EP0420289A2
Expired / Lapsed
EP
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Cable-saving type CCTV system
Assignee: Panasonic Holdings Corp
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Filing: 1990-09-28
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Granted: —
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Expires: 2010-09-28
Abstract
Abstract A cable-saving type CCTV system for transmitting a multiplexed video signal over a single coaxial cable (15) connecting a camera site (11, 12) and a control site (13, 14) by frequency-modulating a bi-directional audio signal (124, 134) and producing a digital control signal and a digital alarm signal and multiplexing the resultant signals and an external synchronizing signal in a blanking period of the video signal (122, 123, 125, 126, 132, 135, 136).
Inventors
- 👤 Kazuo Ota
- 👤 Satoshi Soma
- 👤 Hajime Matsumoto
- 👤 Takayuki Kimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:27
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/087; H04N7/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
A cable-saving type CCTV system comprising: camera-site equipment (11, 12); control-site means (13, 14); signal processing means for transmitting between said camera-site equipment and said control-site means a multiplexed signal containing at least a sub signal multiplexed with a main signal formed of a video signal, said signal processing means including a single coaxial cable (15) for transmission of said multiplexed signal, and means (122∼126, 132∼136) for multiplexing said sub signal with said main signal and for separating said sub signal from the multiplexed signal.
Claim 2
Dependent Claim
85 words
A cable-saving type CCTV system comprising: camera-site equipment (11, 12); control-site means (13, 14); signal processing means for transmitting between said camera-site equipment and said control-site means a multiplexed signal containing at least a sub signal multiplexed with a main signal formed of a video signal, said signal processing means including a single coaxial cable (15) for transmission of said multiplexed signal, and means (122∼126, 132∼136) for multiplexing said sub signal with said main signal and for separating said sub signal from the multiplexed signal.
Claim 3
Dependent Claim
31 words
A cable-saving type CCTV system according to claim 1, wherein said sub signal is formed of an audio signal, and wherein said signal processing means comprises an FM modem (124, 134).
Claim 4
Dependent Claim
57 words
A cable-saving type CCTV system according to claim 1, wherein said sub signal is formed of a camera-site equipment control signal, and wherein said signal processing means comprises means (122, 123, 125; 132, 133, 135) for superposing said sub signal as a pulse signal on said video signal during a vertical blanking period of the video signal.
Claim 5
Dependent Claim
144 words
A cable-saving type CCTV system comprising: camera-site equipment (11); means (12) for receiving a first type signal for said camera-site equipment; control-site means (13, 14) including means (132) for receiving a second type signal for the control-site means; a coaxial cable connecting said camera-site equipment, said receiving means and said control-site means in order to transmit a video signal; means (124, 126) for multiplexing said first type signal with the transmitted video signal, transmitting the multiplexed signal over said coaxial cable, receiving the multiplexed signal, and separating said signal of the first type from the multiplexed signal; means (132, 133, 135) for multiplexing said second type signal to the transmitted video signal and transmitting the multiplexed signal over said coaxial cable; and signal processing means (112, 114), provided in said camera-site equipment, for separating the transmitted second type signal from the transmitted video signal.
Claim 6
Dependent Claim
144 words
A cable-saving type CCTV system comprising: camera-site equipment (11); means (12) for receiving a first type signal for said camera-site equipment; control-site means (13, 14) including means (132) for receiving a second type signal for the control-site means; a coaxial cable connecting said camera-site equipment, said receiving means and said control-site means in order to transmit a video signal; means (124, 126) for multiplexing said first type signal with the transmitted video signal, transmitting the multiplexed signal over said coaxial cable, receiving the multiplexed signal, and separating said signal of the first type from the multiplexed signal; means (132, 133, 135) for multiplexing said second type signal to the transmitted video signal and transmitting the multiplexed signal over said coaxial cable; and signal processing means (112, 114), provided in said camera-site equipment, for separating the transmitted second type signal from the transmitted video signal.
Claim 7
Dependent Claim
94 words
A cable-saving type CCTV system having a camera, camera-site equipment, and a controller, comprising: a single coaxial cable for transmitting a video signal generated by said camera to said equipment and said controller; signal processing means for multiplexing a sub signal to said video signal and transmitting the multiplexed signal, wherein said sub signal is at least one of a bi-directional audio signal, control signals for said camera and peripheral equipment thereof, an alarm signal from the camera site, an external synchronizing signal to the camera site, and a control signal for the controller.
Claim 8
Dependent Claim
94 words
A cable-saving type CCTV system having a camera, camera-site equipment, and a controller, comprising: a single coaxial cable for transmitting a video signal generated by said camera to said equipment and said controller; signal processing means for multiplexing a sub signal to said video signal and transmitting the multiplexed signal, wherein said sub signal is at least one of a bi-directional audio signal, control signals for said camera and peripheral equipment thereof, an alarm signal from the camera site, an external synchronizing signal to the camera site, and a control signal for the controller.
References Cited (Backward Citations)
No citation records indexed.
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