CN105657411A - TV and TV feed detection method - Google Patents
TV and TV feed detection method Download PDFInfo
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- CN105657411A CN105657411A CN201410723301.7A CN201410723301A CN105657411A CN 105657411 A CN105657411 A CN 105657411A CN 201410723301 A CN201410723301 A CN 201410723301A CN 105657411 A CN105657411 A CN 105657411A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
Abstract
The invention discloses a TV feed detection method. The TV feed detection method comprises the following steps of, by a TV, obtaining a polarization voltage transmitted by a satellite tuner; detecting the obtained polarization voltage and a DiSEqC communication command through a detection circuit; and if the detected polarization voltage and the DiSEqC communication command are normal, judging that a power supply circuit is normal. The invention also discloses a TV. After entering a detection mode, the obtained polarization voltage and the DiSEqC communication command are detected by the detection circuit, and the power supply circuit is judged to be normal when the polarization voltage and the DiSEqC communication command are detected to be in normal conditions, so that the TV can detect the state of the power supply circuit at the interior thereof automatically. Accordingly, the workflow of human detection is simplified, the operation time is saved, and the user experience is further improved.
Description
Technical field
The present invention relates to power supply technique field, relate in particular to a kind of television set and television set feed detection method.
Background technology
The mainboard receiving circuit of satellite television is divided into three parts conventionally: satellite television tuner, channel demodulationDevice and satellite power supply circuits. User is using in the process of satellite television, when feed circuit occur abnormal,Or outside satellite earth antenna short circuit or open circuit while causing feed circuit abnormal, user cannot be watched and defendStar TV, therefore whether just factory, in the time producing satellite television, need to detect these three modular circuit functionsOften. Existing detection method detects by special external application equipment simply, thereby detection efficiency is low.
Foregoing only, for auxiliary understanding technical scheme of the present invention, does not represent and admits that foregoing isPrior art.
Summary of the invention
Main purpose of the present invention is to provide a kind of television set and television set feed detection method, is intended to letterChange flow process and the operating time of manual detection.
For achieving the above object, the invention provides a kind of television set feed detection method, described television set bagDraw together satellite low noise block, channel demodulator, MCU and power supply circuits, described television set feed detection methodComprise the following steps:
Obtain polarizing voltage and DiSEqC communications command that satellite low noise block is carried, described polarizing voltage isControlled the voltage of power supply circuits output by MCU, described DiSEqC communications command is to control letter by MCUThe order of road demodulator output;
The polarizing voltage of obtaining and DiSEqC communications command are detected, if detect polarizing voltage andDiSEqC communications command is all normal, judges that power supply circuits are normal.
Preferably, described the polarizing voltage of obtaining and DiSEqC communications command are detected, if detectPolarizing voltage and DiSEqC communications command all normal, judge that the normal step of power supply circuits comprises:
The polarizing voltage of obtaining is detected, if polarizing voltage in preset range, control channel solutionAdjust device output DiSEqC communications command;
Detect by the DiSEqC communications command of power supply circuits and satellite low noise block output, if by power supply electricityThe DiSEqC communications command of road and satellite low noise block output, in default scope, is just judging power supply circuitsOften.
Preferably, the described step that the polarizing voltage of obtaining is detected comprises:
By testing circuit, the polarizing voltage of obtaining is carried out to attenuation processing and obtain the polarization electricity after attenuation processingPress;
Detect the polarizing voltage after attenuation processing and judge whether in preset range.
Preferably, the described step that the DiSEqC communications command obtaining is detected comprises:
The voltage signal of described DiSEqC communication command is amplified to processing;
Resolve and obtain data message through amplifying voltage signal after treatment;
Whether the data message that detection is obtained is in preset range.
Whether the data message that preferably, described detection is obtained also comprises after the step of preset range:
Send the LNB status command of DiSEqC inquiry satellite antenna;
What reception satellite low noise block returned replys resolving information, and judges according to the resolving information of replying receivingWhether the line status of satellite antenna is normal;
Reply resolving information if receive, and it is correct to reply resolving information, judges the circuit of satellite antennaState is normal, and in on-screen menu, shows that the circuit of satellite antenna is normal.
In addition, for achieving the above object, the present invention also provides a kind of television set, comprise channel demodulator,Power supply circuits and MCU, one end of described channel demodulator is electrically connected with satellite low noise block, channel demodulationThe other end of device is connected with MCU, and the two ends of power supply circuits connect respectively satellite low noise block and channel demodulationDevice, described television set also comprises testing circuit, input and the satellite low noise block of described testing circuit are electrically connectedConnect, and output is electrically connected with channel demodulator and MCU respectively, described testing circuit is used for satelliteTuner carry polarizing voltage and DiSEqC communications command detect, if detect polarizing voltage andDiSEqC communications command is all normal, judges that power supply circuits are normal, and described MCU is used for controlling power supply electricityRoad output polarization voltage and control channel demodulator output DiSEqC communications command.
Preferably, described testing circuit comprises attenuator circuit and amplifying circuit, the input of described attenuator circuitEnd is electrically connected with described satellite low noise block, and the output of described attenuator circuit is electrically connected with described MCU, instituteState attenuator circuit, for obtaining polarizing voltage and the polarizing voltage of obtaining being carried out to attenuation processing and decayedPolarizing voltage after treatment; The input of described amplifying circuit is electrically connected with described satellite low noise block, described inThe output of amplifying circuit is electrically connected with described channel demodulator, and described amplifying circuit is used for obtaining DiSEqCCommunication command also amplifies processing to the voltage signal of the DiSEqC communication command obtaining.
Preferably, described MCU comprises the first detection module being electrically connected with described attenuator circuit, describedOne detection module is for detection of the polarizing voltage after described attenuator circuit attenuation processing, and according to decay placePolarizing voltage after reason judges the polarizing voltage state of power supply circuits.
Preferably, described MCU also comprises the second detection module being electrically connected with described channel demodulator, instituteState the second detection module for detection of after described amplifying circuit amplifies processing and through described channel demodulator solutionThe voltage signal of the DiSEqC communication command of analysing, and according to the data message judgement power supply electricity obtaining after resolvingThe voltage status of road DiSEqC communication command.
Preferably, described MCU also comprises the sending module and the 3rd inspection that are electrically connected with described satellite low noise blockSurvey module, described sending module, for sending the LNB state head order of DiSEqC inquiry satellite antenna;Described the 3rd detection module, for receiving the resolving information of replying that satellite low noise block returns, and according to receptionThe resolving information of replying detect the line status of satellite antenna.
The present invention is entering after detecting pattern by testing circuit the polarizing voltage of obtaining and DiSEqCCommunications command detects, and polarizing voltage detected under normal circumstances and by channel demodulator and confessionThe DiSEqC communications command normal condition of electricity after the circuit power supply circuits that judge are normal, make television set passableAutomatically detect the state of in-line power circuit, thereby flow process and the operating time of having simplified manual detection enterAnd improve user's experience.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of television set feed detection method of the present invention one embodiment;
Fig. 2 is the refinement schematic flow sheet of step S120 in Fig. 1;
Fig. 3 is the schematic flow sheet of another embodiment of television set feed detection method of the present invention;
Fig. 4 is the high-level schematic functional block diagram of television set of the present invention;
Fig. 5 is the circuit diagram of testing circuit in Fig. 4;
Fig. 6 is the high-level schematic functional block diagram of MCU in Fig. 4.
Realization, functional characteristics and the advantage of the object of the invention, in connection with embodiment, are done further with reference to accompanying drawingExplanation.
Detailed description of the invention
Should be appreciated that specific embodiment described herein is only in order to explain the present invention, and be not used in limitDetermine the present invention.
The invention provides a kind of television set feed detection method, with reference to Fig. 1, in one embodiment, described electricityComprise the following steps depending on machine feed detection method:
Step S110, obtains polarizing voltage and DiSEqC communications command that satellite low noise block is carried; DescribedPolarizing voltage be to be controlled the voltage of power supply circuits output by MCU, can be specifically that MCU exports one defeatedGo out polarizing voltage order and then control power supply circuits to channel demodulator and export corresponding polarizing voltage, orMCU directly controls the control command of power supply circuits output polarization voltage, and described DiSEqC communications command isBy the order of MCU control channel demodulator output, specifically MCU exports DiSEqC communicationThen the instruction of order exports corresponding DiSEqC communications command by channel demodulator to channel demodulator.
In the present embodiment, describe as an example of satellite television example. Common satellite television comprises satellite high frequencyHead, channel demodulator, power supply circuits and master chip, the present invention arrange MCU (MicroControlUnit,Micro-control unit) be built in described master chip, thereby without setting up in addition. In addition, increased by an inspectionSlowdown monitoring circuit, its input is electrically connected with satellite low noise block, and output respectively with channel demodulator and MCUElectrical connection.
The major function of satellite low noise block is to receive 950～2150MHZ DTV high-frequency signal, and carries outChannel selection and high-frequency signal amplify and frequency-conversion processing. The function of channel demodulator is in satellite televisionFrequently signal carries out channel demodulation and decoding, and output transmission stream is to rear end distributor processes, receives MCU simultaneouslyControl instruction output polarization voltage and DiSEqC communications command. The function of power supply circuits is to provide the level utmost pointChange voltage 18.5V and vertical polarization voltage 13.5V, and export DiSEqC signal command. DiSEqC signalOrder is by digital satellite television receiver control, and the collection (control command) of giving an order is given relevant device, asChange-over switch, switch, antenna driving apparatus, the satellite low noise block of inquiry satellite antenna, communications commandDeng. In the present embodiment, DiSEqC is a control protocol.
Step S120, detects the polarizing voltage of obtaining and DiSEqC communications command, if detectPolarizing voltage and DiSEqC communications command all normal, judge that power supply circuits are normal.
The present invention is entering after detecting pattern by testing circuit the polarizing voltage of obtaining and DiSEqCCommunications command detects, and polarizing voltage detected under normal circumstances and DiSEqC communications command normalThe situation power supply circuits that judge are normal, make television set can automatically detect the state of in-line power circuit, fromAnd flow process and the operating time of having simplified manual detection, and then improve user's experience.
In one embodiment, as shown in Figure 2, on the basis of the embodiment of above-mentioned Fig. 1, the present embodimentIn, described step S120 comprises:
Step S121, detects the polarizing voltage of obtaining, if polarizing voltage is in preset range,Control output DiSEqC communications command, in the present embodiment, DiSEqC communications command is to control letter by MCURoad demodulator output;
Step S122, detects by the DiSEqC communications command of channel demodulator and power supply circuits output,If the DiSEqC communications command of exporting by channel demodulator and power supply circuits, in default scope, is sentencedDisconnected power supply circuits are normal.
In this enforcement by again DiSEqC communications command being detected in the time detecting that polarizing voltage is normal,Also can exchange with the order that detects DiSEqC communications command detecting polarizing voltage.
In one embodiment, as shown in Figure 3, on the basis of the embodiment of above-mentioned Fig. 2, the present embodimentIn, described step S121 comprises:
Step S1211, carries out attenuation processing by testing circuit to the polarizing voltage of obtaining and obtains attenuation processingAfter polarizing voltage;
Step S1212, detects the polarizing voltage after attenuation processing and judges whether in preset range.
In the present embodiment, attenuator circuit is made up of resistance R 7 and R8. This attenuator circuit is carried power supply circuitsThe horizontal polarization voltage 18.5V of confession or vertical polarization voltage 13.5V decay to 3V left and right, are then input to0 port of the ADC (Analog-to-digitalconverter, analog-digital converter) of MCU, passes throughDetecting the voltage of ADC0 and realize the detection to power supply circuits, is to detect power supply circuits to provide in the present embodimentGive LNB (being low noise block downconverter: the LowNoiseBlock) voltage of satellite antenna. Resistance R 7With the attenuating of the attenuator circuit of R8 composition be 7.3 times, i.e. horizontal polarization voltage 18.0～19.5V correspondenceADC0 input voltage be 2.47～2.67V, the ADC0 that vertical polarization voltage 13.0～14.5V is corresponding is defeatedEntering voltage is 1.78～1.99V. When detecting that ADC0 is in the scope of 2.47～2.67V and 1.78～1.99V,The work that shows supply voltage is normal.
In the present embodiment, concrete supply voltage testing process is as follows: first open power supply circuits, MCU controlPower supply circuits output horizontal polarization voltage 18.5V processed, then detects the corresponding magnitude of voltage that ADC0 changes,Judge whether in the scope of 2.47～2.67V, if the described horizontal polarization voltage after attenuation processing does not existIn preset range, show horizontal polarization electric voltage exception, then in on-screen menu, show " power supply circuitsHorizontal polarization electric voltage exception "; If the described horizontal polarization voltage after attenuation processing is in preset range,Show that horizontal polarization voltage is normal. Control again power supply circuits output vertical polarization voltage 13.5V, then detectThe corresponding magnitude of voltage of ADC0 conversion, judges that whether described vertical polarization voltage after attenuation processing existIn the scope of 1.78～1.99V, if the vertical polarization voltage after attenuation processing, not in preset range, is shownBright vertical polarization electric voltage exception then shows " power supply circuits vertical polarization electric voltage exception " in on-screen menu,If the described vertical polarization voltage after attenuation processing, in preset range, is just showing vertical polarization voltageOften. When the described horizontal polarization voltage after attenuation processing or vertical polarization voltage show that when normal, MCUCan send DiSEqC communication command by control channel demodulator.
In the present embodiment, when detecting that in factory mode and current information source be in satellite television information source time,Automatically enter power supply circuits testing process, MCU makes power supply electricity by I2C to channel demodulator output commandHorizontal polarization voltage is exported on road, then detects the input voltage of ADC0, judges whether in preset range.When in preset range, the operation of carrying out next step and sending DiSEqC communication command, if at this modelEnclose, show power supply circuits dysfunction, and in on-screen menu, show " power supply circuits polarization electricityPress abnormal ".
In one embodiment, described polarizing voltage comprises horizontal polarization voltage and vertical polarization voltage. OtherIn embodiment, described polarizing voltage can be also other types according to actual needs, and the present embodiment alsoDo not limit the detection order of described horizontal polarization voltage and vertical polarization voltage.
In one embodiment, as shown in Figure 3, on the basis of the embodiment of above-mentioned Fig. 2, the present embodimentIn, the polarizing voltage after described detection attenuation processing also judges whether also to wrap after the step of preset rangeDraw together:
Step S1213, if the polarizing voltage after attenuation processing not in preset range, judges described power supply electricityRoad is abnormal, and in on-screen menu, shows that power supply circuits polarizing voltage is abnormal.
And the step in step S120, the DiSEqC communications command obtaining being detected comprises:
Step S1221, if the described polarizing voltage after attenuation processing is in preset range, to described DiSEqCThe voltage signal of communication command amplifies processing;
Step S1222, resolves and obtains data message through amplifying voltage signal after treatment;
In the present embodiment, due to the voltage of the signal waveform of the DiSEqC communication command of satellite low noise block outputPeak value only has 0.65V, but channel demodulator incoming level need to meet the level standard that is greater than 2.5V, because ofThis need to make channel demodulator port voltage peak value be amplified to 3.3V just to detect. DiSEqC detectsCircuit be amplifying circuit by triode Q1 and Q2, resistance R 1～R6, capacitor C 1 and C2 composition. ShouldDiSEqC testing circuit has and only has the voltage peak of 0.65V to be amplified to the Voltage Peak of 3.3V DiSEqCValue. The signal of satellite low noise block output comprises polarizing voltage and DiSEqC communication command, because polarizing voltage isDirect current signal, and DiSEqC communication command is AC signal, therefore, direct current can be believed by capacitor C 2Number separate with these two signals of AC signal, and deliver to respectively the ADC0[analog-digital converter of MCU] endIn mouth and channel demodulator.
Whether step S1223, detect the data message obtaining in preset range.
In the present embodiment, data message comprises frequency and the command information of DiSEqC communication command, this communicationThe preset range of frequency of order is 21～23KHZ, and command information corresponding be DiSEqC communication commandHexadecimal code value. As comprised Framing, Address, Command and Data, itsMiddle Framing refers to command format, and Address refers to the address of devices that will take orders, CommandRefer to command context, Data refers to data content.
Step S1224, if the data message obtaining in preset range, judges that power supply circuits are normal;
Step S1225, if the data message obtaining, not in default scope, judges that power supply circuits are abnormalAnd show.
In the present embodiment, because channel demodulator itself just has the function that receives and resolve DiSEqC order.The sampling module of the ADC analog-digital converter by channel demodulator inside can detect the modulation of DiSEqCFrequency can be resolved DiSEqC order by the DiSEqC demodulation module of channel demodulator inside simultaneouslyCommand information. MCU is again by I2C (InterIntegratedCircuit, internal integrated circuit) access letterIn road demodulator, the register of DiSEqC can obtain the command information of DiSEqC. When MCU detectsThe frequency of input waveform is 22KHZ, when the DiSEqC command context of parsing is correct simultaneously, shows DiSEqCFunction be also normal.
In the present embodiment, detection level voltage, vertical voltage, then test DiSEqC frequency not successivelySequentially, the order of rationally adjustment according to actual needs. Automatically the testing conditions triggering is: entering workFactory's pattern, and current information source is will trigger under satellite television information source, and then detect polarizing voltageFrequency and command context with DiSEqC communication command.
In one embodiment, as shown in Figure 3, on the basis of the embodiment of above-mentioned Fig. 2, the present embodimentIn, whether the data message that described detection is obtained also comprises after the step of preset range:
Step S1226, the LNB status command of transmission DiSEqC inquiry satellite antenna;
Step S1227, what reception satellite low noise block returned replys resolving information, and according to the solution of replying receivingThe information of analysing judges that whether the line status of satellite antenna is normal;
Step S1228, replys resolving information if receive, and resolve to reply resolving information correct, sentenceThe line status of disconnected satellite antenna is normal, and in on-screen menu, shows that the circuit of satellite antenna is normal.
In the present embodiment, MCU sends the LNB status command of DiSEqC inquiry satellite antenna, and receivesThe LNB of satellite antenna send and via satellite tuner return reply resolving information, should according to what receiveAnswering resolving information judges that whether satellite antenna circuit is normal and shows corresponding information. First detect in television setWhether the minor loop of portion's circuit is normal, and then whether the large loop of detection satellite antenna is normal. InnerMinor loop refers to by the channel demodulator in the mainboard of TV, satellite low noise block, power supply circuits, detection electricityThe circuit of road and MCU composition. Satellite antenna large loop refer to and comprise: minor loop, external signalConnecting line and satellite antenna. When detecting that at user model be user's normal boot-strap, and current information source is to defendWhen star information source, then carry out power supply circuits testing process above, when detecting, power supply circuits are working properly,Then MCU via satellite tuner to the LNB of satellite antenna send DiSEqC communications protocol " inquiryThe LNB state of satellite antenna ", and the order of the DiSEqC sending: Framing, Address, CommandAnd Data, wherein Framing refers to command format, Address refers to the address of devices that will take orders,Command refers to command context, and Data refers to data content, as, its corresponding communications protocol be E2,11、10、1。
In the present embodiment, the LNB of satellite antenna receives the LNB state of satellite antenna " inquiry "After communication command, whether normally can reply current state. When state is normal, corresponding content of replying isE4,1; Work as abnormal state, do not reply. The LNB that can receive satellite antenna as MCU is (in figureDo not mark) the DiSEqC order of tuner loopback via satellite, and parse reply resolving informationFor E4,, show that satellite antenna is normal at 1 o'clock; When can not receive the order of satellite low noise block loopback,Show that satellite antenna exists abnormal, then show that at on-screen menu satellite antenna is abnormal, and then remind and useFamily checks outside line.
The present invention also provides a kind of television set, and with reference to Fig. 4, in one embodiment, described television set comprises letterRoad demodulator 1, power supply circuits 2, master chip 3 and be built in the micro-control unit in described master chip 3MCU4 (MicroControlUnit, micro-control unit), one end and the satellite of described channel demodulator 1 are highFrequently 5 electrical connection, the other end of channel demodulator 1 is connected with MCU4, and the two ends of power supply circuits 2 are dividedDo not connect antenna satellite low noise block 5 and channel demodulator 1, described television set also comprises testing circuit 6, instituteThe input of stating testing circuit 6 is electrically connected with satellite low noise block 5, and output respectively with channel demodulator 1And MCU4 electrical connection, described testing circuit 6 for polarizing voltage that satellite low noise block 5 is carried withAnd DiSEqC communications command detects, if the polarizing voltage and the DiSEqC communications command that detect are all normal,Judge that power supply circuits 2 are normal, described MCU4 be used for controlling power supply circuits 2 output polarization voltages andControl channel demodulator 1 is exported DiSEqC communications command.
In the present embodiment, describe as an example of satellite television example. Common satellite television comprises and contains satelliteTelevision tuner satellite low noise block 5, channel demodulator 1, power supply circuits 2 and master chip 3, the present inventionMCU (MicroControlUnit, micro-control unit) 4 is set and is built in described master chip 3, therebyWithout setting up in addition. In addition, increased input and be electrically connected with satellite low noise block 5, and output respectivelyThe testing circuit 6 being electrically connected with channel demodulator 1 and MCU4.
The major function of satellite low noise block 5 is to receive 950～2150MHZ DTV high-frequency signal, goes forward side by sideRow channel selection and high-frequency signal amplify and frequency-conversion processing. The function of channel demodulator 1 is to satellite televisionIntermediate-freuqncy signal carry out channel demodulation and decoding, and output transmit stream to rear end distributor processes. Power supply electricityThe function on road 2 is to provide horizontal polarization voltage 18.5V and vertical polarization voltage 13.5V, and exports DiSEqCSignal command. DiSEqC signal command is by digital satellite television receiver control, and the collection of giving an order (is controlledOrder) give relevant device, as the LNB of change-over switch, switch, antenna driving apparatus, satellite antennaDeng. In the present embodiment, DiSEqC is a control protocol.
The present invention is entering after detecting pattern by testing circuit 6 polarizing voltage of obtaining and DiSEqCCommunications command detects, and polarizing voltage detected under normal circumstances and DiSEqC communications command normalThe situation power supply circuits 2 that judge are normal, make television set can automatically detect the state of in-line power circuit 2,Thereby simplify flow process and the operating time of manual detection, and then improved user's experience.
In a preferred embodiment, as shown in Figure 5, on the basis of the embodiment of above-mentioned Fig. 4, this realityExecute in example, described testing circuit 6 comprises attenuator circuit 101 and amplifying circuit 102, described attenuator circuit101 input is electrically connected with described satellite low noise block 5, the output of described attenuator circuit 101 with described inMCU4 electrical connection, described attenuator circuit 101, for obtaining polarizing voltage and the polarizing voltage of obtaining being enteredRow attenuation processing obtains the polarizing voltage after attenuation processing; The input of described amplifying circuit 102 with described inAntenna satellite low noise block 5 is electrically connected, the output of described amplifying circuit 102 and described channel demodulator 1Electrical connection, described amplifying circuit 102 is for obtaining DiSEqC communication command logical to the DiSEqC obtainingThe voltage signal of news order amplifies processing.
In a preferred embodiment, described polarizing voltage comprises horizontal polarization voltage and vertical polarization voltage.In other embodiment, described polarizing voltage can be also other types according to actual needs, and this enforcementExample does not limit the detection order of described horizontal polarization voltage and vertical polarization voltage.
In the present embodiment, attenuator circuit 101 is made up of resistance R 7 and R8. This attenuator circuit 101 will supplyThe horizontal polarization voltage 18.5V that electricity circuit 2 provides or vertical polarization voltage 13.5V decay to 3V left and right,Then be input to the ADC's (Analog-to-digitalconverter, analog-digital converter) of MCU40 port, realizes the detection to power supply circuits by the voltage that detects ADC0. Resistance R 7 and R8 compositionThe attenuating of attenuator circuit 101 be 7.3 times, horizontal polarization voltage 18.0～19.5V is correspondingADC0 voltage is 2.47～2.67V, and the ADC0 voltage that vertical polarization voltage 13.0～14.5V is corresponding is1.78～1.99V. When detecting that ADC0 is in the scope of 2.47～2.67V and 1.78～1.99V, show to supplyThe work of electricity circuit is normal.
In the present embodiment, the signal wave of the DiSEqC communication command of exporting due to tuner satellite low noise block 5The voltage peak of shape only has 0.65V, but channel demodulator 1 incoming level need to meet the electricity that is greater than 2.5VFlat standard, therefore needs to make channel demodulator 1 port voltage peak value to be amplified to 3.3V and just can detect.DiSEqC testing circuit 6 be amplifying circuit 102 by triode Q1 and Q2, resistance R 1～R6, electric capacityC1 and C2 composition. This DiSEqC testing circuit 6 has the Voltage Peak that DiSEqC is only had to 0.65VValue is amplified to the voltage peak of 3.3V. The signal that satellite low noise block 5 is exported comprises polarizing voltage and DiSEqCCommunication command, because polarizing voltage is direct current signal, and DiSEqC communication command is AC signal, therefore,These two signals of direct current signal and AC signal can be separated by capacitor C 2, and deliver to MCU4 respectivelyADC0 port and channel demodulator 1 in.
In a preferred embodiment, with reference to Fig. 6, described MCU4 comprises and described attenuator circuit 101 electricityThe first detection module 401 connecting, described first detection module 401 is for detection of through described attenuator circuitPolarizing voltage after 101 attenuation processing, and judge power supply circuits 2 according to the polarizing voltage after attenuation processingPolarizing voltage state.
In the present embodiment, concrete power supply circuits 2 testing processes are as follows: first open power supply circuits 2, MCU4Control power supply circuits 2 and export horizontal polarization voltage 18.5V, then detect the corresponding voltage of ADC0 conversionValue, judges whether in the scope of 2.47～2.67V, if the described horizontal polarization voltage after attenuation processingNot in preset range, show horizontal polarization electric voltage exception, then in on-screen menu, show " power supplyCircuit level polarizing voltage is abnormal "; If the described horizontal polarization voltage after attenuation processing is in preset rangeIn, show that horizontal polarization voltage is normal. Power supply circuits 2 are set again and export vertical polarization voltage 13.5V,Then the corresponding magnitude of voltage that detects ADC0 conversion, judges the described vertical polarization voltage after attenuation processingWhether in the scope of 1.78～1.99V, if the vertical polarization voltage after attenuation processing is not in preset rangeIn, show vertical polarization electric voltage exception, then in on-screen menu, show " power supply circuits vertical polarization electricityPress abnormal ", if the described vertical polarization voltage after attenuation processing is in preset range, show the vertical utmost pointChange voltage normal. When the described horizontal polarization voltage after attenuation processing or vertical polarization voltage show when normal,MCU4 can send DiSEqC communication command.
In the present embodiment, when detecting that in factory mode and current information source be in satellite television information source time,Automatically enter feed circuit testing process, MCU4 makes to supply to channel demodulator 1 output command by I2CElectricity circuit 2 is exported horizontal polarization voltage, then detects the input voltage of ADC0, judges whether defaultScope. When in preset range, the operation of carrying out next step and sending DiSEqC communication command, if notIn this scope, show power supply circuits dysfunction, and show " power supply circuits in on-screen menuPolarizing voltage is abnormal ".
In a preferred embodiment, with reference to Fig. 6, described MCU4 also comprises and described channel demodulator 1The second detection module 402 of electrical connection, described the second detection module 402 is for detection of through described amplifying circuitVoltage signal rear and DiSEqC communication command that resolve through described channel demodulator 1 is processed in 102 amplifications,And judge the voltage shape of the DiSEqC communication command of power supply circuits 2 according to the data message that obtains after resolvingState.
In the present embodiment, because itself just having, channel demodulator 1 receives and resolves DiSEqC communication commandFunction. Can detect the modulating frequency of DiSEqC by the ADC sampling module of channel demodulator 1 inside,Can resolve the order of DiSEqC order by the DiSEqC demodulation module of channel demodulator 1 inside simultaneouslyInformation. MCU4 is again by I2C (InterIntegratedCircuit, internal integrated circuit) access demodulationIn device, the register of DiSEqC can obtain the data message of DiSEqC. When second of MCU4 detectsModule 402 detects that input waveform is in preset range 21～23KHZ, and the DiSEqC order of resolvingWhen content is correct, the voltage that shows DiSEqC communications command is also normal.
In the present embodiment, data message comprises frequency and the command context of DiSEqC communication command, this communicationThe preset range of frequency of order is 21～23KHZ, and command context corresponding be DiSEqC communication commandHexadecimal code value. As comprised Framing, Address, Command and Data, itsMiddle Framing refers to command format, and Address refers to the address of devices that will take orders, CommandRefer to command context, Data refers to data content.
In the present embodiment, MCU4 is for ability control channel demodulator 1 in the time detecting that polarizing voltage is normalOutput DiSEqC communications command, but detection level polarizing voltage, vertical polarization voltage, then testDiSEqC communications command does not have sequencing, the order of rationally adjustment according to actual needs. From movable contactThe testing conditions of sending out is: entering factory mode, and current information source is will under satellite television information sourceTrigger, and then detect frequency and the command context of polarizing voltage and DiSEqC communication command.
In a preferred embodiment, with reference to Fig. 6, described MCU4 also comprises and described satellite low noise block 5Sending module 403 and the 3rd detection module 404 of electrical connection, described sending module 403, for sendingThe LNB order of DiSEqC inquiry satellite antenna; Described the 3rd detection module 404 is high for receiving satelliteFrequently 5 return reply resolving information, and according to the line of replying resolving information and detect satellite antenna receivingLine state.
In the present embodiment, the LNB of MCU4 reception satellite antenna sends also tuner 5 via satellite and returnsReply resolving information, and receive reply resolving information, judge that whether satellite antenna circuit normal and showShow corresponding information. Whether the minor loop that first detects inside television circuit is normal, and then detects satelliteWhether the large loop of antenna is normal. Inner minor loop refer to by the channel demodulator 1 in the mainboard of TV,The circuit of satellite low noise block 5, power supply circuits 2, testing circuit 6 and MCU4 composition. Satellite antennaLarge loop refer to and comprise: minor loop, external signal connecting line and satellite antenna. When detecting userPattern is user's normal boot-strap, and current information source is while being satellite information source, then carries out power supply circuits aboveTesting process, when detecting, power supply circuits are working properly, and then MCU4 sends to the LNB of satellite antennaDiSEqC communications protocol " the LNB state of inquiry satellite antenna ", and the order of the DiSEqC sending:Framing, Address, Command and Data, wherein Framing refers to command format, AddressRefer to the address of devices that will take orders, Command refers to command context, and Data refers to data content,As, its corresponding communications protocol is E2,11,10,1.
In the present embodiment, the LNB of satellite antenna receives the LNB state of satellite antenna " inquiry "After communication command, whether normally can reply current state. When state is normal, corresponding content of replying isE4,1; Work as abnormal state, do not reply. The LNB that can receive satellite antenna as MCU4 sendsAnd the DiSEqC order of tuner 5 loopbacks via satellite, and the resolving information of replying parsing is E4,, show that satellite antenna is normal at 1 o'clock; When can not receive the order of satellite low noise block 5 loopbacks, showSatellite antenna exists abnormal, then shows that at on-screen menu satellite antenna is abnormal, and then reminding user inspectionOutside line.
These are only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, everyUtilize equivalent structure or the conversion of equivalent flow process that description of the present invention and accompanying drawing content do, or directly orConnect and be used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a television set feed detection method, described television set comprises satellite low noise block, letterRoad demodulator, MCU and power supply circuits, is characterized in that, described television set feed detectsMethod comprises the following steps:
Obtain polarizing voltage and DiSEqC communications command that satellite low noise block is carried, the described utmost pointChanging voltage is the voltage of being controlled power supply circuits output by MCU, described DiSEqC communications commandIt is the order by the output of MCU control channel demodulator;
The polarizing voltage of obtaining and DiSEqC communications command are detected, if the utmost point detectingChange voltage and DiSEqC communications command all normal, judge that power supply circuits are normal.
2. television set feed detection method as claimed in claim 1, is characterized in that institutePolarizing voltage and the DiSEqC communications command stated obtaining detect, if the polarization detectingVoltage and DiSEqC communications command are all normal, judge that the normal step of power supply circuits comprises:
The polarizing voltage of obtaining is detected, if polarizing voltage, in preset range, is controlledChannel demodulator output DiSEqC communications command;
Detect by the DiSEqC communications command of power supply circuits and satellite low noise block output, if logicalCross the DiSEqC communications command of power supply circuits and satellite low noise block output in default scope,Judge that power supply circuits are normal.
3. television set feed detection method as claimed in claim 1, is characterized in that instituteStating the step that the polarizing voltage to obtaining detects comprises:
By testing circuit, the polarizing voltage of obtaining being carried out to attenuation processing obtains after attenuation processingPolarizing voltage;
Detect the polarizing voltage after attenuation processing and judge whether in preset range.
4. television set feed detection method as claimed in claim 1, is characterized in that instituteStating the step that the DiSEqC communications command to obtaining detects comprises:
The voltage signal of described DiSEqC communication command is amplified to processing;
Resolve and obtain data message through amplifying voltage signal after treatment;
Whether the data message that detection is obtained is in preset range.
5. television set feed detection method as claimed in claim 2, is characterized in that instituteState and detect the data message that obtains and whether after the step of preset range, also comprise:
Send the LNB status command of DiSEqC inquiry satellite antenna;
What reception satellite low noise block returned replys resolving information, and resolves letter according to replying of receivingBreath judges that whether the line status of satellite antenna is normal;
Reply resolving information if receive, and it is correct to reply resolving information, judges satellite antennaLine status normal, and in on-screen menu, show that the circuit of satellite antenna is normal.
6. a television set, comprises channel demodulator, power supply circuits and MCU, described letterOne end of road demodulator is electrically connected with satellite low noise block, the other end of channel demodulator and MCUConnect, the two ends of power supply circuits connect respectively satellite low noise block and channel demodulator, and its feature existsIn, described television set also comprises testing circuit, the input of described testing circuit and satellite high frequencyHead electrical connection, and output is electrically connected with channel demodulator and MCU respectively, described detectionCircuit is examined for polarizing voltage and DiSEqC communications command that satellite low noise block is carriedSurvey, if the polarizing voltage and the DiSEqC communications command that detect are all normal, judge power supply circuitsNormally, described MCU is used for controlling power supply circuits output polarization voltage and control channel demodulationDevice output DiSEqC communications command.
7. television set as claimed in claim 6, is characterized in that, described testing circuit bagDraw together attenuator circuit and amplifying circuit, the input of described attenuator circuit and described satellite low noise block electricityConnect, the output of described attenuator circuit is electrically connected with described MCU, described attenuator circuit,Obtain attenuation processing for obtaining polarizing voltage and the polarizing voltage of obtaining being carried out to attenuation processingAfter polarizing voltage; The input of described amplifying circuit is electrically connected with described satellite low noise block, instituteThe output of stating amplifying circuit is electrically connected with described channel demodulator, and described amplifying circuit is used for obtainingGet DiSEqC communication command and the voltage signal of the DiSEqC communication command obtaining is putLarge processing.
8. television set as claimed in claim 7, is characterized in that, described MCU comprisesWith the first detection module that described attenuator circuit is electrically connected, described first detection module for detection ofPolarizing voltage after described attenuator circuit attenuation processing, and according to the polarization electricity after attenuation processingPress the polarizing voltage state that judges power supply circuits.
9. television set as claimed in claim 7, is characterized in that, described MCU also wrapsDraw together the second detection module being electrically connected with described channel demodulator, described the second detection module is used forDetect the DiSEqC resolving after described amplifying circuit amplifies processing and through described channel demodulatorThe voltage signal of communication command, and judge power supply circuits according to the data message that obtains after resolvingThe voltage status of DiSEqC communication command.
10. television set as claimed in claim 6, is characterized in that, described MCU also wrapsDraw together the sending module and the 3rd detection module that are electrically connected with described satellite low noise block, described transmission mouldPiece, for sending the LNB status command of DiSEqC inquiry satellite antenna; Described the 3rd inspectionSurvey module, for receiving the resolving information of replying that satellite low noise block returns, and should according to what receiveAnswer the line status that resolving information detects satellite antenna.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410723301.7A CN105657411A (en) | 2014-12-02 | 2014-12-02 | TV and TV feed detection method |
| PCT/CN2014/094145 WO2016086462A1 (en) | 2014-12-02 | 2014-12-17 | Television and television feed detection method |
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|---|---|---|---|
| CN201410723301.7A CN105657411A (en) | 2014-12-02 | 2014-12-02 | TV and TV feed detection method |
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| CN105657411A true CN105657411A (en) | 2016-06-08 |
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| CN201410723301.7A Pending CN105657411A (en) | 2014-12-02 | 2014-12-02 | TV and TV feed detection method |
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| WO (1) | WO2016086462A1 (en) |
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| WO2020057493A1 (en) * | 2018-09-19 | 2020-03-26 | 青岛海信电器股份有限公司 | Overcurrent protection method and television receiver |
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| CN109587473A (en) * | 2018-12-04 | 2019-04-05 | 安徽站乾科技有限公司 | A kind of self detection device of the failure of satellite TV system |
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| WO2016086462A1 (en) | 2016-06-09 |
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Application publication date: 20160608 |