CN107222704A - A kind of video formats switching method and device - Google Patents
A kind of video formats switching method and device Download PDFInfo
- Publication number
- CN107222704A CN107222704A CN201710473956.7A CN201710473956A CN107222704A CN 107222704 A CN107222704 A CN 107222704A CN 201710473956 A CN201710473956 A CN 201710473956A CN 107222704 A CN107222704 A CN 107222704A
- Authority
- CN
- China
- Prior art keywords
- power supply
- target video
- voltage
- video
- video frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a kind of video formats switching method and device, methods described includes：According to the magnitude of voltage of the power supply in predetermined time period, the frequency of power supply is determined；According to the frequency of power supply and the frequency and the corresponding relation of video formats that pre-save, target video standard is determined；According to the target video standard of the determination, the video formats that itself is supported switch to the target video standard.Due in embodiments of the present invention, according to the magnitude of voltage of the power supply in predetermined time period, the frequency of power supply can be determined, and then frequency according to power supply and the frequency and the corresponding relation of video formats that pre-save can determine target video standard, the video formats that itself is supported switch to the target video standard, so that the problem of avoiding due to influenceing video playing quality caused by user's selection video formats mistake.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of video formats switching method and device.
Background technology
In field of video monitoring, video generally has line-by-line inversion (Phase Alteration Line, PAL) and state's household electrical appliances
Depending on two kinds of standards of standard committee (National Television System Committee, NTSC), both standards are
Can not be compatible, if selection pal mode plays the video of TSC-system formula, or selection TSC-system formula on an electronic device
Play the video of pal mode, then picture will become black and white, thus electronic equipment when playing video, it is necessary to set electronics
The standard of standby upper selection is identical with the standard of the video to be played.
General electronic equipment can support the broadcasting of both standard videos of PAL and NTSC, but user is using
, it is necessary to which user understands the relevant knowledge of video formats during electronic equipment, so as to select video formats on an electronic device, so make
Into the inconvenient for use of user, and if user selects mistake, the play quality of video will be influenceed.
But there is presently no a kind of solution for the adaptive switching that can realize video formats.
The content of the invention
The embodiments of the invention provide a kind of video formats switching method and device, to solve because user selects video
Caused by standard mistake the problem of influence video playing quality.
The embodiments of the invention provide a kind of video formats switching method, this method includes：
According to the magnitude of voltage of the power supply in predetermined time period, the frequency of power supply is determined；
According to the frequency of power supply and the frequency and the corresponding relation of video formats that pre-save, target video system is determined
Formula；
According to the target video standard of the determination, the video formats that itself is supported switch to the target video system
Formula.
Further, the frequency according to power supply and the frequency and the corresponding relation of video formats that pre-save,
Determine after target video standard, methods described also includes：
According to the target video standard of the determination and the video formats and the corresponding relation of video frame rate that pre-save, really
Set the goal video frame rate；
According to the target video frame per second of the determination, the video frame rate that itself is supported switches to the target video frame
Rate.
Further, the target video standard according to the determination and the video formats and video frame rate that pre-save
Corresponding relation, determine that target video frame per second includes：
According to the target video standard of the determination and the video formats and the corresponding relation of video frame rate that pre-save, really
The corresponding each video frame rate of the fixed target video standard；
According to each video frame rate of determination and the maximum video frame rate itself preserved recognized, target video frame is determined
Rate.
Further, the target video standard according to the determination, the video formats that itself is supported switch to institute
Stating target video standard includes：
Whether output selects the prompt message of the target video standard；
If user selects the target video standard, the video formats that itself is supported switch to the target video system
Formula.
Further, the magnitude of voltage of the power supply according in predetermined time period, determines the frequency of power supply
Before, methods described also includes：
Judge power supply for AC power or dc source；
If AC power, subsequent step is carried out；
If dc source, the DC voltage of dc source is filtered out, the ripple voltage of dc source is obtained, to the line
Wave voltage is amplified processing, using the ripple voltage after enhanced processing as the voltage of power supply, carries out subsequent step.
On the other hand, the embodiments of the invention provide a kind of video formats switching device, described device includes：
First determining module, for the magnitude of voltage according to the power supply in predetermined time period, determines power supply
Frequency；
Second determining module, for the frequency according to power supply and the frequency pre-saved pass corresponding with video formats
System, determines target video standard；
First handover module, for the target video standard according to the determination, the video formats itself supported are switched
For the target video standard.
Further, described device also includes：
Second handover module, for the target video standard according to the determination and the video formats and video that pre-save
The corresponding relation of frame per second, determines target video frame per second；According to the target video frame per second of the determination, the frame of video that itself is supported
Rate switches to the target video frame per second.
Further, second handover module, specifically for the target video standard according to the determination and advance guarantor
The video formats and the corresponding relation of video frame rate deposited, determine the corresponding each video frame rate of the target video standard；According to true
Fixed each video frame rate and the maximum video frame rate itself preserved recognized, determine target video frame per second.
Further, whether first handover module, the prompting of the target video standard is selected specifically for output
Information；If user selects the target video standard, the video formats that itself is supported switch to the target video standard.
Further, described device also includes：
Judge module, for judging power supply for AC power or dc source, if AC power, triggering the
One determining module；If dc source, the DC voltage of dc source is filtered out, the ripple voltage of dc source is obtained, to institute
State ripple voltage and be amplified processing, regard the ripple voltage after enhanced processing as the voltage of power supply, the determination of triggering first
Module.
Further, first determining module includes first resistor, second resistance, voltage-stabiliser tube, the first optocoupler, the 3rd electricity
Resistance and the 4th resistance, wherein,
One end connection power supply input of first resistor, the reference electricity of the other end respectively with second resistance and voltage-stabiliser tube
Pole is connected；
One end ground connection that second resistance is not connected with first resistor；
Light emitting diode in one end connection first voltage input of 3rd resistor, the other end the first optocoupler of connection is just
Pole；
The plus earth of voltage-stabiliser tube, negative electrode connects the negative pole of the light emitting diode in the first optocoupler；
4th resistance one end connection second voltage input, the other end respectively with the phototriode in the first optocoupler
Colelctor electrode and input/output port connection；
The grounded emitter of phototriode in first optocoupler.
Further, first determining module includes the 5th resistance, the 6th resistance and the second optocoupler, wherein,
Light emitting diode in one end connection power supply input of 5th resistance, the other end the second optocoupler of connection is just
Pole；
6th resistance one end connection tertiary voltage input, the other end respectively with the phototriode in the second optocoupler
Colelctor electrode and analog-digital converter connection；
The negative pole ground connection of light emitting diode in second optocoupler；
The grounded emitter of phototriode in second optocoupler.
The embodiments of the invention provide a kind of video formats switching method and device, methods described includes：According to it is default when
Between power supply in length magnitude of voltage, determine the frequency of power supply；According to the frequency of power supply and pre-save
The corresponding relation of frequency and video formats, determines target video standard；According to the target video standard of the determination, itself is propped up
The video formats held switch to the target video standard.Due in embodiments of the present invention, according in predetermined time period
The magnitude of voltage of power supply, it may be determined that the frequency of power supply, and then frequency and the frequency pre-saved according to power supply
The corresponding relation of rate and video formats can determine target video standard, and the video formats that itself is supported switch to the target
Video formats, so that the problem of avoiding due to influenceing video playing quality caused by user's selection video formats mistake.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, makes required in being described below to embodiment
Accompanying drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of video formats handoff procedure schematic diagram provided in an embodiment of the present invention；
Fig. 2 is a kind of circuit diagram that the embodiment of the present invention 4 is provided；
Fig. 3 A are that the magnitude of voltage for the power supply that the embodiment of the present invention 4 is provided changes with time waveform；
Fig. 3 B are that the magnitude of voltage of the power supply after the halfwave rectifier that the embodiment of the present invention 4 is provided changes with time ripple
Shape；
Fig. 3 C are the level change waveform after the halfwave rectifier that the embodiment of the present invention 4 is provided；
Fig. 4 is another circuit diagram that the embodiment of the present invention 4 is provided；
Fig. 5 is a kind of video formats switching device structural representation provided in an embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, it is clear that described embodiment is only this
The a part of embodiment of invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art exist
The all other embodiment obtained under the premise of creative work is not made, the scope of protection of the invention is belonged to.
Embodiment 1：
Fig. 1 is a kind of video formats handoff procedure schematic diagram provided in an embodiment of the present invention, and the process comprises the following steps：
S101：According to the magnitude of voltage of the power supply in predetermined time period, the frequency of power supply is determined.
Video formats switching method provided in an embodiment of the present invention be applied to electronic equipment, the electronic equipment include PC,
The equipment such as intelligent television and mobile phone.
Video formats generally include pal mode and TSC-system formula, wherein, the frequency of every kind of video formats and power supply is
There is corresponding relation, in order to realize the adaptive switching of video formats, electronic equipment it needs to be determined that the frequency of power supply.
On the electronic equipment after electricity, the magnitude of voltage of the power supply in predetermined time period can be obtained, according to default
The magnitude of voltage of power supply in time span, it may be determined that the frequency of power supply.Wherein it is possible to be adopted by existing voltage
Collector obtains the magnitude of voltage of power supply, by installing timer in the electronic device, it may be determined that in predetermined time period
Power supply magnitude of voltage, and then determine power supply frequency.
For example, according to the magnitude of voltage of the power supply in the predetermined time period of acquisition, learning the magnitude of voltage of power supply
The waveform changed over time is a sine wave, records the sine wave interior execution cycle per second by timer for 50 times, then
The frequency for determining power supply is 50Hz.
S102：According to the frequency of power supply and the frequency and the corresponding relation of video formats that pre-save, target is determined
Video formats.
Because the frequency of every kind of video formats and power supply has corresponding relation, it is determined that the frequency of power supply
Afterwards, the frequency and video formats of power supply are pre-saved in the adaptive switchings of video formats, electronic equipment in order to realize
Corresponding relation, according to the frequency of power supply and the frequency and the corresponding relation of video formats that pre-save, by with determination
The corresponding video formats of frequency of power supply are defined as target video standard.
For example, the frequency of the power supply pre-saved in electronic equipment and the corresponding relation of video formats are power supply
Frequency be 50Hz, corresponding video formats be pal mode；The frequency of power supply is 60Hz, and corresponding video formats are
TSC-system formula.If according to the magnitude of voltage of the power supply in predetermined time period, the frequency for determining power supply is 50Hz, then
According to the frequency of the power supply pre-saved and the corresponding relation of video formats, it is pal mode to determine target video standard；Such as
Fruit is according to the magnitude of voltage of the power supply in predetermined time period, and the frequency for determining power supply is 60Hz, then according to guarantor in advance
The frequency for the power supply deposited and the corresponding relation of video formats, it is TSC-system formula to determine target video standard.
S103：According to the target video standard of the determination, the video formats that itself is supported switch to the target to regard
Frequency standard.
Electronic equipment be while support pal mode and TSC-system formula both standards, it is determined that after target video standard,
Electronic equipment can by itself support video formats switch to the target video standard, i.e. if it is determined that target video
Standard is pal mode, and the video formats that itself is supported are switched to pal mode by electronic equipment；If it is determined that target video system
Formula is TSC-system formula, and the video formats that itself is supported are switched to TSC-system formula by electronic equipment.Due to regarding that electronic equipment switches
Frequency standard is the frequency according to power supply and the frequency and the corresponding relation of video formats that pre-save, and the target determined is regarded
Frequency standard, therefore the video formats of electronic equipment switching are video formats corresponding with the frequency of power supply, therefore can be
Under the video formats of electronic equipment switching, normal play video.
Due in embodiments of the present invention, according to the magnitude of voltage of the power supply in predetermined time period, it may be determined that supply
The frequency of power supply, and then frequency according to power supply and the frequency and the corresponding relation of video formats that pre-save can be true
Set the goal video formats, and the video formats that itself is supported switch to the target video standard, so as to avoid due to user
Select the problem of video formats mistake is caused to influence video playing quality.
Embodiment 2：
The video formats that electronic equipment itself is supported are corresponding with the frequency of power supply, and electronic equipment itself is supported in addition
Frequency of the video frame rate also with power supply it is corresponding, electronic equipment is when playing video, if electronic equipment switching is regarded
The frequency of frequency frame per second and power supply not to it is corresponding when can then produce color rolling phenomenon, influence video playing quality.Therefore electronic equipment
Before video is played, the video formats for not only needing electronic equipment to switch are corresponding with the frequency of power supply, in addition it is also necessary to electronics
The video frame rate of equipment switching is corresponding with the frequency of power supply.
On the basis of above-described embodiment, in embodiments of the present invention, the frequency according to power supply and in advance guarantor
The frequency and the corresponding relation of video formats deposited, are determined after target video standard, methods described also includes：
According to the target video standard of the determination and the video formats and the corresponding relation of video frame rate that pre-save, really
Set the goal video frame rate；
According to the target video frame per second of the determination, the video frame rate that itself is supported switches to the target video frame
Rate.
Because there is corresponding relation in the frequency all with power supply of video formats and video frame rate of electronic equipment.Electronics is set
The corresponding relation of video formats and video frame rate is pre-saved in standby, it is determined that after target video standard, according to it is described really
Fixed target video standard and the video formats and the corresponding relation of video frame rate pre-saved, it may be determined that target video frame
Rate.
Electronic equipment supports different video frame rates simultaneously, it is determined that after target video frame per second, electronic equipment can be by certainly
The video frame rate that body is supported switches to the target video frame per second.Because the video frame rate that electronic equipment switches is according to described true
Fixed target video standard and the video formats and the corresponding relation of video frame rate pre-saved, the target video frame determined
Rate, therefore the video frame rate of electronic equipment switching is video frame rate corresponding with target video standard, therefore can be set in electronics
Under the video frame rate of standby switching, normal play video rolls phenomenon without color.
For example, video formats are pal mode, the video frame rate that electronic equipment itself is supported is 25FPS, 50FPS, 100FPS
Deng；Video formats are TSC-system formula, and the video frame rate that electronic equipment itself is supported is 30FPS, 60FPS, 120FPS etc..If really
Fixed target video standard is pal mode, it is determined that target video frame per second be any in 25FPS, 50FPS, 100FPS etc.
One；If it is determined that target video standard be TSC-system formula, it is determined that target video frame per second for 30FPS, 60FPS,
Any one in 120FPS etc..It is determined that after target video frame per second, the video frame rate that itself is supported switches to the target
Video frame rate.
Due in embodiments of the present invention, according to the target video standard of the determination and the video formats pre-saved with
The corresponding relation of video frame rate, determines target video frame per second, according to the target video frame per second of the determination, by regarding that itself is supported
Frequency frame per second switches to the target video frame per second, so that the video frame rate of electronic equipment switching is and target video standard pair
The video frame rate answered, therefore, it is possible to avoid the occurrence of color rolling phenomenon.
The configuring condition of the own hardware of electronic equipment determines the maximum video frame rate that electronic equipment itself is supported, such as
The maximum video frame rate that some electronic equipments itself are supported is 80FPS, the maximum video frame rate that some electronic equipments itself are supported
, can be by any one corresponding frame of video of the target video standard it is determined that after target video standard for 120FPS etc.
Rate is defined as the target video frame per second that electronic equipment itself can be supported.In order that video playback is more smooth, of the invention real
Apply in example, the target video standard according to the determination and video formats pre-saved are corresponding with video frame rate closes
System, determines that target video frame per second includes：
According to the target video standard of the determination and the video formats and the corresponding relation of video frame rate that pre-save, really
The corresponding each video frame rate of the fixed target video standard；
According to each video frame rate of determination and the maximum video frame rate itself preserved recognized, target video frame is determined
Rate.
The multiple video frame rates of each video formats correspondence, it is determined that after target video standard, according to the target of the determination
Video formats and the video formats and the corresponding relation of video frame rate pre-saved, it may be determined that the target video standard is corresponding
Each video frame rate.The maximum video frame rate that itself can be supported is preserved in electronic equipment, it is determined that target video standard pair
After each video frame rate answered, the maximum video frame rate that can be supported according to itself recognized corresponding is each regarded described
Target video frame per second is determined in frequency frame per second, will electronic equipment can be supported in corresponding each video frame rate maximum
Video frame rate is defined as target video frame per second.It is determined that after target video frame per second, according to the target video frame per second of the determination, inciting somebody to action
The video frame rate itself supported switches to the target video frame per second.
It is determined that after the corresponding each video frame rate of target video standard, can be propped up according to itself preserved in electronic equipment
The maximum video frame rate held, it may be determined that go out electronic equipment energy described in the corresponding each video frame rate of the target video standard
The each video frame rate enough supported, wherein, by the corresponding each video frame rate of the target video standard, no more than electronics is set
The video frame rate of the maximum video frame rate that itself can be supported of standby middle preservation as the electronic equipment can support it is each
Video frame rate.And then maximum video frame rate is defined as target and regarded in each video frame rate that can support the electronic equipment
Frequency frame per second.
The corresponding video frame rate of pal mode is 25FPS, 50FPS, 100FPS etc.；The corresponding video frame rate of TSC-system formula is
30FPS, 60FPS, 120FPS etc..For example, the maximum video frame rate that electronic equipment itself is preserved is 80FPS, i.e., described electronics is set
It is standby when playing video, it would be preferable to support maximum video frame rate be 80FPS, according to the frequency of power supply and the frequency pre-saved
With the corresponding relation of video formats, it is determined that target video standard be pal mode, it is determined that the target video standard is corresponding every
Individual video frame rate is 25FPS, 50FPS, 100FPS etc., because the maximum video frame rate that electronic equipment itself is preserved is 80FPS, because
This, in corresponding each video frame rate, each video frame rate that electronic equipment can be supported be 25FPS, 50FPS, due to
Maximum video frame rate is 50FPS in each video frame rate that electronic equipment can be supported, therefore is that 50FPS is true by video frame rate
It is set to target video frame per second；If it is determined that target video standard be TSC-system formula, it is determined that the target video standard is corresponding
Each video frame rate is 30FPS, 60FPS, 120FPS etc., because the maximum video frame rate that electronic equipment itself is preserved is 80FPS,
Therefore, in corresponding each video frame rate, each video frame rate that electronic equipment can be supported be 30FPS, 60FPS, by
Maximum video frame rate is 60FPS in each video frame rate that electronic equipment can be supported, therefore is 60FPS by video frame rate
It is defined as target video frame per second.
For another example the maximum video frame rate that electronic equipment itself is preserved is 120FPS, i.e., described electronic equipment plays video
When, it would be preferable to support maximum video frame rate be 120FPS, according to the frequency of power supply and the frequency pre-saved and video system
The corresponding relation of formula, it is determined that target video standard be pal mode, it is determined that the corresponding each frame of video of the target video standard
Rate is 25FPS, 50FPS, 100FPS etc., therefore, described because the maximum video frame rate that electronic equipment itself is preserved is 120FPS
In corresponding each video frame rate, each video frame rate that electronic equipment can be supported be 25FPS, 50FPS, 100FPS, due to
Maximum video frame rate is 100FPS in each video frame rate that electronic equipment can be supported, therefore is 100FPS by video frame rate
It is defined as target video frame per second；If it is determined that target video standard be TSC-system formula, it is determined that the target video standard correspondence
Each video frame rate for 30FPS, 60FPS, 120FPS etc., because the maximum video frame rate that electronic equipment itself is preserved is
120FPS, therefore, in corresponding each video frame rate, each video frame rate that electronic equipment can be supported be 30FPS,
Maximum video frame rate is 120FPS in 60FPS, 120FPS, each video frame rate that can be supported due to electronic equipment, therefore
It is that 120FPS is defined as target video frame per second by video frame rate.
Due in embodiments of the present invention, according to the target video standard of the determination and the video formats pre-saved with
The corresponding relation of video frame rate, determines the corresponding each video frame rate of the target video standard, according to each frame of video of determination
Rate and the maximum video frame rate itself preserved recognized, electronic equipment in each video frame rate of the determination can be supported
Maximum video frame rate be defined as target video frame per second.Therefore, it is possible to the performance of maximum performance electronic equipment so that video is broadcast
Put more smooth.
Embodiment 3：
Electronic equipment is after target video standard is determined, the video formats that automatically can be supported itself switch to described
Target video standard, in order to improve Consumer's Experience, on the basis of the various embodiments described above, in embodiments of the present invention, described
According to the target video standard of the determination, the video formats that itself is supported switch to the target video standard to include：
Whether output selects the prompt message of the target video standard；
If user selects the target video standard, the video formats that itself is supported switch to the target video system
Formula.
Electronic equipment in the frequency according to power supply and the frequency and the corresponding relation of video formats that pre-save, it is determined that
After target video standard, the prompt message for whether selecting the target video standard can be exported, the prompt message can be with
For voice messaging or text information etc..The prompt message that user exports according to electronic equipment selects video formats.Because electronics is set
The prompt message of standby output specifies the target video standard of electronic equipment determination, therefore user typically can selection target video
Standard.If user's selection for target video standard, the video formats that itself is supported are switched to the mesh by electronic equipment
Mark video formats.Certainly, user is also possible to the situation for occurring falsely dropping, if the video formats of user's selection are not the targets
Video formats, electronic equipment can export the prompt message of selection video formats mistake, to point out target video selected by user
Standard.
Preferably, electronic equipment can be shielded and removed when whether output selects the prompt message of the target video standard
Video formats outside target video standard, make user can only selection target video formats, and the target video system of removing can not be selected
Video formats outside formula, had so both been not in the situation that user falsely drops video formats, could be used that family understands Current electronic
Which kind of video formats equipment switching is.
For example, electronic equipment is according to the frequency of power supply and the frequency and the corresponding relation of video formats that pre-save,
The target video standard of determination is pal mode, then exports voice messaging or text information of " whether selecting pal mode " etc., together
When TSC-system formula option can be shielded, make user according to prompt message select pal mode, user selection pal mode after,
The video formats that itself is supported are switched to pal mode by electronic equipment.
For another example electronic equipment is closed according to the frequency of power supply and the frequency pre-saved are corresponding with video formats
System, it is determined that target video standard be TSC-system formula, then export " whether selecting TSC-system formula " voice messaging or text information
Deng while pal mode option can be shielded, making user select TSC-system formula, user's selection NTSC according to prompt message
After standard, the video formats that itself is supported are switched to TSC-system formula by electronic equipment.
Because in embodiments of the present invention, electronic equipment is it is determined that after target video standard, whether output selects the mesh
The prompt message of video formats is marked, if user selects the target video standard, the video formats that itself is supported are switched to
The target video standard.So as to improve the experience of user.
Embodiment 4：
Electronic equipment is when upper electric, and power supply is likely to be AC power, it is also possible to dc source.It is directed to exchange
Power supply and dc source, the frequency of power supply can be determined in different ways, on the basis of the various embodiments described above,
In the embodiment of the present invention, the magnitude of voltage of the power supply according in predetermined time period, determine power supply frequency it
Before, methods described also includes：
Judge power supply for AC power or dc source；
If AC power, subsequent step is carried out；
If dc source, the DC voltage of dc source is filtered out, the ripple voltage of dc source is obtained, to the line
Wave voltage is amplified processing, using the ripple voltage after enhanced processing as the voltage of power supply, carries out subsequent step.
The magnitude of voltage of power supply of the electronic equipment according to predetermined time period, determine power supply frequency it
It is preceding, it is necessary to judge that power supply is AC power or dc source, if AC power, the magnitude of voltage of AC power is at any time
Between change waveform be generally sine wave, according to the magnitude of voltage of the AC power in predetermined time period, it may be determined that alternating current
The frequency in source.Therefore, if it is determined that power supply is AC power, then directly carry out follow-up according to the confession in predetermined time period
The magnitude of voltage of power supply, the step of determining the frequency of power supply.
And if it is determined that power supply is dc source, the voltage of dc source is not definitely constant, but have light
Microwave is dynamic, i.e. the voltage dc source of slight fluctuations ripple voltage.If it is determined that power supply is dc source, then
Need to filter out the DC voltage of dc source, obtain the ripple voltage of dc source.Wherein, the direct current of dc source is filtered out
Pressure, obtaining the ripple voltage of dc source can be realized by existing filter circuit, filtered out the DC voltage of dc source, obtained
Take the process of the ripple voltage of dc source to belong to prior art, no longer this process is repeated herein.
After the ripple voltage for obtaining dc source, due to the fluctuation range very little of ripple voltage, directly by ripple voltage
As the voltage of power supply, so that it is determined that the frequency of power supply.In order to further improve the frequency of the power supply pushed up
Accuracy, obtain dc source ripple voltage after, place is amplified to the ripple voltage by voltage amplifier circuit
Reason, using the ripple voltage after enhanced processing as the voltage of power supply, carries out subsequent step, i.e., according in predetermined time period
Enhanced processing after ripple voltage value, determine the frequency of power supply.Wherein, by voltage amplifier circuit to ripple electricity
The process that pressure carries out enhanced processing belongs to prior art, and no longer this process is repeated herein.
In embodiments of the present invention, if it is determined that power supply is AC power, then directly carry out long according to preset time
The magnitude of voltage of power supply in degree, the step of determining the frequency of power supply；If it is determined that power supply is dc source, then
The DC voltage of dc source is filtered out, the ripple voltage of dc source is obtained, processing is amplified to the ripple voltage, will be put
Then ripple voltage after big processing carries out the electricity according to the power supply in predetermined time period as the voltage of power supply
Pressure value, the step of determining the frequency of power supply.
In the various embodiments described above of the present invention, determine to be obtained according to software program during the frequency of power supply, also may be used
To be realized by way of building hardware circuit.If Fig. 2 is a kind of frequency for determining power supply provided in an embodiment of the present invention
The circuit diagram of rate, the circuit includes first resistor R1, second resistance R2, voltage-stabiliser tube D, the first optocoupler U1,3rd resistor R3
With the 4th resistance R4, wherein,
First resistor R1 one end connection power supply input POWER_IN, the other end respectively with second resistance R2 and surely
Pressure pipe D reference electrode connection；
One end ground connection that second resistance R2 is not connected with first resistor R1；
3rd resistor R3 one end connection first voltage input V1, the other end connects the light-emitting diodes in the first optocoupler U1
The positive pole of pipe；
Voltage-stabiliser tube D plus earth, negative electrode connects the negative pole of the light emitting diode in the first optocoupler U1；
4th resistance R4 one end connection second voltage input V2, the other end respectively with photosensitive three in the first optocoupler U1
The colelctor electrode of pole pipe and input/output port IO connections；
The grounded emitter of phototriode in first optocoupler U1.
Wherein, the voltage of first voltage input V1 and second voltage input V2 inputs is all fixed magnitude of voltage, one
As first voltage input input voltage be more than second voltage input input voltage, for example first voltage input input
Voltage be 10V, second voltage input input voltage be 3.3V.If power supply is AC power, or after processing
Dc source ripple voltage, then power supply input POWER_IN input magnitude of voltage change over time, the voltage stabilizing
Itself there is breakdown voltage value in pipe D, when the power supply input POWER_IN magnitudes of voltage inputted reach that voltage-stabiliser tube D itself is present
During breakdown voltage value, voltage-stabiliser tube D is changed into conducting from disconnecting.After voltage-stabiliser tube D conductings, first voltage input V1, the first optocoupler U1
In light emitting diode and where voltage-stabiliser tube D loop conducting, now because the light emitting diode in the first optocoupler U1 has electric current
Pass through, therefore the phototriode conducting in the first optocoupler U1, now second voltage input V2, the 4th resistance R4 and the first light
Loop conducting where phototriode in coupling U1.
Circuit as shown in Figure 2, when voltage-stabiliser tube D disconnects, the first optocoupler U1 disconnects, and now second voltage input V2 is defeated
The voltage gone out is exported to input/output port IO by the 4th resistance R4, now the magnitude of voltage and second at input/output port IO
The magnitude of voltage of voltage input end V2 outputs is identical, is high level；When voltage-stabiliser tube D is turned on, the first optocoupler U1 conductings are now inputted
Magnitude of voltage at output port IO is identical with the magnitude of voltage at the first optocoupler U1 two ends, is low level.High level is shown as in circuit
1, low level is shown as 0.Electronic equipment can be every according to the timer itself installed, and at the input/output port IO obtained
The individual moment is high level or low level, determines the frequency of power supply.
As shown in Figure 3A, if the waveform that the magnitude of voltage of power supply input POWER_IN inputs is changed over time is one
Individual sine wave, the magnitude of voltage fluctuation range of power supply is -3V to+3V, and by the voltage-stabiliser tube D in Fig. 2, the sine wave is entered
Row halfwave rectifier, obtains the waveform as described in Fig. 3 B.For example voltage-stabiliser tube D breakdown voltage value is 1.24V, then when power supply
When magnitude of voltage reaches 1.24V, voltage-stabiliser tube D conductings are now changed into low level, electronic equipment at input/output port IO from high level
It can obtain at input/output port IO and low level is changed into from high level, i.e., be changed into 0 from 1.The input and output that electronic equipment is obtained
As shown in Figure 3 C, the level change waveform according to Fig. 3 C is that can determine that power supply to level change waveform at the IO of port
Frequency, i.e., the corresponding frequency of level change waveform shown in Fig. 3 C is 2 times of the frequency of power supply, if electronic equipment is obtained
Interior input/output port IO per second at from 1 be changed into 0 number of times be 100 times, then the frequency of power supply be 50Hz.
In addition, it is determined that power supply frequency when, be also based on other circuits to realize, in the various embodiments described above
On the basis of, Fig. 4 is the circuit diagram of another frequency for determining power supply provided in an embodiment of the present invention, and the circuit includes
5th resistance R5, the 6th resistance R6 and the second optocoupler U2, wherein,
5th resistance R5 one end connection power supply input POWER_IN, the other end connects the hair in the second optocoupler U2
The positive pole of optical diode；
6th resistance R6 one end connection tertiary voltage input V3, the other end respectively with photosensitive three in the second optocoupler U2
The colelctor electrode of pole pipe and analog-digital converter ADC connections；
The negative pole ground connection of light emitting diode in second optocoupler U2；
The grounded emitter of phototriode in second optocoupler U2.
As shown in figure 4, the voltage of tertiary voltage input V3 inputs is fixed magnitude of voltage, for example can be 3.3V.Institute
State the second optocoupler U2 and be constantly in conducting state, determined by the second optocoupler U2 property, as power supply input POWER_IN
When the magnitude of voltage of input is larger, the electric current for flowing through light emitting diode in the second optocoupler U2 is larger, now the second optocoupler U2 resistance
Anti- smaller, input analog-to-digital converter ADC magnitude of voltage is smaller；And when power supply input POWER_IN input magnitude of voltage compared with
Hour, the electric current for flowing through light emitting diode in the second optocoupler U2 is smaller, and now the second optocoupler U2 impedance is larger, inputs modulus
Converter ADC magnitude of voltage is larger.Because the tertiary voltage input V3 voltages inputted are fixed magnitude of voltage, power supply is defeated
The magnitude of voltage for entering to hold POWER_IN to input is changed over time, therefore passes through circuit diagram as shown in Figure 4, inputs analog-to-digital conversion
Device ADC magnitude of voltage can change with the change of the power supply input POWER_IN magnitudes of voltage inputted.
Analog-digital converter ADC can be converted to the analog signal of input data signal, and electronic equipment can be according to modulus
The data signal of converter ADC conversions, determines the frequency of power supply.Specifically, being preset with analog-digital converter ADC with reference to electricity
Pressure value, when input analog-to-digital converter ADC magnitude of voltage is more than the default reference voltage level, analog-digital converter ADC conversions
Data signal be 1, when input analog-to-digital converter ADC magnitude of voltage is not more than the default reference voltage level, modulus turn
The data signal that parallel operation ADC is changed is 0.The data signal for the analog-digital converter ADC per second conversions that electronic equipment is obtained is changed into from 1
0 number of times is the frequency of power supply.Wherein, the data signal changed according to analog-digital converter ADC, determines power supply
The process of frequency belongs to prior art, and no longer this process is repeated herein.
In addition, the magnitude of voltage according to the power supply in predetermined time period can be realized, the frequency of power supply is determined
Circuit be not limited to circuit shown in Fig. 2 and Fig. 4, as long as can be according to the voltage of the power supply in predetermined time period
Value, determines that the circuit of the frequency of power supply is belonged in the protection domain of the embodiment of the present invention.
Fig. 5 is a kind of video formats switching device structural representation provided in an embodiment of the present invention, and described device includes：
First determining module 51, for the magnitude of voltage according to the power supply in predetermined time period, determines power supply
Frequency；
Second determining module 52, it is corresponding with video formats for the frequency according to power supply and the frequency pre-saved
Relation, determines target video standard；
First handover module 53, for the target video standard according to the determination, the video formats that itself is supported are cut
It is changed to the target video standard.
Described device also includes：
Second handover module 54, for the target video standard according to the determination and the video formats pre-saved with regarding
The corresponding relation of frequency frame per second, determines target video frame per second；According to the target video frame per second of the determination, the video that itself is supported
Frame per second switches to the target video frame per second.
Second handover module 54, specifically for the target video standard according to the determination and the video pre-saved
The corresponding relation of standard and video frame rate, determines the corresponding each video frame rate of the target video standard；According to each of determination
Video frame rate and the maximum video frame rate itself preserved recognized, determine target video frame per second.
Whether first handover module 53, the prompt message of the target video standard is selected specifically for output；Such as
Fruit user selects the target video standard, and the video formats that itself is supported switch to the target video standard.
Described device also includes：
Judge module 55, for judging power supply for AC power or dc source, if AC power, triggering
First determining module 51；If dc source, the DC voltage of dc source is filtered out, the ripple voltage of dc source is obtained,
Processing is amplified to the ripple voltage, the ripple voltage after enhanced processing is regard as the voltage of power supply, triggering first
Determining module 51.
First determining module 51 includes first resistor, second resistance, voltage-stabiliser tube, the first optocoupler, 3rd resistor and the
Four resistance, wherein, one end of first resistor connection power supply input, the other end respectively with second resistance and the ginseng of voltage-stabiliser tube
Examine electrode connection；One end ground connection that second resistance is not connected with first resistor；One end connection first voltage input of 3rd resistor
End, the other end connects the positive pole of the light emitting diode in the first optocoupler；The plus earth of voltage-stabiliser tube, negative electrode is connected in the first optocoupler
Light emitting diode negative pole；4th resistance one end connection second voltage input, the other end respectively with the first optocoupler
Colelctor electrode and the input/output port connection of phototriode；The grounded emitter of phototriode in first optocoupler.
First determining module 51 includes the 5th resistance, the 6th resistance and the second optocoupler, wherein, one end of the 5th resistance
Power supply input is connected, the other end connects the positive pole of the light emitting diode in the second optocoupler；One end connection of 6th resistance
Tertiary voltage input, the other end is connected with the colelctor electrode and analog-digital converter of the phototriode in the second optocoupler respectively；The
The negative pole ground connection of light emitting diode in two optocouplers；The grounded emitter of phototriode in second optocoupler.
The embodiments of the invention provide a kind of video formats switching method and device, methods described includes：According to it is default when
Between power supply in length magnitude of voltage, determine the frequency of power supply；According to the frequency of power supply and pre-save
The corresponding relation of frequency and video formats, determines target video standard；According to the target video standard of the determination, itself is propped up
The video formats held switch to the target video standard.Due in embodiments of the present invention, according in predetermined time period
The magnitude of voltage of power supply, it may be determined that the frequency of power supply, and then frequency and the frequency pre-saved according to power supply
The corresponding relation of rate and video formats can determine target video standard, and the video formats that itself is supported switch to the target
Video formats, so that the problem of avoiding due to influenceing video playing quality caused by user's selection video formats mistake.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (12)
1. a kind of video formats switching method, it is characterised in that methods described includes：
According to the magnitude of voltage of the power supply in predetermined time period, the frequency of power supply is determined；
According to the frequency of power supply and the frequency and the corresponding relation of video formats that pre-save, target video standard is determined；
According to the target video standard of the determination, the video formats that itself is supported switch to the target video standard.
2. the method as described in claim 1, it is characterised in that the frequency according to power supply and the frequency pre-saved
With the corresponding relation of video formats, determine after target video standard, methods described also includes：
According to the target video standard of the determination and the video formats and the corresponding relation of video frame rate that pre-save, mesh is determined
Mark video frame rate；
According to the target video frame per second of the determination, the video frame rate that itself is supported switches to the target video frame per second.
3. method as claimed in claim 2, it is characterised in that the target video standard according to the determination and in advance guarantor
The video formats and the corresponding relation of video frame rate deposited, determine that target video frame per second includes：
According to the target video standard of the determination and the video formats and the corresponding relation of video frame rate that pre-save, it is determined that should
The corresponding each video frame rate of target video standard；
According to each video frame rate of determination and the maximum video frame rate itself preserved recognized, target video frame per second is determined.
4. the method as described in claim 1, it is characterised in that the target video standard according to the determination, by itself
The video formats of support switch to the target video standard to include：
Whether output selects the prompt message of the target video standard；
If user selects the target video standard, the video formats that itself is supported switch to the target video standard.
5. the method as described in claim 1, it is characterised in that the voltage of the power supply according in predetermined time period
Before value, the frequency for determining power supply, methods described also includes：
Judge power supply for AC power or dc source；
If AC power, subsequent step is carried out；
If dc source, the DC voltage of dc source is filtered out, the ripple voltage of dc source is obtained, to ripple electricity
Pressure carries out enhanced processing, using the ripple voltage after enhanced processing as the voltage of power supply, carries out subsequent step.
6. a kind of video formats switching device, it is characterised in that described device includes：
First determining module, for the magnitude of voltage according to the power supply in predetermined time period, determines the frequency of power supply；
Second determining module, for the frequency according to power supply and the frequency and the corresponding relation of video formats that pre-save,
Determine target video standard；
First handover module, for the target video standard according to the determination, the video formats that itself is supported switch to institute
State target video standard.
7. device as claimed in claim 6, it is characterised in that described device also includes：
Second handover module, for the target video standard according to the determination and the video formats and video frame rate that pre-save
Corresponding relation, determine target video frame per second；According to the target video frame per second of the determination, the video frame rate that itself is supported is cut
It is changed to the target video frame per second.
8. device as claimed in claim 7, it is characterised in that second handover module, specifically for being determined according to described
Target video standard and the video formats and the corresponding relation of video frame rate that pre-save, determine target video standard correspondence
Each video frame rate；According to each video frame rate of determination and the maximum video frame rate itself preserved recognized, mesh is determined
Mark video frame rate.
9. whether device as claimed in claim 6, it is characterised in that first handover module, select specifically for output
The prompt message of the target video standard；If user selects the target video standard, the video formats that itself is supported
Switch to the target video standard.
10. device as claimed in claim 6, it is characterised in that described device also includes：
Judge module, for judging power supply for AC power or dc source, if AC power, triggering first is true
Cover half block；If dc source, the DC voltage of dc source is filtered out, the ripple voltage of dc source is obtained, to the line
Wave voltage is amplified processing, using the ripple voltage after enhanced processing as the voltage of power supply, triggers the first determining module.
11. device as claimed in claim 6, it is characterised in that first determining module includes first resistor, the second electricity
Resistance, voltage-stabiliser tube, the first optocoupler, 3rd resistor and the 4th resistance, wherein,
One end connection power supply input of first resistor, the other end connects with the reference electrode of second resistance and voltage-stabiliser tube respectively
Connect；
One end ground connection that second resistance is not connected with first resistor；
One end connection first voltage input of 3rd resistor, the other end connects the positive pole of the light emitting diode in the first optocoupler；
The plus earth of voltage-stabiliser tube, negative electrode connects the negative pole of the light emitting diode in the first optocoupler；
One end connection second voltage input of 4th resistance, the current collection of the other end respectively with the phototriode in the first optocoupler
Pole and input/output port connection；
The grounded emitter of phototriode in first optocoupler.
12. device as claimed in claim 6, it is characterised in that first determining module includes the 5th resistance, the 6th resistance
With the second optocoupler, wherein,
One end connection power supply input of 5th resistance, the other end connects the positive pole of the light emitting diode in the second optocoupler；
One end connection tertiary voltage input of 6th resistance, the current collection of the other end respectively with the phototriode in the second optocoupler
Pole and analog-digital converter connection；
The negative pole ground connection of light emitting diode in second optocoupler；
The grounded emitter of phototriode in second optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710473956.7A CN107222704B (en) | 2017-06-21 | 2017-06-21 | A kind of video formats switching method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710473956.7A CN107222704B (en) | 2017-06-21 | 2017-06-21 | A kind of video formats switching method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107222704A true CN107222704A (en) | 2017-09-29 |
| CN107222704B CN107222704B (en) | 2019-09-17 |
Family
ID=59949853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710473956.7A Active CN107222704B (en) | 2017-06-21 | 2017-06-21 | A kind of video formats switching method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107222704B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108093193A (en) * | 2017-12-28 | 2018-05-29 | 浙江大华技术股份有限公司 | A kind of video formats switching method and device |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2139761Y (en) * | 1992-09-22 | 1993-08-04 | 袁正兴 | Double-system satellite T.V. receiver |
| CN2240816Y (en) * | 1994-12-22 | 1996-11-20 | 上海无线电六厂 | System and frequency converting device for colour television set |
| JPH11136588A (en) * | 1997-10-30 | 1999-05-21 | Matsushita Electric Ind Co Ltd | Television broadcasting terminal device and transmitting device |
| JP2000316140A (en) * | 1999-04-30 | 2000-11-14 | Matsushita Electric Ind Co Ltd | Video format converting circuit |
| CN1288329A (en) * | 2000-07-05 | 2001-03-21 | 厦门华侨电子企业有限公司 | Image signal pattern conversion and device therefor |
| EP1089563A1 (en) * | 1999-10-01 | 2001-04-04 | Matsushita Electric Industrial Co., Ltd. | Motion compensation apparatus for digital video format down-conversion |
| CN1698372A (en) * | 2003-05-12 | 2005-11-16 | 索尼株式会社 | Image data conversion method, conversion circuit, and digital camera |
| CN1781137A (en) * | 2003-03-26 | 2006-05-31 | 夏普株式会社 | Liquid crystal television receiver, liquid crystal display control method, program thereof, and recording medium |
| CN205510281U (en) * | 2016-03-08 | 2016-08-24 | 湖北久之洋红外系统股份有限公司 | Difference digital video changes video video converting circuit of PAL -system formula |
-
2017
- 2017-06-21 CN CN201710473956.7A patent/CN107222704B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2139761Y (en) * | 1992-09-22 | 1993-08-04 | 袁正兴 | Double-system satellite T.V. receiver |
| CN2240816Y (en) * | 1994-12-22 | 1996-11-20 | 上海无线电六厂 | System and frequency converting device for colour television set |
| JPH11136588A (en) * | 1997-10-30 | 1999-05-21 | Matsushita Electric Ind Co Ltd | Television broadcasting terminal device and transmitting device |
| JP2000316140A (en) * | 1999-04-30 | 2000-11-14 | Matsushita Electric Ind Co Ltd | Video format converting circuit |
| EP1089563A1 (en) * | 1999-10-01 | 2001-04-04 | Matsushita Electric Industrial Co., Ltd. | Motion compensation apparatus for digital video format down-conversion |
| CN1288329A (en) * | 2000-07-05 | 2001-03-21 | 厦门华侨电子企业有限公司 | Image signal pattern conversion and device therefor |
| CN1781137A (en) * | 2003-03-26 | 2006-05-31 | 夏普株式会社 | Liquid crystal television receiver, liquid crystal display control method, program thereof, and recording medium |
| CN1698372A (en) * | 2003-05-12 | 2005-11-16 | 索尼株式会社 | Image data conversion method, conversion circuit, and digital camera |
| CN205510281U (en) * | 2016-03-08 | 2016-08-24 | 湖北久之洋红外系统股份有限公司 | Difference digital video changes video video converting circuit of PAL -system formula |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108093193A (en) * | 2017-12-28 | 2018-05-29 | 浙江大华技术股份有限公司 | A kind of video formats switching method and device |
| CN108093193B (en) * | 2017-12-28 | 2020-04-03 | 浙江大华技术股份有限公司 | Video format switching method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107222704B (en) | 2019-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106941321B (en) | A kind of control circuit of synchronous rectifier | |
| CN102087336B (en) | Method and system for detecting video/audio signal circuit board | |
| CN105338446B (en) | Audio track control circuit | |
| CN102945010B (en) | Method and device for realizing automatic switching of sound source | |
| CN107818765A (en) | Display device brightness control method, device and mobile intelligent terminal and display device | |
| CN107222738A (en) | A kind of video formats determine method and device | |
| CN107222704B (en) | A kind of video formats switching method and device | |
| CN103414933A (en) | Analog video signal output device and electronic device | |
| CN101865947B (en) | AC input detection circuit and detection method of power supply of flat television | |
| CN207650680U (en) | A kind of constant voltage outputting circuit that can be used in parallel and constant pressure output system | |
| CN102931952A (en) | Synchronous signal acquisition system | |
| CN103650600B (en) | Remote Radio Unit and relevant device | |
| CN108519509A (en) | Novel intelligent electric energy meter and its collecting method | |
| CN110086143A (en) | Input voltage bleeder circuit and overvoltage protection switch | |
| CN202886443U (en) | Voltage sampling circuit | |
| CN108566090A (en) | A kind of two-way bipolarity dcdc converter of low-voltage direct | |
| CN205249374U (en) | Television signal source automatic switching control equipment | |
| CN103116068A (en) | Control circuit and control method for detecting electricity consumption of washing machine | |
| CN209642549U (en) | A kind of high-current dc power supply switching circuit | |
| CN203056565U (en) | Induction cooker surge protection circuit | |
| CN204947892U (en) | A kind of flexible transmission direct current capacitor | |
| CN202514022U (en) | Automatic circulation controller of television signals | |
| CN106028027A (en) | Method and device for detecting signal operation duration | |
| CN218041605U (en) | Signal detection circuit, device and signal switching system | |
| CN207117755U (en) | SCM Based home appliance remote control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |