CN201039353Y - Selection recognition circuit for multi-channel signal source interface - Google Patents
Selection recognition circuit for multi-channel signal source interface Download PDFInfo
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- CN201039353Y CN201039353Y CNU2007200204767U CN200720020476U CN201039353Y CN 201039353 Y CN201039353 Y CN 201039353Y CN U2007200204767 U CNU2007200204767 U CN U2007200204767U CN 200720020476 U CN200720020476 U CN 200720020476U CN 201039353 Y CN201039353 Y CN 201039353Y
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Abstract
The utility model discloses a gating identification circuit used for multiple signal source interfaces, comprising multiple signal source interfaces, a first switch circuit and a main controller. Multiple alternative channels of the first switch circuit are connected correspondingly with power pins of the multiple signal source interfaces. A selective end of the channel receives selective signals output by the main controller. The common end is connected with one of an input end of the main controller. After the input end of the main controller receives a high level signal, the main controller outputs a handshaking signal to a corresponding interface of the selective signal and controls output signals of an outer signal source device connected with the interface. Through the detection of the power pins of the multiple signal source interfaces, the utility model identifies the signal input or not of the checked signal source interface and is provided with a data connection channel between the outer signal source device and the receiving device in the state that signal input continues. The utility model realizes that the received device identifies the gating conditions of the multiple signal source interfaces.
Description
Technical field
The utility model belongs to channel handoff technique field, specifically, relates to a kind of control circuit that is used for the signal input state of multipath signal source interface is discerned and switched gating.
Background technology
Along with the continuous development of Display Technique, the HDMI interface also more and more becomes a kind of important display port.The English full name of HDMI is " High Definition Multimedia ", is that a kind of digital video signal and audio signal of collecting is in the advanced interfaces mode of a port.The HDMI interface can provide the data transfer bandwidth up to 5Gbps, can transmit the audio signal and the high definition video signal that do not have compression, need not simultaneously to transmit advance capable D/A or mould/number conversion at signal, can guarantee that the video-audio signal of first water transmits.Because the digitlization and the high integration of HDMI interface transmission signals, the HDMI interface is adopted by increasing signal source equipment, as high definition DVD, high-quality computer and Digital Video etc.Television set for realizing HDMI digital signal displaying the play on television set, all is provided with the HDMI input port as most important video display terminal among the domestic consumer on the tv product of producing at present.But, on existing television equipment, the HDMI input port generally has only one, once can only connect one tunnel outside HDMI signal source, select different signal source equipments need between different input terminals, carry out manual plug and switch, make troubles for user's operation.
Based on this, on some present high-end TV product, all be provided with multichannel HDMI interface, can connect the outside HDMI signal source equipment of multichannel simultaneously, thereby effectively avoid the manual plug of user to switch the trouble of bringing, convenient for users to use.But we know, television set can only be exported data in one road signal source equipment at synchronization, therefore, how to realize television set effective choice switching between multipath signal source interface, and then the signalling channel gating of the user being chosen and signal input is arranged inserts television set, is that present television set is made one of subject matter that industry needs to be resolved hurrily.
The utility model content
Goal of the invention of the present utility model is to provide a kind of gating identification circuit that is applicable to multipath signal source interface, to realize the accurate automatic switchover of electric equipment between its multipath signal source interface.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of gating identification circuit that is used for multipath signal source interface, comprise multipath signal source interface, first commutation circuit and master controller, corresponding with the power pins of the multipath signal source interface respectively connection of the alternative passage of the multichannel of described first commutation circuit, the channel selecting termination is received the channel selecting signal of master controller output, and common port connects wherein one road input of described master controller; When described master controller receives high level signal at its input, to the pairing interface output of described channel selecting signal handshake, the outside source apparatus output signal that control is connected with described interface.
Wherein, described handshake exports the hot-swappable detection pin of the pairing interface of described channel selecting signal to.The external signal source device thinks that receiving equipment is ready to when receiving this handshake, and then to receiving equipment output audio, video data signal.
Further, in described gating identification circuit, also include second commutation circuit, the common port of described second commutation circuit receives the handshake of described master controller output, the channel selecting termination is received the channel selecting signal of master controller output, the alternative passage of multichannel respectively with the corresponding connection of hot-swappable detection pin of multipath signal source interface.
Selectable, described master controller transmits described handshake by the corresponding connection of hot-swappable detection pin of its multichannel IO mouth with multipath signal source interface.
In the utility model, described signal source interface is HDMI interface or DVI interface, and its differential signal output pin connects the audio frequency and video input channel of audio frequency and video treatment facility.
Again further, in described gating identification circuit, also include the 3rd commutation circuit, many groups of alternative passages of described the 3rd commutation circuit respectively with the corresponding connection of differential signal output pin of described multipath signal source interface, common port connects the audio frequency and video input channel of audio frequency and video treatment facility, and the channel selecting termination is received the channel selecting signal of described master controller output.
Specifically, in the utility model, described signal source interface comprises three the tunnel; Described first, second commutation circuit adopts the switching chip that includes three tunnel alternative passages at least to realize.Described the 3rd commutation circuit adopts the switching chip that includes three groups of alternative passages at least to realize, include input multiplexer in every group of alternative passage, the number of described input multiplexer equates with the differential signal output pin and the bus pin number sum of signal source interface at least.
Preferably, described first, second switching chip can adopt SP3T analog switch chip TS5A3357 to realize.
Compared with prior art, advantage of the present utility model and good effect are: the utility model detects by the power pins to a plurality of signal source interfaces, and then identify selected signal source interface no signal input is arranged, and the data connecting path of setting up under the state of signal input between external signal source device and the receiving equipment is being arranged, thereby realized the gating identification of receiving equipment to its multipath signal source interface with simple circuit configuration, has stable work in work, control is simple, save characteristics such as resource, for the gating identification circuit of signal source interface provides a kind of good with reference to mode.
Description of drawings
Fig. 1 is the circuit theory diagrams of HDMI interface in the utility model;
Fig. 2 is first switching chip and the peripheral circuit catenation principle figure thereof in the utility model;
Fig. 3 is second switching chip and the peripheral circuit catenation principle figure thereof in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
The utility model aims to provide a kind of Redundancy Design method that is used for the identification of multipath signal source interface gating, specifically comprises multipath signal source interface, first commutation circuit and master controller.Wherein, corresponding with the power pins of the multipath signal source interface respectively connection of the alternative passage of the multichannel of described first commutation circuit, the channel selecting termination is received the channel selecting signal of master controller output, and common port connects wherein one road input of described master controller.The signal source selection instruction that described master controller sends according to the user, generate corresponding channel selecting signal and export first commutation circuit to, and then control the connecting path that described first commutation circuit is communicated with its common port and the alternative passage of choosing, the input that is about to master controller is connected with the power pins of selected signal source interface, thus, the high-low level state that master controller can receive according to its input, whether decision is to the pairing interface output of described channel selecting signal handshake.
When described master controller received high level signal, thinking had signal source to insert.At this moment, master controller is to HOTPLUG handshake of signal source equipment loopback, and then sets up the proper communication passage between external signal source device and the receiving equipment.
Wherein, described handshake HOTPLUG exports the hot-swappable detection pin of the pairing interface of described channel selecting signal to.The external signal source device thinks that receiving equipment is ready to when receiving this handshake, and then to receiving equipment output audio, video data signal.
Described master controller can adopt dual mode to realize being connected between the hot-swappable detection pin of its handshake output and signal source interface.First kind of mode be, sets up second commutation circuit, utilizes its common port to receive the handshake HOTPLUG of described master controller output, and described handshake HOTPLUG can be provided by wherein one road IO mouth of master controller; The channel selecting termination of second commutation circuit is received the channel selecting signal of master controller output, the alternative passage of multichannel respectively with the corresponding connection of hot-swappable detection pin of multipath signal source interface.Described channel selecting signal can utilize at least one road IO mouth of master controller to provide equally.This connected mode cost is higher, and need set up second commutation circuit and realize, but the IO mouth resource that but helps saving master controller, only need one road IO mouth output handshake HOTPLUG can realize the gating to multipath signal source interface.The second way is, utilize the multichannel IO mouth of master controller and the hot-swappable detection pin of multipath signal source interface to connect one to one, need gating any road signal source, master controller just exports handshake HOTPLUG the hot-swappable detection pin of described signal source interface to by its corresponding IO mouth, and then sets up data communication between the two.This connected mode need not to set up auxiliary circuit, and cost is lower, but need take the more IO mouth resource of master controller, causes resource scarcity, is unfavorable for the global design of circuit board.Certainly, also can adopt existing other multiple modes to realize, the utility model is not limited to above-mentioned two kinds of forms.
Embodiment one, and the utility model is being annexation and the operation principle that example is specifically set forth the gating identification circuit at TV airborne equipment three road HDMI interfaces.Certainly, described signal source interface also can adopt interface shapes such as DVI.
Among Fig. 1, P1 is a first via HDMI interface, and its 18 pin is+the 5V power pins, offers TV receiving apparatus+5V DC power supply by the external signal source device, represents with 5V_HDMI1 among the figure.Television set of the present utility model is provided with three road such HDMI interfaces, and its power pins is respectively by resistance R 904, R902, R903 and three tunnel alternative passage NO2, the corresponding connection of NO0, NO1 of switching chip U901.Described switching chip U901 can adopt SP3T analog switch chip TS5A3357 to realize.Described switch chip TS5A3357 is a low noise and the genuine assembly of high pass, and special disposal numeral and analog signal, its low conduction impedance can be realized higher signal integrality, and then remarkable message fidelity factor is provided.The channel selecting signal of the channel selecting end N1 of switching chip U901, two- way GPIO mouth 16,17 outputs that N2 receives autonomous controller, according to the channel signal that receives, the connecting path of its corresponding alternative passage of gating and its common port COM, and then be connected with wherein one road input PWR5V of master controller by described common port COM, as shown in Figure 2.Described input PWR5V can adopt wherein one road GPIO cause for gossip of master controller existing.
When television set receives the signal source selection instruction of user's selection, for example select to be connected the signal source equipment of HDMI1 interface, master controller generates corresponding channel selecting signal at the command signal that receives, export to channel selecting end N1, the N2 that switches chip U901 by its GPIO mouth 16,17, the connecting path between chip U901 its NO2 passage of gating and the common port COM is switched in control, realizes the detection of master controller to the HDMI1 interface.If master controller detects the power pins 18 of HDMI1 interface the high level input is arranged, then thinking has the input of HDMI signal on this interface.At this moment, master controller is given handshake HOTPLUG of HDMI1 input equipment by its another road GPIO18 mouth loopback, and then the beginning normal data communication.
In order effectively to save the GPIO mouth resource of master controller, in gating identification circuit of the present utility model, also be provided with another road and switch chip U902, as shown in Figure 3.Described switching chip U902 equally also can select a SP3T analog switch chip TS5A3357 to realize, its common port COM connects the GPIO18 mouth of master controller, receives handshake HOTPLUG; Three tunnel alternative passage NO2, NO0, NO1 respectively with hot-swappable detection pin 19 pin HPDET_HDMI1, the corresponding connection of HPDET_HDMI2, HPDET_HDMI3 of three road HDMI interfaces, channel selecting end N1, N2 receive the channel selecting signal of autonomous controller GPIO mouth 16,17 outputs.In the present embodiment, switch its alternative passage NO2 of chip U902 gating, and then the handshake HOTPLUG of master controller output sent in the external signal source device that is connected with the HDMI1 interface, notify described signal source equipment to send the audio, video data signal to television set.
The gating process of two-way HDMI interface no longer describes in detail here with described HDMI1 interface in addition.
On the inner decoding plate of television set, the differential signal output pin of three road HDMI interfaces can be simultaneously be connected with audio frequency and video input channel on the decoding deck, but, the external equipment that only receives handshake HOTPLUG can input to television set with its differential data signals, other two-way HDMI interface is not owing to receive handshake HOTPLUG, and block the output of its differential signal output pin, can guarantee the operate as normal of TV set circuit like this, once only broadcast the data in the external signal source device, avoid multipath signal source to import simultaneously and cause signal to disturb, in addition chaotic.
Certainly, in order to improve the reliability of TV set circuit, also can between the audio frequency and video input channel of the differential signal output pin of three road HDMI interfaces and television set, be connected the 3rd commutation circuit.Three groups of alternative passages of described the 3rd commutation circuit respectively with the corresponding connection of differential signal output pin of three tunnel signal source interfaces, common port connects the audio frequency and video input channel of television set, and the channel selecting termination is received the channel selecting signal of master controller GPIO mouth 16,17 outputs.Described the 3rd commutation circuit can adopt the switching chip that includes three groups of alternative passages at least to realize, include input multiplexer in every group of alternative passage, the number of described input multiplexer equates with the differential signal output pin and the bus pin number sum of signal source interface at least, promptly is no less than 10 tunnel input channels.
In addition, in order to realize that television set can automatically switch on the HDMI passage of signal source input, the channel selecting signal of GPIO mouth 16,17 outputs by master controller can not set according to user instruction, switches each road alternative pathway NO2, NO1, the NO0 of chip U901 but take turns gating in the mode of similar cycle scanning.When the input PWR5V of master controller receives high level signal, think that this HDMI interface has the signal input, and then stop passage and switch, set up the data interface channel between described HDMI interface and the television set decoding deck, the user only needs to want the outside source device start watched like this, television set is automatically switched on this signal source, greatly convenient for users to use.
For the purpose of simplifying circuit, described master controller can be selected existing host CPU realization on the television set decoding deck.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1. gating identification circuit that is used for multipath signal source interface, comprise multipath signal source interface, it is characterized in that: in described gating identification circuit, also include first commutation circuit and master controller, corresponding with the power pins of the multipath signal source interface respectively connection of the alternative passage of the multichannel of described first commutation circuit, the channel selecting termination is received the channel selecting signal of master controller output, and common port connects wherein one road input of described master controller; When described master controller receives high level signal at its input, to the pairing interface output of described channel selecting signal handshake, the outside source apparatus output signal that control is connected with described interface.
2. gating identification circuit according to claim 1 is characterized in that: described handshake exports the hot-swappable detection pin of the pairing interface of described channel selecting signal to.
3. gating identification circuit according to claim 2, it is characterized in that: in described gating identification circuit, also include second commutation circuit, the common port of described second commutation circuit receives the handshake of described master controller output, the channel selecting termination is received the channel selecting signal of master controller output, the alternative passage of multichannel respectively with the corresponding connection of hot-swappable detection pin of multipath signal source interface.
4. gating identification circuit according to claim 2 is characterized in that: described master controller transmits described handshake by the corresponding connection of hot-swappable detection pin of its multichannel IO mouth with multipath signal source interface.
5. according to arbitrary described gating identification circuit in the claim 1 to 4, it is characterized in that: described master controller connects the channel selecting end of described first or second commutation circuit by its at least one road IO mouth, transmits described channel selecting signal.
6. gating identification circuit according to claim 5 is characterized in that: described signal source interface is HDMI interface or DVI interface, and its differential signal output pin connects the audio frequency and video input channel of audio frequency and video treatment facility.
7. gating identification circuit according to claim 6, it is characterized in that: in described gating identification circuit, also include the 3rd commutation circuit, many groups of alternative passages of described the 3rd commutation circuit respectively with the corresponding connection of differential signal output pin of described multipath signal source interface, common port connects the audio frequency and video input channel of audio frequency and video treatment facility, and the channel selecting termination is received the channel selecting signal of described master controller output.
8. according to arbitrary described gating identification circuit in the claim 1 to 4, it is characterized in that: described signal source interface comprises three the tunnel; Described first, second commutation circuit adopts the switching chip that includes three tunnel alternative passages at least to realize.
9. gating identification circuit according to claim 7 is characterized in that: described signal source interface comprises three the tunnel; Described the 3rd commutation circuit adopts the switching chip that includes three groups of alternative passages at least to realize, include input multiplexer in every group of alternative passage, the number of described input multiplexer equates with the differential signal output pin and the bus pin number sum of signal source interface at least.
10. gating identification circuit according to claim 8 is characterized in that: it is SP3T analog switch chip that described first, second switches chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200204767U CN201039353Y (en) | 2007-04-10 | 2007-04-10 | Selection recognition circuit for multi-channel signal source interface |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2007200204767U CN201039353Y (en) | 2007-04-10 | 2007-04-10 | Selection recognition circuit for multi-channel signal source interface |
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| CN201039353Y true CN201039353Y (en) | 2008-03-19 |
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| CNU2007200204767U Expired - Fee Related CN201039353Y (en) | 2007-04-10 | 2007-04-10 | Selection recognition circuit for multi-channel signal source interface |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101729821A (en) * | 2008-10-30 | 2010-06-09 | 康佳集团股份有限公司 | Television and method and system for automatically prompting to plug in signal source terminal |
| CN101790061A (en) * | 2010-03-10 | 2010-07-28 | 青岛海信电器股份有限公司 | Power supply control unit and engineering unit testing system |
| CN102469299A (en) * | 2010-11-19 | 2012-05-23 | Tcl新技术（惠州）有限公司 | Signal annular communication system and method of monitoring unit |
| CN101621610B (en) * | 2008-07-03 | 2012-10-17 | 深圳Tcl新技术有限公司 | Television controlling camera |
-
2007
- 2007-04-10 CN CNU2007200204767U patent/CN201039353Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621610B (en) * | 2008-07-03 | 2012-10-17 | 深圳Tcl新技术有限公司 | Television controlling camera |
| CN101729821A (en) * | 2008-10-30 | 2010-06-09 | 康佳集团股份有限公司 | Television and method and system for automatically prompting to plug in signal source terminal |
| CN101790061A (en) * | 2010-03-10 | 2010-07-28 | 青岛海信电器股份有限公司 | Power supply control unit and engineering unit testing system |
| CN102469299A (en) * | 2010-11-19 | 2012-05-23 | Tcl新技术（惠州）有限公司 | Signal annular communication system and method of monitoring unit |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080319 Termination date: 20110410 |