CN109951176A - A kind of system and method for the acquisition capacity for detection waveform acquisition device - Google Patents
A kind of system and method for the acquisition capacity for detection waveform acquisition device Download PDFInfo
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- CN109951176A CN109951176A CN201910223647.3A CN201910223647A CN109951176A CN 109951176 A CN109951176 A CN 109951176A CN 201910223647 A CN201910223647 A CN 201910223647A CN 109951176 A CN109951176 A CN 109951176A
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Abstract
The present invention relates to electronic circuit technology fields, more particularly to a kind of system and method for the acquisition capacity for detection waveform acquisition device, including, change the duty ratio of digital input signals by digital signal generation circuit, the waveform variation for the digital output signal that observation Waveform display apparatus is shown, to acquire the waveform parameter of digital output signal by acquisition software, until acquisition software can not identify the waveform of digital output signal.Beneficial effect is: the duty ratio by changing digital output signal, observe the waveform variation of digital output signal, to acquire the waveform parameter of digital output signal, until acquisition software can not identify the waveform of digital output signal, effectively solve the case where can not determining duty ratio in the window of acquisition software, the reliability of guarantee system, and in the case where the register of acquisition software can not be changed, the surplus of acquisition software can be better understood, the stability for ensuring acquisition software does not need to increase cost.
Description
Technical field
The present invention relates to electronic circuit technology field more particularly to a kind of acquisition capacities for detection waveform acquisition device
System and method.
Background technique
SPDIF is the abbreviation of SONY, PHILIPS digital audio interface.For transmission mode, SPDIF points are output
(SPDIF OUT) and two kinds of input (SPDIF IN).Most of sound card chip can support SPDIF OUT, but I at present
It is noted that be not that each product can all provide digital interface.For transport vehicle, SPDIF be divided into again it is coaxial and
Two kinds of optical fiber, the signal that they can transmit in fact be it is identical, only carrier is different, and interface and line appearance also have difference
It is different.But optical signal transmission is trend popular from now on, and main advantage is without consideration interface level and impedance problems, interface
Flexibly and anti-interference ability is stronger.It is universal to have become PCI sound card of new generation by SPDIF interface transmission digital voice signal
The characteristics of possessing.
In the prior art, SPDIF digital input signals, digital signal pulse duty cycle has in practical application acquisition software
Offset, needs to measure the minimum and maximum value of digital signal pulse duty cycle.Currently used method is straight by oscillograph
It connects and measures SPDIF digital signal waveform, but being unable to measure out software can be with the minimum and maximum arteries and veins of identifying processing signal waveform
Wide waveform.
Summary of the invention
For the above-mentioned problems in the prior art, a kind of acquisition capacity for detection waveform acquisition device is now provided
System and method.
Specific technical solution is as follows:
A kind of system of the acquisition capacity for detection waveform acquisition device, including:
One digital signal generation circuit, the digital signal generation circuit include an adjusting unit and an acquisition unit, institute
It states and adjusts the duty ratio that unit is used to adjust digital input signals, the acquisition unit is for acquiring the digital input signals
Waveform, to export digital output signal；
One Waveform display apparatus, the input terminal of the Waveform display apparatus connect the output of the digital signal generation circuit
End, the Waveform display apparatus are used to show the waveform of the digital output signal；
One waveform acquisition equipment, the input terminal of the waveform acquisition equipment connect the output of the digital signal generation circuit
End, the waveform acquisition equipment is interior to install an acquisition software, and the acquisition software is used to acquire the wave of the digital output signal
Shape parameter；
The duty ratio for changing the digital input signals by the digital signal generation circuit is observed the waveform and is shown
The waveform for the digital output signal that device is shown changes, to acquire the digital output signal by the acquisition software
Waveform parameter, until the acquisition software can not identify the waveform of the digital output signal.
Preferably, the adjusting unit includes:
One first capacitor is connected between the digital input signals and ground terminal by a first resistor；
One second resistance, through one second capacitance connection between the first capacitor and ground terminal.
Preferably, the acquisition unit includes:
The normal phase input end of one comparator, the comparator connects the second resistance, the anti-phase input of the comparator
End connects supply voltage by a 3rd resistor, and the power end of the comparator connects the supply voltage, the comparator
Ground terminal connects ground terminal, and the output end of the comparator exports digital output signal, and the comparator is used for the number
Input signal is compared with a reference signal, to export the digital signal output signal；
One the 4th resistance, is connected between the inverting input terminal and ground terminal of the comparator；
One third capacitor, is connected between the supply voltage and ground terminal.
Preferably, the 3rd resistor and the 4th resistance form a voltage dividing resistance circuit, and the reference signal passes through
The resistor voltage divider circuit is formed, and the dot being connected between the 3rd resistor and the 4th resistance is at divider node, institute
Reference signal is stated to draw from the divider node.
Preferably, the resistor voltage divider circuit includes predetermined number and the divider resistance for being serially connected ground, the partial pressure electricity
Resistance is connected between supply voltage and ground terminal, and the dot being connected between the divider resistance is at divider node, the reference
Signal is drawn from the divider node.
Preferably, the second resistance is adjustable variable resistance；
The resistance value for adjusting adjustable variable resistance described in unit slidable adjustment, so that the digital input signals
Rising time variation, after the acquisition unit, to adjust the change in duty cycle of the digital output signal.
Preferably, the resistance value for adjusting unit sliding and adjustable variable resistance being turned up, so that the number is defeated
The rising time for entering signal increases, after the acquisition unit, to increase the duty ratio of the digital output signal.
Preferably, the resistance value for adjusting unit sliding and turning down adjustable variable resistance, so that the number is defeated
The rising time for entering signal is reduced, after the acquisition unit, to reduce the duty ratio of the digital output signal.
The invention also includes a kind of methods of acquisition capacity for detection waveform acquisition device, which is characterized in that is used for
System described in above-mentioned any one for the acquisition capacity of detection waveform acquisition device, it is described for detection waveform acquisition dress
The method of the acquisition capacity set the following steps are included:
Step S1, a digital signal generation circuit is provided, for adjusting the duty ratio of digital input signals, to export number
Output signal；
Step S2, a Waveform display apparatus is provided, for showing the waveform of the digital output signal；
Step S3, a waveform acquisition equipment is provided, the waveform acquisition equipment acquires the number by an acquisition software
The waveform parameter of output signal；
Step S4, by changing the duty ratio of digital input signals, the waveform of the digital output signal is observed, and record
The waveform parameter of the digital output signal, until the acquisition software can not identify the waveform of the digital output signal.
Preferably, in Yu Suoshu step S1, the digital signal generation circuit adjusts unit and an acquisition unit including one,
The duty ratio for adjusting unit and being used to adjust digital input signals, the acquisition unit is for acquiring the digital input signals
Waveform, to export digital output signal.
Technical solution of the present invention beneficial effect is: providing a kind of acquisition capacity for detection waveform acquisition device
System and method observes the waveform variation of digital output signal, by changing the duty ratio of digital output signal to acquire number
The waveform parameter of output signal effectively solves acquisition software until acquisition software can not identify the waveform of digital output signal
The case where duty ratio can not be determined in window, guarantee the reliability of system, and the register of acquisition software can not be more
In the case where changing, the surplus of acquisition software can be better understood, it is ensured that the stability of acquisition software does not need to increase cost.
Detailed description of the invention
With reference to appended attached drawing, more fully to describe the embodiment of the present invention.However, appended attached drawing be merely to illustrate and
It illustrates, and is not meant to limit the scope of the invention.
Fig. 1 is the functional block diagram of the system of the acquisition capacity for detection waveform acquisition device of the embodiment of the present invention；
Fig. 2 is the digital signal hair of the system of the acquisition capacity for detection waveform acquisition device of the embodiment of the present invention
The circuit diagram of raw circuit；
Fig. 3 is the acquisition software of the system of the acquisition capacity for detection waveform acquisition device of the embodiment of the present invention
Adjust waveform diagram.
Fig. 4 is the step process of the method for the acquisition capacity for detection waveform acquisition device of the embodiment of the present invention
Figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.
The present invention includes a kind of system of acquisition capacity for detection waveform acquisition device, wherein includes:
One digital signal generation circuit 1, digital signal generation circuit 1 adjust unit 10 and an acquisition unit 11 including one,
The duty ratio that unit 10 is used to adjust digital input signals SPDIF_IN is adjusted, acquisition unit 11 is for acquiring digital input signals
The waveform of SPDIF_IN, to export digital output signal SPDIF_OUT；
One Waveform display apparatus 2, the output end of the input terminal connection digital signal generation circuit 1 of Waveform display apparatus 2, wave
Shape display device 2 is used to show the waveform of digital output signal SPDIF_OUT；
One waveform acquisition equipment 3, the output end of the input terminal connection digital signal generation circuit 1 of waveform acquisition equipment 3, wave
One acquisition software (not shown in FIG.) is installed, acquisition software (not shown in FIG.) is for acquiring number in shape acquisition device 3
The waveform parameter of output signal SPDIF_OUT；
Change the duty ratio of digital input signals SPDIF_IN, observation waveform display dress by digital signal generation circuit 1
The waveform variation of the digital output signal SPDIF_OUT of 2 displays is set, to pass through acquisition software (not shown in FIG.) acquisition number
The waveform parameter of output signal SPDIF_OUT, until acquisition software (not shown in FIG.) can not identify digital output signal
The waveform of SPDIF_OUT.
By the technical solution of the system of the above-mentioned acquisition capacity for detection waveform acquisition device, in conjunction with shown in Fig. 1,3,
Digital input signals SPDIF_IN is adjusted by adjusting unit 10, to obtain the minimum pulse width wave of digital input signals SPDIF_IN
Then shape duty ratio exports digital regulating signal (not shown in FIG.), (is being schemed digital regulating signal by acquisition unit 11
In be not shown) be compared with reference signal Vref, export digital output signal SPDIF_OUT, finally by waveform show fill
Set the waveform of 2 display digital output signal SPDIF_OUT, wherein Waveform display apparatus 2 can select oscillograph, meanwhile, pass through
Digital signal generation circuit 1 changes the duty ratio of digital input signals SPDIF_IN, the number that observation Waveform display apparatus 2 is shown
The waveform of output signal SPDIF_OUT changes, to acquire digital output signal by acquisition software (not shown in FIG.)
The waveform parameter of SPDIF_OUT, until acquisition software (not shown in FIG.) can not identify digital output signal SPDIF_OUT's
Waveform.
Further, it as shown in figure 3, the collected data of acquisition software (not shown in FIG.) are as follows, at the t1 moment, surveys
Maximum pulse width is tried, at the t2 moment, tests minimum pulse width, t1=-26.4ns, maximum pulse width V1=908.4mV, t2=-163.4ps,
Minimum pulse width V2=1.6mV, is calculated, Δ V=V2-V1=-906.8mV, Δ t=t2-t1=26.2ns, Δ V/ Δ t=-
36.8mV/s, 1/ Δ t=38.11MHZ.
Further, by changing the duty ratio of digital output signal SPDIF_OUT, digital output signal SPDIF_ is observed
The waveform of OUT changes, to acquire the waveform parameter of digital output signal SPDIF_OUT, until acquisition software (does not show in figure
The waveform of digital output signal SPDIF_OUT can not be identified out), in the window for effectively solving acquisition software (not shown in FIG.)
The case where can not determining duty ratio, guarantees the reliability of system, and in the deposit of acquisition software (not shown in FIG.)
In the case that device can not be changed, the surplus of acquisition software can be better understood, it is ensured that the stability of acquisition software does not need to increase
Addition sheet.
In a kind of preferably embodiment, adjusting unit 10 includes:
One first capacitor C1, by a first resistor R1 be connected to digital input signals SPDIF_IN and ground terminal GND it
Between；
One second resistance R2 is connected between first capacitor C1 and ground terminal GND by one second capacitor C2.
Specifically, electricity is adjusted as shown in Fig. 2, adjusting and constructing RC by first capacitor C1 and second resistance R2 in unit 10
Road, RC adjust circuit adjust digital input signals SPDIF_IN when, the rising time of digital input signals SPDIF_IN with
The resistance value of second resistance R2 is directly proportional, for example, rising time is shorter, and rising edge is got over when the resistance value of second resistance R2 is smaller
Suddenly, on the contrary, when the resistance value of second resistance R2 is bigger, rising time is longer, and rising edge is slower.
Further, by changing the duty ratio of digital output signal SPDIF_OUT, digital output signal SPDIF_ is observed
The waveform of OUT changes, to acquire the waveform parameter of digital output signal SPDIF_OUT, until acquisition software (does not show in figure
The waveform of digital output signal SPDIF_OUT can not be identified out), in the window for effectively solving acquisition software (not shown in FIG.)
The case where can not determining duty ratio, guarantees the reliability of system, and in the deposit of acquisition software (not shown in FIG.)
In the case that device can not be changed, the surplus of acquisition software can be better understood, it is ensured that the stability of acquisition software does not need to increase
Addition sheet.
In a kind of preferably embodiment, acquisition unit 11 includes:
The normal phase input end IN+ connection second resistance R2 of one comparator U1, comparator U1, the inverting input terminal of comparator U1
IN- passes through the power end V+ connection supply voltage VDDIO of 3rd resistor R3 connection a supply voltage VDDIO, comparator U1, compares
The output end VOUT of ground terminal VS connection the ground terminal GND, comparator U1 of device U1 export digital output signal SPDIF_OUT, than
It is compared for digital input signal SPDIF_IN with a reference signal Vref compared with device U1, is exported and believed with output digit signals
Number SPDIF_OUT；
One the 4th resistance R4, is connected between the inverting input terminal IN- of comparator U1 and ground terminal GND；
One third capacitor C3, is connected between supply voltage VDDIO and ground terminal GND.
Specifically, as shown in Fig. 2, supply voltage VDDIO provides the band energy source voltage of 3.3V, when the resistance value of second resistance R2
More hour, rising time is shorter, and rising edge is steeper, after comparator U1, the pulsewidth of digital output signal SPDIF_OUT
Duty ratio becomes smaller, opposite, and when the resistance value of second resistance R2 is bigger, rising time is longer, and rising edge is slower, by than
After device U1, the pulse duty cycle of digital output signal SPDIF_OUT becomes larger, and further, solves nothing in acquisition software
Method determines the case where duty ratio, guarantees the reliability of system, and the case where the register of acquisition software can not be changed
Under, the surplus of acquisition software can be better understood, it is ensured that the stability of acquisition software does not need to increase cost.
In above-mentioned technical proposal, 3rd resistor R3 and the 4th resistance R4 form a voltage dividing resistance circuit, reference signal Vref
It is formed by resistor voltage divider circuit, the dot being connected between 3rd resistor R3 and the 4th resistance R4 is at divider node, with reference to letter
Number Vref is drawn from the divider node.
Ground can be expanded, resistor voltage divider circuit includes predetermined number and the divider resistance for being serially connected ground, divider resistance connection
Between supply voltage and ground terminal, the dot that is connected between divider resistance is at divider node, and reference signal is from the partial pressure
Node is drawn.
In a kind of preferably embodiment, second resistance R2 is adjustable variable resistance；
The resistance value for adjusting the adjustable variable resistance of 10 slidable adjustment of unit, so that digital input signals SPDIF_IN's is upper
It rises along time change, after acquisition unit 11, to adjust the change in duty cycle of digital output signal SPDIF_OUT.
Specifically, the resistance value that adjustable variable resistance is turned up in the sliding of unit 10 is adjusted, so that digital input signals
The rising time of SPDIF_IN increases, after acquisition unit 11, to increase the duty of digital output signal SPDIF_OUT
Than.
Ground can be expanded, unit 10 is adjusted and slides the resistance value for turning down adjustable variable resistance, so that digital input signals
The rising time of SPDIF_IN is reduced, after acquisition unit 11, to reduce the duty of digital output signal SPDIF_OUT
Than.
Further, by changing the duty ratio of digital output signal SPDIF_OUT, digital output signal SPDIF_ is observed
The waveform of OUT changes, to acquire the waveform parameter of digital output signal SPDIF_OUT, until acquisition software (does not show in figure
The waveform of digital output signal SPDIF_OUT can not be identified out), in the window for effectively solving acquisition software (not shown in FIG.)
The case where can not determining duty ratio, guarantees the reliability of system, and in the deposit of acquisition software (not shown in FIG.)
In the case that device can not be changed, the surplus of acquisition software can be better understood, it is ensured that the stability of acquisition software does not need to increase
Addition sheet.
The invention also includes a kind of methods of acquisition capacity for detection waveform acquisition device, as shown in figure 3, wherein using
In the system of the acquisition capacity for detection waveform acquisition device of above-mentioned any one, for adopting for detection waveform acquisition device
The method of collection ability the following steps are included:
Step S1, a digital signal generation circuit 1 is provided, for adjusting the duty ratio of digital input signals SPDIF_IN,
To export digital output signal SPDIF_OUT；
Step S2, a Waveform display apparatus 2 is provided, for showing the waveform of digital output signal SPDIF_OUT；
Step S3, a waveform acquisition equipment 3 is provided, waveform acquisition equipment 3 passes through an acquisition software (not shown in FIG.)
Acquire the waveform parameter of digital output signal SPDIF_OUT；
Step S4, by changing the duty ratio of digital input signals SPDIF_IN, digital output signal SPDIF_OUT is observed
Waveform, and the waveform parameter of digital output signal SPDIF_OUT is recorded, until acquisition software (being not shown in the figure) can not
Identify the waveform of digital output signal SPDIF_OUT.
In above-mentioned technical proposal, digital signal generation circuit 1 includes an adjusting unit 10 and an acquisition unit 11, is adjusted single
Member 10 is for adjusting the duty ratio of digital input signals SPDIF_IN, and acquisition unit 11 is for acquiring digital input signals SPDIF_
The waveform of IN, to export digital output signal SPDIF_OUT.
Further, by changing the duty ratio of digital output signal SPDIF_OUT, digital output signal SPDIF_ is observed
The waveform of OUT changes, to acquire the waveform parameter of digital output signal SPDIF_OUT, until acquisition software (does not show in figure
The waveform of digital output signal SPDIF_OUT can not be identified out), in the window for effectively solving acquisition software (not shown in FIG.)
The case where can not determining duty ratio, guarantees the reliability of system, and in the deposit of acquisition software (not shown in FIG.)
In the case that device can not be changed, the surplus of acquisition software can be better understood, it is ensured that the stability of acquisition software does not need to increase
Addition sheet.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection model
It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.
Claims (10)
1. a kind of system of the acquisition capacity for detection waveform acquisition device characterized by comprising
One digital signal generation circuit, the digital signal generation circuit include an adjusting unit and an acquisition unit, the tune
Section unit is used to adjust the duty ratio of digital input signals, and the acquisition unit is used to acquire the wave of the digital input signals
Shape, to export digital output signal；
One Waveform display apparatus, the input terminal of the Waveform display apparatus connect the output end of the digital signal generation circuit,
The Waveform display apparatus is used to show the waveform of the digital output signal；
One waveform acquisition equipment, the input terminal of the waveform acquisition equipment connect the output end of the digital signal generation circuit,
One acquisition software is installed, the acquisition software is used to acquire the waveform ginseng of the digital output signal in the waveform acquisition equipment
Number；
The duty ratio for changing the digital input signals by the digital signal generation circuit observes the Waveform display apparatus
The waveform variation of the digital output signal of display, to acquire the waveform of the digital output signal by the acquisition software
Parameter, until the acquisition software can not identify the waveform of the digital output signal.
2. the system of the acquisition capacity according to claim 1 for detection waveform acquisition device, which is characterized in that described
Adjusting unit includes:
One first capacitor is connected between the digital input signals and ground terminal by a first resistor；
One second resistance, through one second capacitance connection between the first capacitor and ground terminal.
3. the system of the acquisition capacity according to claim 2 for detection waveform acquisition device, which is characterized in that described
Acquisition unit includes:
One comparator, the normal phase input end of the comparator connect the second resistance, and the inverting input terminal of the comparator is logical
3rd resistor connection supply voltage is crossed, the power end of the comparator connects the supply voltage, the ground connection of the comparator
End connection ground terminal, the output end of the comparator export digital output signal, and the comparator is used for the numeral input
Signal is compared with a reference signal, to export the digital signal output signal；
One the 4th resistance, is connected between the inverting input terminal and ground terminal of the comparator；
One third capacitor, is connected between the supply voltage and ground terminal.
4. the system of the acquisition capacity according to claim 3 for detection waveform acquisition device, which is characterized in that described
3rd resistor and the 4th resistance form a voltage dividing resistance circuit, and the reference signal passes through the resistor voltage divider circuit shape
At the dot being connected between the 3rd resistor and the 4th resistance is at divider node, and the reference signal is from described point
Node is pressed to draw.
5. the system of the acquisition capacity according to claim 4 for detection waveform acquisition device, which is characterized in that described
Resistor voltage divider circuit includes predetermined number and the divider resistance for being serially connected ground, and the divider resistance is connected to supply voltage and connects
Between ground terminal, the dot being connected between the divider resistance at divider node, draw from the divider node by the reference signal
Out.
6. the system of the acquisition capacity according to claim 2 for detection waveform acquisition device, which is characterized in that described
Second resistance is adjustable variable resistance；
The resistance value for adjusting adjustable variable resistance described in unit slidable adjustment, so that the rising of the digital input signals
Along time change, after the acquisition unit, to adjust the change in duty cycle of the digital output signal.
7. the system of the acquisition capacity according to claim 6 for detection waveform acquisition device, which is characterized in that described
The resistance value that adjustable variable resistance is turned up in unit sliding is adjusted, so that the rising time of the digital input signals increases
Add, after the acquisition unit, to increase the duty ratio of the digital output signal.
8. the system of the acquisition capacity according to claim 6 for detection waveform acquisition device, which is characterized in that described
The resistance value that adjustable variable resistance is turned down in unit sliding is adjusted, so that the rising time of the digital input signals subtracts
It is few, after the acquisition unit, to reduce the duty ratio of the digital output signal.
9. a kind of method of the acquisition capacity for detection waveform acquisition device, which is characterized in that be used for the claims 1-8
System described in any one for the acquisition capacity of detection waveform acquisition device, it is described for detection waveform acquisition device
The method of acquisition capacity the following steps are included:
Step S1, a digital signal generation circuit is provided, for adjusting the duty ratio of digital input signals, to export numeral output
Signal；
Step S2, a Waveform display apparatus is provided, for showing the waveform of the digital output signal；
Step S3, a waveform acquisition equipment is provided, the waveform acquisition equipment acquires the numeral output by an acquisition software
The waveform parameter of signal；
Step S4, by changing the duty ratio of digital input signals, the waveform of the digital output signal is observed, and described in record
The waveform parameter of digital output signal, until the acquisition software can not identify the waveform of the digital output signal.
10. the method for the acquisition capacity according to claim 9 for detection waveform acquisition device, which is characterized in that in
In the step S1, the digital signal generation circuit includes that an adjusting unit and an acquisition unit, the adjusting unit are used for
The duty ratio of digital input signals is adjusted, the acquisition unit is used to acquire the waveform of the digital input signals, to export number
Word output signal.
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| CN201910223647.3A CN109951176B (en) | 2019-03-22 | 2019-03-22 | System and method for detecting acquisition capacity of waveform acquisition device |
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| CN201910223647.3A CN109951176B (en) | 2019-03-22 | 2019-03-22 | System and method for detecting acquisition capacity of waveform acquisition device |
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| US20080033695A1 (en) * | 2004-10-18 | 2008-02-07 | Nsk Ltd | Abnormality Diagnosing System For Mechanical Equipment |
| US20090153156A1 (en) * | 2005-08-29 | 2009-06-18 | Nec Corporation | Insulation resistance detecting apparatus |
| CN201315646Y (en) * | 2008-12-23 | 2009-09-23 | 深圳创维－Rgb电子有限公司 | Digital audio interface circuit for TV |
| CN105071652A (en) * | 2015-09-22 | 2015-11-18 | 广东志高暖通设备股份有限公司 | Control Boost PFC circuit |
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2019
- 2019-03-22 CN CN201910223647.3A patent/CN109951176B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080033695A1 (en) * | 2004-10-18 | 2008-02-07 | Nsk Ltd | Abnormality Diagnosing System For Mechanical Equipment |
| US20090153156A1 (en) * | 2005-08-29 | 2009-06-18 | Nec Corporation | Insulation resistance detecting apparatus |
| CN201315646Y (en) * | 2008-12-23 | 2009-09-23 | 深圳创维－Rgb电子有限公司 | Digital audio interface circuit for TV |
| CN105071652A (en) * | 2015-09-22 | 2015-11-18 | 广东志高暖通设备股份有限公司 | Control Boost PFC circuit |
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| CN109951176B (en) | 2023-03-28 |
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