CN208273094U - A kind of video signal output circuit and video camera - Google Patents
A kind of video signal output circuit and video camera Download PDFInfo
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- CN208273094U CN208273094U CN201820791420.XU CN201820791420U CN208273094U CN 208273094 U CN208273094 U CN 208273094U CN 201820791420 U CN201820791420 U CN 201820791420U CN 208273094 U CN208273094 U CN 208273094U
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Abstract
The utility model embodiment provides a kind of video signal output circuit and video camera, is applied to technical field of video monitoring, the circuit includes: switching key, video frequency signal processing master chip, TVI converter, selected on-off circuit and bnc interface；Switching key is connect with video frequency signal processing master chip；Video frequency signal processing master chip is connect with TVI converter, for exporting parallel video output signals to TVI converter, or CVBS vision signal is exported to selected on-off circuit；TVI converter is between video frequency signal processing master chip and selected on-off circuit；Selected on-off circuit is connect with TVI converter, video frequency signal processing master chip and bnc interface respectively, for exporting TVI vision signal or CVBS vision signal to bnc interface；Bnc interface is connect with selected on-off circuit.The utility model embodiment can make the output of bnc interface two kinds of vision signal of support.
Description
Technical field
The utility model relates to technical field of video monitoring, more particularly to a kind of video signal output circuit and camera shooting
Machine.
Background technique
In technical field of video monitoring, IPC (Internet Protocol Camera, web camera) equipment is a kind of
By traditional cameras, generated a new generation's video camera, current IPC equipment support network output, CVBS in conjunction with network technology
(Composite Video Broadcast Signal, Composite Video Baseband Signal) output or HD-TVI (High
Definition Transport Video Interface, HD video coffret) it exports, HD-TVI is referred to as TVI.
Single video transmission technologies based on BNC (Bayonet Nut Connector, snap-fit connector) interface
In, a bnc interface of IPC equipment can only export one of TVI vision signal or CVBS vision signal vision signal.
In fact, the vision signal output format of bnc interface has been configured in IPC equipment production process, Yong Hu
It cannot be modified in use process, that is to say, that in use, the vision signal output format of bnc interface is cannot
It is switched between two kinds of vision signals.Therefore, an existing bnc interface can only actually support TVI vision signal or
The output of one of CVBS vision signal vision signal.In this way, if user uses the IPC of only one bnc interface
Equipment then needs to set using the IPC of another different output formats when needing to obtain the vision signal of another format
It is standby, higher cost.
As it can be seen that how to realize that a bnc interface supports two kinds of vision signals of TVI and CVBS in user's use process
The problem of output is urgent need to resolve.
Utility model content
The utility model embodiment is designed to provide a kind of video signal output circuit and video camera, to realize one
Bnc interface supports the output of two kinds of vision signals.Specific technical solution is as follows:
The utility model embodiment provides a kind of video signal output circuit, is applied to video camera, the vision signal
Output circuit includes: that switching key, video frequency signal processing master chip, TVI converter, selected on-off circuit and snap-fit connect
Connect device bnc interface；
The switching key is connect with the video frequency signal processing master chip, for the video frequency signal processing main core
The signal output format of piece switches over；
The video frequency signal processing master chip is connect with the TVI converter, for being TVI view in signal output format
When frequency signal, obtains parallel video output signals and export to the TVI converter；Or, being CVBS view in signal output format
When frequency signal, obtains CVBS vision signal and export to the selected on-off circuit；
The TVI converter, between the video frequency signal processing master chip and the selected on-off circuit；
The selected on-off circuit is connect with the TVI converter, video frequency signal processing master chip and bnc interface respectively,
For the signal output format in the video frequency signal processing master chip be TVI vision signal when, it is defeated to receive the TVI converter
TVI vision signal out is exported to the bnc interface；Or, the signal output format in the video frequency signal processing master chip is
When CVBS vision signal, the CVBS vision signal for receiving the video frequency signal processing master chip output is exported to the bnc interface；
The bnc interface is connect with the selected on-off circuit, for exporting TVI vision signal or CVBS vision signal.
Optionally, the video signal output circuit further include:
TVI video signal driver is set between the selected on-off circuit and the TVI converter, for pair
The TVI vision signal of the TVI converter output carries out video filtering amplification, and the TVI vision signal after obtaining filter and amplification is defeated
Out to the selected on-off circuit.
Optionally, the video signal output circuit further include:
CVBS video filtering amplifier, is set between the selected on-off circuit and video frequency signal processing master chip, uses
It is filtered amplification in the CVBS vision signal exported to the video frequency signal processing master chip, the CVBS after obtaining filter and amplification
Vision signal is exported to the selected on-off circuit.
Optionally, the selected on-off circuit a, comprising: control port, two input ports and an output port；
The control port is connected with the video frequency signal processing master chip, for receiving the video frequency signal processing main core
The control signal that piece is sent；
An input port in described two input ports is connected with the TVI video signal driver, is used for
When the signal output format of the video frequency signal processing master chip is TVI vision signal, accept filter amplified TVI video letter
Number；Another input port is connected with the CVBS video filtering amplifier, in the video frequency signal processing master chip
When signal output format is CVBS vision signal, accept filter amplified CVBS vision signal；
The output port is connected with the bnc interface, for being regarded the TVI after filter and amplification according to the control signal
CVBS vision signal after frequency signal or filter and amplification is exported to the bnc interface.
Optionally, the TVI video signal driver includes: two TVI video video filter amplifiers, and this two
The serial connection of TVI video filtering amplifier, a TVI video filtering amplifier are connect with the TVI converter, another TVI
Video filtering amplifier is connect with the selected on-off circuit.
Optionally, the switching key are as follows: touch-key or mechanical key or virtual key are real by reset key
It is existing.
Optionally, the TVI converter is TP2801 chip.
Optionally, the video frequency signal processing master chip is sent out the parallel video output signals by BT1120 agreement
It send to the TVI converter.
Optionally, the video frequency signal processing master chip is Digital Signal Processing dsp chip.
The utility model embodiment provides a kind of video camera, comprising: imaging sensor and view described in any of the above embodiments
Frequency signal output apparatus；
Described image sensor obtains mobile industry processor interface MIPI for handling the optical signal of acquisition
The picture signal of agreement, and the picture signal of the MIPI agreement is exported to the vision signal of the video signal output circuit
Processing main chip.
Video signal output circuit and video camera provided by the embodiment of the utility model, comprising: switching key, vision signal
Processing main chip, TVI converter, selected on-off circuit and bnc interface；Switching key is connect with video frequency signal processing master chip,
It is switched over for the signal output format to video frequency signal processing master chip；Video frequency signal processing master chip, with TVI converter
Connection, for obtaining parallel video output signals and exporting to TVI converter when signal output format is TVI vision signal；
Or, obtaining CVBS vision signal when signal output format is CVBS vision signal and exporting to selected on-off circuit；TVI conversion
Device is between video frequency signal processing master chip and selected on-off circuit；Selected on-off circuit is used in video frequency signal processing main core
When the signal output format of piece is TVI vision signal, the TVI vision signal for receiving the output of TVI converter is exported to bnc interface；
Or, receiving video frequency signal processing master chip when the signal output format of video frequency signal processing master chip is CVBS vision signal
The CVBS vision signal of output is exported to bnc interface；Bnc interface is connect with selected on-off circuit, for exporting TVI vision signal
Or CVBS vision signal.
The utility model embodiment determines that bnc interface is defeated by the switching key connecting with video frequency signal processing master chip
The format of vision signal out so that the output of two kinds of vision signals can be supported by realizing a bnc interface, and selects to switch
Circuit can only retain a cabling and be connected to bnc interface, can be avoided printed wiring board cabling bifurcated, effectively inhibit electromagnetism dry
It disturbs and the problems such as impedance mismatch, to realize the lossless output of vision signal.Certainly, implement any product of the utility model
Or method does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structure chart of the video signal output circuit of the utility model embodiment；
Fig. 2 is another structure chart of the video signal output circuit of the utility model embodiment；
Fig. 3 is the two stage filter amplification treatment circuit structure chart of the utility model embodiment；
The circuit structure diagram of CVBS video filtering amplifier in Fig. 4 the utility model embodiment；
Fig. 5 is the selected on-off circuit structure chart of the utility model embodiment；
Fig. 6 is the stream that video frequency signal processing master chip carries out the switching of vision signal output format in the utility model embodiment
Cheng Tu；
Fig. 7 is the pin connection schematic diagram of TP2801 chip；
Fig. 8 is the structure chart of the video camera of the utility model embodiment.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
In order to solve in the prior art, user use video camera during, a bnc interface cannot support TVI and
The problem of CVBS two kinds of vision signals output, the utility model embodiment provide a kind of video signal output circuit and camera shooting
Machine, to realize that a bnc interface supports the output of two kinds of vision signals.
It describes in detail first below to video signal output circuit provided by the utility model embodiment.
Referring to Fig. 1, Fig. 1 is a kind of structure chart of the video signal output circuit of the utility model embodiment, applied to taking the photograph
Camera, video camera may include: IPC equipment and analog video camera.Wherein, video signal output circuit includes: at vision signal
Manage master chip 100, switching key 200, TVI converter 300, selected on-off circuit 400 and bnc interface 500.
Switching key 200 is connect with video frequency signal processing master chip 100, for video frequency signal processing master chip 100
Signal output format switches over；
Video frequency signal processing master chip 100 is connect with TVI converter 300, for being TVI video in signal output format
When signal, obtains parallel video output signals and export to TVI converter 300；Or, being CVBS video letter in signal output format
Number when, obtain CVBS vision signal and export to selected on-off circuit 400；
TVI converter 300, between video frequency signal processing master chip 100 and selected on-off circuit 400；
Selected on-off circuit 400, respectively with TVI converter 300, video frequency signal processing master chip 100 and bnc interface 500
Connection, for the signal output format in video frequency signal processing master chip 100 be TVI vision signal when, receive TVI converter
The TVI vision signal of 300 outputs is exported to bnc interface 500；Or, in the signal output format of video frequency signal processing master chip 100
When for CVBS vision signal, receives the CVBS vision signal that video frequency signal processing master chip 100 exports and export to bnc interface 500；
Bnc interface 500 is connect with selected on-off circuit 400, for exporting TVI vision signal or CVBS vision signal.
In the video signal output circuit of the utility model embodiment, switching key 200 is used for video frequency signal processing master
The signal output format of chip 100 switches over, and video frequency signal processing master chip 100 is used in signal output format be TVI view
When frequency signal, obtains parallel video output signals and export to TVI converter 300；Or, being CVBS video in signal output format
When signal, obtains CVBS vision signal and export to selected on-off circuit 400；Selected on-off circuit 400, respectively with TVI converter
300, video frequency signal processing master chip 100 and bnc interface 500 connect, defeated for the signal in video frequency signal processing master chip 100
When format is TVI vision signal out, receives the TVI vision signal that TVI converter 300 exports and export to bnc interface 500；Or,
When the signal output format of video frequency signal processing master chip 100 is CVBS vision signal, video frequency signal processing master chip 100 is received
The CVBS vision signal of output is exported to bnc interface 500；Bnc interface 500 is for exporting TVI vision signal or CVBS video letter
Number.The utility model embodiment determines bnc interface by the switching key 200 connecting with video frequency signal processing master chip 100
The format of 500 output vision signals, to realize that a bnc interface 500 can support the output of two kinds of vision signals.And it selects
Selecting switching circuit 400 can only one cabling of reservation be connected to bnc interface 500, can be avoided printed wiring board cabling bifurcated, have
Effect inhibits the problems such as electromagnetic interference and impedance mismatch, to realize the lossless output of vision signal.
Referring to fig. 2, Fig. 2 is another structure chart of the video signal output circuit of the utility model embodiment, such as Fig. 2 institute
Show, on the basis of the present embodiment embodiment shown in Fig. 1, is provided between selected on-off circuit 400 and TVI converter 300
TVI video signal driver 600 is provided with CVBS between selected on-off circuit 400 and video frequency signal processing master chip 100
Video filtering amplifier 700.Wherein,
TVI video signal driver 600, the TVI vision signal for exporting to TVI converter 300 carry out video filter
Wave amplification, the TVI vision signal after obtaining filter and amplification are exported to selected on-off circuit 400.
As shown in Fig. 2, TVI video signal driver 600 may include two TVI video filtering amplifiers, i.e. TVI view
Frequency filter amplifier 601 and TVI video filtering amplifier 602, and two TVI video filtering amplifier serial connections, TVI view
Frequency filter amplifier 602 is connect with TVI converter 300, and is placed close to TVI converter 300, TVI video filtering amplifier
601 connect with selected on-off circuit 400, and place close to selected on-off circuit 400, certainly, TVI video filtering amplifier
Other electronic devices, such as resistance can also be connected between 601 and TVI video filtering amplifier 602.On the one hand, turn close to TVI
High-frequency Interference and the low frequency pulsating letter that the TVI video filtering amplifier 602 of parallel operation 300 can inhibit TVI converter 300 to export
Number, and be conducive to the signal removing of second level filter amplifier and filtering out for interference wave by amplified signal；Another party
Face, the TVI video filtering amplifier 601 close to selected on-off circuit 400 can effectively inhibit too long in the pcb board in video camera
The crosstalk and coupled noise that cabling introduces.In this way, can be believed after two stage filter enhanced processing with the video of outputting high quality
Number, so that signal effectively be avoided to filter the bad caused image ripple of unclean or amplification effect, snowflake and color distortion etc.
Problem.It is the two stage filter amplification treatment circuit structure chart of the utility model embodiment referring to Fig. 3, Fig. 3.As can be seen that from TVI
The TVI vision signal that converter 300 exports, exports TVI_ after first order filter and amplification and second level filter and amplification respectively
OUT vision signal, the TVI_OUT vision signal are exported to selected on-off circuit 400.
CVBS video filtering amplifier 700, CVBS vision signal for being exported to video frequency signal processing master chip 100 into
Row filter and amplification, the CVBS vision signal after obtaining filter and amplification are exported to selected on-off circuit 400.
Specifically, this is practical since the picture quality that the highest frequency of CVBS vision signal is lower and shows is relatively low
The CVBS video that new embodiment can export video frequency signal processing master chip 100 by CVBS video filtering amplifier 700
Signal is filtered amplification.Referring to fig. 4, in Fig. 4 the utility model embodiment CVBS video filtering amplifier circuit structure diagram.
As it can be seen that the video letter after CVBS_OUT vision signal is inputted the CVBS video filtering amplifier 700, after obtaining filter and amplification
Number, i.e. CVBS_OUT_BNC vision signal can input CVBS_OUT_BNC vision signal by selected on-off circuit 400
Bnc interface 500.In this way, the CVBS vision signal interference noise of output is effectively inhibited and filtered out, and improve effectively
The quality of signal.
As shown in Fig. 2, the selected on-off circuit 400 in the present embodiment, comprising: a control port, two input ports
With an output port；Control port is connected with video frequency signal processing master chip 100, for receiving video frequency signal processing master chip
The 100 control signals sent；An input port in two input ports is connected with TVI video signal driver 600, uses
When the signal output format in video frequency signal processing master chip 100 is TVI vision signal, accept filter amplified TVI view
Frequency signal；Another input port is connected with CVBS video filtering amplifier 700, in video frequency signal processing master chip 100
Signal output format be CVBS vision signal when, accept filter amplified CVBS vision signal；Output port and bnc interface
500 are connected, for according to control signal that the TVI vision signal after filter and amplification or the CVBS vision signal after filter and amplification is defeated
Out to bnc interface 500.
It is the selected on-off circuit structure chart of the utility model embodiment referring to Fig. 5, Fig. 5, U31 selects end to use 10K electricity
(RD22) ground connection is hindered, guarantees default conditions, the capacitor by adding 10uF guarantees electricity in selected on-off circuit 400 for decoupling
Flat stability.In addition, it is defeated to execute signal after determining that executing signal output format switches for video frequency signal processing master chip 100
Format switches out, and sends control signal to selected on-off circuit 400, for example, Model_signal level is drawn high.Selection is opened
It is low level that Model_signal level is defaulted on powered-down road 400, exports TVI vision signal, when Model_signal level is height
When be switched to CVBS vision signal output.
In the utility model embodiment, if the TVI vision signal of the output of TVI converter 300 and video frequency signal processing master
The CVBS vision signal and bnc interface 500 that chip 100 exports are directly connected to, and form two cablings, cabling bifurcated will cause electricity
The problems such as magnetic disturbance and impedance mismatch, and selected on-off circuit 400, can only retain a cabling and bnc interface 500 connect
It is logical, it can be avoided PCB (Printed Circuit Board, printed wiring board) cabling bifurcated, effectively inhibit electromagnetic interference and resistance
The problems such as anti-mismatch, to realize the lossless output of vision signal.
In the video signal output circuit of the utility model embodiment, switching key 200 is used for video frequency signal processing master
The signal output format of chip 100 switches over, and video frequency signal processing master chip 100 is used in signal output format be TVI view
When frequency signal, obtains parallel video output signals and export to TVI converter 300；Or, being CVBS video in signal output format
When signal, obtains CVBS vision signal and export to selected on-off circuit 400；Two TVI video filterings positioned at different location are put
Big device is respectively used to be filtered amplification, CVBS video filtering amplifier 700 to the TVI vision signal that TVI converter 300 exports
For being filtered amplification to CVBS vision signal；Selected on-off circuit 400, in video frequency signal processing master chip 100
When signal output format is TVI vision signal, received TVI vision signal is exported to bnc interface 500；Or, in vision signal
When the signal output format of processing main chip 100 is CVBS vision signal, received CVBS vision signal is exported to bnc interface
500；Bnc interface 500 is for exporting TVI vision signal or CVBS vision signal.The utility model embodiment with video by believing
The switching key 200 that number processing main chip 100 connects determines that bnc interface 500 exports the format of vision signal, to realize one
A bnc interface can support the output of two kinds of vision signals.Pass through TVI video filtering amplifier and CVBS video filtering amplifier
The quality that output vision signal can be improved can only retain a cabling by selection switch 400 and be connected to bnc interface 500,
The problems such as to avoid PCB trace bifurcated from causing electromagnetic interference and impedance mismatch, realizes the lossless output of vision signal.
Switching key 200 in Fig. 1 and embodiment illustrated in fig. 2 can be touch-key or mechanical key or virtual
Key is realized by reset key, is switched over for the signal output format to video frequency signal processing master chip 100.
In the utility model embodiment, reset key can be multiplexed, it will be to video frequency signal processing master chip 100
The function that signal output format switches over is added in reset key, can also be realized by the switching key 200 newly increased
Switching to the signal output format of video frequency signal processing master chip 100.Switching key 200 and reset key are specifically used for connecing
When receiving the trigger action of user, the level of video frequency signal processing master chip 100 is switched over.
Video frequency signal processing master chip 100, the duration for being also used to be switched when itself level are less than default switching duration, and
When signal output format is TVI vision signal, the signal output format of video frequency signal processing master chip is switched to CVBS view
Frequency signal；Or, being CVBS video letter when the duration that itself level is switched is less than default switching duration, and in signal output format
Number when, the signal output format of video frequency signal processing master chip is switched to TVI vision signal.
Video frequency signal processing master chip 100, the duration for being also used to be switched when itself level switch duration not less than default
When, video camera is resetted.
Below by taking switching key 200 is realized by reset key as an example, to the vision signal of video frequency signal processing master chip 100
The process of output format switching is described in detail.
It is that video frequency signal processing master chip carries out vision signal output format in the utility model embodiment referring to Fig. 6, Fig. 6
The flow chart of switching, includes the following steps:
S601, video camera starting.
S602 reads reset key.
Specifically, video camera is after start-up, reset key is read, video camera is initialized.
S603, judges whether reset key is triggered.
In this step, if user carries out trigger action to reset key, S604 is executed.
S604 starts timing.
By being to be determined to execute the switching of signal output format according to triggering duration of the user to reset key in this present embodiment
Or video camera is resetted, specifically, when reset key is triggered, to the level of video frequency signal processing master chip 100
It switches over, for example, the level of video frequency signal processing master chip 100 is changed into low level by high level, when user no longer triggers
When reset key, the level of video frequency signal processing master chip 100 is changed into high level by low level again.Therefore, in user to multiple
When position key carries out trigger action, timing can be carried out according to the level, thus obtain that reset key is triggered when
It is long.When the duration that the level of video frequency signal processing master chip 100 is switched is less than default switching duration, to signal output format
It switches over, when the duration that the level of video frequency signal processing master chip 100 is switched is not less than default switching duration, to camera shooting
Machine is resetted.
S605 judges whether to be greater than default triggering duration.
In the utility model embodiment, maloperation in order to avoid user to video camera, for example, user accidentally touches
Reset key, after starting timing, it is first determined whether be greater than default triggering duration (default triggering duration is usually shorter,
For example, a length of 1s when default triggering), if not, showing that user may be maloperation, S602 is re-executed, that is, reads to reset and press
Key.If it is greater than default triggering duration, S606 is executed.
S606 judges whether to be less than default switching duration.
Specifically, default switching duration is to execute the maximum time of signal output format switching, which is greater than default touching
Duration is sent out, for example, can be 5s.If beyond the default switching duration, show user to the trigger action of reset key when
Long overlength resets video camera, re-executes S601 later then executing S609.Otherwise, S607 is executed.
S607 executes the switching of signal output format.
S608 terminates.
For above-mentioned process, for example, video camera default output TVI vision signal, video camera initializes after powering on, depending on
Audio signalprocessing master chip 100 is to received MIPI (Mobile Industry Processor Interface, mobile industry
Processor interface) picture signal of agreement handled, obtains parallel video output signals and export to TVI converter 300,
TVI converter 300 exports TVI vision signal after converting to received parallel video output signals.If user triggers
Reset key when a length of 3s (for example, a length of 1s when default triggering, presets a length of 4s when switching), then execute signal output format
Switching exports CVBS vision signal；If user triggers the when a length of 5s of reset key, video camera will reset, and video camera is again
Initialization.
By vision signal output format switching flow shown in fig. 6,100 basis of video frequency signal processing master chip is realized
The duration that reset key is triggered distinguish determine execute signal output format switching or video camera is resetted.Due to resetting
Key is the reserved Initialize installation reset key of video camera, for initializing to video camera.In this way, reset key in addition to
Have the function of except resetting video camera, the vision signal that video camera can also be made to export switches to different formats.
In the utility model embodiment, the video frequency signal processing master chip 100 in Fig. 2 embodiment can be DSP
(Digital Signal Processing, Digital Signal Processing) chip, video frequency signal processing master chip 100 generally includes more
The meaning of a pin, each pin is as shown in Table 1.
Table one
Video frequency signal processing master chip 100 can directly export CVBS vision signal, and cannot directly export TVI video letter
Number.But video frequency signal processing master chip 100 obtains simultaneously after being handled the picture signal of received MIPI agreement
Parallel video output signals are exported to TVI converter 300, are obtained by TVI converter 300 by capable video output signals
TVI vision signal.
TVI converter 300 in Fig. 4 embodiment is a kind of signal of the serial TVI data of parallel BT1120 protocol data turn
Parallel video output signals can be sent to by converter, therefore, video frequency signal processing master chip 100 by BT1120 agreement
TVI converter.TVI converter 300 can be TP2801 chip, between TP2801 chip and video frequency signal processing master chip 100
Outside the communication for carrying out vision signal except through BT1120 agreement, IIC (Inter-Integrated can also be passed through
Circuit, IC bus) transmission other information, coaxial cable is transferred to eventually by video output.In addition to this,
TP2801 chip can also receive the relevant information of coaxial view control by coaxial cable, then will control information transmitting by IIC
To video frequency signal processing master chip side.Referring to Fig. 7, Fig. 7 is the pin connection schematic diagram of TP2801 chip, each in TP2801 chip
The electrical connection of pin can be found in table two.
Table two
| Pin | Electrical connection |
| 1 | Coaxial view control signal |
| 2 | The reset of TVI signal conversion chip |
| 3 | Grounding |
| 4 | 3.3V power supply |
| 5 | Ground connection |
| 6 | 2.94K resistive pull-downs |
| 7 | Ground connection |
| 8 | The output of TVI vision signal |
| 9 | Ground connection |
| 10 | 3.3V power supply |
| 11-14、17-20、24-31 | The parallel port BT1120 video data |
| 15 | 3.3V power supply |
| 16 | Ground connection |
| 21、40 | 1.2V power supply |
| 22 | Ground connection |
| 23 | 74.25M clock |
| 32、33 | IIC clock |
| 34、35 | Ground connection |
| 37 | 74.25MHz clock |
| 38 | Interrupt pin meets DSP |
| 39 | Ground connection |
It can be seen that pin 11-14,17-20,24-31 are for receiving parallel video output signals (the i.e. parallel port BT1120
Video data), after handling the parallel port BT1120 video data, TVI vision signal is exported by pin 8.In addition,
Reseting pin (pin 2) the default level of TP2801 chip is high level, and signal passes through level-one RC (Resistance-
Capacitance, resistance-capacitance) filter circuit, 10 ohm of resistance value selection, capacitance selection 100nF avoids electromagnetic interference from believing
Number cause reset signal unstable, and then influences vision signal and export quality.Since TP2801 chip belongs to the prior art, herein
No longer describe in detail to other pins.
The utility model embodiment additionally provides a kind of video camera, and referring to Fig. 8, Fig. 8 is taking the photograph for the utility model embodiment
The structure chart of camera, comprising: imaging sensor 801 and video signal output circuit 802；Imaging sensor 801, for that will acquire
The picture signal of MIPI agreement export to the video frequency signal processing master chip of video signal output circuit 802；Vision signal is defeated
Circuit 802 can be the video signal output circuit in Fig. 1 embodiment or Fig. 2 embodiment out.
Wherein, imaging sensor 801 is used to handle the optical signal of acquisition, obtains the picture signal of MIPI agreement,
And the picture signal of MIPI agreement is exported to the video frequency signal processing master chip of video signal output circuit 802, vision signal
Processing main chip is used to believe the image of MIPI agreement when signal output format is TVI vision signal or CVBS vision signal
It number is handled, obtains parallel video output signals or CVBS vision signal；And when according to user to the triggering of switching key
It is long, it determines and executes the switching of signal output format；TVI converter is parallel for exporting to received video frequency signal processing master chip
Video output signals converted, obtain TVI vision signal；Selected on-off circuit is used in video frequency signal processing master chip
When signal output format is TVI vision signal, the TVI vision signal for receiving the output of TVI converter is exported to bnc interface, or,
When the signal output format of video frequency signal processing master chip is CVBS vision signal, the output of video frequency signal processing master chip is received
CVBS vision signal is exported to bnc interface, and bnc interface is for exporting TVI vision signal or CVBS vision signal.
The video signal output circuit of video camera in the utility model embodiment, according to user to switching key trigger when
It is long, it determines and executes the switching of signal output format, realize the format for switching bnc interface output vision signal by switching key,
To realize that a bnc interface can support the output of two kinds of vision signals.In this way, even if only one bnc interface of video camera,
Also two kinds of vision signals of TVI and CVBS can be exported, when users use, TVI can be switched by the triggering to reset key
With two kinds of vision signals of CVBS.Certainly, video camera can only export two kinds of vision signals of TVI and CVBS when exporting vision signal
One of.
The above is only the preferred embodiment of the utility model only, is not intended to limit the protection model of the utility model
It encloses.Any modification, equivalent substitution, improvement and etc. made within the spirit and principle of the present invention, are all contained in this reality
With in novel protection scope.
Claims (10)
1. a kind of video signal output circuit, which is characterized in that be applied to video camera, the video signal output circuit includes:
Switching key, video frequency signal processing master chip, video transmission interface TVI converter, selected on-off circuit and snap-fit connect
Connect device bnc interface；
The switching key is connect with the video frequency signal processing master chip, for the video frequency signal processing master chip
Signal output format switches over；
The video frequency signal processing master chip is connect with the TVI converter, for being TVI video letter in signal output format
Number when, obtain parallel video output signals and export to the TVI converter；Or, being that composite video is wide in signal output format
When broadcasting signal CVBS vision signal, obtains CVBS vision signal and export to the selected on-off circuit；
The TVI converter, between the video frequency signal processing master chip and the selected on-off circuit；
The selected on-off circuit connect with the TVI converter, video frequency signal processing master chip and bnc interface respectively, is used for
When the signal output format of the video frequency signal processing master chip is TVI vision signal, the TVI converter output is received
TVI vision signal is exported to the bnc interface；Or, the signal output format in the video frequency signal processing master chip is CVBS
When vision signal, the CVBS vision signal for receiving the video frequency signal processing master chip output is exported to the bnc interface；
The bnc interface is connect with the selected on-off circuit, for exporting TVI vision signal or CVBS vision signal.
2. video signal output circuit according to claim 1, which is characterized in that the video signal output circuit also wraps
It includes:
TVI video signal driver is set between the selected on-off circuit and the TVI converter, for described
TVI converter output TVI vision signal carry out video filtering amplification, the TVI vision signal after obtaining filter and amplification export to
The selected on-off circuit.
3. video signal output circuit according to claim 2, which is characterized in that the video signal output circuit also wraps
It includes:
CVBS video filtering amplifier, is set between the selected on-off circuit and video frequency signal processing master chip, for pair
The CVBS vision signal of the video frequency signal processing master chip output is filtered amplification, the CVBS video after obtaining filter and amplification
Signal is exported to the selected on-off circuit.
4. video signal output circuit according to claim 3, which is characterized in that the selected on-off circuit, comprising: one
A control port, two input ports and an output port；
The control port is connected with the video frequency signal processing master chip, for receiving the video frequency signal processing master chip hair
The control signal sent；
An input port in described two input ports is connected with the TVI video signal driver, for described
When the signal output format of video frequency signal processing master chip is TVI vision signal, accept filter amplified TVI vision signal；
Another input port is connected with the CVBS video filtering amplifier, for the signal in the video frequency signal processing master chip
When output format is CVBS vision signal, accept filter amplified CVBS vision signal；
The output port is connected with the bnc interface, for being believed the TVI video after filter and amplification according to the control signal
Number or filter and amplification after CVBS vision signal export to the bnc interface.
5. video signal output circuit according to claim 2, which is characterized in that the TVI video signal driver
It include: two TVI video video filter amplifiers, and two TVI video filtering amplifier serial connections, a TVI video
Filter amplifier is connect with the TVI converter, another TVI video filtering amplifier is connect with the selected on-off circuit.
6. video signal output circuit according to claim 1, which is characterized in that the switching key are as follows: touch to press
Key or mechanical key or virtual key are realized by reset key.
7. video signal output circuit according to claim 1, which is characterized in that the TVI converter is TP2801 core
Piece.
8. video signal output circuit according to claim 7, which is characterized in that the video frequency signal processing master chip is logical
It crosses BT1120 agreement and the parallel video output signals is sent to the TVI converter.
9. video signal output circuit according to claim 1, which is characterized in that the video frequency signal processing master chip is
Digital Signal Processing dsp chip.
10. a kind of video camera characterized by comprising imaging sensor and video according to any one of claims 1 to 9 letter
Number output circuit；
Described image sensor obtains mobile industry processor interface MIPI agreement for handling the optical signal of acquisition
Picture signal, and the picture signal of the MIPI agreement is exported to the video frequency signal processing of the video signal output circuit
Master chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820791420.XU CN208273094U (en) | 2018-05-25 | 2018-05-25 | A kind of video signal output circuit and video camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820791420.XU CN208273094U (en) | 2018-05-25 | 2018-05-25 | A kind of video signal output circuit and video camera |
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| CN208273094U true CN208273094U (en) | 2018-12-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109743474A (en) * | 2019-03-18 | 2019-05-10 | 延锋伟世通电子科技（上海）有限公司 | A kind of single-ended camera signals processing circuit of highly resistance immunity |
-
2018
- 2018-05-25 CN CN201820791420.XU patent/CN208273094U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109743474A (en) * | 2019-03-18 | 2019-05-10 | 延锋伟世通电子科技（上海）有限公司 | A kind of single-ended camera signals processing circuit of highly resistance immunity |
| CN109743474B (en) * | 2019-03-18 | 2023-04-25 | 延锋伟世通电子科技（上海）有限公司 | High-noise-immunity single-ended camera signal processing circuit |
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