CN109167945B - Circuit processing method, device and system for large-slope cable television signal - Google Patents
Circuit processing method, device and system for large-slope cable television signal Download PDFInfo
- Publication number
- CN109167945B CN109167945B CN201811131234.4A CN201811131234A CN109167945B CN 109167945 B CN109167945 B CN 109167945B CN 201811131234 A CN201811131234 A CN 201811131234A CN 109167945 B CN109167945 B CN 109167945B
- Authority
- CN
- China
- Prior art keywords
- frequency
- signal
- pass filter
- preset
- tuner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003672 processing method Methods 0.000 title claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 8
- 230000008054 signal transmission Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
Abstract
The invention discloses a circuit processing method, a device and a system for a large-slope cable television signal, wherein a high-pass filter is added at the signal input end of a high-frequency head; firstly, automatically detecting a network signal; when the loss difference between the first frequency and the second frequency is smaller than the preset decibel under the preset distance of the network signal, the filter is not opened; when the loss difference between the first frequency and the second frequency reaches a preset decibel value under the preset distance of the network signal, the filter is opened; when the high-frequency head receives the low-frequency signal, the frequency threshold value of the filter is set to be a first lower preset frequency and works in a low-frequency part; when receiving a relatively high-frequency signal, the frequency threshold of the filter is set to be a second preset frequency which is higher than the second preset frequency, and the filter works in a high-frequency part, so that the low-frequency signal with relatively higher strength can be filtered, the capability of the tuner for processing a large-slope signal is improved, the condition that a high-end signal leaks or is seriously mosaic is avoided, and the sensitivity index of each frequency point cannot be influenced.
Description
Technical Field
The invention relates to the technical field of cable television signal transmission, in particular to a circuit processing method, a device and a system for a large-slope cable television signal.
Background
As shown in fig. 1 and fig. 2, in the cable television signal transmission process, due to the frequency response problem of the cable, the loss is generally larger as the frequency is higher, and the difference between the loss at 50MHz and the loss at 1000MHz reaches 17dB in a conventional 75-5 cable, that is, if the signal is flat, the signal at 1000MHz is smaller by 17dB when the signal is out.
In some remote users, the signal attenuation at the high frequency end is often very severe due to the long cable length. Frequently encountered places with the slope exceeding 35dB, the conventional tuner often has no way to process the high-end signal, which causes channel leakage or serious mosaic.
The existing tuner is a broadband amplifier at the first stage, nonlinearity can be introduced, cross modulation can be caused by low-frequency large signals, signals at a high-frequency end are influenced, the index of the actually measured counterslope of the common tuner is generally about 25dB, although the index can meet the national standard and has a certain margin, the adaptability to certain network signals is far from insufficient, and the cost of manpower and material resources after sale is greatly increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a circuit processing method, a device and a system for a large-slope cable television signal, and aims to solve the problems that high-frequency signals are seriously attenuated in the cable television signal transmission process, and high-end signals are missed or serious mosaics are caused by the large slope.
The purpose of the invention is realized by adopting the following technical scheme:
a circuit processing method for a high slope cable television signal, comprising:
the method comprises the following steps of firstly, setting a first preset frequency and a second preset frequency of a high-pass filter; the first predetermined frequency is lower than the second predetermined frequency;
a detection step, which is used for automatically detecting the network signal input to the tuner signal input end;
a comparison step, when the loss difference of the network signal under the first frequency and the second frequency is not lower than a preset decibel, controlling a high-pass filter arranged at the signal input end of the high-frequency head to start working;
a low-frequency step, wherein if the high-frequency head receives a low-frequency signal, the frequency threshold of the high-pass filter is set as a first preset frequency, and the low-frequency signal lower than the first preset frequency is filtered by the high-pass filter;
and a high-frequency step, wherein if the high-frequency tuner receives the high-frequency signal, the frequency threshold of the high-pass filter is set to be a second preset frequency, and the high-frequency signal lower than the second preset frequency is filtered by the high-pass filter.
On the basis of the foregoing embodiment, preferably, the detecting step specifically includes:
and automatically detecting the network signal input to the tuner signal input end through a high-pass filter arranged at the tuner signal input end.
On the basis of any of the above embodiments, preferably, the predetermined distance is 100 m; the first frequency is 50 MHz; the second frequency is 1000 MHz; the predetermined decibel is 17 dB.
A circuit processing apparatus for a high slope cable television signal, comprising:
the device comprises an initial module, a high-pass filter and a control module, wherein the initial module is used for setting a first preset frequency and a second preset frequency of the high-pass filter; the first predetermined frequency is lower than the second predetermined frequency;
the detection module is used for automatically detecting the network signal input to the tuner signal input end;
the comparison module is used for controlling a high-pass filter arranged at the signal input end of the high-frequency head to start working when the loss difference of the network signal under the first frequency and the second frequency is not lower than a preset decibel under the preset distance;
the low-frequency module is used for setting the frequency threshold of the high-pass filter as a first preset frequency if the high-frequency head receives the low-frequency signal, and filtering the low-frequency signal lower than the first preset frequency through the high-pass filter;
and the high-frequency module is used for setting the frequency threshold of the high-pass filter as a second preset frequency if the high-frequency tuner receives the high-frequency signal, and filtering out the high-frequency signal lower than the second preset frequency through the high-pass filter.
On the basis of the foregoing embodiment, preferably, the detection module is configured to:
and automatically detecting the network signal input to the tuner signal input end through a high-pass filter arranged at the tuner signal input end.
On the basis of any of the above embodiments, preferably, the predetermined distance is 100 m; the first frequency is 50 MHz; the second frequency is 1000 MHz; the predetermined decibel is 17 dB.
A circuit processing system for a high slope cable television signal comprising:
the circuit processing device for the large-slope cable television signal in any one of the above embodiments; and connected to said circuit processing means
And the high-pass filter is arranged at the signal input end of the high-frequency head and is used for filtering the network signals which are lower than the frequency threshold value in the network signals input to the signal input end of the high-frequency head.
In addition to the above embodiments, preferably, the circuit of the high-pass filter includes a capacitor C1, a varactor diode D1, a varactor diode D2, a capacitor C2, a resistor R1, an inductor L1, an inductor L2, a resistor R2, a resistor R3, and a transistor Q;
the capacitor C1, the variable capacitance diode D1, the variable capacitance diode D2 and the capacitor C2 are connected in sequence; the first end of the capacitor C1, which is far away from the varactor D1, is also connected with a tuner signal input end; the second end of the capacitor C2, which is far away from the varactor D2, is also connected with a filter signal output end;
a first end of the resistor R1 is connected with a first end of the resistor R2, a second end of the resistor R1 is connected between the capacitor C1 and the varactor diode D1, and a second end of the resistor R2 is connected between the capacitor C2 and the varactor diode D2;
the first end of the resistor R3 is connected with the GPIO end in the high-frequency head, and the second end of the resistor R3 is connected with the base electrode of the triode Q; a collector of the triode Q is connected with a first end of an inductor L1, and a second end of an inductor L1 is connected between the variable-capacitance diode D1 and the variable-capacitance diode D2; an emitter of the triode Q is connected with a first end of an inductor L2, and a second end of an inductor L2 is connected between the variable-capacitance diode D1 and the variable-capacitance diode D2; the emitting electrode of the triode Q and the first end of the inductor L2 are both grounded;
the GPIO end in the tuner is also connected between the resistor R1 and the resistor R2;
if the high-frequency head receives a low-frequency signal, setting the frequency threshold of the high-pass filter to be a first preset frequency, enabling the high-pass filter to work at the first preset frequency, enabling a GPIO end in the high-frequency head to output a low level, enabling the capacitance of the variable capacitance diode D1 and the capacitance diode D2 to be large, enabling the inductor L1 to be disconnected from the ground, and enabling a signal output end of the filter to output a low-frequency signal not lower than the first preset frequency;
if the high-frequency tuner receives a high-frequency signal, the frequency threshold of the high-pass filter is set to be a second preset frequency, the high-pass filter works at the second preset frequency, a GPIO end in the high-frequency tuner outputs a high level, capacitance of the variable capacitance diode D1 and capacitance of the variable capacitance diode D2 are reduced, the inductor L1 is connected to the ground, the inductor L1 and the inductor L2 are connected in parallel and then are reduced, and a high-frequency signal with the frequency not lower than the second preset frequency is output from a signal output end of the filter.
On the basis of the above embodiments, preferably, the inductor L1 and the inductor L2 are both air-core inductors; the triode Q is an NPN type triode.
On the basis of any of the above embodiments, preferably, the first predetermined frequency is not higher than 50 MHz; the second predetermined frequency is not lower than 400 MHz.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a circuit processing method, a device and a system for a large-slope cable television signal, wherein a high-pass filter is added at the signal input end of a high-frequency head; firstly, automatically detecting a network signal; when the loss difference of the network signal under the first frequency and the second frequency is smaller than the preset decibel under the preset distance, the filter is not opened; when the loss difference between the first frequency and the second frequency reaches a preset decibel value under the preset distance of the network signal, the filter is opened; when the high-frequency head receives the low-frequency signal, the frequency threshold value of the filter is set to be a first lower preset frequency and works in a low-frequency part; when receiving a relatively high-frequency signal, the frequency threshold of the filter is set to be a second preset frequency which is higher than the second preset frequency, and the filter works in a high-frequency part, so that the low-frequency signal with relatively higher strength can be filtered, the capability of the tuner for processing a large-slope signal is improved, the condition that a high-end signal leaks or is seriously mosaic is avoided, and the sensitivity index of each frequency point cannot be influenced.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 shows a schematic diagram of the attenuation constant of a coaxial cable in hundredths of a meter;
FIG. 2 shows a diagram of losses at different frequencies at a distance of 100 m;
FIG. 3 is a flow chart illustrating a circuit processing method for a high-slope cable TV signal according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating simulation results of a circuit for processing low frequency signals for a large slope cable television signal according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating simulation results of a circuit for processing high frequency signals for a large slope cable television signal according to an embodiment of the present invention;
FIG. 6 is a schematic diagram showing a circuit processing apparatus for a high-slope cable TV signal according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a circuit processing system for a high-slope cable TV signal according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of a high-pass filter according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Detailed description of the preferred embodiment
As shown in fig. 3, an embodiment of the present invention provides a circuit processing method for a large-slope cable television signal, including:
an initial step S101, setting a first preset frequency and a second preset frequency of a high-pass filter; the first predetermined frequency is lower than the second predetermined frequency;
a detection step S102, which is used for automatically detecting the network signal input to the tuner signal input end;
comparing step S103, when the loss difference of the network signal under the first frequency and the second frequency is not lower than the preset decibel, controlling a high-pass filter arranged at the signal input end of the high-frequency head to start working;
a low-frequency step S104, if the high-frequency head receives the low-frequency signal, setting the frequency threshold of the high-pass filter as a first preset frequency, and filtering the low-frequency signal lower than the first preset frequency through the high-pass filter;
and a high-frequency step S105, if the high-frequency tuner receives the high-frequency signal, setting the frequency threshold of the high-pass filter to be a second preset frequency, and filtering the high-frequency signal lower than the second preset frequency through the high-pass filter.
The embodiment of the invention does not limit the preset distance, the first frequency, the second frequency and the preset decibel, preferably, the preset distance can be 100 m; the first frequency may be 50 MHz; the second frequency may be 1000 MHz; the predetermined decibel division may be 17 dB.
In the embodiment of the invention, a high-pass filter is added at the signal input end of a high-frequency head; firstly, automatically detecting a network signal; when the loss difference of the network signal under the first frequency and the second frequency is smaller than the preset decibel under the preset distance, the filter is not opened; when the loss difference between the first frequency and the second frequency reaches a preset decibel value under the preset distance of the network signal, the filter is opened; when the high-frequency head receives the low-frequency signal, the frequency threshold value of the filter is set to be a first lower preset frequency and works in a low-frequency part; when receiving a relatively high-frequency signal, the frequency threshold of the filter is set to be a second preset frequency which is higher than the second preset frequency, and the filter works in a high-frequency part, so that the low-frequency signal with relatively higher strength can be filtered, the capability of the tuner for processing a large-slope signal is improved, the condition that a high-end signal leaks or is seriously mosaic is avoided, and the sensitivity index of each frequency point cannot be influenced.
The embodiment of the present invention does not limit the manner of automatically detecting the network signal, and the network signal may be detected by using an introduced high-pass filter, and preferably, the detecting step S102 may specifically be: and automatically detecting the network signal input to the tuner signal input end through a high-pass filter arranged at the tuner signal input end.
Fig. 4 and fig. 5 are schematic diagrams illustrating simulation results of a circuit for processing a low-frequency signal and a high-frequency signal of a large-slope cable television signal according to an embodiment of the present invention. The line marked with m1 and m2 in the figure is a processed network signal, the other line is the reflection loss of a high-pass filter, m1 and m2 are respectively positioned in a low-frequency region and a high-frequency region, and as can be seen from the figure, when the filter receives a low-frequency signal, a lower frequency threshold value is set, so that the low-frequency signal and the high-frequency signal can both pass through; and when the filter receives the high-frequency signal, a higher frequency threshold value is set, only the network signal with higher frequency can be transmitted at the moment, and the low-frequency signal with higher intensity is effectively filtered.
In the first embodiment, a method for processing a cable television signal with a large slope is provided, and a device for processing a cable television signal with a large slope is also provided. Since the apparatus embodiments are substantially similar to the method embodiments, they are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for relevant points. The device embodiments described below are merely illustrative.
Detailed description of the invention
As shown in fig. 6, an embodiment of the present invention provides a circuit processing apparatus for a large-slope cable television signal, including:
an initial module 201, configured to set a first predetermined frequency and a second predetermined frequency of the high-pass filter; the first predetermined frequency is lower than the second predetermined frequency;
a detection module 202, configured to automatically detect a network signal input to a tuner signal input terminal;
the comparison module 203 is configured to control a high-pass filter arranged at a signal input end of the tuner to start working when it is detected that the loss difference between the first frequency and the second frequency of the network signal at the predetermined distance is not lower than a predetermined decibel;
the low-frequency module 204 is configured to set a frequency threshold of the high-pass filter to a first predetermined frequency if the high-frequency tuner receives the low-frequency signal, and filter the low-frequency signal lower than the first predetermined frequency through the high-pass filter;
and the high-frequency module 205 is configured to set the frequency threshold of the high-pass filter to a second predetermined frequency if the high-frequency tuner receives the high-frequency signal, and filter out the high-frequency signal lower than the second predetermined frequency through the high-pass filter.
In the embodiment of the invention, a high-pass filter is added at the signal input end of a high-frequency head; firstly, automatically detecting a network signal; when the loss difference of the network signal under the first frequency and the second frequency is smaller than the preset decibel under the preset distance, the filter is not opened; when the loss difference between the first frequency and the second frequency reaches a preset decibel value under the preset distance of the network signal, the filter is opened; when the high-frequency head receives the low-frequency signal, the frequency threshold value of the filter is set to be a first lower preset frequency and works in a low-frequency part; when receiving a relatively high-frequency signal, the frequency threshold of the filter is set to be a second preset frequency which is higher than the second preset frequency, and the filter works in a high-frequency part, so that the low-frequency signal with relatively higher strength can be filtered, the capability of the tuner for processing a large-slope signal is improved, the condition that a high-end signal leaks or is seriously mosaic is avoided, and the sensitivity index of each frequency point cannot be influenced.
Preferably, the detection module 202 may be configured to:
and automatically detecting the network signal input to the tuner signal input end through a high-pass filter arranged at the tuner signal input end.
Preferably, the predetermined distance may be 100 m; the first frequency may be 50 MHz; the second frequency may be 1000 MHz; the predetermined decibel division may be 17 dB.
Detailed description of the preferred embodiment
As shown in fig. 7, an embodiment of the present invention provides a circuit processing system for a large-slope cable television signal, including:
the circuit processing apparatus 301 for any large slope cable television signal in the second embodiment; and connected to said circuit processing means 301
And the high-pass filter 302 is arranged at the tuner signal input end and is used for filtering the network signals which are lower than the frequency threshold value in the network signals input to the tuner signal input end.
In the embodiment of the invention, a high-pass filter is added at the signal input end of a high-frequency head; firstly, automatically detecting a network signal; when the loss difference of the network signal under the first frequency and the second frequency is smaller than the preset decibel under the preset distance, the filter is not opened; when the loss difference between the first frequency and the second frequency reaches a preset decibel value under the preset distance of the network signal, the filter is opened; when the high-frequency head receives the low-frequency signal, the frequency threshold value of the filter is set to be a first lower preset frequency and works in a low-frequency part; when receiving a relatively high-frequency signal, the frequency threshold of the filter is set to be a second preset frequency which is higher than the second preset frequency, and the filter works in a high-frequency part, so that the low-frequency signal with relatively higher strength can be filtered, the capability of the tuner for processing a large-slope signal is improved, the condition that a high-end signal leaks or is seriously mosaic is avoided, and the sensitivity index of each frequency point cannot be influenced.
The filter circuit is not limited in the present invention, and preferably, as shown in fig. 8, the circuit of the high-pass filter may be provided with a capacitor C1, a varactor diode D1, a varactor diode D2, a capacitor C2, a resistor R1, an inductor L1, an inductor L2, a resistor R2, a resistor R3, and a triode Q;
the capacitor C1, the variable capacitance diode D1, the variable capacitance diode D2 and the capacitor C2 are connected in sequence; the first end of the capacitor C1, which is far away from the varactor D1, is also connected with a tuner signal input end; the second end of the capacitor C2, which is far away from the varactor D2, is also connected with a filter signal output end;
a first end of the resistor R1 is connected with a first end of the resistor R2, a second end of the resistor R1 is connected between the capacitor C1 and the varactor diode D1, and a second end of the resistor R2 is connected between the capacitor C2 and the varactor diode D2;
the first end of the resistor R3 is connected with the GPIO end in the high-frequency head, and the second end of the resistor R3 is connected with the base electrode of the triode Q; a collector of the triode Q is connected with a first end of an inductor L1, and a second end of an inductor L1 is connected between the variable-capacitance diode D1 and the variable-capacitance diode D2; an emitter of the triode Q is connected with a first end of an inductor L2, and a second end of an inductor L2 is connected between the variable-capacitance diode D1 and the variable-capacitance diode D2; the emitting electrode of the triode Q and the first end of the inductor L2 are both grounded;
the GPIO end in the tuner is also connected between the resistor R1 and the resistor R2;
if the high-frequency head receives a low-frequency signal, setting the frequency threshold of the high-pass filter to be a first preset frequency, enabling the high-pass filter to work at the first preset frequency, enabling a GPIO end in the high-frequency head to output a low level, enabling the capacitance of the variable capacitance diode D1 and the capacitance diode D2 to be large, enabling the inductor L1 to be disconnected from the ground, and enabling a signal output end of the filter to output a low-frequency signal not lower than the first preset frequency;
if the high-frequency tuner receives a high-frequency signal, the frequency threshold of the high-pass filter is set to be a second preset frequency, the high-pass filter works at the second preset frequency, a GPIO end in the high-frequency tuner outputs a high level, capacitance of the variable capacitance diode D1 and capacitance of the variable capacitance diode D2 are reduced, the inductor L1 is connected to the ground, the inductor L1 and the inductor L2 are connected in parallel and then are reduced, and a high-frequency signal with the frequency not lower than the second preset frequency is output from a signal output end of the filter.
The embodiment of the invention does not limit the types of the inductor and the triode, preferably, the inductor L1 and the inductor L2 can be hollow inductor coils; the transistor Q may be an NPN transistor.
Preferably, the first predetermined frequency may be not higher than 50 MHz; the second predetermined frequency may be not lower than 400 MHz.
The present invention has been described in terms of its practical application, and it is to be understood that the above description and drawings are only illustrative of the presently preferred embodiments of the invention and are not to be considered as limiting, since all changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. Although the present invention has been described to a certain extent, it is apparent that appropriate changes in the respective conditions may be made without departing from the spirit and scope of the present invention. It is to be understood that the invention is not limited to the described embodiments, but is to be accorded the scope consistent with the claims, including equivalents of each element described. Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (10)
1. A circuit processing method for a high-slope cable television signal, wherein a high-pass filter is provided at a tuner signal input terminal, said circuit processing method comprising:
an initial step, setting a first preset frequency and a second preset frequency of the high-pass filter; the first predetermined frequency is lower than the second predetermined frequency;
a detection step, which is used for automatically detecting the network signal input to the tuner signal input end;
a comparison step, when the loss difference of the network signal under the first frequency and the second frequency is not lower than a preset decibel, controlling the high-pass filter arranged at the signal input end of the high-frequency head to start working;
a low-frequency step, wherein if the high-frequency head receives a low-frequency signal, the frequency threshold of the high-pass filter is set as a first preset frequency, and the low-frequency signal lower than the first preset frequency is filtered by the high-pass filter;
and a high-frequency step, wherein if the high-frequency tuner receives a high-frequency signal, the frequency threshold of the high-pass filter is set to be a second preset frequency, and the high-frequency signal lower than the second preset frequency is filtered by the high-pass filter.
2. The method for processing a large-slope cable television signal according to claim 1, wherein the detecting step specifically comprises:
and automatically detecting the network signal input to the tuner signal input end through a high-pass filter arranged at the tuner signal input end.
3. The method for processing a large-slope cable television signal according to claim 1 or 2, wherein the predetermined distance is 100 m; the first frequency is 50 MHz; the second frequency is 1000 MHz; the predetermined decibel is 17 dB.
4. A circuit processing apparatus for a high-slope cable television signal, wherein a high-pass filter is provided at a tuner signal input, said circuit processing apparatus further comprising:
an initial module, configured to set a first predetermined frequency and a second predetermined frequency of the high-pass filter; the first predetermined frequency is lower than the second predetermined frequency;
the detection module is used for automatically detecting the network signal input to the tuner signal input end;
the comparison module is used for controlling the high-pass filter arranged at the signal input end of the high-frequency head to start working when the loss difference of the network signal under the first frequency and the second frequency is not lower than the preset decibel under the preset distance;
the low-frequency module is used for setting the frequency threshold of the high-pass filter as a first preset frequency if the high-frequency head receives a low-frequency signal, and filtering the low-frequency signal lower than the first preset frequency through the high-pass filter;
and the high-frequency module is used for setting the frequency threshold of the high-pass filter to be a second preset frequency if the high-frequency tuner receives the high-frequency signal, and filtering out the high-frequency signal lower than the second preset frequency through the high-pass filter.
5. The apparatus for processing high slope cable television signal according to claim 4, wherein said detection module is configured to:
and automatically detecting the network signal input to the tuner signal input end through a high-pass filter arranged at the tuner signal input end.
6. The apparatus for processing a large-slope cable television signal according to claim 4 or 5, wherein the predetermined distance is 100 m; the first frequency is 50 MHz; the second frequency is 1000 MHz; the predetermined decibel is 17 dB.
7. A circuit processing system for a high slope cable television signal, comprising: circuit processing means for large slope cable television signals according to any of claims 4 to 6; and the high-pass filter is connected with the circuit processing device, is arranged at the signal input end of the high-frequency head and is used for filtering network signals which are lower than a frequency threshold value in the network signals input to the signal input end of the high-frequency head.
8. The circuit processing system for large-slope cable television signals according to claim 7, wherein the circuit of the high-pass filter is provided with a capacitor C1, a varactor D1, a varactor D2, a capacitor C2, a resistor R1, an inductor L1, an inductor L2, a resistor R2, a resistor R3, a triode Q;
the capacitor C1, the variable capacitance diode D1, the variable capacitance diode D2 and the capacitor C2 are connected in sequence; the first end of the capacitor C1, which is far away from the varactor D1, is also connected with a tuner signal input end; the second end of the capacitor C2, which is far away from the varactor D2, is also connected with a filter signal output end;
a first end of the resistor R1 is connected with a first end of the resistor R2, a second end of the resistor R1 is connected between the capacitor C1 and the varactor diode D1, and a second end of the resistor R2 is connected between the capacitor C2 and the varactor diode D2;
the first end of the resistor R3 is connected with the GPIO end in the high-frequency head, and the second end of the resistor R3 is connected with the base electrode of the triode Q; a collector of the triode Q is connected with a first end of an inductor L1, and a second end of an inductor L1 is connected between the variable-capacitance diode D1 and the variable-capacitance diode D2; an emitter of the triode Q is connected with a first end of an inductor L2, and a second end of an inductor L2 is connected between the variable-capacitance diode D1 and the variable-capacitance diode D2; the emitting electrode of the triode Q and the first end of the inductor L2 are both grounded;
the GPIO end in the tuner is also connected between the resistor R1 and the resistor R2;
if the high-frequency head receives a low-frequency signal, setting the frequency threshold of the high-pass filter to be a first preset frequency, enabling the high-pass filter to work at the first preset frequency, enabling a GPIO end in the high-frequency head to output a low level, enabling the capacitance of the variable capacitance diode D1 and the capacitance diode D2 to be large, enabling the inductor L1 to be disconnected from the ground, and enabling a signal output end of the filter to output a low-frequency signal not lower than the first preset frequency;
if the high-frequency tuner receives a high-frequency signal, the frequency threshold of the high-pass filter is set to be a second preset frequency, the high-pass filter works at the second preset frequency, a GPIO end in the high-frequency tuner outputs a high level, capacitance of the variable capacitance diode D1 and capacitance of the variable capacitance diode D2 are reduced, the inductor L1 is connected to the ground, the inductor L1 and the inductor L2 are connected in parallel and then are reduced, and a high-frequency signal with the frequency not lower than the second preset frequency is output from a signal output end of the filter.
9. The system of claim 8, wherein the inductor L1 and the inductor L2 are all hollow inductors; the triode Q is an NPN type triode.
10. A circuit processing system for a large slope cable television signal according to any of claims 7 to 9, wherein said first predetermined frequency is not higher than 50 MHz; the second predetermined frequency is not lower than 400 MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811131234.4A CN109167945B (en) | 2018-09-27 | 2018-09-27 | Circuit processing method, device and system for large-slope cable television signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811131234.4A CN109167945B (en) | 2018-09-27 | 2018-09-27 | Circuit processing method, device and system for large-slope cable television signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109167945A CN109167945A (en) | 2019-01-08 |
| CN109167945B true CN109167945B (en) | 2020-09-25 |
Family
ID=64892512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811131234.4A Active CN109167945B (en) | 2018-09-27 | 2018-09-27 | Circuit processing method, device and system for large-slope cable television signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109167945B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11341453A (en) * | 1998-05-21 | 1999-12-10 | Sharp Corp | Network interface module |
| US7106388B2 (en) * | 1999-12-15 | 2006-09-12 | Broadcom Corporation | Digital IF demodulator for video applications |
| US7360235B2 (en) * | 2002-10-04 | 2008-04-15 | Scientific-Atlanta, Inc. | Systems and methods for operating a peripheral record/playback device in a networked multimedia system |
| JP2009194517A (en) * | 2008-02-13 | 2009-08-27 | Alps Electric Co Ltd | Television tuner |
| JP2011019168A (en) * | 2009-07-10 | 2011-01-27 | Alps Electric Co Ltd | Reception tuner |
| JP6165052B2 (en) * | 2013-12-26 | 2017-07-19 | キヤノン株式会社 | Vibration correction apparatus, imaging apparatus having the same, vibration correction method, and program |
-
2018
- 2018-09-27 CN CN201811131234.4A patent/CN109167945B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109167945A (en) | 2019-01-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104994204B (en) | Reduce the method and system of terminal display screen interference | |
| CN109194349B (en) | Building construction real-time monitoring system based on thing networking | |
| EP3149863B1 (en) | A surge protector for a transceiver | |
| CN109167945B (en) | Circuit processing method, device and system for large-slope cable television signal | |
| CN219957722U (en) | Balanced detector | |
| CN112213620B (en) | Harmonic distortion test circuit of communication device | |
| CN101692700A (en) | Method and circuit for controlling audio signal channel of television | |
| US8302147B2 (en) | System and method for processing a common cable signal using a low-pass filter tap | |
| CN109194358B (en) | Hydrology water resource data transmission system based on thing networking | |
| CN103873158A (en) | Radio-frequency measurement device with variable attenuator | |
| CN110601669A (en) | Water consumption analysis system | |
| CN105323027B (en) | Broadcasting receiver and tuner | |
| CN218938375U (en) | Detection circuit for solving detection degradation harmonic wave in power amplifier | |
| CN210867603U (en) | Low noise amplifier for frequency selection of full frequency band | |
| US20050258918A1 (en) | Impedance-matching wave filter | |
| CN105100790A (en) | Slope monitoring circuit | |
| CN211856740U (en) | Millimeter wave broadband wave detector | |
| CN207782788U (en) | Reduce the device being distorted when geography information transmission | |
| CN210867600U (en) | Low-noise amplifier for ground signal transmission | |
| US11057615B2 (en) | Inventory tracking in cable TV system | |
| CN114401379B (en) | Video buffer circuit and video device | |
| KR100272920B1 (en) | Image output circuit | |
| CN210157246U (en) | Temperature compensation type attenuation equalization circuit of cable television network | |
| CN210053387U (en) | High-pass filter and detector for partial discharge detection of high-voltage power equipment | |
| CN210351141U (en) | Broadband mixing filter circuit compatible with 5G communication frequency band |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231130 Address after: 215600 No.188, South Ring Road, Tangqiao town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: JIANGSU YINHE ELECTRONICS Co.,Ltd. Address before: 215600 No.188, South Ring Road, Tangqiao town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: JIANGSU YINHE DIGITAL TECHNOLOGY CO.,LTD. |