CN106572317A - Signal identification circuit and signal identification method - Google Patents
Signal identification circuit and signal identification method Download PDFInfo
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- CN106572317A CN106572317A CN201610976381.6A CN201610976381A CN106572317A CN 106572317 A CN106572317 A CN 106572317A CN 201610976381 A CN201610976381 A CN 201610976381A CN 106572317 A CN106572317 A CN 106572317A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims description 111
- 238000003780 insertion Methods 0.000 claims description 33
- 230000037431 insertion Effects 0.000 claims description 33
- 239000012634 fragment Substances 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
- H04N21/4424—Monitoring of the internal components or processes of the client device, e.g. CPU or memory load, processing speed, timer, counter or percentage of the hard disk space used
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Databases & Information Systems (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Dc Digital Transmission (AREA)
Abstract
A signal identification circuit and a signal identification method, the signal identification circuit is used for identifying an input signal of a signal source interface, the signal source interface comprises a multiplexing terminal and an independent terminal, the multiplexing terminal is a shared terminal of an AV signal and a YPbPr signal, the independent terminal is a non-shared terminal of the YPbPr signal, the signal identification circuit is connected with the multiplexing terminal and the independent terminal and is used for detecting the state that a signal line is inserted into the signal source interface, when the multiplexing terminal is inserted into the signal line and the independent terminal connected with the signal identification circuit is not inserted into the signal line, the input signal is the AV signal, and when the multiplexing terminal is inserted into the signal line and the independent terminal connected with the signal identification circuit is inserted into the signal line, the input signal is the YPbPr signal. The invention identifies AV signals and YPbPr signals through hardware, thereby avoiding the problem of misjudgment caused by directly judging through color carrier (ColorBurst) signals.
Description
Technical field
The present invention relates to TV technology, more particularly to a kind of signal recognition circuit and signal recognition method.
Background technology
Nowadays TV has become a part indispensable during people live.Conventional television AV (video) and color difference components
(YPbPr) interface is standard configuration interface, is required to respective picture-and-sound signal input terminal per signal all the way.With TV
Machine system gradually develops from mark translucent Tv to HDTV, while more and more lower using the application scenarios of AV and YPbPr.In order to
Meeting does not affect the function of television set input terminal, reduces again and prints plate suqare raising integrated level, and multiplexing terminal is one effective
And the method for economy.
Color difference components (YPbPr) interface includes three terminals：Y terminals, Pb terminals and Pr terminals, wherein Y terminals be AV (depending on
Frequently) and color difference components (YPbPr) interface share terminal.Situation for being multiplexed terminal is general by judging regarding in signal
Screen synchronous (SYNC) and color carrier (ColorBurst) signal are come to judge current input signal be AV or YPbPr.And foundation is sentenced
The signal input type broken, user select effective signalling channel in the Input signal source input menus of TV.
However, confirming YPbPr signals or AV letters by audio video synchronization (SYNC) and color carrier (ColorBurst) signal
Number when, when image occur be the situation of grey menu or any not colored black and white screen, cause passage to be judged by accident.
When should be that YPbPr signals are judged as AV signals.
The content of the invention
In view of above-mentioned condition, it is necessary to provide a kind of signal recognition circuit and signal recognition method, to improve signal identification
Accuracy rate.
A kind of signal recognition circuit, for the input signal of identification source interface, the signal source interface includes multiplexing
Terminal and independent terminals, the multiplexing terminal are the common terminal of AV signals and YPbPr signals, and the independent terminals are YPbPr
The non-common terminal of signal, the signal recognition circuit connection is described to be multiplexed terminal and independent terminals, inserts for signal lines
Enter the state of signal source interface, when the multiplexing terminal inserts holding wire, and the independence of the connection signal recognition circuit
When terminal is not inserted into holding wire, the input signal is AV signals, when the multiplexing terminal inserts holding wire, and connection institute
When stating the independent terminals insertion holding wire of signal recognition circuit, the input signal is YPbPr signals.
Above-mentioned signal recognition circuit, wherein, the signal recognition circuit includes：
First detection circuit, connects the multiplexing terminal, and when the multiplexing terminal insertion holding wire, first inspection
Slowdown monitoring circuit exports first signal of telecommunication, and when the multiplexing terminal is not inserted into holding wire, the first detection circuit output second is electric
Signal；
Second detection circuit, connects the independent terminals, and when the independent terminals insert holding wire, second inspection
Slowdown monitoring circuit exports first signal of telecommunication, and when the independent terminals are not inserted into holding wire, the second detection circuit output second is electric
Signal；
Signal determining module, connects the outfan of the first detection circuit and the second detection circuit, for according to described
The signal of telecommunication of the first detection circuit and the second detection circuit output determines the type of the input signal, when the described first detection electricity
Road exports first signal of telecommunication, and during the second detection second signal of telecommunication of circuit output, the signal of the input is AV signals, when
When the first detection circuit and the second detection circuit export first signal of telecommunication, the signal of input is YPbPr signals.
Above-mentioned signal recognition circuit, wherein, it is described first detection circuit and second detection circuit include switch module and
The signal generating circuit being connected between the switch module and the determining module, the signal generating circuit include being connected to
First resistor and second resistance between power supply and the determining module, described switch module one end connect the first resistor and
Node between second resistance, other end connection ground wire, the switch module is also connected with the signal source interface, when the signal
During source interface insertion holding wire, the switch module disconnects the connection of the signal generating circuit and ground wire, first detection
Circuit or second detection first signal of telecommunication of circuit output, when the signal source interface does not access holding wire, the switch module
Turn on the connection of the signal generating circuit and the ground wire, the output second of the first detection circuit or the second detection circuit
The signal of telecommunication.
Above-mentioned signal recognition circuit, wherein, the switch module includes the shell fragment being arranged in the signal source interface, when
During the holding wire insertion signal source interface, shell fragment produces deformation, and the switch module disconnects the signal generating circuit and institute
State the connection of ground wire.
The embodiment of the present invention additionally provides a kind of signal recognition method, for the input signal of identification source interface, institute
Stating signal source interface includes being multiplexed terminal and independent terminals, and the multiplexing terminal is the common terminal of AV signals and YPbPr signals,
Non-common terminal of the independent terminals for YPbPr signals, it is characterised in that the multiplexing terminal and independent terminals connection signal
Identification circuit, methods described include：
Detect whether the signal source interface inserts holding wire by signal recognition circuit；
When the multiplexing terminal insertion holding wire, and the independent terminals of the connection signal recognition circuit are not inserted into letter
During number line, determine that the input signal is AV signals；
When the multiplexing terminal insertion holding wire, and the independent terminals of the connection signal recognition circuit insert signal
During line, determine that the input signal is YPbPr signals.
Said method, wherein, it is described to detect whether the signal source interface inserts holding wire by signal recognition circuit
Step includes：
The signal of telecommunication exported by the signal recognition circuit determines whether the signal source interface inserts holding wire.
Said method, wherein, the signal recognition circuit includes the first detection circuit, the connection for connecting the multiplexing terminal
Second detection circuit of the independent terminals, and connect the letter of the outfan of the first detection circuit and the second detection circuit
Number determining module, the signal of telecommunication exported by the signal recognition circuit determine whether the signal source interface inserts signal
The step of line, includes：
When described first detection first signal of telecommunication of circuit output, the signal determining module determines that the multiplexing terminal is inserted
Enter the holding wire；
When described first detection second signal of telecommunication of circuit output, the signal determining module determines the multiplexing terminal not
Insert the holding wire；
When described second detection first signal of telecommunication of circuit output, the signal determining module determines that the independent terminals are inserted
Enter the holding wire；
When described second detection second signal of telecommunication of circuit output, the signal determining module determines the independent terminals not
Insert the holding wire.
Said method, wherein, the first detection circuit and the second detection circuit include：
Switch module and the signal generating circuit being connected between the switch module and the determining module, the signal
Produce first resistor and second resistance that circuit includes being connected between power supply and the determining module, described switch module one end
Connect the node between the first resistor and second resistance, other end connection ground wire, the switch module connect the signal
Source interface, when the signal source interface inserts holding wire, the switch module disconnects the signal generating circuit with ground wire
Connection, the first detection circuit or second detection first signal of telecommunication of circuit output, when the signal source interface does not access signal
During line, the switch module turns on the connection of the signal generating circuit and the ground wire, the first detection circuit or second
Second signal of telecommunication of output of detection circuit.
Said method, wherein, the switch module includes the shell fragment being arranged in the signal source interface, when the signal
During line insertion signal source interface, shell fragment produces deformation, and the switch module disconnects the connection of the first resistor and the ground wire.
The present invention is by designing the signal recognition circuit of connection multiplexing port and separate port, according to the insertion shape of holding wire
State determines the type of input signal, when the multiplexing terminal insertion holding wire, and connects the independent terminals of signal recognition circuit not
During insertion holding wire, input signal is AV signals, when multiplexing terminal insertion holding wire, and connects the separate end of signal recognition circuit
During son insertion holding wire, input signal is YPbPr signals.Input signal is judged for AV signals or YPbPr signals by hardware,
So as to avoid the problem that the erroneous judgement for producing directly is judged by color carrier (ColorBurst) signal.
Description of the drawings
Fig. 1 is the structural representation of the signal recognition circuit that first embodiment of the invention is proposed；
Fig. 2 is the structural representation of the signal recognition circuit that second embodiment of the invention is proposed；
Fig. 3 is the structural representation of the signal recognition circuit that third embodiment of the invention is proposed；
Fig. 4 is the flow chart of the signal recognition method that the embodiment of the present invention is proposed.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
With reference to explained below and accompanying drawing, it will be clear that in terms of these and other of embodiments of the invention.In these descriptions
In accompanying drawing, some particular implementations in embodiments of the invention are specifically disclosed, represent the enforcement for implementing the present invention
Some modes of the principle of example, but it is to be understood that the scope of embodiments of the invention is not limited.Conversely, the present invention
Embodiment includes all changes, modification and the equivalent fallen in the range of the spirit and intension of attached claims.
In the embodiment of the present invention, AV (video) interface includes composite video (Cvbs) terminal, color difference components (YPbPr)
Interface includes Y terminals, Pb terminals and Pr terminals.Wherein, composite video (Cvbs) terminal and Y terminals share a terminal, i.e., multiple
With terminal, Pb terminals and Pr terminals are independent terminals.Signal recognition circuit in the embodiment of the present invention is for slotting according to holding wire
The input signal for entering to be multiplexed the state recognition access signal source interface of terminal and independent terminals is AV (video) or color difference components
(YPbPr).When the multiplexing terminal insertion holding wire, and the independent terminals of the connection signal recognition circuit are not inserted into letter
During number line, the input signal is AV signals, when the multiplexing terminal insertion holding wire, and the connection signal identification electricity
During the independent terminals insertion holding wire on road, the input signal is YPbPr signals.
Fig. 1 is referred to, is the signal recognition circuit in first embodiment of the invention, including being connected to the signal source interface
41,42 the first detection detection circuit 20 of circuit 10, second, and connect the first detection circuit 10 and the second detection circuit
The signal determining module 30 of 20 outfan.The determining module 30 is, for example, the SOC (System-on-a- of television set
Chip), the signal of telecommunication for being exported according to the described first detection circuit 10 and the second detection circuit 20 determines the input signal
For AV signals or YPbPr signals.
In the present embodiment, the first detection circuit 10 connects the multiplexing terminal 41 and the signal determining module 30,
For the State- output signal of telecommunication according to the holding wire insertion multiplexing terminal 41.That is, when the multiplexing terminal 41 insertion signal
During line, the first detection circuit 10 exports first signal of telecommunication, when the multiplexing terminal 41 is not inserted into holding wire, described first
Detection circuit 10 exports second signal of telecommunication.
The second detection circuit 20 connects the independent terminals 42 and the signal determining module 30, for according to signal
Line inserts the State- output signal of telecommunication of the independent terminals 42.That is, when the Pb terminals 42 insert holding wire, second inspection
Slowdown monitoring circuit 20 exports first signal of telecommunication, when the Pb terminals 42 are not inserted into holding wire, the second detection circuit 20 output the
Two signals of telecommunication
The signal determining module 30 receives the signal of telecommunication of the first detection circuit 10 and the second detection output of circuit 20,
And determine the type of the input signal.As shown in table 1, it is when the described first detection circuit 10 exports first signal of telecommunication and described
When second detection circuit 20 exports second signal of telecommunication, the signal determining module 30 determines that the input signal is AV signals；When
When the first detection circuit 10 and the second detection circuit 20 export first signal of telecommunication, the signal determining module 30 determines institute
Input signal is stated for YPbPr signals.
The signal of telecommunication of the detection circuit output of table 1. and the type of input signal
| Detection circuit | AV signals | YPbPr signals | No signal is input into |
| First detection circuit (Y/Cvbs) | First signal of telecommunication | First signal of telecommunication | Second signal of telecommunication |
| Second detection circuit (Pb) | Second signal of telecommunication | Second signal of telecommunication | Second signal of telecommunication |
Input letter is able to ensure that binding signal identification circuit and by way of judging color carrier (ColorBurst) signal
Number identification accuracy.When to avoid the occurrence of image be the situation of grey menu or any not colored black and white screen,
Input signal is caused to be judged by accident.
The present invention is by designing the signal recognition circuit of connection multiplexing port and separate port, according to the insertion shape of holding wire
State determines the type of input signal, when the multiplexing terminal insertion holding wire, and connects the independent terminals of signal recognition circuit not
During insertion holding wire, input signal is AV signals, when multiplexing terminal insertion holding wire, and connects the separate end of signal recognition circuit
During son insertion holding wire, input signal is YPbPr signals.Input signal is judged for AV signals or YPbPr signals by hardware,
So as to avoid the problem that the erroneous judgement for producing directly is judged by color carrier (ColorBurst) signal.
It should be understood that the second detection circuit can also be connected between Pr terminals and signal determining module, with reference to first
Signal identification principle in embodiment, equally can determine that the type of input signal.
Fig. 2 is referred to, is the signal recognition circuit in second embodiment of the invention, which is known with the signal in first embodiment
The structure of other circuit is essentially identical, and difference is that second measurement circuit design two, one of them second detection are electric
Road 20 is connected between the 30 of the Pb terminals 42 and the signal determining module, another second detection circuit 20a be connected to and
Between Pr terminals 42a and the signal determining module 30.In the present embodiment second detection the circuit output signal of telecommunication principle with
It is identical in first embodiment.As shown in table 2, when the described first detection circuit 10 exports first signal of telecommunication, and two described the
Two detection circuits 20, when 20a exports second signal of telecommunication, the signal determining module 30 determines the input signal and believes for AV
Number；When the described first detection circuit 10 exports first signal of telecommunication, two the second detection circuits 20,20a export the first telecommunications
Number when, the signal determining module 30 determine the input signal be YPbPr signals.
The signal of telecommunication of the detection circuit output of table 2. and the type of input signal
Fig. 3 is referred to, is the signal recognition circuit in third embodiment of the invention, base of the present embodiment in first embodiment
Further improved on plinth.As shown in figure 3, the first detection circuit and the second principle phase for detecting the circuit output signal of telecommunication
Together, its structure is also essentially identical, including switch module and the letter being connected between the switch module and the determining module
Number produce circuit.Illustrate the principle of the present embodiment below by taking the first detection circuit as an example.
The first detection circuit includes switch module s1 and is connected to the switch module S1 and the signal determines mould
Signal generating circuit 11 between block 30.The switch module S1 is connected with multiplexing terminal, and inserts signal by being multiplexed terminal
The state control of line disconnects and closure.
The signal generating circuit 11 include first resistor R1 being connected between power supply STB and the determining module 30 and
Second resistance R2.Described switch module S1 one end connects the node between first resistor R1 and second resistance R2, the other end
Connection ground wire, when the multiplexing terminal insertion holding wire, the switch module S1 disconnects the signal generating circuit 11 with ground
The connection of line, the first detection circuit 10 output first signal of telecommunication, the i.e. high level signal, when the signal source interface is not accessed
During holding wire, the switch module S1 turns on the connection of the signal generating circuit 11 and the ground wire, the first detection electricity
Road 10 exports second signal of telecommunication, i.e. low level signal.
Further, the switch module S1 includes the shell fragment being arranged in the signal source interface, when holding wire is inserted
During signal source interface, shell fragment produces deformation, disconnects the connection of the signal generating circuit 11 and ground wire, and signal generating circuit passes through
Pull-up resistor is that first resistor produces a high level signal of telecommunication, and is exported to signal determining module 30.Do not have in terminal is multiplexed
When having insertion holding wire, in the raw, signal generating circuit connects ground wire, the voltage of the first detection circuit output end to shell fragment
For 0V, the low signal of telecommunication is exported.
It should be noted that the signal recognition circuit is not limited only to the identification to AV signals and YPbPr signals, as long as tool
There is signal source interface, just according to the insertion of holding wire come the signal of telecommunication of control circuit output, and then the class of input signal can be judged
Type.
And, it is suitable for the interface of every kind of input signal has the situation of multiple independent terminals.For example a-signal and
The interface of B signal shares a multiplexing terminal, and a-signal and B signal have 2 independent terminals, the second detection electricity under the situation
Road typically connects in the independent terminals of same type of input signal, for example, be connected in the independent terminals of a-signal.Work as multiplexing
During the first detection high signal of telecommunication of circuit output of terminal connection, if the high signal of telecommunication of the second detection circuit output, signal source connects
The signal of mouth input is a-signal；If the low signal of telecommunication of the second detection circuit output, the signal being input into is B signal.
Fig. 4 is referred to, the embodiment of the present invention additionally provides a kind of signal recognition method, for the defeated of identification source interface
Enter signal, the signal source interface includes being multiplexed terminal and independent terminals, and the multiplexing terminal is AV signals and YPbPr signals
Common terminal, non-common terminal of the independent terminals for YPbPr signals, the multiplexing terminal and independent terminals connection signal are known
Other circuit, methods described include：
By signal recognition circuit, step S11, detects whether the signal source interface inserts holding wire；
Step S12, when the multiplexing terminal inserts holding wire, and the independent terminals of the connection signal recognition circuit
When being not inserted into holding wire, determine that the input signal is AV signals；
Step S13, when the multiplexing terminal inserts holding wire, and the independent terminals of the connection signal recognition circuit
During insertion holding wire, determine that the input signal is YPbPr signals.
Further, in above-mentioned steps, according to the signal of telecommunication of output, the signal recognition circuit determines that the signal source connects
Whether mouth inserts holding wire.
Further, the signal recognition circuit includes connecting the first detection circuit of the multiplexing terminal, connects described
The second of independent terminals detects circuit, and connection described first detects that the signal of the outfan of circuit and the second detection circuit is true
Cover half block, the signal of telecommunication exported by the signal recognition circuit determine whether the signal source interface inserts holding wire
Step includes：
When described first detection first signal of telecommunication of circuit output, the signal determining module determines that the multiplexing terminal is inserted
Enter the holding wire；
When described first detection second signal of telecommunication of circuit output, the signal determining module determines the multiplexing terminal not
Insert the holding wire；
When described second detection first signal of telecommunication of circuit output, the signal determining module determines that the independent terminals are inserted
Enter the holding wire；
When described second detection second signal of telecommunication of circuit output, the signal determining module determines the independent terminals not
Insert the holding wire.
Signal identification in the structure of the identification circuit and above-mentioned first embodiment, second embodiment or 3rd embodiment
The principle of the structure and signal identification of circuit is identical, therefore the present embodiment is repeated no more.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
Example ", or the description of " some examples " etc. mean specific features with reference to the embodiment or example description, structure, material or spy
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example are referred to necessarily.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
These embodiments can be carried out with various changes, modification, replacement and modification in the case of the principle and objective that depart from the present invention, this
The scope of invention is limited by claim and its equivalent.
Claims (9)
1. a kind of signal recognition circuit, for the input signal of identification source interface, the signal source interface includes being multiplexed end
Son and independent terminals, the multiplexing terminal are AV signals and the common terminal of YPbPr signals, and the independent terminals are that YPbPr believes
Number non-common terminal, it is characterised in that the signal recognition circuit connection multiplexing terminal and independent terminals, for detecting
Holding wire inserts the state of signal source interface, and when the multiplexing terminal insertion holding wire, and the connection signal identification is electric
When the independent terminals on road are not inserted into holding wire, the input signal is AV signals, when the multiplexing terminal inserts holding wire, and institute
When stating the independent terminals insertion holding wire for connecting the signal recognition circuit, the input signal is YPbPr signals.
2. signal recognition circuit as claimed in claim 1, it is characterised in that the signal recognition circuit includes：
First detection circuit, connects the multiplexing terminal, and when the multiplexing terminal insertion holding wire, the first detection electricity
Road exports first signal of telecommunication, when the multiplexing terminal is not inserted into holding wire, the first detection second signal of telecommunication of circuit output；
Second detection circuit, connects the independent terminals, and when the independent terminals insert holding wire, the second detection electricity
Road exports first signal of telecommunication, when the independent terminals are not inserted into holding wire, the second detection second signal of telecommunication of circuit output；
Signal determining module, connects the outfan of the first detection circuit and the second detection circuit, for according to described first
The signal of telecommunication of detection circuit and the second detection circuit output determines the type of the input signal, when the described first detection circuit it is defeated
Go out first signal of telecommunication, and during the second detection second signal of telecommunication of circuit output, the signal of the input is AV signals, when described
When first detection circuit and the second detection circuit export first signal of telecommunication, the signal of input is YPbPr signals.
3. signal recognition circuit as claimed in claim 2, it is characterised in that the first detection circuit and the second detection circuit
Include switch module and the signal generating circuit being connected between the switch module and the determining module, the signal is produced
Raw circuit includes first resistor and the second resistance being connected between power supply and the determining module, and described switch module one end connects
The node between the first resistor and second resistance is connect, other end connection ground wire, the switch module are also connected with the signal
Source interface, when the signal source interface inserts holding wire, the switch module disconnects the signal generating circuit with ground wire
Connection, the first detection circuit or second detection first signal of telecommunication of circuit output, when the signal source interface does not access signal
During line, the switch module turns on the connection of the signal generating circuit and the ground wire, the first detection circuit or second
Second signal of telecommunication of output of detection circuit.
4. signal recognition circuit as claimed in claim 3, it is characterised in that the switch module includes being arranged on the signal
Shell fragment in source interface, when the holding wire inserts signal source interface, shell fragment produces deformation, and the switch module disconnects described
The connection of signal generating circuit and the ground wire.
5. a kind of signal recognition method, for the input signal of identification source interface, the signal source interface includes being multiplexed end
Son and independent terminals, the multiplexing terminal are AV signals and the common terminal of YPbPr signals, and the independent terminals are that YPbPr believes
Number non-common terminal, it is characterised in that the multiplexing terminal and independent terminals connection signal recognition circuit, methods described bag
Include：
Detect whether the signal source interface inserts holding wire by signal recognition circuit；
When the multiplexing terminal insertion holding wire, and the independent terminals of the connection signal recognition circuit are not inserted into holding wire
When, determine that the input signal is AV signals；
When the multiplexing terminal insertion holding wire, and the independent terminals of the connection signal recognition circuit insert holding wire
When, determine that the input signal is YPbPr signals.
6. method as claimed in claim 5, it is characterised in that described that the signal source interface is detected by signal recognition circuit
The step of whether inserting holding wire includes：
The signal of telecommunication exported by the signal recognition circuit determines whether the signal source interface inserts holding wire.
7. method as claimed in claim 6, it is characterised in that the signal recognition circuit includes connecting the multiplexing terminal
First detection circuit, the second detection circuit for connecting the independent terminals, and connect the first detection circuit and the second inspection
The signal determining module of the outfan of slowdown monitoring circuit, the signal of telecommunication exported by the signal recognition circuit determine the signal
The step of whether source interface inserts holding wire includes：
When described first detection first signal of telecommunication of circuit output, the signal determining module determines the multiplexing terminal insertion institute
State holding wire；
When described first detection second signal of telecommunication of circuit output, the signal determining module determines that the multiplexing terminal is not inserted into
The holding wire；
When described second detection first signal of telecommunication of circuit output, the signal determining module determines the independent terminals insertion institute
State holding wire；
When described second detection second signal of telecommunication of circuit output, the signal determining module determines that the independent terminals are not inserted into
The holding wire.
8. method as claimed in claim 6, it is characterised in that the first detection circuit and the second detection circuit include：
Include switch module and the signal generating circuit being connected between the switch module and the determining module, the letter
Number producing circuit includes the first resistor and the second resistance that are connected between power supply and the determining module, the switch module one
Node between the end connection first resistor and second resistance, other end connection ground wire, the switch module connect the letter
Number source interface, when the signal source interface inserts holding wire, the switch module disconnects the signal generating circuit and ground wire
Connection, it is described first detection circuit or second detection first signal of telecommunication of circuit output, when the signal source interface does not access letter
During number line, the switch module turns on the connection of the signal generating circuit and the ground wire, the first detection circuit or the
Second signal of telecommunication of output of two detection circuits.
9. method as claimed in claim 8, it is characterised in that the switch module includes being arranged in the signal source interface
Shell fragment, when the holding wire inserts signal source interface, shell fragment produces deformation, and the switch module disconnects the first resistor
With the connection of the ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610976381.6A CN106572317A (en) | 2016-11-07 | 2016-11-07 | Signal identification circuit and signal identification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610976381.6A CN106572317A (en) | 2016-11-07 | 2016-11-07 | Signal identification circuit and signal identification method |
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| Publication Number | Publication Date |
|---|---|
| CN106572317A true CN106572317A (en) | 2017-04-19 |
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ID=58540147
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610976381.6A Pending CN106572317A (en) | 2016-11-07 | 2016-11-07 | Signal identification circuit and signal identification method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111699396A (en) * | 2018-08-20 | 2020-09-22 | 深圳配天智能技术研究院有限公司 | Signal detection circuit and vehicle-mounted computer |
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