Program switching system

Abstract

The utility model discloses a program switching system, which comprises a first signal source, a second signal source, a signal output selector and a first signal source change-over switch, the first signal source is connected with a first input network port in the first signal source change-over switch and inputs a first signal to the first signal source change-over switch; the second signal source is connected with a second input network port in the first signal source change-over switch and inputs a second signal to the first signal source change-over switch; the first signal source and the second signal source are respectively connected with the signal output selector and respectively input a first signal and a second signal; the signal output selector is connected with a third input network port in the first information source change-over switch and inputs a signal selection level to the first information source change-over switch; and the output network port in the first information source change-over switch is communicated with the input network port in the first information source change-over switch corresponding to the signal selection level for signal output. By means of the system, automatic and efficient switching can be achieved when signals are abnormal.

Description

TECHNICAL FIELD

[0001] The utility model relates to digital television technical field especially relates to a program switching system. BACKGROUND

[0002] The ground digital television transmitting system is an important part of modern broadcast television transmission, and its stability and reliability are directly related to the normal broadcast of television signals.

[0003] At present, the existing ground digital television transmitting system cannot automatically switch to the standby equipment when the program signal is abnormal, and these abnormal conditions usually need to rely on the alarm to remind or manually switch after being found by the staff. This manual intervention mode has many problems: on the one hand, the operation time of manual switching is long, and it is difficult to restore the normal television signal broadcast in a short time; on the other hand, once the alarm fails or fails to find the alarm information in time, the disposal time of abnormal conditions will be greatly prolonged, thereby causing safety hazards in program broadcast. UTILITY MODEL CONTENT

[0004] The utility model provides a program switching system to solve the problem that the existing ground digital television transmitting system cannot automatically switch to the standby equipment when the program signal is abnormal, and causes safety hazards in program broadcast.

[0005] According to one aspect of the utility model, a program switching system is provided, which comprises: a first signal source, a second signal source, a signal output selector, a first signal source switching switch;

[0006] The first signal source is connected with the first input network port in the first signal source switching switch, and inputs the first signal to the first signal source switching switch;

[0007] The second signal source is connected with the second input network port in the first signal source switching switch, and inputs the second signal to the first signal source switching switch;

[0008] The first signal source and the second signal source are respectively connected with the signal output selector, and input the first signal and the second signal respectively;

[0009] The signal output selector is connected with the third input network port in the first signal source switching switch, and inputs the signal selection level to the first signal source switching switch;

[0010] The output network port in the first signal source switching switch and the input network port in the first signal source switching switch corresponding to the signal selection level establish communication for signal output, and the input network port in the first signal source switching switch is the first input network port or the second input network port.

[0011] The utility model provides a kind of communication system for application upgrade, comprising: first signal source, second signal source, signal output selector, first signal source switch;First signal source is connected in the first input network interface of first signal source switch, and first signal source switch is input first signal;Second signal source is connected in the second input network interface of first signal source switch, and first signal source switch is input second signal;First signal source and second signal source are connected with signal output selector respectively, and first signal and second signal are input respectively;Signal output selector is connected in the third input network interface of first signal source switch, and signal selection level is input to first signal source switch;The output network interface in first signal source switch and the input network interface in first signal source switch corresponding to signal selection level establish communication to carry out signal output, and the input network interface in first signal source switch is first input network interface or second input network interface.It realizes timely, accurate determination to abnormal signal by the system, and when signal appears abnormal, it can realize automatic, efficient switching, ensure the safe broadcast of program.

[0012] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, and is not used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0014] Figure 1 The structural diagram of the program switching system provided by the utility model is shown;

[0015] Figure 2 The structural diagram of another program switching system provided by the utility model is shown. DETAILED DESCRIPTION

[0016] In order to make those skilled in the art better understand the utility model scheme, the technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the utility model.

[0017] It should be noted that the terms "first", "second", and the like in the description and in the claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0018] It should be noted that the existing ground digital television transmission system cannot automatically switch to the standby device when the program signal is abnormal, and needs to rely on the alarm to remind or manually switch after manual discovery. This way is difficult to restore normal television signal broadcast in a short time, and once the alarm fails or fails to discover the alarm information in time, the disposal time of the abnormal condition will be greatly prolonged, thereby causing safety hazards in program broadcasting.

[0019] Based on this, the utility model embodiment provides a program switching system, Figure 1 The structure diagram of the program switching system provided by the utility model is shown, and the embodiment can be applicable to the case of switching to the standby device when the program signal is abnormal (such as black field, color bar and interruption). As shown in the figure, Figure 1 The program switching system includes: a first signal source 1, a second signal source 2, a signal output selector 3, a first signal source switching switch 4; the first signal source 1 is connected with the first input network port 41 in the first signal source switching switch 4, inputs the first signal to the first signal source switching switch 4; the second signal source 2 is connected with the second input network port 42 in the first signal source switching switch 4, inputs the second signal to the first signal source switching switch 4; the first signal source 1 and the second signal source 2 are connected with the signal output selector 3 respectively and input the first signal and the second signal respectively; the signal output selector 3 is connected with the third input network port 43 in the first signal source switching switch 4 and inputs the signal selection level to the first signal source switching switch 4; the output network port 44 in the first signal source switching switch 4 and the input network port in the first signal source switching switch 4 corresponding to the signal selection level establish communication for signal output, and the input network port in the first signal source switching switch 4 is the first input network port 41 or the second input network port 42.

[0020] The signal source can be a switch, which is used to receive audio and video signals and convert the signals into program signals suitable for ground digital television transmission system; the first signal source 1 can be considered as a main signal source; the first signal can be understood as a main program signal; the second signal source 2 can be considered as a backup signal source, which is used as a backup signal source when the first signal source 1 is abnormal; the second signal can be understood as a backup program signal. The signal output selector 3 can be considered as a device for converting, comparing and selecting signals, which is used to automatically exclude the abnormal images such as black field and color bar existing in the program. The first signal source switching switch 4 can be understood as a main device for multiple selection and switching of signals.

[0021] In the embodiment, the first signal source 1 and the second signal source 2 can respectively receive the signals to be transmitted through cables, optical fibers and / or electromagnetic waves, and modulate and encode the signals to improve the audio and video quality and make the signals suitable for transmission in the ground digital television transmission system. The first signal source 1 and the second signal source 2 are respectively connected to the signal output selector 3 and input the first signal and the second signal to the signal output selector 3 respectively. The signal output selector 3 can support processing signals in multiple audio and video encoding formats, and use feature extraction and comparison technology to select signals, output signal selection level according to the selection, and transmit the signal selection level to the third input network port 43 in the first signal source switching switch 4. The first signal source switching switch 4 receives the first signal through the first signal source 1 connected to the first input network port 41, receives the second signal through the second signal source 2 connected to the second input network port 42, and establishes communication between the output network port 44 in the first signal source switching switch 4 and the first input network port 41 or the second input network port 42 according to the signal selection level received by the third input network port 43, so as to ensure the output of normal signals. Exemplarily, the input network port can be a wireless network interface, an Ethernet interface, an optical fiber interface or other network interfaces, which are not limited in the embodiment.

[0022] Exemplarily, when the signal output selector 3 judges that the first signal is normal through comparison, the signal selection level 0 is output; when the signal output selector 3 judges that the first signal is abnormal and the second signal is normal through comparison, the signal selection level 1 is output.

[0023] Exemplarily, the first signal and the second signal can be audio-video signals, and the comparison process can be first aligning audio-video features, and then separately comparing video and audio. The comparison content can include audio time delay, video time delay, audio content consistency, video content consistency, audio PID consistency and video PID consistency between the first signal and the second signal. If there is an abnormality such as audio-video time delay greater than a preset threshold, video content inconsistency or video PID inconsistency, etc., the audio-video signal can be converted into a 0-1 sequence to identify whether the first signal and the second signal have image layer faults such as black screen, color bar or static frame, etc. If it is identified that the first signal does not have the above image layer faults, it is judged that the first signal is normal, and if it is identified that the first signal has the above image layer faults, it is judged that the first signal is abnormal, and the same scheme can be used to judge whether the second signal is normal.

[0024] Exemplarily, when the first signal and the second signal are audio-video signals, the comparison process can also be directly converting the audio-video signal into a 0-1 sequence to identify whether the first signal and the second signal have image layer faults such as black screen, color bar or static frame, etc.

[0025] Exemplarily, when the first signal and the second signal are audio-video signals, the comparison process can also be directly converting the audio-video signal into a 0-1 sequence to identify whether the first signal and the second signal have image layer faults such as black screen, color bar or static frame, etc.

[0026] Optionally, the board card in the first source switching switch 4 can use a code stream layer state monitoring technology to support real-time monitoring of code stream state, TR101 290 error and signal PID bandwidth; the first source switching switch 4 can also use a switching scheduling software of a browser and server architecture mode to complete the monitoring of the code stream layer state and the signal switching.

[0027] Exemplarily, when the first source switching switch 4 determines that the first source has a TR101 290 error, the output network port 44 in the first source switching switch 4 can be connected with the second input network port 42 to output the second signal.

[0028] It can be understood that if the first signal has an image layer abnormality, when the first signal returns to normal, the signal output selector 3 can transmit a signal selection level of 0 to the first source switching switch 4, so that the output network port in the first source switching switch 4 is switched back to be connected with the first input network port 41 to output the first signal. If the first signal has a code stream layer abnormality, when the first signal returns to normal, the first source switching switch 4 can switch back the output network port to be connected with the first input network port 41 to output the first signal.

[0029] The utility model provides a program switching system, include: first signal source 1, second signal source 2, signal output selector 3, first signal source switching switch 4, first signal source 1 is connected with the first input network mouth 41 in first signal source switching switch 4, and the first signal is input to first signal source switching switch 4, second signal source 2 is connected with the second input network mouth 42 in first signal source switching switch 4, and the second signal is input to first signal source switching switch 4, first signal source 1 and second signal source 2 are connected with signal output selector 3 respectively, and first signal and second signal are input respectively, signal output selector 3 is connected with the third input network mouth 43 in first signal source switching switch 4, and signal selection level is input to first signal source switching switch 4, and the output network mouth 44 in first signal source switching switch 4 and the input network mouth in first signal source switching switch 4 corresponding to signal selection level establish intercommunication and carry out signal output, and the input network mouth in first signal source switching switch 4 is first input network mouth 41 or second input network mouth 42, through the system, the timely, accurate judgement of abnormal signal is realized, and when the signal is abnormal, automatic, efficient switching can be realized, and the safe broadcast of program is ensured.

[0030] As the first alternative embodiment of the embodiment, on the basis of the above embodiment, the signal output selector 3 includes a signal converter 31 and a signal selector 32; the first signal and the second signal are audio and video signals; the signal converter 31 includes a fourth input network mouth 311, a fifth input network mouth 312 and a first output network mouth 313; the signal converter 31 receives the first signal through the fourth input network mouth 311 and receives the second signal through the fifth input network mouth 312; the signal converter 31 is used for converting each audio and video signal into a 0-1 sequence respectively, and transmitting the 0-1 sequence to the signal selector 32 through the first output network mouth 313; the signal selector 32 includes a sixth input network mouth 321 and a second output network mouth 322; the signal selector 32 receives the 0-1 sequence through the sixth input network mouth 321; the signal selector 32 is used for switching the level through the 0-1 sequence to obtain a signal selection level, and transmitting the signal selection level to the first signal source switching switch 4 through the second output network mouth 322.

[0031] Among them, the fourth input network mouth 311 and the fifth input network mouth 312 can be the network mouth provided by the probe, and the probe can be the AVMatch probe.

[0032] In this embodiment, the fourth input port 311 and the fifth input port 312 of the signal converter 31 receive the first signal and the second signal respectively, and the signal converter 31 converts the first signal and the second signal into 0-1 sequences respectively. The 0-1 sequences corresponding to the first signal and the second signal are transmitted to the signal selector 32 through the first output port 313. After receiving the 0-1 sequence through the sixth input port 321, the signal selector 32 switches the level according to the 0-1 sequence to obtain the signal selection level. The specific implementation of this method is as follows: first, it is determined whether the two sequences are synchronized. After finding that they are synchronized, the subsequent sequences of the two sequences are partially extracted to obtain two partial sequences. The two partial sequences are compared to determine whether there is only one sequence with all values ​​of 0 or all values ​​of 1 in the two partial sequences. The sequence with all values ​​of 0 can indicate that the signal corresponding to the sequence has a black field or a still frame phenomenon, and the sequence with all values ​​of 1 can indicate that the signal corresponding to the sequence has a color bar or a still frame phenomenon. If there exists a sequence with only one value that is all 0 or all 1, the level is switched according to the comparison result; if there is no sequence with only one value that is all 0 or all 1, the time delay between the two partial sequences is then calculated. If the time delay is less than a threshold value, the first signal is considered to be consistent with the second signal, and the level is switched according to the comparison result, i.e., the level can be switched to 0; if the time delay is greater than a threshold value, the first signal is considered to be inconsistent with the second signal, and an alarm message can be issued.

[0033] For example, if the values ​​in the partial sequence corresponding to the first signal are all 0, and the partial sequence corresponding to the second signal contains both 0 and 1, the level can be switched from 0 to 1 and used as the signal selection level. If the values ​​in the partial sequence corresponding to the first signal recover to contain both 0 and 1, and the time delay between the two partial sequences is less than a threshold value, the level can be switched from 1 to 0 and used as the signal selection level. If the partial sequence corresponding to the first signal contains both 0 and 1, and the values ​​in the partial sequence corresponding to the second signal are all 1, the level can be kept at 0 and used as the signal selection level.

[0034] The above-described technical solution in this embodiment converts the signal into a 0-1 sequence through the signal converter 31, and switches the level according to the comparison result of the 0-1 sequence, thereby enabling automatic signal switching when an anomaly occurs at the image level, improving the speed and accuracy of handling anomalies, and thus ensuring the safety of program playback.

[0035] As a second alternative embodiment of the present embodiment, the program switching system further comprises a first switch 5; an output network port 44 in the first source switching switch 4 is connected with an input network port 51 in the first switch 5, and the first switch 5 is inputted with a first to-be-transmitted signal, the first to-be-transmitted signal being the first signal or the second signal; the first switch 5 is connected with a multiplexer 6 in the ground digital transmission system, and transmits the first to-be-transmitted signal to the multiplexer 6.

[0036] In the present embodiment, the first switch 5 can be considered as a main path switch, which is used to receive the first to-be-transmitted signal outputted by the first source switching switch 4 and transmit the first to-be-transmitted signal to the ground digital transmission system. The first to-be-transmitted signal can be understood as the signal outputted by the first source switching switch 4, which has the requirement of being transmitted by the ground digital transmission system.

[0037] In the present embodiment, the output network port 44 in the first source switching switch 4 is connected with the input network port 51 in the first switch 5 to receive the first to-be-transmitted signal, and the first to-be-transmitted signal is transmitted from the first switch 5 to the multiplexer 6 in the ground digital transmission system through a feeder or an optical fiber, so as to improve the reliability of the signal transmitted by the ground digital transmission system and reduce the security risks existing in the program broadcasting.

[0038] As one of the implementation manners, the output network port 44 in the first source switching switch 4 comprises a third output network port 441 and a fourth output network port 442; the first to-be-transmitted signal is transmitted to the first switch 5 through the third output network port 441; the first to-be-transmitted signal is transmitted to the first switch 5 through the fourth output network port 442 when the third output network port 441 fails; the input network port 51 in the first switch 5 comprises a tenth input network port 511 and an eleventh input network port 512; the first to-be-transmitted signal transmitted by the third output network port 441 is received by the tenth input network port 511 in the first switch 5; the first to-be-transmitted signal transmitted by the fourth output network port 442 is received by the eleventh input network port 512 in the first switch 5.

[0039] In the embodiment, the third output network interface 441 and the fourth output network interface 442 are primary and standby to each other, and can both establish communication with the input network interface in the first source switching switch 4 when receiving the signal selection level. The third output network interface is connected with the tenth input network interface 511 in the first switch 5, and the fourth output network interface 442 is connected with the eleventh input network interface 512 in the first switch 5. For example, the first to-be-transmitted signal can be transmitted by default from the third output network interface 441 to the eleventh input network interface 512, and when the third output network interface 441 fails, the first to-be-transmitted signal is transmitted from the fourth output network interface 442 to the eleventh input network interface 512, so as to ensure that the first switch 5 can receive the first to-be-transmitted signal, thereby effectively promoting the execution of subsequent transmission logic.

[0040] As a third optional embodiment of the embodiment, the program switching system further comprises a second source switching switch 7. The second source switching switch 7 comprises a seventh input network interface 71, an eighth input network interface 72 and a ninth input network interface 73. The first signal source 1 is connected with the seventh input network interface 71 in the second source switching switch 7, and inputs the first signal to the second source switching switch 7. The second signal source 2 is connected with the eighth input network interface 72 in the second source switching switch 7, and inputs the second signal to the second source switching switch 7. The signal output selector 3 is connected with the ninth input network interface 73 in the second source switching switch 7, and inputs the signal selection level to the second source switching switch 7. An output network interface 74 in the second source switching switch 7 establishes communication with the input network interface corresponding to the signal selection level in the second source switching switch 7, and outputs a signal when the first source switching switch 4 fails. The input network interface in the second source switching switch 7 is the seventh input network interface 71 or the eighth input network interface 72.

[0041] In the embodiment, the second source switching switch 7 is a standby switch of the first source switching switch 4, and the second source switching switch 7 is similar in structure to the first source switching switch 4. The first signal is received by the seventh input network interface 71, the second signal is received by the eighth input network interface 72, and the signal selection level is received by the ninth input network interface 73, so as to ensure that when the first source switching switch 4 fails, such as when the input network interface cannot receive a signal or all output network interfaces cannot output a signal, the execution of subsequent transmission logic can be effectively promoted.

[0042] As one of the implementation manners, the program switching system further comprises a second switch 8. The output network interface 74 in the second source switching switch 7 is connected with an input network interface 81 in the second switch 8, and inputs a second to-be-transmitted signal to the second switch 8. The second to-be-transmitted signal is the first signal or the second signal. The second switch 8 is connected with the multiplexer 6 in the ground digital transmission system, and transmits the second to-be-transmitted signal to the multiplexer 6.

[0043] The second to-be-transmitted signal can be understood as a signal output by the second source switching switch 7, which has a requirement for being transmitted by the ground digital transmission system.

[0044] In the embodiment, the second switch 8 is a backup switch of the first switch 5. The second switch 8 is connected with the second source switching switch 7 to receive the second to-be-transmitted signal output by the second source switching switch 7, and the second switch 8 is connected with the multiplexer 6 in the ground digital transmission system, and the second to-be-transmitted signal can be transmitted from the second switch 8 to the multiplexer 6 through a feeder or an optical fiber, etc., so as to avoid mutual influence with the first to-be-transmitted signal, and enable the second to-be-transmitted signal to be reliably and accurately transmitted to the ground digital transmission system.

[0045] Optionally, the output network port 74 in the second source switching switch 7 comprises a fifth output network port 741 and a sixth output network port 742; the second to-be-transmitted signal is transmitted to the second switch 8 through the fifth output network port 741 when all the output network ports 44 in the first source switching switch 4 are faulty; the second to-be-transmitted signal is transmitted to the second switch 8 through the sixth output network port 742 when both the output network ports 44 and the fifth output network port 741 in the first source switching switch 4 are faulty; the input network port 81 in the second switch 8 comprises a twelfth input network port 811 and a thirteenth input network port 812; the second to-be-transmitted signal transmitted by the fifth output network port 741 is received through the twelfth input network port 811; the second to-be-transmitted signal transmitted by the sixth output network port 742 is received through the thirteenth input network port 812.

[0046] In the embodiment, the fifth output network port 741 and the sixth output network port 742 are mutually primary and backup, and can both establish communication with the input network port in the second source switching switch 7 when receiving a signal selection level. The fifth output network port 741 is connected with the twelfth input network port 811 in the second switch 8, and the sixth output network port 742 is connected with the thirteenth input network port 812 in the second switch 8. For example, the second to-be-transmitted signal can be transmitted from the fifth output network port 741 to the twelfth input network port 811 by default when the first source switching switch 4 is faulty, and the second to-be-transmitted signal can be transmitted from the sixth output network port 742 to the thirteenth input network port 812 when the fifth output network port 741 is faulty, so as to ensure that the second switch 8 can receive the second to-be-transmitted signal, thereby effectively promoting subsequent transmission logic execution.

[0047] Figure 2 Another program switching system provided by the utility model is shown in the structure diagram. As shown in Figure 2As shown, the program switching system comprises a first signal source 1, a second signal source 2, a signal output selector 3, a first signal source switching switch 4, a first switch 5, a second signal source switching switch 7, and a second switch 8. The signal output selector 3 comprises a signal converter 31 and a signal selector 32.

[0048] The first signal source 1 is connected with a first input network port 41 in the first signal source switching switch 4, a fourth input network port 311 in the signal converter 31, and a seventh input network port 71 in the second signal source switching switch 7 respectively. The second signal source 2 is connected with a second input network port 42 in the first signal source switching switch 4, a fifth input network port 312 in the signal converter 31, and an eighth input network port 72 in the second signal source switching switch 7 respectively.

[0049] A first output network port 313 in the signal converter 31 is connected with a sixth input network port 321 in the signal selector 32. A second output network port 322 in the signal selector 32 is connected with a third input network port 43 in the first signal source switching switch 4 and a ninth input network port 73 in the second signal source switching switch 7 respectively.

[0050] An output network port 44 in the first signal source switching switch 4 comprises a third output network port 441 and a fourth output network port 442. An input network port 51 in the first switch 5 comprises a tenth input network port 511 and an eleventh input network port 512. The third output network port 441 is connected with the tenth input network port 511, and the fourth output network port 442 is connected with the eleventh input network port 512. The first switch 5 is connected with a multiplexer 6 in a ground digital transmission system.

[0051] An output network port 74 in the second signal source switching switch 7 comprises a fifth output network port 741 and a sixth output network port 742. An input network port 81 in the second switch 8 comprises a twelfth input network port 811 and a thirteenth input network port 812. The fifth output network port 741 is connected with the twelfth input network port 811, and the sixth output network port 742 is connected with the thirteenth input network port 812. The second switch 8 is connected with the multiplexer 6 in the ground digital transmission system.

[0052] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present application can be executed in parallel, in sequence, or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which are not limited herein.

[0053] The specific embodiments described above do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A program switching system characterized by comprising: include: First signal source, second signal source, signal output selector, first signal source switching switch; The first signal source is connected to the first input network port in the first signal source switching switch, and inputs a first signal to the first signal source switching switch; The second signal source is connected to the second input network port in the first signal source switch, and inputs the second signal to the first signal source switch; The first signal source and the second signal source are respectively connected to the signal output selector and respectively input the first signal and the second signal; The signal output selector is connected to the third input network port 43 in the first signal source switching switch, and inputs a signal selection level to the first signal source switching switch; The output network port of the first source switching switch establishes a connection with the input network port of the first source switching switch corresponding to the signal selection level to output a signal. The input network port of the first source switching switch is either the first input network port or the second input network port.

2. The system of claim 1, wherein, The signal output selector includes a signal converter and a signal selector; the first signal and the second signal are audio and video signals; The signal converter includes: a fourth input network port, a fifth input network port, and a first output network port; The signal converter receives the first signal through the fourth input network port and the second signal through the fifth input network port; The signal converter is used to convert each of the audio and video signals into a 0-1 sequence, and transmit the 0-1 sequence to the signal selector through the first output network port; The signal selector includes: a sixth input network port and a second output network port; The signal selector receives the 0-1 sequence through the sixth input network port; The signal selector is used to switch the level through the 0-1 sequence to obtain the signal selection level, and transmit the signal selection level to the first signal source switching switch through the second output network port.

3. The system of claim 1, wherein, Also includes: First switch; The output port of the first signal source switching switch is connected to the input port of the first switch to input a first signal to be transmitted to the first switch. The first signal to be transmitted is either the first signal or the second signal. The first switch is connected to a multiplexer in the terrestrial digital transmission system and transmits the first signal to be transmitted to the multiplexer.

4. The system of claim 1, wherein, Also includes: Second source switching switch; The second source switching switch includes: a seventh input network port, an eighth input network port, and a ninth input network port; The first signal source is connected to the seventh input network port of the second signal source switch, and inputs the first signal to the second signal source switch; The second signal source is connected to the eighth input network port in the second signal source switch, and inputs the second signal to the second signal source switch; The signal output selector is connected to the ninth input network port in the second source switching switch, and inputs the signal selection level to the second source switching switch; The output network port in the second source switching switch is connected with the input network port in the second source switching switch corresponding to the signal selection level, and outputs a signal when the first source switching switch fails, and the input network port in the second source switching switch is the seventh input network port or the eighth input network port.

5. The system of claim 4, wherein, Further comprising: A second switch; The output network port in the second source switching switch is connected with the input network port in the second switch, and inputs a second to-be-transmitted signal to the second switch, and the second to-be-transmitted signal is the first signal or the second signal; The second switch is connected with a multiplexer in a ground digital transmission system, and transmits the second to-be-transmitted signal to the multiplexer.

6. The system of claim 3, wherein, The output network port in the first source switching switch comprises a third output network port and a fourth output network port; The first to-be-transmitted signal is transmitted to the first switch through the third output network port; The first to-be-transmitted signal is transmitted to the first switch through the fourth output network port when the third output network port fails; The input network port in the first switch comprises a tenth input network port and an eleventh input network port; The first to-be-transmitted signal transmitted by the third output network port is received through the tenth input network port in the first switch; The first to-be-transmitted signal transmitted by the fourth output network port is received through the eleventh input network port in the first switch.

7. The system of claim 5, wherein, The output network port in the second source switching switch comprises a fifth output network port and a sixth output network port; The second to-be-transmitted signal is transmitted to the second switch through the fifth output network port when all the output network ports in the first source switching switch fail; The second to-be-transmitted signal is transmitted to the second switch through the sixth output network port when all the output network ports in the first source switching switch and the fifth output network port fail; The input network port in the second switch comprises a twelfth input network port and a thirteenth input network port; The second to-be-transmitted signal transmitted by the fifth output network port is received through the twelfth input network port; The second to-be-transmitted signal transmitted by the sixth output network port is received through the thirteenth input network port.

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