CN104092970A - Low-pass circuit signal processing method and device for cable television network - Google Patents
Low-pass circuit signal processing method and device for cable television network Download PDFInfo
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- CN104092970A CN104092970A CN201410341479.5A CN201410341479A CN104092970A CN 104092970 A CN104092970 A CN 104092970A CN 201410341479 A CN201410341479 A CN 201410341479A CN 104092970 A CN104092970 A CN 104092970A
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Abstract
The invention relates to a low-pass circuit signal processing method and device for a cable television network. The method includes the steps that when the voltage in a low-pass circuit is not zero, and if a low-pass circuit signal value is larger than or equal to a connection value A, the low-pass circuit is switched on; if the low-pass circuit signal value is smaller than or equal to a disconnection value B, the low-pass circuit is grounded; if the low-pass circuit signal value is larger than the disconnection value B and is smaller than the connection value A, the low-pass circuit keeps the original connection state; when the voltage in the low-pass circuit is zero, the low-pass circuit is switched on; the device comprises a branch device, a high-pass filter, an operational amplifier comparator and a change-over switch. The low-pass circuit comprises a principal line circuit and a branch circuit, the low-pass circuit is provided with the branch device, the branch circuit is provided with the high-pass filter and the operational amplifier comparator. The position close to the connection position of a signal input end, the principal line circuit and the branch circuit is provided with the change-over switch. The low-pass circuit signal processing method and device can switch off the user side and uploads a standby low-frequency signal automatically, and interference of too many random signals on the cable television network center is avoided.
Description
Technical field
The present invention relates to cable television network field, particularly relate to a kind of cable television network low pass circuit signal processing method and device.
Background technology
In recent years, cable television network develop rapidly, conventionally cable television system comprises front end system, transmission system and user side, under normal circumstances, network signal from user side to cable television network transmission user signal, is transferred to user side by high pass circuit by the network signal of cable television network by low pass circuit.
Existing cable television network generally can receive all signals that user side transmits, when user's TV is during in holding state, user side still can transmit low frequency signal to cable television network, each signal that cable television network receives and processes, the low frequency signal producing when standby can disturb the normal work at cable television network center, has increased workload and the error rate at cable television network center.
How to found one automatic shutdown signal in the time that user side does not use cable television network and upload, avoid cable television network to be subject to new cable television network low pass circuit signal processing method and the device of the interference of hash, belong in fact one of current important research and development problem.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of cable television network low pass circuit signal processing method and device, its automatic shutdown signal in the time that user side does not use cable television network is uploaded, avoid cable television network to be subject to the interference of hash, and do not affect user side and normally use, be vulnerable to thereby overcome existing cable television network center the deficiency that hash disturbs.
For solving the problems of the technologies described above, the invention provides a kind of cable television network low pass circuit signal processing method, comprise the following steps: in the time that the voltage in low pass circuit is non-vanishing, set respectively connection value A and cut off value B, described connection value A is more than or equal to described cut off value B; If the low pass circuit signal value detecting is more than or equal to connection value A, low pass circuit is communicated with, and signal is transferred to cable television network from user side; If the low pass circuit signal value detecting is less than or equal to cut off value B, low pass circuit ground connection, signal cannot be transferred to cable television network; If the low pass circuit signal detecting is greater than cut off value B and is less than connection value A, it is constant that low pass circuit keeps its original connection status; In the time that the voltage in low pass circuit is zero, low pass circuit is communicated with cable television network.
Improve as one, described connection value A is 14-18dBmV, and described cut off value B is 1-15dBmV.
Further, described connection value A is 15dBmV, and described cut off value B is 12dBmV.
The present invention also provides a kind of cable television network low pass circuit signal processing apparatus of applying said method, comprise splitter, high pass filter, amplifier comparator and change over switch, described low pass circuit comprises main line circuit and branch circuit two parts, near in the low pass circuit of signal output part, splitter is installed, branch circuit is provided with high pass filter and amplifier comparator, main line circuit, branch circuit and cable television network are connected with change over switch respectively, and described change over switch is also connected with earthed circuit.
Described amplifier comparator is SGM8052XMS amplifier comparator.
On described earthed circuit, be connected with load.
Adopt after such design, the present invention at least has the following advantages:
In the time that the signal frequency of user side is lower, user side is generally in holding state, standby signal all uploads to cable television network can cause larger interference to the signal of network center, affect normal signal judgement, the present invention is set with connection value and cut off value, in the time that signal is too low, user side low pass circuit ground connection, user side signal cannot upload to cable television network, has avoided the interference of too much hash to cable television network center, is conducive to improve the operating efficiency at cable television network center.
In the time that user side need use cable television network, low pass circuit can automatic switching on, neither affects user's normal use, can avoid again standby signal to disturb central site network.
Connection value of the present invention, higher than cut off value, is just closed low pass circuit transfer of data in the time of the signal of lower frequency, avoids the trickle wrong inconvenience that transfer of data causes to user of turning off of fluctuating because of user side; Connection value and cut off value can be selected to set according to actual needs.
This inventive method is simple and practical, strong adaptability, and apparatus structure is simple, easy for installation, and improvement and installation cost are low, are worth promoting.
Brief description of the drawings
Above-mentioned is only the general introduction of technical solution of the present invention, and in order to better understand technological means of the present invention, below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Fig. 1 is the structural representation of a kind of cable television network low pass circuit of the present invention signal processing apparatus.
Embodiment
Embodiment 1
Shown in Fig. 1, the invention provides a kind of cable television network low pass circuit signal processing method, in the time that the voltage in low pass circuit is non-vanishing, set respectively connection value A and cut off value B, described connection value A is more than or equal to described cut off value B; If the low pass circuit signal value detecting is more than or equal to connection value A, low pass circuit is communicated with, and signal is transferred to cable television network from user side; If the low pass circuit signal value detecting is less than or equal to cut off value B, low pass circuit ground connection, signal cannot be transferred to cable television network; If the low pass circuit signal detecting is greater than cut off value B and is less than connection value A, it is constant that low pass circuit keeps its original connection status; In the time that the voltage in low pass circuit is zero, low pass circuit is communicated with cable television network.
Connection value A is preferably 14-18dBmV, and described cut off value B is preferably 1-15dBmV.
Embodiment 2
The difference part of the present embodiment and embodiment 1 is, described connection value A is 15dBmV, and described cut off value B is 12dBmV.
Embodiment 3
The present invention also provides a kind of cable television network low pass circuit signal processing apparatus that utilizes said method, comprise splitter 3, high pass filter 4, amplifier comparator 5 and change over switch 6, described low pass circuit comprises main line circuit 1 and branch circuit 2 two parts, near in the low pass circuit of signal output part, splitter 3 is installed, branch circuit 2 is provided with high pass filter 4 and amplifier comparator 5, main line circuit 1, branch circuit 2 and cable television network are connected with change over switch 6 respectively, and described change over switch is also connected with earthed circuit.
On described earthed circuit, be connected with load.
Described amplifier comparator 5 can be selected SGM8052XMS amplifier comparator.
The signal of user side output is after filter filters, and low frequency signal is transferred in low pass circuit, is divided into two parts through splitter 3, and the main signal that user side is uploaded of branch circuit detects, judgement.First, output signal is through high pass filter 4 on branch circuit 2, and high pass filter 4 filters out noise signal, in the present embodiment, described high pass filter is the high pass filter of 16MHz, the filtration of the signal that can be 5-16MHz by frequency, amount of information and the error rate of minimizing amplifier comparator.Signal enters amplifier comparator 5 and judges after high pass filter filters, in the time that the voltage in low pass circuit is non-vanishing, if when the signal detecting is more than or equal to 15dBmV, the contact R FC of change over switch is connected with contact R F1, main line circuit 1 is communicated with, and signal can be transferred to cable television network from user side; If when the signal detecting is less than or equal to 12dBmV, change over switch contact R F1 is connected with RF2, main line circuit ground, and signal can not be transferred to cable television network from user side; If when the signal detecting is greater than 12dBmV and is less than 15dBmV, low pass circuit keeps its original connection status constant; If the voltage in low pass circuit is zero, the contact R FC of change over switch 6 is connected with contact R F1, and low pass circuit is connected with cable television network.
This device can be set to the low pass of high pass, in the time higher frequency signals being detected, just opens low pass circuit, just closes low pass circuit in the time low frequency signals being detected, has avoided closing because of the mistake that opens by mistake that the trickle fluctuation of user side causes.
The above; it is only preferred embodiment of the present invention; not the present invention is done to any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (6)
1. cable television network low pass circuit signal processing method and a device, is characterized in that comprising the following steps:
In the time that the voltage in low pass circuit is non-vanishing,
Set respectively connection value A and cut off value B, described connection value A is more than or equal to described cut off value B;
If the low pass circuit signal value detecting is more than or equal to connection value A, low pass circuit is communicated with, and signal is transferred to cable television network from user side;
If the low pass circuit signal value detecting is less than or equal to cut off value B, low pass circuit ground connection, signal cannot be transferred to cable television network;
If the low pass circuit signal detecting is greater than cut off value B and is less than connection value A, it is constant that low pass circuit keeps its original connection status;
In the time that the voltage in low pass circuit is zero, low pass circuit is communicated with cable television network.
2. a kind of cable television network low pass circuit signal processing method according to claim 1 and device, is characterized in that: described connection value A is 14-18dBmV, described cut off value B is 1-15dBmV.
3. a kind of cable television network low pass circuit signal processing method according to claim 1 and device, is characterized in that: described connection value A is 15dBmV, described cut off value B is 12dBmV.
4. the cable television network low pass circuit signal processing apparatus of the method described in an application rights requirement 1, it is characterized in that: comprise splitter, high pass filter, amplifier comparator and change over switch, described low pass circuit comprises main line circuit and branch circuit two parts, near in the low pass circuit of signal output part, splitter is installed, branch circuit is provided with high pass filter and amplifier comparator, main line circuit, branch circuit and cable television network are connected with change over switch respectively, and described change over switch is also connected with earthed circuit.
5. a kind of cable television network low pass circuit signal processing apparatus according to claim 4, is characterized in that: described amplifier comparator is SGM8052XMS amplifier comparator.
6. a kind of cable television network low pass circuit signal processing apparatus according to claim 4, is characterized in that: on described earthed circuit, be connected with load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410341479.5A CN104092970A (en) | 2014-07-17 | 2014-07-17 | Low-pass circuit signal processing method and device for cable television network |
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| CN201410341479.5A CN104092970A (en) | 2014-07-17 | 2014-07-17 | Low-pass circuit signal processing method and device for cable television network |
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| CN101893910A (en) * | 2010-07-28 | 2010-11-24 | 苏州日月成科技有限公司 | Self-adaptive current mirror |
| CN102484749A (en) * | 2009-04-01 | 2012-05-30 | 戴维·兹尔勃贝格 | System for reducing noise in a catv home amplifier upstream path and a method thereof |
| US20140065979A1 (en) * | 2012-08-31 | 2014-03-06 | Broadcom Corporation | Dc offset cancellation |
| US8687736B1 (en) * | 2012-12-09 | 2014-04-01 | Phuong Huynh | Multi-band bandpass-sampling receiver |
| CN103777536A (en) * | 2014-01-22 | 2014-05-07 | 綦声波 | Power supply stable on-off control circuit and method used in sea surface floating device |
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2014
- 2014-07-17 CN CN201410341479.5A patent/CN104092970A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2894157Y (en) * | 2006-04-05 | 2007-04-25 | 李霖 | Wired TV network back transmission noise isolator |
| CN101371753A (en) * | 2008-10-08 | 2009-02-25 | 黄樟焱 | Safe drinking machine with mobile electric heating water cup |
| CN102484749A (en) * | 2009-04-01 | 2012-05-30 | 戴维·兹尔勃贝格 | System for reducing noise in a catv home amplifier upstream path and a method thereof |
| CN101893910A (en) * | 2010-07-28 | 2010-11-24 | 苏州日月成科技有限公司 | Self-adaptive current mirror |
| US20140065979A1 (en) * | 2012-08-31 | 2014-03-06 | Broadcom Corporation | Dc offset cancellation |
| US8687736B1 (en) * | 2012-12-09 | 2014-04-01 | Phuong Huynh | Multi-band bandpass-sampling receiver |
| CN103777536A (en) * | 2014-01-22 | 2014-05-07 | 綦声波 | Power supply stable on-off control circuit and method used in sea surface floating device |
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Application publication date: 20141008 |