pulse generating means (25) for generating pulses in synchronism with a video signal; first modulating means (6) for modulating a remote control signal at a first frequency (f5) outside the base band of the video signal so that the modulated remote control signal is located within the vertical blanking period; second modulating means (5) for modulating a sync signal at a second frequency (f4) which is outside the base band of the video signal and different from said first frequency; means (7, 8, 9) for multiplexing the outputs from said first and said second modulator and a video signal to provide a composite signal; means (12) for transmitting said composite signal; a filter (16) extracting the components corresponding to said first and said second frequency from the said composite signal; and first and second demodulating means (17, 18) for demodulating said first and second frequency components extracted by said filter.
Claim 7
Dependent Claim
28 words
A multiplex transmission apparatus according to claim 5, further comprising a power source circuit (10) the output from which is multiplexed with said video signal to be transmitted.
Claim 8
Dependent Claim
28 words
A multiplex transmission apparatus according to claim 6, further comprising a power source circuit (10) the output from which is multiplexed with said video signal to be transmitted.
Claim 9
Dependent Claim
35 words
A multiplex transmission apparatus according to claim 7, further comprising means (11) for regulating the output from said power source circuit to a constant current to be multiplexed with said video signal for its transmission.
Claim 10
Dependent Claim
35 words
A multiplex transmission apparatus according to claim 8, further comprising means (11) for regulating the output from said power source circuit to a constant current to be multiplexed with said video signal for its transmission.
References Cited (Backward Citations)
No citation records indexed.
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