CN103716509A - Correcting circuit, television and correcting method of transition minimized differential signaling - Google Patents
Correcting circuit, television and correcting method of transition minimized differential signaling Download PDFInfo
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Abstract
The invention provides a correcting circuit, television and correcting method of a transition minimized differential signaling. The input end of the correcting circuit is connected with a high-definition multimedia interface, and the output end of the correcting circuit is connected with an input pin of a signal source front end chip. The correcting circuit comprises a blocking component and a clamping component. The blocking component filters direct-current coupling voltage in the transition minimized differential signaling transmitted by the high-definition multimedia interface, then an alternate-current signal in the transition minimized differential signaling is transmitted to the input pin of the signal source front end chip, and the clamping component is used for providing a direct-current signal which is clamped within direct-current coupling voltage range of a standard transition minimized differential signaling and inputs the direct-current signal within the direct-current coupling voltage range of the standard transition minimized differential signaling into the input pin of the signal source front end chip. A non-standard transition minimized differential signaling can be corrected.
Description
Technical field
The present invention relates to TV domain, relate in particular to a kind of correcting circuit, television set and method thereof of transition minimized differential signaling.
Background technology
Along with the development of television display technology, HDTV has more and more entered people's life.HDTV adopts HDMI (High Definition Multimedia Interface) (HDMI, High Definition Multimedia Interface) to receive high resolution audio and video data.High-resolution multimedia signal source is used transition minimized differential signaling (TMDS, Transition Minimized Differential Signaling) technology to transmit high resolution audio and video data-signal conventionally.HDMI (High Definition Multimedia Interface) is carried out signal transmission by transition minimized differential signaling technology, and transition minimized differential signaling transmission system is divided into source (source) and receiving terminal (sink).As shown in Figure 1, each HDMI (High Definition Multimedia Interface) need to be transmitted 3 circuit-switched data transition minimized differential signalings and 1 road clock transition minimized differential signaling, because transition minimized differential signaling is differential signal, every transmission of one line transition minimized differential signaling need to be used 2 physical signal lines, so each HDMI (High Definition Multimedia Interface) has been used (3+1) * 2=8 root physical signal lines altogether.The HDMI (High Definition Multimedia Interface) of HDTV receives the transition minimized differential signaling that high-resolution multimedia signal source sends, and sends it to the signal source front-end chip of HDTV.Signal source front-end chip parses correct audio, video data from the transition minimized differential signaling receiving, and the main control chip that is converted to row field sync signal and sends it to HDTV is to complete the output of audio, video data.
The direct-current coupling voltage of standard transition minimized differential signaling is generally 3.0～3.3V, and the direct-current coupling voltage range of the transition minimized differential signaling that the input pin of the signal source front-end chip of HDTV can detect is 2.7～3.3V.But because HDMI (High Definition Multimedia Interface) is supported hot plug operations, so the HDMI (High Definition Multimedia Interface) of HDTV can cause its interface circuit to damage due to long-term plug use.The interface circuit damage of HDMI (High Definition Multimedia Interface) can cause the direct-current coupling voltage of transition minimized differential signaling of its output likely lower than 2.7V.While there are this abnormal conditions, signal source front-end chip just cannot parse audio, video data from transition minimized differential signaling, causes the television set cannot normal play.
Summary of the invention
In view of this, the invention provides a kind of correcting circuit, television set and method thereof of transition minimized differential signaling, it can be proofreaied and correct non-standard transition minimized differential signaling, thereby when there are abnormal conditions, also can make TV normal play.
The invention provides a kind of correcting circuit of transition minimized differential signaling, the input of described correcting circuit connects HDMI (High Definition Multimedia Interface), the input pin of the output connecting signal source front-end chip of described correcting circuit, described correcting circuit comprises block isolating device part and clamps.
Described block isolating device part is for the direct-current coupling voltage of the transition minimized differential signaling that filters out described HDMI (High Definition Multimedia Interface) and send and the AC signal in described transition minimized differential signaling is inputed to the input pin of described signal source front-end chip.
Described clamps is for providing clamper to the direct current signal in the scope of the direct-current coupling voltage of standard transition minimized differential signaling, and the direct current signal in the scope of the direct-current coupling voltage of standard transition minimized differential signaling inputed to the input pin of described signal source front-end chip.
Further, clamps of the present invention is pull-up resistor, described pull-up resistor one end connects the power supply mating with it, and the other end connects the input pin of described signal source front-end chip, and the output voltage of described power supply is in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.
Further, the output voltage of power supply of the present invention is the maximum direct-current coupling voltage of standard transition minimized differential signaling.
Further, block isolating device part of the present invention is capacitance.
Further, correcting circuit of the present invention also comprises electrostatic protection chip, and one end of described electrostatic protection chip connects described HDMI (High Definition Multimedia Interface), and the other end connects described block isolating device part.
Further, correcting circuit of the present invention also comprises impedance matching resistance, and one end of described impedance matching resistance connects described block isolating device part, and the other end connects the input pin of described signal source front-end chip.
The present invention also provides a kind of television set with the correcting circuit of transition minimized differential signaling, comprise HDMI (High Definition Multimedia Interface), signal source front-end chip, and main control chip, also comprise correcting circuit, the transition minimized differential signaling that described correcting circuit sends described HDMI (High Definition Multimedia Interface) is proofreaied and correct, and the transition minimized differential signaling after proofreading and correct is sent to the input pin of described signal source front-end chip, described signal source front-end chip parses correct audio, video data from the transition minimized differential signaling receiving, and send it to main control chip to complete the output of audio, video data, described correcting circuit is as noted above.
The present invention also provides a kind of bearing calibration of transition minimized differential signaling, it is characterized in that, described bearing calibration comprises:
Filter out the direct-current coupling voltage in the transition minimized differential signaling that HDMI (High Definition Multimedia Interface) sends;
AC signal in described transition minimized differential signaling is sent to the input pin of signal source front-end chip, and provide direct current signal in the scope of direct-current coupling voltage of a standard transition minimized differential signaling to input to the input pin of described signal source front-end chip.
Further, before the direct-current coupling voltage filtering out in the transition minimized differential signaling that HDMI (High Definition Multimedia Interface) sends of the present invention, also comprise step:
Filter out the static comprising in the transition minimized differential signaling of described HDMI (High Definition Multimedia Interface) transmission.
Further, of the present inventionly send to the input pin of signal source front-end chip to be the AC signal in described transition minimized differential signaling: the AC signal in described transition minimized differential signaling to be sent to after impedance matching resistance to the input pin of signal source front-end chip.
From above technical scheme, the present invention adopts block isolating device part to filter out the direct-current coupling voltage in the transition minimized differential signaling that HDMI (High Definition Multimedia Interface) sends, like this, send in the transition minimized differential signaling of input pin of signal source front-end chip and only retain AC signal; Meanwhile, the present invention adopts the voltage clamping of the direct current signal that clamps receives the input pin of signal source front-end chip in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.Like this, the direct current signal that the direct-current coupling voltage receiving due to the input pin of signal source front-end chip of the present invention is its reception and the coupled voltages of AC signal, therefore, the direct-current coupling voltage that the input pin of signal source front-end chip of the present invention receives is in the scope of the direct-current coupling voltage of standard transition minimized differential signaling, can be because signal source front-end chip cannot parse audio, video data from non-standard transition minimized differential signaling, cause the television set cannot normal play.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of existing HDMI signal;
Fig. 2 is the circuit diagram of the television set of the present invention's correcting circuit with transition minimized differential signaling;
Fig. 3 is the flow chart that the present invention has the bearing calibration of transition minimized differential signaling.
Embodiment
The present invention adopts block isolating device part to filter out the direct-current coupling voltage in the transition minimized differential signaling that HDMI (High Definition Multimedia Interface) sends, and like this, sends in the transition minimized differential signaling of input pin of signal source front-end chip and only retains AC signal.Meanwhile, the present invention adopts direct voltage clamper that clamps receives the input pin of signal source front-end chip in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.Therefore the direct-current coupling voltage that, the input pin of signal source front-end chip of the present invention receives is in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.
By following examples, further illustrate realization of the present invention.
Embodiment mono-
Referring to Fig. 1, the invention provides a kind of correcting circuit 1 of transition minimized differential signaling, the input of correcting circuit 1 connects HDMI (High Definition Multimedia Interface) 2, the input pin of the output connecting signal source front-end chip 3 of correcting circuit 1.
Particularly, the correcting circuit 1 of transition minimized differential signaling of the present invention is applied in existing HDTV, and existing HDTV comprises: HDMI (High Definition Multimedia Interface) 2, signal source front-end chip 3 and main control chip 4.The transition minimized differential signaling that HDMI (High Definition Multimedia Interface) 2 sends for receiving high-resolution multimedia signal source.Signal source front-end chip 3 is for carrying out the conversion of row field synchronization to the signal receiving, and for example ADI company designs and the ADV7850 of production.Main control chip 4 is for controlling the output of audio, video data.8 physical signal lines of coming from HDMI (High Definition Multimedia Interface) 2, before being connected to signal source front-end chip 3, have all been added identical correcting circuit 1, and Fig. 1 is that wherein 1 physical signal lines is added the schematic diagram after correcting circuit 1.
Block isolating device part 11 filters out after the direct-current coupling voltage in the transition minimized differential signaling that HDMI (High Definition Multimedia Interface) 2 sends, and the AC signal in transition minimized differential signaling is sent to the input pin of signal source front-end chip 3, clamps 12 is for providing clamper to the direct current signal in the scope of the direct-current coupling voltage of standard transition minimized differential signaling, and the direct current signal in the scope of the direct-current coupling voltage of standard transition minimized differential signaling inputed to the input pin of described signal source front-end chip 3.
Because the interface circuit of HDMI (High Definition Multimedia Interface) 2 is likely because long-term plug is used and is damaged, to send to the transition minimized differential signaling of correcting circuit 1 be likely non-standard transition minimized differential signaling to HDMI (High Definition Multimedia Interface) 2 like this.No matter HDMI (High Definition Multimedia Interface) 2 sends to the transition minimized differential signaling of correcting circuit 1 is standard signal or non-standard signal, the block isolating device part 11 of correcting circuit 1 all can, by the direct-current coupling voltage filtering in transition minimized differential signaling, send to the AC signal in transition minimized differential signaling the input pin of signal source front-end chip 3.The voltage clamping of the direct current signal that meanwhile, clamps 12 receives the input pin of signal source front-end chip 3 is in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.Therefore the direct current signal that, the input pin of signal source front-end chip 3 receives is the direct current signal in the scope of direct-current coupling voltage of standard transition minimized differential signaling.The direct current signal that the direct-current coupling voltage receiving due to the input pin of signal source front-end chip 3 is its reception and the coupled voltages of AC signal, like this, the direct-current coupling voltage that the input pin of signal source front-end chip 3 of the present invention receives is the coupled voltages of the direct current signal in the scope of direct-current coupling voltage of AC signal in the transition minimized differential signaling that sends of HDMI (High Definition Multimedia Interface) 2 and standard transition minimized differential signaling.
Therefore, even if HDMI (High Definition Multimedia Interface) 2 sends to the transition minimized differential signaling criteria of right and wrong signal of correcting circuit 1, the direct-current coupling voltage that the input pin of signal source front-end chip 3 of the present invention receives is also in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.Therefore, the non-standard transition minimized differential signaling that the input pin of 1 pair of signal source front-end chip 3 of correcting circuit of the present invention receives is proofreaied and correct, the television set with correcting circuit 1 of the present invention can be because signal source front-end chip 3 cannot parse audio, video data from non-standard transition minimized differential signaling, and causing cannot normal play audio, video data.
Further, clamps 12 of the present invention is pull-up resistor R1, pull-up resistor R1 one end connects power supply corresponding with it or coupling, the input pin of other end connecting signal source front-end chip 3, and the output voltage of power supply is in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.The direct-current coupling voltage of generally held standard transition minimized differential signaling is 2.7～3.3V.
Adopt pull-up resistor R1 as clamps, make circuit design simple, with low cost.
The value of pull-up resistor R1 is chosen according to system requirements by those of ordinary skills, and preferably, the resistance value that the present invention chooses pull-up resistor R1 is 100 ohm.
Further, the output voltage of power supply of the present invention is the maximum direct-current coupling voltage 3.3V of standard transition minimized differential signaling.
Like this, even if power supply through pull-up resistor generation loss, still can guarantee that the direct voltage clamper that the input pin of signal source front-end chip 3 is received is in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.
Further, block isolating device part 11 of the present invention is capacitance C.
Adopt capacitance C as block isolating device part, make circuit design simple, with low cost.
The value of capacitance C is chosen according to system requirements by those of ordinary skills, and preferably, the capacitance that the present invention chooses capacitance C is 0.1 μ.
Further, correcting circuit 1 of the present invention also comprises electrostatic protection chip, and one end of electrostatic protection chip connects HDMI (High Definition Multimedia Interface) 2, and the other end connects block isolating device part.
Electrostatic protection chip of the present invention avoid input transition minimized differential signaling in static signal source front-end chip 3 is damaged.
Further, correcting circuit 1 of the present invention also comprises impedance matching resistance R 2, and one end of impedance matching resistance R 2 connects block isolating device part 11, the input pin of other end connecting signal source front-end chip 3.
The value of impedance matching resistance R 2 is chosen according to system requirements by those of ordinary skills, and preferably, the resistance value that the present invention chooses impedance matching resistance R 2 is 100 ohm.
Owing to requiring differential lines impedance to equal 100 ohm in HDMI standard, the present invention adopts impedance matching resistance R 2 to meet the requirement of differential lines impedance when increasing therein protective circuit 1 in a physical signal lines.
Embodiment bis-
Referring to Fig. 1, the present invention also provides a kind of television set with the correcting circuit of transition minimized differential signaling, comprises HDMI (High Definition Multimedia Interface) 2, signal source front-end chip 3, and main control chip 4, also comprises correcting circuit 1.Input connects the transition minimized differential signaling that HDMI (High Definition Multimedia Interface) 2 sends for receiving high-resolution multimedia signal source.Signal source front-end chip 3 is for carrying out row field synchronization to the signal receiving, and for example ADI company designs and the ADV7850 of production.Main control chip 4 is for controlling the output of audio, video data.8 physical signal lines of coming from HDMI (High Definition Multimedia Interface) 2, before being connected to signal source front-end chip 3, have all been added identical correcting circuit 1, and Fig. 1 is that wherein 1 physical signal lines is added the schematic diagram after correcting circuit 1.
The transition minimized differential signaling that 1 pair of HDMI (High Definition Multimedia Interface) of correcting circuit 2 sends is proofreaied and correct, and the transition minimized differential signaling after proofreading and correct is sent to the input pin of signal source front-end chip 3, signal source front-end chip 3 parses correct audio, video data from the transition minimized differential signaling receiving, and sends it to main control chip 4 to complete the output of audio, video data.
Block isolating device part 11 filters out after the direct-current coupling voltage in the transition minimized differential signaling that HDMI (High Definition Multimedia Interface) 2 sends, AC signal in transition minimized differential signaling is sent to the input pin of signal source front-end chip 3, described clamps 12 is for providing clamper to the direct current signal in the scope of the direct-current coupling voltage of standard transition minimized differential signaling, and the direct current signal in the scope of the direct-current coupling voltage of standard transition minimized differential signaling inputed to the input pin of described signal source front-end chip 3.
Because the interface circuit of HDMI (High Definition Multimedia Interface) 2 is likely because long-term plug is used and is damaged, to send to the transition minimized differential signaling of correcting circuit 1 be likely non-standard transition minimized differential signaling to HDMI (High Definition Multimedia Interface) 2 like this.No matter HDMI (High Definition Multimedia Interface) 2 sends to the transition minimized differential signaling of correcting circuit 1 is standard signal or non-standard signal, the block isolating device part 11 of correcting circuit 1 all can, by the direct-current coupling voltage filtering in transition minimized differential signaling, send to the AC signal in transition minimized differential signaling the input pin of signal source front-end chip 3.The voltage clamping of the direct current signal that meanwhile, clamps 12 receives the input pin of signal source front-end chip 3 is in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.Therefore the direct current signal that, the input pin of signal source front-end chip 3 receives is the direct current signal in the scope of direct-current coupling voltage of standard transition minimized differential signaling.The direct current signal that the direct-current coupling voltage receiving due to the input pin of signal source front-end chip 3 is its reception and the coupled voltages of AC signal, like this, the direct-current coupling voltage that the input pin of signal source front-end chip 3 of the present invention receives is the coupled voltages of the direct current signal in the scope of direct-current coupling voltage of AC signal in the transition minimized differential signaling that sends of HDMI (High Definition Multimedia Interface) 2 and standard transition minimized differential signaling.
Therefore, even if HDMI (High Definition Multimedia Interface) 2 sends to the transition minimized differential signaling criteria of right and wrong signal of correcting circuit 1, the direct-current coupling voltage that the input pin of signal source front-end chip 3 of the present invention receives is also in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.Therefore, the non-standard transition minimized differential signaling that the input pin of 1 pair of signal source front-end chip 3 of correcting circuit of the present invention receives is proofreaied and correct, the television set with correcting circuit 1 of the present invention can be because signal source front-end chip 3 cannot parse audio, video data from non-standard transition minimized differential signaling, and causing cannot normal play audio, video data.
Further, clamps 12 of the present invention is pull-up resistor R1, pull-up resistor R1 one end connects the power supply mating with it, the input pin of other end connecting signal source front-end chip 3, and the output voltage of power supply is in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.The direct-current coupling voltage of generally held standard transition minimized differential signaling is 2.7～3.3V.
Adopt pull-up resistor R1 as clamps, make circuit design simple, with low cost.
The value of pull-up resistor R1 is chosen according to system requirements by those of ordinary skills, and preferably, the resistance value that the present invention chooses pull-up resistor R1 is 100 ohm.
Further, the output voltage of power supply of the present invention is the maximum direct-current coupling voltage 3.3V of standard transition minimized differential signaling.
Like this, even if power supply through pull-up resistor generation loss, still can guarantee that the direct voltage clamper that the input pin of signal source front-end chip 3 is received is in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.
Further, block isolating device part 11 of the present invention is capacitance C.
Adopt capacitance C as block isolating device part, make circuit design simple, with low cost.
The value of capacitance C is chosen according to system requirements by those of ordinary skills, and preferably, the capacitance that the present invention chooses capacitance C is 0.1 μ.
Further, correcting circuit 1 of the present invention also comprises electrostatic protection chip, and one end of electrostatic protection chip connects HDMI (High Definition Multimedia Interface) 2, and the other end connects block isolating device part.
Electrostatic protection chip of the present invention avoid input transition minimized differential signaling in static signal source front-end chip 3 is damaged.
Further, correcting circuit 1 of the present invention also comprises impedance matching resistance R 2, and one end of impedance matching resistance R 2 connects block isolating device part 11, the input pin of other end connecting signal source front-end chip 3.
The value of impedance matching resistance R 2 is chosen according to system requirements by those of ordinary skills, and preferably, the resistance value that the present invention chooses impedance matching resistance R 2 is 100 ohm.
Owing to requiring differential lines impedance to equal 100 ohm in HDMI standard, the present invention adopts impedance matching resistance R 2 to meet the requirement of differential lines impedance when increasing therein protective circuit 1 in a physical signal lines.
Embodiment tri-
Referring to Fig. 2, corresponding to above-mentioned means for correcting, the present invention also provides a kind of bearing calibration of transition minimized differential signaling, and this bearing calibration comprises:
S1, filter out the direct-current coupling voltage in the transition minimized differential signaling that HDMI (High Definition Multimedia Interface) sends.
Because the interface circuit of HDMI (High Definition Multimedia Interface) likely uses and is damaged due to long-term plug, the transition minimized differential signaling of HDMI (High Definition Multimedia Interface) transmission is likely non-standard transition minimized differential signaling like this.The transition minimized differential signaling no matter HDMI (High Definition Multimedia Interface) sends is standard signal or non-standard signal, and the present invention is the direct-current coupling voltage in filtering transition minimized differential signaling.
S2, the AC signal in described transition minimized differential signaling is sent to the input pin of signal source front-end chip, and provide direct current signal in the scope of direct-current coupling voltage of a standard transition minimized differential signaling to input to the input pin of described signal source front-end chip.
The present invention sends to the AC signal in transition minimized differential signaling the input pin of signal source front-end chip.The voltage clamping of the direct current signal meanwhile, the input pin of signal source front-end chip being received is in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.Therefore the direct current signal that, the input pin of signal source front-end chip receives is the direct current signal in the scope of direct-current coupling voltage of standard transition minimized differential signaling.The direct current signal that the direct-current coupling voltage receiving due to the input pin of signal source front-end chip is its reception and the coupled voltages of AC signal, like this, the direct-current coupling voltage that the input pin of signal source front-end chip of the present invention receives is the coupled voltages of the direct current signal in the scope of direct-current coupling voltage of AC signal in the transition minimized differential signaling that sends of HDMI (High Definition Multimedia Interface) and standard transition minimized differential signaling.
Therefore, even if the transition minimized differential signaling criteria of right and wrong signal that HDMI (High Definition Multimedia Interface) sends, the direct-current coupling voltage that the input pin of signal source front-end chip of the present invention receives is also in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.Therefore, the non-standard transition minimized differential signaling that bearing calibration of the present invention receives the input pin of signal source front-end chip is proofreaied and correct, thereby make the television set can be because signal source front-end chip cannot parse audio, video data from non-standard transition minimized differential signaling, causing cannot normal play audio, video data.
Further, before step S1 of the present invention, also comprise step:
Filter out the static comprising in the transition minimized differential signaling of HDMI (High Definition Multimedia Interface) transmission.
The present invention filters out the static comprising in the transition minimized differential signaling that HDMI (High Definition Multimedia Interface) sends, avoid in the transition minimized differential signaling of input with static signal source front-end chip is damaged.
Further, in step S2 of the present invention, AC signal in transition minimized differential signaling is sent to the input pin of signal source front-end chip to be: the AC signal in transition minimized differential signaling to be sent to after impedance matching resistance to the input pin of signal source front-end chip.
The value of impedance matching resistance R 2 is chosen according to system requirements by those of ordinary skills, and preferably, the resistance value that the present invention chooses impedance matching resistance R 2 is 100 ohm.
Owing to requiring differential lines impedance to equal 100 ohm in HDMI standard, the present invention adopts impedance matching resistance R 2 to meet the requirement of differential lines impedance when increasing therein protective circuit 1 in a physical signal lines.
These are only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. the correcting circuit of a transition minimized differential signaling, it is characterized in that, the input of described correcting circuit connects HDMI (High Definition Multimedia Interface), the input pin of the output connecting signal source front-end chip of described correcting circuit, and described correcting circuit comprises block isolating device part and clamps;
Described block isolating device part is for the direct-current coupling voltage of the transition minimized differential signaling that filters out described HDMI (High Definition Multimedia Interface) and send and the AC signal in described transition minimized differential signaling is inputed to the input pin of described signal source front-end chip;
Described clamps is for providing clamper to the direct current signal in the scope of the direct-current coupling voltage of standard transition minimized differential signaling, and the direct current signal in the scope of the direct-current coupling voltage of standard transition minimized differential signaling inputed to the input pin of described signal source front-end chip.
2. circuit according to claim 1, it is characterized in that, described clamps is pull-up resistor, described pull-up resistor one end connects the power supply mating with it, the other end connects the input pin of described signal source front-end chip, and the output voltage of described power supply is in the scope of the direct-current coupling voltage of standard transition minimized differential signaling.
3. circuit according to claim 2, is characterized in that, the output voltage of described power supply is the maximum direct-current coupling voltage of standard transition minimized differential signaling.
4. circuit according to claim 1, is characterized in that, described block isolating device part is capacitance.
5. circuit according to claim 1, is characterized in that, described correcting circuit also comprises electrostatic protection chip, and one end of described electrostatic protection chip connects described HDMI (High Definition Multimedia Interface), and the other end connects described block isolating device part.
6. circuit according to claim 1, is characterized in that, described correcting circuit also comprises impedance matching resistance, and one end of described impedance matching resistance connects described block isolating device part, and the other end connects the input pin of described signal source front-end chip.
7. a television set with the correcting circuit of transition minimized differential signaling, comprise HDMI (High Definition Multimedia Interface), signal source front-end chip and main control chip, it is characterized in that, also comprise the correcting circuit as described in claim 1-6 any one, the transition minimized differential signaling that described correcting circuit sends described HDMI (High Definition Multimedia Interface) is proofreaied and correct, and the transition minimized differential signaling after proofreading and correct is sent to the input pin of described signal source front-end chip, described signal source front-end chip parses correct audio, video data from the transition minimized differential signaling receiving, and send it to main control chip to complete the output of audio, video data.
8. a bearing calibration for transition minimized differential signaling, is characterized in that, described bearing calibration comprises:
Filter out the direct-current coupling voltage in the transition minimized differential signaling that HDMI (High Definition Multimedia Interface) sends;
AC signal in described transition minimized differential signaling is sent to the input pin of signal source front-end chip, and provide direct current signal in the scope of direct-current coupling voltage of a standard transition minimized differential signaling to input to the input pin of described signal source front-end chip.
9. guard method according to claim 8, is characterized in that, described in filter out and also comprise step before the direct-current coupling voltage in the transition minimized differential signaling that HDMI (High Definition Multimedia Interface) sends:
Filter out the static comprising in the transition minimized differential signaling of described HDMI (High Definition Multimedia Interface) transmission.
10. guard method according to claim 8; it is characterized in that, describedly send to the input pin of signal source front-end chip to be the AC signal in described transition minimized differential signaling: the AC signal in described transition minimized differential signaling is sent to after impedance matching resistance to the input pin of signal source front-end chip.
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| CN103138119A (en) * | 2011-11-23 | 2013-06-05 | 天津市天堰医教科技开发有限公司 | USB data line with overvoltage and overcurrent protection |
| US20130308232A1 (en) * | 2012-05-16 | 2013-11-21 | Nxp B.V. | Protection circuit |
| CN202931466U (en) * | 2012-11-01 | 2013-05-08 | 深圳Tcl新技术有限公司 | Lvds output adjusting device and television |
| CN103414933A (en) * | 2013-07-29 | 2013-11-27 | 华为技术有限公司 | Analog video signal output device and electronic device |
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