CN107302346A - The circuit that a kind of solution WiFi is disturbed CATV radio-frequency lines - Google Patents
The circuit that a kind of solution WiFi is disturbed CATV radio-frequency lines Download PDFInfo
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- CN107302346A CN107302346A CN201710722686.9A CN201710722686A CN107302346A CN 107302346 A CN107302346 A CN 107302346A CN 201710722686 A CN201710722686 A CN 201710722686A CN 107302346 A CN107302346 A CN 107302346A
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- electric capacity
- inductance
- circuit
- filter circuit
- catv
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H1/0007—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of radio frequency interference filters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Filters And Equalizers (AREA)
Abstract
The invention provides the circuit that a kind of solution WiFi is disturbed CATV radio-frequency lines, including：One-level filter circuit, secondary filter circuit, the one-level filter circuit is used for the low frequency invalid signals for filtering out CATV, and the 2.4GHz signals that the secondary filter circuit is inputted to the one-level filter circuit are suppressed.Compared with prior art, the beneficial effects of the invention are as follows：There is provided a kind of with low cost, realize simple filter circuit.It is characterized in particular in, by increasing two stage filter circuit on CATV rf signal lines, filters out WiFi signal and its interference signal of introducing, it is ensured that CATV signal qualitys.Whole circuit realiration only needs to a small amount of electric capacity and inductance, and interference problem of traditional anti-WiFi signal to CATV radiofrequency signals is solved with very low cost.
Description
Technical field
The invention belongs to image communication technology field, it is related to TV set-top box filter circuit, it is more particularly to a kind of to solve
The circuit that WiFi is disturbed CATV radio-frequency lines.
Background technology
With the integration of three networks and the development of NGB technologies.Surfed the Net by set top box, while Digital TV Development user,
User is developed into broadband user and multi-services are provided the user as a kind of new trend.In this regard, radio and TV operator
The different access style convergent terminal products such as STB+CM+WiFi, STB+Eoc+WiFi are released to dominate the market.But wireless WiFi's makes
With making partial TV channel signals degradation, or even Individual channels show mosaic, user watched effect is had a strong impact on.Study carefully it
Reason, is that WiFi carrier signals local oscillator leakage and its harmonic wave are interfered to CATV radio-frequency lines, causes set top box to receive sensitive
Degree is deteriorated, hydraulic performance decline.
CATV radio-frequency lines are disturbed for WiFi signal and generally handled using following several method, user's access is improved and penetrates
Frequency signal level and reduction WiFi transmission powers are realized.The anti-dry of CATV signals can be lifted by improving the method for user's access level
Ability is disturbed, but additionally increases multiplying arrangement, operation cost is improved.WiFi transmission powers are reduced to sacrifice WiFi performances as cost,
Reduce user experience.
The content of the invention
The invention aims to high, the technical problem of poor user experience that solves existing filter apparatus application cost,
Propose the circuit that a kind of a kind of low cost, solution WiFi signal in set top box is disturbed CATV radio-frequency lines.
The technical scheme is that：A kind of circuit that solution WiFi is disturbed CATV radio-frequency lines, it is characterised in that institute
Stating circuit includes：Filter circuit, the filter circuit is used for the low frequency invalid signals for filtering out CATV radio-frequency lines, and to described
Signal after the filtering of CATV radio-frequency lines is suppressed.
Preferred scheme, the filter circuit includes, one-level filter circuit, secondary filter circuit, the one-level filter circuit
Low frequency invalid signals for filtering out CATV radio-frequency lines, the secondary filter circuit is exported to the one-level filter circuit
2.4GHz signals are suppressed.
Preferred scheme, the one-level filter circuit includes：Protection circuit, 1 rank filter circuit, adjustment circuit, the protection
Circuit structure is：Electric capacity C1 one end is connected with the CATV signal ends, and the electric capacity C1 other ends are connected with inductance L1 one end, institute
Inductance L1 other ends ground connection is stated, the 1 rank filter circuit construction is：Electric capacity C2 one end connects with the electric capacity C1, inductance L1 nodes
Connect, the electric capacity C2 other ends are connected with inductance L2 one end, the inductance L2 other ends are connected with electric capacity C3 one end, the electric capacity
The C3 other ends are grounded, and the adjustment circuit mechanism is：Electric capacity C8 one end and the electric capacity C6, inductance L4 Node connectedness, the electricity
Hold the C8 other ends to connect respectively at inductance L5, electric capacity C9 one end, the electric capacity C9 other ends ground connection.
Preferred scheme, is provided with 2 rank filter circuits, the 2 rank filter circuit between the 1 rank filter circuit and adjustment circuit
Structure is：Electric capacity C5 one end and the electric capacity C2, inductance L2 Node connectedness, the electric capacity C5 other ends connect with electric capacity C4 one end
Connect, the electric capacity C4 other ends are connected with inductance L3 one end, the inductance L3 other ends ground connection.
Preferred scheme, is provided with 3 rank filter circuits, the 3 rank filter circuit between the 2 rank filter circuit and adjustment circuit
Structure is：Electric capacity C6 one end and the electric capacity C5, electric capacity C4 Node connectedness, the electric capacity C6 other ends connect with inductance L4 one end
Connect, the inductance L4 other ends are connected with electric capacity C7 one end, the electric capacity C7 other ends ground connection.
Preferred scheme, the secondary filter circuit structure is：Inductance L21 one end respectively with inductance L22, inductance L23 one end
Connection, the inductance L21 other ends are connected with electric capacity C21 one end, the electric capacity C21 other ends ground connection.
Preferred scheme, the secondary filter circuit structure is：Inductance L12 one end is respectively at electric capacity C11, inductance L11 one end
Connection, the inductance L12 other ends are connected with electric capacity C12 one end, the electric capacity C12 other ends ground connection, inductance L13 one end difference
Connected in the electric capacity C11, the inductance L11 other ends, the inductance L13 other ends are connected with electric capacity C13 one end, the electric capacity
The C13 other ends are grounded.
Preferred scheme, the secondary filter circuit turn-on frequency range is below 1GHz.
Preferred scheme, the electric capacity C1 is the DC voltage on high-voltage capacitance, isolation CATV radio-frequency lines.
Preferred scheme, the circuit is applied to TV set-top box.
Beneficial effects of the present invention：Compared with prior art, it is an advantage of the current invention that with low cost, realization is simple.Tool
Body is, by increasing two stage filter circuit on CATV rf signal lines, filters out WiFi signal and its interference signal of introducing,
Ensure CATV signal qualitys.Whole circuit realiration only needs to a small amount of electric capacity and inductance, and solving traditional anti-WiFi with very low cost believes
Number to the interference problems of CATV radiofrequency signals.
Brief description of the drawings
The circuit system block diagram that Fig. 1 is disturbed CATV radio-frequency lines for a kind of solution WiFi of the present invention；
Fig. 2 is the one-level filter circuit principle for the circuit that a kind of solution WiFi of the invention is disturbed CATV radio-frequency lines
Figure；
Fig. 3 is the first of a kind of secondary filter circuit of solution WiFi of present invention circuits disturbed CATV radio-frequency lines
Embodiment schematic diagram；
Fig. 4 is the second of a kind of secondary filter circuit of solution WiFi of present invention circuits disturbed CATV radio-frequency lines
Embodiment schematic diagram.
Embodiment
Embodiments of the invention are designed according to the principle of the present invention, below in conjunction with the accompanying drawings with specific examples below pair
The present invention is further elaborated.
The circuit system block diagram that solution WiFi as shown in Figure 1 is disturbed CATV radio-frequency lines, WiFi pairs of the present embodiment
The circuit of CATV radio-frequency lines interference：By wire radio communication system CATV signals through F access machines in RF communication systems
Top box STB, into one-level filter circuit, one-level filter circuit is used for the low frequency invalid signals for filtering out CATV radio-frequency lines, then
Secondary filter circuit is entered back into, secondary filter circuit is suppressed the 2.4GHz signals that one-level filter circuit is exported, most passed through afterwards
The CATV radiofrequency signals for having crossed above-mentioned two stage filter processing of circuit are demodulated into tuner Tuner.
Preferred embodiment scheme, Fig. 2 is one-level filter circuit schematic diagram, and the one-level filter circuit includes：Protection circuit,
1 rank filter circuit, 2 rank filter circuits, 3 rank filter circuits, adjustment circuit, the protection circuit structure is：Electric capacity C1 one end with
The CATV signal ends connection, the electric capacity C1 other ends are connected with inductance L1 one end, the inductance L1 other ends ground connection；It is described
1 rank filter circuit construction is：Electric capacity C2 one end and the electric capacity C1, inductance L1 Node connectedness, the electric capacity C2 other ends and electricity
Feel the connection of L2 one end, the inductance L2 other ends are connected with electric capacity C3 one end, the electric capacity C3 other ends ground connection；The 2 rank filter
Wave circuit structure is：Electric capacity C5 one end and the electric capacity C2, inductance L2 Node connectedness, the electric capacity C5 other ends and electric capacity C4 mono-
End connection, the electric capacity C4 other ends are connected with inductance L3 one end, the inductance L3 other ends ground connection；The 3 rank filter circuit
Structure is：Electric capacity C6 one end and the electric capacity C5, electric capacity C4 Node connectedness, the electric capacity C6 other ends connect with inductance L4 one end
Connect, the inductance L4 other ends are connected with electric capacity C7 one end, the electric capacity C7 other ends ground connection, the adjustment circuit structure are：
Electric capacity C8 one end and the electric capacity C6, inductance L4 Node connectedness, the electric capacity C8 other ends are respectively at inductance L5, electric capacity C9 one end
Connection, the electric capacity C9 other ends ground connection.The present invention is not limited only to above-mentioned 1 rank filter circuit, 2 rank filter circuits, 3 rank filtered electricals
Road, according to real network needs, can increase or decrease the exponent number of filter circuit.
Preferred embodiment scheme, Fig. 3 is the first embodiment schematic diagram of secondary filter circuit, and the circuit structure is：Inductance
L21 one end is connected with inductance L22, inductance L23 one end respectively, and the inductance L21 other ends are connected with electric capacity C21 one end, described
The electric capacity C21 other ends are grounded.This circuit is the T-shaped low pass filter of 1 rank, and the circuit turn-on frequency range is that (frequency is below 1GHz
The effective working frequency range of STB), and a trap is produced in 2.4Ghz frequencies, effectively filter out the WiFi local oscillator leakages in radiofrequency signal
And harmonic wave.
Preferred embodiment scheme, Fig. 4 is the second embodiment schematic diagram of secondary filter circuit, and the circuit structure is：Inductance
L12 one end is connected respectively at electric capacity C11, inductance L11 one end, and the inductance L12 other ends are connected with electric capacity C12 one end, described
The electric capacity C12 other ends are grounded, and inductance L13 one end is connected respectively at the electric capacity C11, the inductance L11 other ends, the inductance L13
The other end is connected with electric capacity C13 one end, the electric capacity C13 other ends ground connection.This circuit is 1 rank π type low pass filters, the circuit
Conducting frequency range is below 1GHz (frequency is the effective working frequency range of STB), and produces a trap, effectively filter in 2.4Ghz frequencies
Except the WiFi local oscillator leakages and harmonic wave in radiofrequency signal.
Preferred embodiment scheme, the electric capacity C1 is the DC voltage on high-voltage capacitance, isolation CATV signal wires, and to this
Circuit is protected, and prevents electric capacity C1 is breakdown from burning circuit.
Preferred embodiment scheme, this circuit is used suitable for TV set top box device, improves user watched effect.
One of ordinary skill in the art will be appreciated that embodiment described here is to aid in reader and understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such especially statement and embodiment.This area
Those of ordinary skill can make according to these technical inspirations disclosed by the invention various does not depart from the other each of essence of the invention
Plant specific deformation and combine, these deformations and combination are still within the scope of the present invention.
Claims (10)
1. the circuit that a kind of solution WiFi is disturbed CATV radio-frequency lines, it is characterised in that the circuit includes：Filter circuit,
The filter circuit is used for the low frequency invalid signals for filtering out CATV radio-frequency lines, and to the letter after CATV radio-frequency lines filtering
Number suppressed.
2. the circuit that a kind of solution WiFi according to claim 1 is disturbed CATV radio-frequency lines, it is characterised in that described
Filter circuit includes, one-level filter circuit, secondary filter circuit, and the low frequency that the one-level filter circuit is used to filter out CATV is invalid
Signal, the 2.4GHz signals that the secondary filter circuit is exported to the one-level filter circuit are suppressed.
3. the circuit that a kind of solution WiFi according to claim 2 is disturbed CATV radio-frequency lines, it is characterised in that described
One-level filter circuit includes：Protection circuit, 1 rank filter circuit, adjustment circuit, the protection circuit structure is：Electric capacity C1 one end
It is connected with the CATV signal ends, the electric capacity C1 other ends are connected with inductance L1 one end, the inductance L1 other ends ground connection, institute
Stating 1 rank filter circuit construction is：Electric capacity C2 one end and the electric capacity C1, inductance L1 Node connectedness, the electric capacity C2 other ends with
Inductance L2 one end is connected, and the inductance L2 other ends are connected with electric capacity C3 one end, the electric capacity C3 other ends ground connection, the adjustment
Circuit structure is：Electric capacity C8 one end and the electric capacity C6, inductance L4 Node connectedness, the electric capacity C8 other ends are respectively at inductance
L5, the connection of electric capacity C9 one end, the electric capacity C9 other ends ground connection.
4. the circuit that a kind of solution WiFi according to claim 3 is disturbed CATV radio-frequency lines, it is characterised in that described
2 rank filter circuits are provided between 1 rank filter circuit and adjustment circuit, the 2 rank filter circuit construction is：Electric capacity C5 one end and institute
Electric capacity C2, inductance L2 Node connectedness are stated, the electric capacity C5 other ends are connected with electric capacity C4 one end, the electric capacity C4 other ends and electricity
Feel the connection of L3 one end, the inductance L3 other ends ground connection.
5. the circuit that a kind of solution WiFi according to claim 4 is disturbed CATV radio-frequency lines, it is characterised in that described
3 rank filter circuits are provided between 2 rank filter circuits and adjustment circuit, the 3 rank filter circuit construction is：Electric capacity C6 one end and institute
Electric capacity C5, electric capacity C4 Node connectedness are stated, the electric capacity C6 other ends are connected with inductance L4 one end, the inductance L4 other ends and electricity
Hold the connection of C7 one end, the electric capacity C7 other ends ground connection.
6. the circuit that a kind of solution WiFi according to claim 2 is disturbed CATV radio-frequency lines, it is characterised in that described
Secondary filter circuit structure is：Inductance L21 one end is connected with inductance L22, inductance L23 one end respectively, the inductance L21 other ends
It is connected with electric capacity C21 one end, the electric capacity C21 other ends ground connection.
7. the circuit that a kind of solution WiFi according to claim 2 is disturbed CATV radio-frequency lines, it is characterised in that described
Secondary filter circuit structure is：Inductance L12 one end is connected respectively at electric capacity C11, inductance L11 one end, the inductance L12 other ends
It is connected with electric capacity C12 one end, the electric capacity C12 other ends ground connection, inductance L13 one end is respectively at the electric capacity C11, inductance L11
The other end is connected, and the inductance L13 other ends are connected with electric capacity C13 one end, the electric capacity C13 other ends ground connection.
8. the circuit that a kind of solution WiFi according to claim 6 or 7 is disturbed CATV radio-frequency lines, it is characterised in that
The secondary filter circuit turn-on frequency range is below 1GHz.
9. the circuit that a kind of solution WiFi according to claim 3 is disturbed CATV radio-frequency lines, it is characterised in that described
Electric capacity C1 is the DC voltage on high-voltage capacitance, isolation CATV radio-frequency lines.
What 10. a kind of solution WiFi according to any one claim of claim 1 to 7 was disturbed CATV radio-frequency lines
Circuit, it is characterised in that the circuit is applied to TV set-top box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710722686.9A CN107302346B (en) | 2017-08-22 | 2017-08-22 | Circuit for solving interference of WiFi to CATV radio frequency circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710722686.9A CN107302346B (en) | 2017-08-22 | 2017-08-22 | Circuit for solving interference of WiFi to CATV radio frequency circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107302346A true CN107302346A (en) | 2017-10-27 |
| CN107302346B CN107302346B (en) | 2021-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710722686.9A Active CN107302346B (en) | 2017-08-22 | 2017-08-22 | Circuit for solving interference of WiFi to CATV radio frequency circuit |
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| Country | Link |
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| CN (1) | CN107302346B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1871767A (en) * | 2003-08-20 | 2006-11-29 | 马克西姆综合产品公司 | Broadband integrated digitally tunable filters |
| CN101138153A (en) * | 2005-03-11 | 2008-03-05 | Rf信息公司 | Radio frequency inductive-capacitive filter circuit topology |
| CN202261187U (en) * | 2011-08-26 | 2012-05-30 | 希姆通信息技术（上海）有限公司 | Radio-frequency tuning circuit of mobile terminal |
| CN103532511A (en) * | 2013-10-08 | 2014-01-22 | 桂林市思奇通信设备有限公司 | Combiner with divider function |
| CN204652547U (en) * | 2014-11-27 | 2015-09-16 | 四川长虹电器股份有限公司 | A kind of digital TV antenna isolator of filtering EOC, WIFI interference |
| CN105432017A (en) * | 2013-07-29 | 2016-03-23 | 维斯普瑞公司 | Adaptive filter response systems and methods |
| CN205142155U (en) * | 2015-08-10 | 2016-04-06 | 西安邮电大学 | IF filter in radiofrequency signal transceiver chip |
-
2017
- 2017-08-22 CN CN201710722686.9A patent/CN107302346B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1871767A (en) * | 2003-08-20 | 2006-11-29 | 马克西姆综合产品公司 | Broadband integrated digitally tunable filters |
| CN101138153A (en) * | 2005-03-11 | 2008-03-05 | Rf信息公司 | Radio frequency inductive-capacitive filter circuit topology |
| CN202261187U (en) * | 2011-08-26 | 2012-05-30 | 希姆通信息技术（上海）有限公司 | Radio-frequency tuning circuit of mobile terminal |
| CN105432017A (en) * | 2013-07-29 | 2016-03-23 | 维斯普瑞公司 | Adaptive filter response systems and methods |
| CN103532511A (en) * | 2013-10-08 | 2014-01-22 | 桂林市思奇通信设备有限公司 | Combiner with divider function |
| CN204652547U (en) * | 2014-11-27 | 2015-09-16 | 四川长虹电器股份有限公司 | A kind of digital TV antenna isolator of filtering EOC, WIFI interference |
| CN205142155U (en) * | 2015-08-10 | 2016-04-06 | 西安邮电大学 | IF filter in radiofrequency signal transceiver chip |
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| Publication number | Publication date |
|---|---|
| CN107302346B (en) | 2021-07-02 |
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