CN219740460U - Filtering device for 2+1 system standby machine of ground digital television transmitter - Google Patents
Filtering device for 2+1 system standby machine of ground digital television transmitter Download PDFInfo
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- CN219740460U CN219740460U CN202320018237.7U CN202320018237U CN219740460U CN 219740460 U CN219740460 U CN 219740460U CN 202320018237 U CN202320018237 U CN 202320018237U CN 219740460 U CN219740460 U CN 219740460U
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Abstract
The utility model discloses a filtering device for a ground digital television transmitter 2+1 system standby machine, which mainly comprises a switch controller, four coaxial switches, a channel 1 filter, a channel 2 filter and four loads; when the standby machine uses the channel 1 for transmitting, the switch controller switches the filter device to a channel 1 filter working mode; when the standby machine uses the channel 2 for transmitting, the switch controller switches the filter device to a channel 2 filter working mode; when the standby machine transmits that the filter is not needed, the switch controller switches the filter device to the direct-connection working mode. The utility model can solve the problem that the existing 2+1 system standby machine of the ground digital television transmitter can not be provided with an independent filter, so that the standby machine can realize filter output under two channels, the frequency spectrum quality of the output signal of the transmitter is greatly improved, and the watching effect of the ground digital television program is improved.
Description
Technical Field
The utility model relates to a filter, in particular to a filter device for a 2+1 system standby machine of a ground digital television transmitter, which can enable the standby machine to realize filter output under two channels.
Background
The ground digital television system is one of digital television technologies, and is different from the current common digital television which transmits signals through an optical fiber network, and the ground digital television is in a wireless transmission mode. The television program signal source is amplified to a power level of tens or hundreds of watts by the transmitter, and is transmitted out through the antenna arranged at the top of the television tower, so that a user can watch television programs by using the television or the handheld terminal supporting the terrestrial digital television function.
The frequency resource of the ground digital television program is from 13 channels (center frequency point 474 MHz) to 36 channels (center frequency point 698 MHz), each channel occupies 8MHz of bandwidth, each channel can transmit 8 sets of standard definition television programs or 4 sets of high definition television programs, and each television station has at least 2 channels. A single transmitter equipped with a filter can only operate on the channel to which the filter corresponds and the remaining channels cannot operate. In view of the requirement of safe broadcasting, in principle, each channel needs to be equipped with two transmitters, namely a so-called ground digital television transmitter 1+1 system, wherein one is a host and the other is a standby, and in actual operation, the two transmitters are mutually active and standby, and when one of the two transmitters is damaged, the other can rapidly work, so that long-time broadcasting interruption is avoided. The system is characterized in that the system is limited by different conditions among areas, not all stations adopt a 1+1 system, part of stations adopt a 2+1 system, namely, 2 transmitter hosts of different channels are provided with 1 shared standby machine, and the standby machine is required to have the capacity of simultaneously operating 2 channels, so that independent filters cannot be provided, the spectrum quality of signals transmitted under the condition is poor, a plurality of harmonic clutters exist, the use of frequency resources of surrounding areas is interfered, and the watching effect of television programs is influenced.
Therefore, a novel filtering device needs to be researched and implemented so as to adapt to the characteristics of dual-channel operation of the standby machine, and the device can switch between two channels for operation and has higher popularization and application values.
Disclosure of Invention
The utility model aims to: the utility model aims to provide a filtering device which is used for a 2+1 system standby machine of a ground digital television transmitter, has double-channel working capacity and can be used by switching between 2 channels according to requirements.
The technical scheme is as follows: a filtering device for a ground digital television transmitter 2+1 system standby machine comprises a switch controller, four coaxial switches K1, K2, K3, K4, a channel 1 filter, a channel 2 filter, a load 1, a load 2, a load 3 and a load 4; the four coaxial switches all have 4 interfaces A, B, C, D, the channel 1 filter has 2 interfaces 1 and 2, and the channel 2 filter has 2 interfaces I, II; the coaxial switch is connected with the channel 1 filter, the channel 2 filter and the four loads; the interface A of the coaxial switch K1 and the interface C of the coaxial switch K4 are suspended, the interface B of the coaxial switch K1 is connected with the interface B of the coaxial switch K2, the interface C of the coaxial switch K1 is connected with the load 1, and the interface D of the coaxial switch K1 is connected with the interface 1 of the channel 1 filter; the interface A of the coaxial switch K2 is connected with the load 2, the interface C of the coaxial switch K2 is connected with the interface A of the coaxial switch K3, and the interface D of the coaxial switch K2 is connected with the interface 2 of the channel 1 filter; the interface B of the coaxial switch K3 is connected with the interface B of the coaxial switch K4, the interface C of the coaxial switch K3 is connected with the load 3, and the interface D of the coaxial switch K3 is connected with the interface I of the channel 2 filter; the interface A of the coaxial switch K4 is connected with the load 4, and the interface D of the coaxial switch K4 is connected with the interface II of the channel 2 filter.
Further, the on state inside the coaxial switch can be judged according to two curved indication lines on the surface of the coaxial switch; the conducting states inside the coaxial switch comprise a state 1 and a state 2, wherein the state 1 is that A and B are conducted, C and D are conducted, A and C, D are not conducted, B and C, D are not conducted, the state 2 is that A and D are conducted, B and C are conducted, A and B, C are not conducted, and D and B, C are not conducted.
Further, when the standby machine uses the channel 1 for transmitting, the switch controller switches the filter device to the working mode of the channel 1 filter, and the conducting states inside the four coaxial switches are respectively: the coaxial switch K1 is in state 2, the coaxial switch K2 is in state 1, the coaxial switch K3 is in state 1, and the coaxial switch K4 is in state 2.
Further, when the standby machine uses the channel 2 for transmitting, the switch controller switches the filter device to the working mode of the channel 2 filter, and the conducting states inside the four coaxial switches are respectively: the coaxial switch K1 is in state 1, the coaxial switch K2 is in state 2, the coaxial switch K3 is in state 2, and the coaxial switch K4 is in state 1.
Further, when the standby machine transmits that the filter is not needed, the switch controller switches the filter device to a direct working mode, and the conducting states inside the four coaxial switches are respectively as follows: the coaxial switch K1 is in state 1, the coaxial switch K2 is in state 2, the coaxial switch K3 is in state 1, and the coaxial switch K4 is in state 2.
Further, the on state inside the coaxial switch is controlled by a switch controller, and the coaxial switch is connected with the switch controller through a control line.
Further, the transmitter power signal is input from interface a of the coaxial switch K1 and output from interface C of the coaxial switch K4.
The filter device, when in use, is subject to the following:
(1) Before the working mode of the filter device is switched, the switch controller needs to ensure that the 2+1 system standby machine of the ground digital television transmitter is in a state of closing the transmitting power, and if the system standby machine is in a state of opening the transmitting power, the working mode of the filter device is not switched;
(2) Before switching the working mode of the filter device, the switch controller needs to confirm whether the channel of the new working mode of the filter device is consistent with the current working channel of the 2+1 system standby machine of the ground digital television transmitter, and if not, the transmitting power is not turned on;
(3) When the working mode of the filter device is switched, the switch controller firstly opens the unlocking switch, and after the switching is finished, the unlocking switch is necessarily closed again.
The beneficial effects are that: compared with the prior art, the utility model has the following remarkable advantages: the problem that the ground digital television transmitter 2+1 system standby machine cannot be provided with an independent filter is solved, so that the standby machine can realize filter output under two channels, and can also be switched to a direct working mode according to the actual demands of station users, thereby improving the signal spectrum quality and the program watching effect.
Drawings
FIG. 1 is a schematic diagram of a filtering device according to the present utility model;
fig. 2 is a schematic diagram of the channel 1 filter operation mode of the filtering device of the present utility model;
fig. 3 is a schematic diagram of the channel 2 filter operation mode of the filtering device of the present utility model;
FIG. 4 is a schematic diagram of a pass-through operation mode of the filtering device of the present utility model;
fig. 5 is a schematic block diagram of a switch controller of the filtering apparatus of the present utility model.
Detailed Description
The technical scheme of the utility model is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a filtering device for a ground digital television transmitter 2+1 system standby machine, which comprises a switch controller, four coaxial switches (K1, K2, K3, K4), a channel 1 filter, a channel 2 filter and four loads (load 1, load 2, load 3 and load 4).
The B ports of the coaxial switches K1 and K2 are connected, the B ports of the coaxial switches K3 and K4 are connected, the C ports of the coaxial switches K1 and K3 are connected with loads, the A ports of the coaxial switches K2 and K4 are connected with the loads, the D ports of the coaxial switches K1 and K2 are respectively connected with the two ends of the channel 1 filter, the D ports of the coaxial switches K3 and K4 are respectively connected with the two ends of the channel 2 filter, and the control of the four coaxial switches is completed by a switch controller and is connected through a control line.
Fig. 2 is a schematic diagram of a channel 1 filter operating mode of the filtering device according to the present utility model, when the standby machine uses channel 1 to transmit, the switch controller switches the filtering device to the channel 1 filter operating mode, and the conducting states inside the four coaxial switches are respectively: k1 is in state 2, K2 is in state 1, K3 is in state 1, and K4 is in state 2; it is apparent that the four in-line switch indication lines have been changed from fig. 1. The radio frequency signal of the transmitter is input from an interface A of a coaxial switch K1, at the moment, an A port and a D port of the coaxial switch K1 are in a conducting state, the signal enters a channel 1 filter along the D port of the coaxial switch K1, and enters a D port of a coaxial switch K2 after passing through the filter, at the moment, the D port and the C port of the coaxial switch K2 are in a conducting state, the signal enters an A port of a coaxial switch K3 along the C port of the coaxial switch K2, at the moment, the A port and the B port of the coaxial switch K3 are in a conducting state, the signal enters a B port of a coaxial switch K4 along the B port of the coaxial switch K3, at the moment, the B port and the C port of the coaxial switch K4 are in a conducting state, and the signal is output along the C port of the coaxial switch K4.
Fig. 3 is a schematic diagram of a channel 2 filter operating mode of the filtering device according to the present utility model, when the standby machine uses channel 2 to transmit, the switch controller switches the filtering device to the channel 2 filter operating mode, and the conducting states inside the four coaxial switches are respectively: k1 is in state 1, K2 is in state 2, K3 is in state 2, and K4 is in state 1; it is apparent that the four in-line switch indication lines have been changed from fig. 1 and 2. The radio frequency signal of the transmitter is input from an interface A of a coaxial switch K1, at the moment, an A port and a B port of the coaxial switch K1 are in a conducting state, the signal enters a B port of a coaxial switch K2 along a B port of the coaxial switch K1, at the moment, a B port and a C port of the coaxial switch K2 are in a conducting state, the signal enters an A port and a D port of the coaxial switch K3 along a C port of the coaxial switch K2, at the moment, the signal enters a channel 2 filter along a D port of the coaxial switch K3, enters a D port of a coaxial switch K4 after passing through the filter, at the moment, the D port and the C port of the coaxial switch K4 are in a conducting state, and the signal is output along a C port of the coaxial switch K4.
Fig. 4 is a schematic diagram of a through operation mode of the filtering device according to the present utility model, when the standby device does not need a filter, the switch controller switches the filtering device to the through operation mode, and the conducting states inside the four coaxial switches are respectively: k1 is in state 1, K2 is in state 2, K3 is in state 1, and K4 is in state 2; it is apparent that the four in-line switch indication lines have been changed from those of fig. 1, 2 and 3. The radio frequency signal of the transmitter is input from an interface A of a coaxial switch K1, at the moment, an A port and a B port of the coaxial switch K1 are in a conducting state, the signal enters a B port of a coaxial switch K2 along a B port of the coaxial switch K1, at the moment, a B port and a C port of the coaxial switch K2 are in a conducting state, the signal enters an A port of a coaxial switch K3 along a C port of the coaxial switch K2, at the moment, an A port and a B port of the coaxial switch K3 are in a conducting state, the signal enters a B port of a coaxial switch K4 along a B port of the coaxial switch K3, at the moment, a B port and a C port of the coaxial switch K4 are in a conducting state, and the signal is output along a C port of the coaxial switch K4.
Fig. 5 is a schematic block diagram of a switch controller of the filtering device of the present utility model, including a control switch, a logic conversion circuit, and a control line. The unlocking control switch belongs to a first safety in design, and is divided into an unlocking state and a locking state, other control switches do not work in the locking state, and only in the unlocking state, the other control switches can work normally. The channel 1 working switch, the channel 2 working switch and the direct-pass working switch are equivalent to a high-level effective single-pole single-throw switch, and after the logic control circuit receives the high level, logic analysis is carried out to convert high-level signals of three working modes into conduction state control signals corresponding to 4 coaxial switches, so that the function of controlling the conduction state of the coaxial switches is achieved.
The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several equivalent substitutions and obvious modifications can be made without departing from the spirit of the utility model, and the same should be considered to be within the scope of the utility model.
Claims (7)
1. The filtering device for the ground digital television transmitter 2+1 system standby machine is characterized by comprising a switch controller, four coaxial switches K1, K2, K3, K4, a channel 1 filter, a channel 2 filter, a load 1, a load 2, a load 3 and a load 4; the four coaxial switches all have 4 interfaces A, B, C, D, the channel 1 filter has 2 interfaces 1 and 2, and the channel 2 filter has 2 interfaces I, II; the coaxial switch is connected with the channel 1 filter, the channel 2 filter and the four loads; the interface A of the coaxial switch K1 and the interface C of the coaxial switch K4 are suspended, the interface B of the coaxial switch K1 is connected with the interface B of the coaxial switch K2, the interface C of the coaxial switch K1 is connected with the load 1, and the interface D of the coaxial switch K1 is connected with the interface 1 of the channel 1 filter; the interface A of the coaxial switch K2 is connected with the load 2, the interface C of the coaxial switch K2 is connected with the interface A of the coaxial switch K3, and the interface D of the coaxial switch K2 is connected with the interface 2 of the channel 1 filter; the interface B of the coaxial switch K3 is connected with the interface B of the coaxial switch K4, the interface C of the coaxial switch K3 is connected with the load 3, and the interface D of the coaxial switch K3 is connected with the interface I of the channel 2 filter; the interface A of the coaxial switch K4 is connected with the load 4, and the interface D of the coaxial switch K4 is connected with the interface II of the channel 2 filter.
2. The filtering device for a 2+1 system standby of a terrestrial digital television transmitter according to claim 1, wherein the conductive states inside the coaxial switch include a state 1 and a state 2, the state 1 being a conductive state a and B conductive state C and D conductive state a and C, D non-conductive state B and C, D non-conductive state 2 being a conductive state D conductive state B and C conductive state a and B, C non-conductive state D and B, C non-conductive state a.
3. The filtering device for a 2+1 system standby machine of a terrestrial digital television transmitter according to claim 2, wherein when the standby machine transmits using channel 1, the switch controller switches the filtering device to a channel 1 filter operation mode, and the conducting states inside the four coaxial switches are respectively: the coaxial switch K1 is in state 2, the coaxial switch K2 is in state 1, the coaxial switch K3 is in state 1, and the coaxial switch K4 is in state 2.
4. The filtering device for a 2+1 system standby of a terrestrial digital television transmitter according to claim 2, wherein when the standby uses channel 2 for transmission, the switch controller switches the filtering device to a channel 2 filter operation mode, and the conducting states inside the four coaxial switches are respectively: the coaxial switch K1 is in state 1, the coaxial switch K2 is in state 2, the coaxial switch K3 is in state 2, and the coaxial switch K4 is in state 1.
5. The filtering device for a 2+1 system standby machine of a terrestrial digital television transmitter according to claim 2, wherein when the standby machine transmits without a filter, the filtering device is switched to a direct-connection working mode by the switch controller, and the conducting states inside the four coaxial switches are respectively: the coaxial switch K1 is in state 1, the coaxial switch K2 is in state 2, the coaxial switch K3 is in state 1, and the coaxial switch K4 is in state 2.
6. The filtering device for a 2+1 system standby of a terrestrial digital television transmitter according to claim 1, wherein the on state inside the coaxial switch is controlled by a switch controller, and the coaxial switch is connected with the switch controller through a control line.
7. The filtering device for a 2+1 system backup of a terrestrial digital television transmitter according to claim 1, wherein the transmitter power signal is input from interface a of coaxial switch K1 and output from interface C of coaxial switch K4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320018237.7U CN219740460U (en) | 2023-01-05 | 2023-01-05 | Filtering device for 2+1 system standby machine of ground digital television transmitter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320018237.7U CN219740460U (en) | 2023-01-05 | 2023-01-05 | Filtering device for 2+1 system standby machine of ground digital television transmitter |
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| Publication Number | Publication Date |
|---|---|
| CN219740460U true CN219740460U (en) | 2023-09-22 |
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| CN202320018237.7U Active CN219740460U (en) | 2023-01-05 | 2023-01-05 | Filtering device for 2+1 system standby machine of ground digital television transmitter |
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| CN (1) | CN219740460U (en) |
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- 2023-01-05 CN CN202320018237.7U patent/CN219740460U/en active Active
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