CN112689102A - Differential video transmission device and method - Google Patents
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Abstract
The invention relates to the technical field of video transmission, and provides a differential video transmission device and a differential video transmission method.A characteristic extraction module is arranged to directly carry out characteristic acquisition on a differential video signal input by an AHD input port to obtain an abnormal detection signal, and the abnormal detection is carried out at the beginning of signal input, so that the generation (fault generation) of the abnormal signal can be quickly responded and fault repair is carried out; the dual path of the path selection module matched with the fault restoration circuit (the operational amplifier module + the signal selection module + the decoding module) and the normal output circuit (the decoding module) is set, when the signal is abnormal, the dual path is switched to the fault restoration circuit, and the single-end signal (the positive signal or the negative signal) is amplified to the preset amplitude value by utilizing the signal amplification function of the operational amplifier module, so that the working requirement of the decoding module is met, the normal transmission of the differential video signal is maintained, and the reliability of the differential video signal output system is further improved.
Description
Technical Field
The present invention relates to the field of video transmission technologies, and in particular, to a differential video transmission apparatus and method.
Background
The AHD (analoghi definition, analog high resolution) technology can realize reliable transmission of ultra-long distance (500 m) high definition video signals on the existing analog transmission line; the method adopts advanced Y/C signal separation and analog filtering technology, can effectively reduce color noise of a high-frequency region, and has better image reducibility. Compared with the traditional high-definition simulation product, the quality of the monitoring image of the AHD has qualitative leap and improvement, and the highest definition can be equal to the full high-definition level of 1080P of the network high definition.
The high definition of the digital signal requires a chip for serialization and deserialization, and the chip is high in price and has high requirements on transmission line impedance shielding. Simulation high definition AHD is with low costs (ordinary coaxial line can) because of the transmission pencil, and the image quality reaches the high definition level, at present in the whole car reduce cost's era, and 360 panoramas and the vehicle-mounted camera rate of utilization of simulation high definition AHD are more and more high.
However, when the AHD signal is differentially transmitted, once one of the transmission lines fails, the image cannot be normally displayed, and the image can be displayed again after the line is repaired.
Therefore, the prior art is in need of further improvement.
Disclosure of Invention
The invention provides a differential video transmission device and a differential video transmission method, which solve the technical problems of poor fault tolerance and slow fault repair of the conventional AHD video transmission line.
In order to solve the technical problems, the invention provides a differential video transmission device, which comprises a control module, a feature extraction module, a path selection module, a signal selection module and a fault isolation module which are connected with the control module, and an operational amplifier module and a decoding module which are respectively connected with the path selection module and the signal selection module; the fault isolation module is respectively connected with the path selection module and the decoding module;
the feature extraction module is connected with the AHD input port and used for extracting features of the differential video signals to obtain abnormal detection signals;
the control module is used for generating a corresponding gating signal according to the abnormal detection signal, controlling signal gating of the path selection module and the signal selection module, generating an isolation signal and sending the isolation signal to the fault isolation module;
the fault isolation module is used for responding to the isolation signal to isolate a fault line;
the path selection module is connected with an AHD input port and used for responding to the gating signal and controlling the differential video signal to be output to the operational amplifier module or the decoding module;
the operational amplifier module is used for amplifying the positive electrode signal or the negative electrode signal of the differential video signal according to a preset fault repair strategy;
the signal selection module is used for responding to the gating signal, gating the output end of the operational amplifier module and outputting a corresponding single-ended signal to the decoding module;
the decoding module is used for receiving the differential video signal or the single-ended signal and decoding.
The basic scheme is provided with a feature extraction module, the feature extraction module is used for directly carrying out feature acquisition on the differential video signal input by the AHD input port to obtain an abnormal detection signal, the abnormal detection is carried out at the beginning of signal input, and the generation (fault generation) of the abnormal signal can be quickly responded and fault repair is carried out; the dual path of the path selection module matched with the fault restoration loop (the operational amplifier module + the signal selection module + the decoding module) and the normal output loop (the decoding module) is set, the dual path can be switched to the fault restoration loop when the signal is abnormal, and the single-end signal (the positive signal or the negative signal) is amplified to the preset amplitude value by utilizing the signal amplification function of the operational amplifier module, so that the working requirement of the decoding module is met, the normal transmission of the video signal is realized, and the reliability of the differential video signal output system is further improved.
In further embodiments, the path selection module comprises a first channel selection module and a second channel selection module; the first channel selection module and the second channel selection module are respectively connected with the positive input end and the negative input end of the AHD input port; the first channel selection module comprises a first output end and a second output end which are respectively connected with the operational amplifier module and the decoding module; the second channel selection module comprises a third output end and a fourth output end which are respectively connected with the operational amplifier module and the decoding module;
when the control module judges that the negative signal is abnormal according to the abnormal detection signal, the signal output of the second channel selection module is closed, a first gating signal is generated, and the first channel selection module is controlled to gate a first output end;
when the control module judges that the positive pole signal is abnormal according to the abnormal detection signal, the control module closes the signal output of the first channel selection module, generates the first gating signal and controls the second channel selection module to gate a third output end;
and when the control module judges that the differential video signal is normal according to the abnormal detection signal, generating the first gating signal, controlling the first channel selection module to gate the second output end and controlling the second channel selection module to gate the fourth output end.
The scheme sets up a path selection module corresponding to a first channel selection module and a second channel selection module of positive signal input and negative signal input respectively, output of two paths of signals in the differential video signals is adjusted in a targeted manner, when one path of signals is abnormal (the positive signal is abnormal or the negative signal is abnormal), signal output is closed, the other path of signals is output normally, and therefore when a certain branch line has a fault, the fault repairing and recovering signals are output timely.
In a further embodiment, the signal selection module comprises a first input terminal and a second input terminal independent of each other; when the positive pole signal/the negative pole signal is abnormal, the control module generates a second gating signal and controls the signal selection module to gate the second input end/the first input end.
In a further embodiment, the operational amplifier module is provided with an in-phase amplifier circuit and an anti-phase amplifier circuit, and the in-phase amplifier circuit is connected with the first output end and the first input end; the inverting amplifying circuit is connected with the third output end and the second input end;
the in-phase amplifying circuit is used for amplifying the positive pole signal in phase;
the inverting amplifying circuit is used for inverting and amplifying the negative electrode signal.
The scheme comprises an in-phase amplifying circuit and an anti-phase amplifying circuit operational amplifier module, can be compatible with a positive signal and a negative signal, and can amplify the positive signal/the negative signal in an in-phase manner/in an anti-phase manner according to a preset amplitude value when a signal fault occurs to obtain the positive signal meeting the decoding condition of a decoding module, so that the positive signal can be directly input into the decoding module for analysis.
In a further embodiment, the fault isolation module is a switch circuit, a control end of the switch circuit is connected to the control module, and a signal input end of the switch circuit is connected to the second output end and the fourth output end;
and when the control end receives the isolation signal, the signal input end and the grounding end are conducted, and the signal connection between the decoding module and the path selection module is disconnected.
The fault isolation module with the switching characteristic is designed, the signal input end is arranged at a connection point of the path selection module and the decoding module, and when a signal fault occurs, the signal input end and the grounding end are conducted in response to an isolation signal, so that the second output end of the first channel selection module and the fourth output end of the first channel selection module are grounded, signal interference of a fault line to the decoding module is isolated, and a reference ground is provided for a single-ended signal output by the signal selection module.
The invention also provides a differential video transmission method, which adopts the differential video transmission device and comprises the following steps:
s1, acquiring the differential video signal and judging whether the differential video signal is abnormal or not;
and S2, isolating the fault line when the difference video signal is judged to be abnormal, controlling the normal line to recover and output according to a preset fault repair strategy, and sending prompt information of the abnormal difference video signal.
The basic scheme is that the fault repairing system is provided with a corresponding fault repairing method, the state of the differential video signal is detected in real time, the fault line is isolated at the first time after the abnormal signal transmission is detected, and the normal line is controlled to recover and output according to the set fault repairing strategy, so that the differential video signal can still be normally transmitted after the signal fault occurs, and the reliability of the differential video signal output system is further improved.
In a further embodiment, the step S1 includes:
s11, acquiring the difference video signals in the timing time and the theoretical synchronous signal quantity;
s12, calculating the first synchronous signal quantity of the positive signals and the second synchronous signal quantity of the negative signals in the differential video signals within the timing time;
and S13, comparing the number of the first synchronous signals and the number of the second synchronous signals respectively by taking the number of the theoretical synchronous signals as a standard, and if the comparison difference is larger than a preset threshold, representing that the signals are abnormal.
The scheme takes the number of theoretical synchronous signals in the timing time as a standard, and can clearly judge whether the line fault problem of signal abnormality exists by acquiring the number of first synchronous signals and the number of second synchronous signals respectively corresponding to the positive signals and the negative signals, calculating the difference value and comparing the difference value with the threshold value.
In a further embodiment, the step S2 includes:
s21a, when the negative pole signal in the differential video signal is judged to be abnormal, carrying out in-phase amplification on the input positive pole signal to a preset amplitude value, and inputting the amplified single-ended signal to a first input end of a signal selection module;
and S22a, disconnecting the output of the negative pole signal and sending out prompt information of the abnormality of the negative pole signal.
In another embodiment, the step S2 includes:
s21b, when the positive pole signal in the differential video signal is judged to be abnormal, inverting and amplifying the input negative pole signal to a preset amplitude value, and inputting the amplified single-ended signal to a second input end of the signal selection module;
and S22b, disconnecting the output of the positive pole signal and sending out prompt information of the abnormality of the positive pole signal.
In still another embodiment, the step S2 includes:
s21c, when the positive pole signal and the negative pole signal are judged to be abnormal at the same time, the output of the positive pole signal and the negative pole signal in the differential video signal is cut off;
and S22c, sending out prompt information that the positive electrode signal and the negative electrode signal are abnormal simultaneously.
According to the scheme, corresponding fault coping strategies are designed for different abnormal conditions of the differential video signals, when only one path of signal is abnormal (a positive signal or a negative signal is abnormal), the negative signal/the positive signal which is still normally output in the other path is subjected to reverse-phase amplification/in-phase amplification until the remaining single-ended signal can meet the preset amplitude of a decoding module, so that the video signal is stably output; when the positive electrode signal and the negative electrode signal are abnormal simultaneously, the output of the positive electrode signal and the negative electrode signal in the differential video signal is directly cut off, and unnecessary resource waste and secondary circuit damage are reduced; by using the signal abnormity prompt, the staff can be reminded to repair the fault in time.
In a further embodiment, the present invention further comprises the steps of:
and S3, when the difference video signal is not judged to be abnormal, controlling the difference video signal to be directly output to a decoding module for decoding.
Drawings
Fig. 1 is a system framework diagram of a differential video transmission apparatus according to embodiment 1 of the present invention;
fig. 2 is a hardware circuit diagram of fig. 1 provided in embodiment 1 of the present invention;
fig. 3 is a flowchart of a differential video transmission method according to embodiment 2 of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which are given solely for the purpose of illustration and are not to be construed as limitations of the invention, including the drawings which are incorporated herein by reference and for illustration only and are not to be construed as limitations of the invention, since many variations thereof are possible without departing from the spirit and scope of the invention.
Example 1
The reference numbers in the drawings in the present embodiment include: the system comprises a control module 1, a feature extraction module 2, a path selection module 3, a first channel selection module 31 and a second channel selection module 32; the device comprises a signal selection module 4, a fault isolation module 5, an operational amplifier module 6 and a decoding module 7.
As shown in fig. 1 and fig. 2, the differential video transmission device provided in the embodiment of the present invention includes a control module 1, a feature extraction module 2, a path selection module 3, a signal selection module 4, a fault isolation module 5 connected to the control module 1, and an operational amplifier module 6 and a decoding module 7 respectively connected to the path selection module 3 and the signal selection module 4; the fault isolation module 5 is respectively connected with the path selection module 3 and the decoding module 7;
the feature extraction module 2 is connected to the AHD input port, and is configured to perform feature extraction on the differential video signal to obtain an anomaly detection signal.
In this embodiment, the AHD input ports include AHD + (positive input) and AHD- (negative input).
The feature extraction module 2 may select the video synchronization signal extraction module to extract the synchronization signal, and may also select the shaping filtering module to convert the differential video signal into a level signal, so as to obtain the anomaly detection signal. Wherein, a group of video synchronization signal extraction modules or shaping filter modules are respectively arranged aiming at each path of signal input. In the present embodiment, preferably, two sets of video synchronization signal extraction modules U1 and U2 constitute the feature extraction module 2.
The control module 1 is used for generating a corresponding gating signal according to the abnormal detection signal, controlling signal gating of the path selection module 3 and the signal selection module 4, generating an isolation signal and sending the isolation signal to the fault isolation module 5;
in the present embodiment, the control module 1 is preferably an MCU.
The fault isolation module 5 is used for responding to the isolation signal to isolate a fault line;
the path selection module 3 is connected with an AHD input port and used for responding to gating signals and controlling differential video signals to be output to the operational amplifier module 6 or the decoding module 7;
the operational amplifier module 6 is used for amplifying a positive electrode signal or a negative electrode signal of the differential video signal according to a preset fault repair strategy;
the signal selection module 4 is used for responding to the gating signal, gating the output end of the operational amplifier module 6 and outputting the corresponding single-ended signal to the decoding module 7;
the decoding module 7 is used for receiving the differential video signal or the single-ended signal and decoding.
In a further embodiment, the path selection module 3 comprises a first channel selection module 31 and a second channel selection module 32; the first channel selection module 31 and the second channel selection module 32 are respectively connected with the positive input end AHD + and the negative input end AHD-of the AHD input port; the first channel selection module 31 comprises a first output end (OUT1) and a second output end (OUT2) which are respectively connected with the operational amplifier module 6 and the decoding module 7; the second channel selection module 32 comprises a third output end (OUT1) and a fourth output end (OUT2) which are respectively connected with the operational amplifier module 6 and the decoding module 7;
when the control module 1 judges that the negative signal is abnormal according to the abnormal detection signal, the signal output of the second channel selection module 32 is closed, a first gating signal is generated, and the first channel selection module 31 is controlled to gate a first output end;
when the control module 1 judges that the positive signal is abnormal according to the abnormal detection signal, the signal output of the first channel selection module 31 is closed, a first gating signal is generated, and the second channel selection module 32 is controlled to gate a third output end;
when the control module 1 determines that the differential video signal is normal according to the abnormal detection signal, it generates a first gating signal, controls the first channel selection module 31 to gate the second output terminal, and controls the second channel selection module 32 to gate the fourth output terminal.
IN a further embodiment, the signal selection block 4 comprises a first input (the IN1 port IN fig. 2) and a second input (the IN2 port IN fig. 2) independent of each other; when the positive pole signal/the negative pole signal is abnormal, the control module 1 generates a second gating signal, and the control signal selection module 4 gates the second input end/the first input end.
In this embodiment, a first channel selection module 31 and a second channel selection module 32 respectively corresponding to the positive signal input and the negative signal input are provided to establish a path selection module 3, output of two paths of signals in the differential video signal is adjusted in a targeted manner, when one path of signal is abnormal (the positive signal is abnormal or the negative signal is abnormal), the signal output is closed, and the other path of signal is normal, so that when a certain branch line has a fault, the fault recovery signal is timely output.
In a further embodiment, the operational amplifier module 6 is provided with an in-phase amplifier circuit and an anti-phase amplifier circuit, wherein the in-phase amplifier circuit is connected with the first output end and the first input end; the inverting amplifying circuit is connected with the third output end and the second input end;
the in-phase amplifying circuit is used for amplifying the positive electrode signal in phase;
the inverting amplification circuit is used for inverting and amplifying the negative electrode signal.
The operational amplifier module 6 including the in-phase amplifier circuit and the reverse-phase amplifier circuit is provided in this embodiment, and is compatible with the positive signal and the negative signal, and when a signal fault occurs, the in-phase amplifier/reverse-phase amplifier is performed on the positive signal/negative signal to obtain the positive signal satisfying the decoding condition of the decoding module 7, so that the positive signal can be directly input to the decoding module 7 for analysis.
In this embodiment, the amplification factor of the operational amplifier module 6 is determined according to the ratio of the signal amplitude required for normal decoding by the decoding module 7 to the single-ended signal (positive signal or negative signal in the differential video signal) at that time. The amplification factor is preferably 2 times in this embodiment, so that the single-ended signal can reach the amplitude of a conventional differential video signal.
In a further embodiment, the fault isolation module 5 is a switch circuit, and a control terminal thereof is connected to the control module 1, and a signal input terminal thereof is connected to the second output terminal and the fourth output terminal.
The fault isolation module 5 includes a switching tube Q1, a switching tube Q2, and resistors R1 to R4, in this embodiment, the switching tube Q1 is preferably an N-channel MOS tube, and the switching tube Q2 is preferably an NPN-type triode.
The drain D of the switching tube Q1 is connected as a signal input end between the fourth output end and the decoding module 7, and also connected between the second output end and the decoding module 7 through a resistor R5, the source S is grounded, the gate G is connected to a power supply (12V is selected in this embodiment) through a resistor R1, one end of the resistor R2 is connected to the gate G, and the other end is connected to the source S;
the collector of the switch tube Q2 is connected with the gate G of the switch tube Q1, the emitter is grounded, the base is connected to the control module 1 as the control end through the resistor R3, one end of the resistor R2 is connected with the base, and the other end is connected with the emitter.
When the control end receives a high level, the switch tube Q2 is switched on, and the switch tube Q1 is switched off; when the control terminal receives a low level, the switch tube Q2 is closed, and the switch tube Q1 is turned on.
When the control terminal receives the isolation signal, the signal input terminal and the ground terminal are connected, and the signal connection between the decoding module 7 and the path selection module 3 is disconnected.
In the embodiment, the fault isolation module 5 with the switching characteristic is designed, the signal input end is arranged at a connection point between the path selection module 3 and the decoding module 7, and when a signal fault occurs, the signal input end and the ground end are conducted in response to an isolation signal, so that the second output end of the first channel selection module 31 and the fourth output end of the first channel selection module 31 are grounded, signal interference of a fault line to the decoding module 7 is isolated, and a reference ground is provided for a single-ended signal output by the signal selection module 4.
The embodiment of the invention is provided with a feature extraction module 2, directly performs feature acquisition on the differential video signal input by the AHD input port to obtain an abnormal detection signal, performs abnormal detection at the beginning of signal input, and can quickly react on the generation (fault generation) of the abnormal signal and perform fault repair; the path selection module 3 is arranged to cooperate with a double path of a fault restoration loop (the operational amplifier module 6+ the signal selection module 4+ the decoding module 7) and a normal output loop (the decoding module 7), when a signal is abnormal, the dual path is switched to the fault restoration loop, and a single-ended signal (an anode signal or a cathode signal) is amplified to a preset amplitude value by using a signal amplification function of the operational amplifier module 6, so that the working requirement of the decoding module 7 is met, the normal transmission of a video signal is maintained, and the reliability of a differential video signal transmission system is further improved.
Example 2
The present invention further provides a differential video transmission method, which uses the differential video transmission device provided in embodiment 1, and with reference to fig. 3, includes steps S1 to S3:
s1, acquiring the differential video signal and judging whether the differential video signal is abnormal or not, wherein the method comprises the following steps of S11-S13:
s11, acquiring differential video signals within the timing time t and the theoretical synchronous signal number M0;
s12, calculating the first synchronous signal number M1 of positive signals and the second synchronous signal number M2 of negative signals in the differential video signals within the timing time t;
s13, comparing the first number M1 of synchronization signals and the second number M2 of synchronization signals with the theoretical number M0 of synchronization signals as a standard, wherein if the difference is greater than a predetermined threshold M, it represents a signal abnormality, which is specifically shown in table 1 below:
| serial number | M1 | M2 | |
| 1 | M0-m<M1 | M0-m<M2 | AHD + Normal, AHD- |
| 2 | M0-m<M1 | M0-m>M2 | AHD + Normal, AHD-abnormal |
| 3 | M0-m>M1 | M0-m<M2 | AHD + abnormal, AHD- |
| 4 | M0-m>M1 | M0-m>M2 | AHD + Exception, AHD-Exception |
TABLE 1
The theoretical number M0 of synchronization signals is the product of the timing time t and the frequency of the differential video signal.
In the embodiment, the theoretical number of synchronization signals M0 in the timing time t is taken as a standard, and the first number of synchronization signals M1 and the second number of synchronization signals M2 respectively corresponding to the positive signal and the negative signal are obtained, and the difference value calculation and the threshold value comparison are performed, so that whether a line fault problem of signal abnormality exists can be clearly determined.
And S2, isolating the fault line when the differential video signal is judged to be abnormal, controlling the normal line to recover and output according to a preset fault repairing strategy, and sending prompt information of the differential video signal abnormality. The method specifically comprises the following conditions:
in one embodiment, step S2 includes steps S21 a-S22 a:
s21a, when the cathode signal in the differential video signal is judged to be abnormal, the input cathode signal is amplified in phase to a preset amplitude value, and the amplified single-ended signal is input to the first input end of the signal selection module 4;
and S22a, disconnecting the output of the negative pole signal and sending out prompting information of the negative pole signal abnormity.
In another embodiment, step S2 includes steps S21 b-S22 b:
s21b, when the positive pole signal in the differential video signal is judged to be abnormal, inverting and amplifying the input negative pole signal to a preset amplitude value, and inputting the amplified single-ended signal to the second input end of the signal selection module 4;
and S22b, disconnecting the output of the positive pole signal and sending out the prompting information of the abnormal positive pole signal.
In yet another embodiment, step S2 includes steps S21 c-S22 c:
s21c, when the positive pole signal and the negative pole signal are judged to be abnormal simultaneously, the output of the positive pole signal and the negative pole signal in the differential video signal is cut off;
and S22c, sending out prompt information that the positive pole signal and the negative pole signal are abnormal simultaneously.
In the embodiment, corresponding fault coping strategies are designed for different abnormal conditions of the differential video signals, when only one path of signal is abnormal (a positive signal or a negative signal is abnormal), the other path of negative signal/positive signal which is still normally output is subjected to reverse-phase amplification/in-phase amplification until the remaining single-ended signal can meet the preset amplitude of the decoding module 7, so that the video signal is stably output; when the positive electrode signal and the negative electrode signal are abnormal simultaneously, the output of the positive electrode signal and the negative electrode signal in the differential video signal is directly cut off, and unnecessary resource waste and secondary circuit damage are reduced; by using the signal abnormity prompt, the staff can be reminded to repair the fault in time.
And S3, when the difference video signal is not judged to be abnormal, controlling the difference video signal to be directly output to the decoding module 7 for decoding.
The embodiment of the invention configures a corresponding fault repairing method for the fault repairing system, detects the state of the differential video signal in real time, isolates the fault line at the first time after detecting the abnormal signal transmission, and controls the normal line to recover and output according to the set fault repairing strategy, so that the differential video signal can still be normally transmitted after the signal fault occurs, and the reliability of the differential video signal output system is further improved.
Referring to fig. 2 and 3, in the present embodiment, the operation process of the fault repairing system is as follows:
the feature extraction module 2 is provided with two video synchronization signal extraction modules U1 and U2, which are respectively connected to AHD + and AHD-, and perform acquisition of positive signals and negative signals (namely, anomaly detection signals) and upload the signals to the MCU (which are respectively uploaded to the counting ports MCU _ TI1 and MCU _ TI2 of the MCU), and perform statistics by using the external counting function of the MCU to obtain the first synchronization signal number M1 and the second synchronization signal number M2.
At this time, an abnormality determination is performed, the theoretical number of synchronization signals M0 is compared with the first number of synchronization signals M1 and the second number of synchronization signals M2, and whether an abnormality occurs is determined according to the magnitude relationship between the comparison difference and the preset threshold M (see table 1 for details).
When AHD + and AHD-are both in normal state (i.e. the differential video signal is normal)
The MCU enables the first channel selection module 31 and the second channel selection module 32, so that the first channel selection module 31 and the second channel selection module 32 enter a working state.
Subsequently, the MCU outputs a first gating signal according to the normal judgment of the differential video signal, and controls the first channel selection module 31 and the second channel selection module 32 to gate to OUT2 (i.e. the second output terminal and the fourth output terminal), so that the positive signal and the negative signal of the differential video signal are directly accessed to the VINP terminal and the VINN terminal of the decoding module 7 for decoding; and outputs high level to the control end MCU _ CRT of the fault isolation module 5, and controls the switch tube Q1 to be in a closed state.
② when AHD + is in normal state and AHD-is in abnormal state (namely positive pole signal is normal and negative pole signal is abnormal)
The MCU enables the first channel selection module 31, outputs a first gating signal to control the first channel selection module 31 to gate to OUT1 (i.e. the first output end), and outputs the positive signal to the in-phase amplifier circuit of the operational amplifier module 6; turning off the enabling of the second channel selection module 32, that is, turning off the signal output of the second channel selection module 32; and sending out prompt information of abnormal negative pole signals.
The in-phase amplification circuit amplifies the positive electrode signal in phase to a forward single-ended signal with a preset amplitude according to a preset fault repair strategy, and then outputs the signal to the signal selection module 4.
The signal selection module 4 at this time, because the IN1 port is gated to receive the forward single-ended signal by receiving the second gating signal (gating the first input end at this time) sent by the MCU, outputs the forward single-ended signal to the decoding module 7U4 for decoding.
Meanwhile, the MCU also outputs a high level to the control terminal MCU _ CRT of the fault isolation module 5, controls the switching tube Q2 to be in an off state, grounds the second output terminal and the fourth output terminal, and provides a reference ground to the single-ended signal.
③ when AHD + is in abnormal state and AHD-is in normal state (namely, the positive pole signal is abnormal and the negative pole signal is normal)
The MCU enables the second channel selection module 32, outputs the first gate signal to control the second channel selection module 32U7 to gate to OUT1 (i.e. the third output end), and outputs the negative signal to the inverting amplifier circuit of the operational amplifier module 6; turning off the enabling of the first channel selection module 31, that is, turning off the signal output of the first channel selection module 31; and sending out prompt information of the abnormal positive pole signal.
The inverting amplification circuit performs inverting amplification on the negative electrode signal to a forward single-ended signal with a preset amplitude according to a preset fault repairing strategy, and then outputs the signal to the signal selection module 4.
The signal selection module 4 at this time, because the IN2 port is gated to receive the forward single-ended signal by receiving the second gating signal (gating the second input terminal at this time) sent by the MCU, outputs the forward single-ended signal to the decoding module 7 for decoding.
Meanwhile, the MCU also outputs a high level to the control terminal MCU _ CRT of the fault isolation module 5, controls the switching tube Q2 to be in an off state, grounds the second output terminal and the fourth output terminal, and provides a reference ground to the single-ended signal.
Fourthly, when both AHD and AHD are in abnormal state (namely, both the positive pole signal and the negative pole signal are abnormal)
The MCU turns off the enabling of the first channel selection module 31 and the second channel selection module 32, and sends out a prompt message that the positive signal and the negative signal are abnormal at the same time.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (11)
1. A differential video transmission apparatus, characterized in that: the system comprises a control module, a feature extraction module, a path selection module, a signal selection module and a fault isolation module which are connected with the control module, and an operational amplifier module and a decoding module which are respectively connected with the path selection module and the signal selection module; the fault isolation module is respectively connected with the path selection module and the decoding module;
the feature extraction module is connected with the AHD input port and used for extracting features of the differential video signals to obtain abnormal detection signals;
the control module is used for generating a corresponding gating signal according to the abnormal detection signal, controlling signal gating of the path selection module and the signal selection module, generating an isolation signal and sending the isolation signal to the fault isolation module;
the fault isolation module is used for responding to the isolation signal to isolate a fault line;
the path selection module is connected with an AHD input port and used for responding to the gating signal and controlling the differential video signal to be output to the operational amplifier module or the decoding module;
the operational amplifier module is used for amplifying the positive electrode signal or the negative electrode signal of the differential video signal according to a preset fault repair strategy;
the signal selection module is used for responding to the gating signal, gating the output end of the operational amplifier module and outputting a corresponding single-ended signal to the decoding module;
the decoding module is used for receiving the differential video signal or the single-ended signal and decoding.
2. The differential video transmission apparatus of claim 1, wherein: the path selection module comprises a first channel selection module and a second channel selection module; the first channel selection module and the second channel selection module are respectively connected with the positive input end and the negative input end of the AHD input port; the first channel selection module comprises a first output end and a second output end which are respectively connected with the operational amplifier module and the decoding module; the second channel selection module comprises a third output end and a fourth output end which are respectively connected with the operational amplifier module and the decoding module;
when the control module judges that the negative signal is abnormal according to the abnormal detection signal, the signal output of the second channel selection module is closed, a first gating signal is generated, and the first channel selection module is controlled to gate a first output end;
when the control module judges that the positive pole signal is abnormal according to the abnormal detection signal, the control module closes the signal output of the first channel selection module, generates the first gating signal and controls the second channel selection module to gate a third output end;
and when the control module judges that the differential video signal is normal according to the abnormal detection signal, generating the first gating signal, controlling the first channel selection module to gate the second output end and controlling the second channel selection module to gate the fourth output end.
3. The differential video transmission apparatus according to claim 2, wherein: the signal selection module comprises a first input end and a second input end which are mutually independent; when the positive pole signal/the negative pole signal is abnormal, the control module generates a second gating signal and controls the signal selection module to gate the second input end/the first input end.
4. A differential video transmission apparatus according to claim 3, wherein: the operational amplifier module is provided with an in-phase amplifier circuit and an anti-phase amplifier circuit, and the in-phase amplifier circuit is connected with the first output end and the first input end; the inverting amplifying circuit is connected with the third output end and the second input end;
the in-phase amplifying circuit is used for amplifying the positive pole signal in phase;
the inverting amplifying circuit is used for inverting and amplifying the negative electrode signal.
5. The differential video transmission apparatus according to claim 2, wherein: the fault isolation module is a switch circuit, the control end of the fault isolation module is connected with the control module, and the signal input end of the fault isolation module is connected with the second output end and the fourth output end;
and when the control end receives the isolation signal, the signal input end and the grounding end are conducted, and the signal connection between the decoding module and the path selection module is disconnected.
6. A differential video transmission method using the differential video transmission device as claimed in claims 1 to 5, comprising the steps of:
s1, acquiring the differential video signal and judging whether the differential video signal is abnormal or not;
and S2, isolating the fault line when the difference video signal is judged to be abnormal, controlling the normal line to recover and output according to a preset fault repair strategy, and sending prompt information of the abnormal difference video signal.
7. The differential video transmission method according to claim 6, wherein the step S1 includes:
s11, acquiring the difference video signals in the timing time and the theoretical synchronous signal quantity;
s12, calculating the first synchronous signal quantity of the positive signals and the second synchronous signal quantity of the negative signals in the differential video signals within the timing time;
and S13, comparing the number of the first synchronous signals and the number of the second synchronous signals respectively by taking the number of the theoretical synchronous signals as a standard, and if the comparison difference is larger than a preset threshold, representing that the signals are abnormal.
8. The differential video transmission method according to claim 6, wherein the step S2 includes:
s21a, when the negative pole signal in the differential video signal is judged to be abnormal, carrying out in-phase amplification on the input positive pole signal to a preset amplitude value, and inputting the amplified single-ended signal to a first input end of a signal selection module;
and S22a, disconnecting the output of the negative pole signal and sending out prompt information of the abnormality of the negative pole signal.
9. The differential video transmission method according to claim 6, wherein the step S2 includes:
s21b, when the positive pole signal in the differential video signal is judged to be abnormal, inverting and amplifying the input negative pole signal to a preset amplitude value, and inputting the amplified single-ended signal to a second input end of the signal selection module;
and S22b, disconnecting the output of the positive pole signal and sending out prompt information of the abnormality of the positive pole signal.
10. The differential video transmission method according to claim 6, wherein said step S2 includes:
s21c, when the positive pole signal and the negative pole signal are judged to be abnormal at the same time, the output of the positive pole signal and the negative pole signal in the differential video signal is cut off;
and S22c, sending out prompt information that the positive electrode signal and the negative electrode signal are abnormal simultaneously.
11. The differential video transmission method of claim 6, further comprising the steps of:
and S3, when the difference video signal is not judged to be abnormal, controlling the difference video signal to be directly output to a decoding module for decoding.
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