CN1110953C - Safety terminal with coaxial cable transmission of cable TV - Google Patents
Safety terminal with coaxial cable transmission of cable TV Download PDFInfo
- Publication number
- CN1110953C CN1110953C CN99113711A CN99113711A CN1110953C CN 1110953 C CN1110953 C CN 1110953C CN 99113711 A CN99113711 A CN 99113711A CN 99113711 A CN99113711 A CN 99113711A CN 1110953 C CN1110953 C CN 1110953C
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- radio
- central processing
- processing unit
- frequency
- interface unit
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Abstract
The present invention relates to a coaxial cable transmission security terminal for cable televisions, which comprises a sensor interface unit, a central processing unit, an RF modulator, a duplexer, an RF demodulator and a power source, wherein the RF modulator is used for the RF modulation of upstream signals; the duplexer provides a channel for separating the upstream signals and the downstream signals of RF; the RF demodulator is used for the RF demodulation of the downstream signals; the power source provides power supply for all units. Thus, the present invention provides the security equipment with the advantages of high speed, reliability and low cost by fully utilizing the resources of the existing cable television network.
Description
Technical field:
The present invention relates to a kind of safety terminal, relate in particular to a kind of safety terminal with coaxial cable transmission of cable TV.
Background technology:
At present, the employed security network of people is by physical medium independently, and as coaxial cable, twisted-pair cable is formed link network.Necessary laying-out when this link network of structure so often causes the overlapping investment of engineering, the construction cost height, and the cycle is long.
Summary of the invention:
The object of the present invention is to provide a kind of safety terminal with coaxial cable transmission of cable TV, it is arranged on the place that will monitor, by the existing wired TV network, make and to carry out the security message transmission between network principal, thereby avoided setting up the required investment of cover security facilities.
To achieve the above object, the present invention, a kind of safety terminal with coaxial cable transmission of cable TV, it is positioned at the place that needs supervision, be connected the end of cable tv coax, it comprises: sensor interface unit, and it links to each other with central processing unit, comprise mobile object interface unit and fixed object interface unit, be used for the external signal that transducer receives is converted into the signal of telecommunication; Central processing unit, it receives the signal of telecommunication from sensor interface unit, is used for the processing of signal data and coordination and the management between each unit; Radio-frequency modulator, it receives the signal data from central processing unit, is used for the rf modulations of upward signal data; Duplexer, it is made up of low pass filter and high pass filter two parts of linking to each other, and radio frequency up-downgoing carrier signal split tunnel is provided, and low pass filter links to each other with radio-frequency modulator; Radio-frequency (RF) demodulator, it receives the downstream signal data from the high pass filter of duplexer, is used for the radio demodulating of downstream signal data, and with the input of the signal data after demodulation central processing unit; And, power supply, it is to sensor interface unit, central processing unit, radio-frequency modulator, radio-frequency (RF) demodulator power supply.
Owing to adopted above-mentioned technical solution, make the present invention can make full use of existing cable TV network resource, security facilities quick, reliable, low price are provided, this equipment has this locality of reception and two kinds of supply power modes of far-end simultaneously.
The present invention is further illustrated below in conjunction with the embodiments of the invention accompanying drawing.
Description of drawings:
Fig. 1 is the functional block diagram of safety terminal with coaxial cable transmission of cable TV of the present invention.
Embodiment:
As shown in Figure 1, a kind of safety terminal with coaxial cable transmission of cable TV, it comprises:
Radio-frequency modulator 3, it receives the signal data from central processing unit 2, the rf modulations that is used for the upward signal data, can adopt the data carrier modulation of at present common frequency shift keying and phase shift keying form, be modulated to radiofrequency signal, this frequency of carrier signal symbol frequency channels of cable TV up channel standard;
Duplexer 5, it is made up of 42MHz (megahertz) low pass filter 51 and 48MHz (megahertz) high pass filter 52 two parts of linking to each other, and radio frequency up-downgoing carrier signal split tunnel is provided, and low pass filter links to each other with radio-frequency modulator;
Radio-frequency (RF) demodulator 4, it receives the downstream signal data from the high pass filter 52 of duplexer, is used for the radio demodulating of downstream signal data, and with the input of the signal data after demodulation central processing unit 2; And
To sum up, after sensor interface unit is received alarm logic level from transducer, central processing unit is handled these level, and be modulated to radiofrequency signal with certain data stream format, this frequency of carrier signal distributes and meets cable TV up channel standard, central processing unit is also handled the data flow from radio demodulating unit simultaneously, finishes functions such as terminal addressing, terminal control.
Claims (1)
1. safety terminal with coaxial cable transmission of cable TV, it is connected the end of cable tv coax, and it comprises central processing unit, radio-frequency modulator, radio-frequency (RF) demodulator and power supply, it is characterized in that, it also comprises sensor interface unit and duplexer, wherein:
Sensor interface unit, it links to each other with central processing unit, comprises mobile object interface unit and fixed object interface unit, is used for the external signal that transducer receives is converted into the signal of telecommunication;
Central processing unit, it receives the signal of telecommunication from sensor interface unit, is used for the processing of signal data and coordination and the management between each unit;
Radio-frequency modulator, it receives the signal data from central processing unit, is used for the rf modulations of upward signal data;
Duplexer, it is made up of low pass filter and high pass filter two parts of linking to each other, and radio frequency up-downgoing carrier signal split tunnel is provided, and low pass filter links to each other with radio-frequency modulator;
Radio-frequency (RF) demodulator, it receives the downstream signal data from the high pass filter of duplexer, is used for the radio demodulating of downstream signal data, and with the input of the signal data after demodulation central processing unit; And
Power supply, it is to sensor interface unit, central processing unit, radio-frequency modulator, radio-frequency (RF) demodulator power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99113711A CN1110953C (en) | 1999-05-17 | 1999-05-17 | Safety terminal with coaxial cable transmission of cable TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99113711A CN1110953C (en) | 1999-05-17 | 1999-05-17 | Safety terminal with coaxial cable transmission of cable TV |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1274243A CN1274243A (en) | 2000-11-22 |
| CN1110953C true CN1110953C (en) | 2003-06-04 |
Family
ID=5276872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99113711A Expired - Lifetime CN1110953C (en) | 1999-05-17 | 1999-05-17 | Safety terminal with coaxial cable transmission of cable TV |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1110953C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1795624B (en) * | 2003-03-28 | 2010-12-29 | 北方电讯网络有限公司 | Method and apparatus for processing multiple common frequency signals through a single cable |
| CN111614849A (en) * | 2020-04-15 | 2020-09-01 | 北京瀚诺半导体科技有限公司 | Indoor communication system based on coaxial cable |
-
1999
- 1999-05-17 CN CN99113711A patent/CN1110953C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1274243A (en) | 2000-11-22 |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BEIER AERKATE CO., LTD., SHANGHAI Free format text: FORMER NAME: BELL CO.,LTD., SHANGHAI Owner name: SHANGHAI ALCATEL-LUCENT CO., LTD. Free format text: FORMER NAME: BEIER AERKATE CO., LTD., SHANGHAI |
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| CP01 | Change in the name or title of a patent holder |
Address after: 201206 No. 388 Nanjing Road, Jinqiao Development Zone, Shanghai, Pudong Patentee after: ALCATEL-LUCENT SHANGHAI BELL Co.,Ltd. Address before: 201206 No. 388 Nanjing Road, Jinqiao Development Zone, Shanghai, Pudong Patentee before: Shanghai Bell Alcatel Co.,Ltd. Address after: 201206 No. 388 Nanjing Road, Jinqiao Development Zone, Shanghai, Pudong Patentee after: Shanghai Bell Alcatel Co.,Ltd. Address before: 201206 No. 388 Nanjing Road, Jinqiao Development Zone, Shanghai, Pudong Patentee before: Shanghai Bell Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 201206 No. 388 Nanjing Road, Jinqiao Development Zone, Shanghai, Pudong Patentee after: NOKIA SHANGHAI BELL Co.,Ltd. Address before: 201206 No. 388 Nanjing Road, Jinqiao Development Zone, Shanghai, Pudong Patentee before: ALCATEL-LUCENT SHANGHAI BELL Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20030604 |
|
| CX01 | Expiry of patent term |