CN104507002A - Device and method for realizing automatic volume adjustment based on vehicle speed pulse detection - Google Patents
Device and method for realizing automatic volume adjustment based on vehicle speed pulse detection Download PDFInfo
- Publication number
- CN104507002A CN104507002A CN201410677450.4A CN201410677450A CN104507002A CN 104507002 A CN104507002 A CN 104507002A CN 201410677450 A CN201410677450 A CN 201410677450A CN 104507002 A CN104507002 A CN 104507002A
- Authority
- CN
- China
- Prior art keywords
- voltage
- input
- linear
- conductive channel
- frequency
- 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.)
- Pending
Links
Landscapes
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to the field of automobile electronics, and discloses a device for realizing automatic volume adjustment based on vehicle speed pulse detection. The device comprises a zero-crossing comparator unit, a frequency/voltage converter unit, a constant-value voltage comparator unit and an analog switch unit. The invention further discloses a method for realizing automatic volume adjustment based on vehicle speed pulse detection. The method comprises the following steps: A, converting an input mileage pulse signal W1 into a square wave signal W2 of the same frequency, and outputting the square wave signal W2; B, converting the input square wave signal W2 into a linear direct-current voltage U1 of which the voltage value is in direct proportion to the frequency value; C, comparing the input linear direct-current voltage U1 with a constant-value voltage Uc and outputting a switch control signal; and D, executing a switch channel switching action. An automatic volume adjusting function is realized on the basis of a pure hardware circuit, and danger due to manual volume adjustment during high-speed driving is avoided.
Description
Technical field
The present invention relates to vehicle electric field, particularly relate to volume adjusting method and the device of vehicle audio.
Background technology
When the vehicle runs at a high speed, the covering impact of the internal car noises such as wind is made an uproar, engine running on vehicle audio sound also aggravates, and needs by regulating the volume of vehicle audio to reduce impact.If carry out manual adjustments volume operation in the process of running at high speed, be the danger that can add driving.Therefore, a kind of method and the device that automatically can regulate the volume of vehicle audio according to speed of a motor vehicle change is needed.As the patent documentations such as China Patent Publication No. CN102931936A, CN1565891, CN102035488A, CN 202573979U, CN2644229 propose the method and apparatus of automatic regulating volume respectively.But the method and apparatus of the automatic regulating volume of prior art is all a kind of carry out control realization based on controller software, this certainly will add the unsteadiness of system cloud gray model.
Summary of the invention
The present invention proposes a kind ofly to be realized the device that volume regulates automatically solved the problems referred to above by detecting based on vehicle speed pulse of realizing of pure hardware circuit.
The present invention adopts following technical scheme to realize:
Detect the device realizing volume and automatically regulate based on vehicle speed pulse, comprising:
One zero-crossing comparator unit, this zero-crossing comparator unit is used for the square-wave signal W2 mileage pulse signal W1 of input being converted to same frequency, and exports to frequency/voltage converter unit;
One frequency/voltage converter unit, the linear DC voltage U1 that this frequency/voltage converter unit is directly proportional to frequency size for the square-wave signal W2 of input being converted to voltage swing, and export to fixed value voltage comparator unit;
Certain value voltage comparator unit, this fixed value voltage comparator unit is used for the linear DC voltage U1 of input and certain value voltage U c to compare the switching channels switching controls end of rear output switch control signal to analog switch unit, if the linear DC voltage U1 < fixed value voltage Uc of input, export the first switch controlling signal of the first conductive channel being used for conduct either analog switch element, if the linear DC voltage U1 >=fixed value voltage Uc of input, export the second switch control signal of the second conductive channel being used for conduct either analog switch element,
And an analog switch unit, the first conductive channel of this analog switch unit is for being communicated with the manual adjustments voltage U of vehicle audio
hmto volume adjusting input, the second conductive channel of this analog switch unit is for being communicated with the linear DC voltage U1 of this frequency/voltage converter unit output to volume adjusting input.
Or, first conductive channel of this analog switch unit is replaced by with the connected mode of the second conductive channel: the first conductive channel of this analog switch unit is for being communicated with the linear DC voltage U1 of this frequency/voltage converter unit output to volume adjusting input, and the second conductive channel of this analog switch unit is for being communicated with the manual adjustments voltage U of vehicle audio
hmto volume adjusting input.
Detect the method realizing volume and automatically regulate based on vehicle speed pulse, it is characterized in that, comprise step:
A, convert the mileage pulse signal W1 of input the square-wave signal W2 of same frequency to after the step that exports;
B, the square-wave signal W2 of input converted to linear DC voltage U1 that voltage swing is directly proportional to frequency size after the step that exports;
C, the linear DC voltage U1 of input and certain value voltage U c is compared the step of rear output switch control signal; Specifically: if the linear DC voltage U1 < fixed value voltage Uc of input, export the first switch controlling signal being used for conducting first conductive channel, if the linear DC voltage U1 >=fixed value voltage Uc of input, export the second switch control signal being used for conducting second conductive channel;
The step of D, execution switching channels switching action, specifically: conducting first conductive channel according to the first switch controlling signal, thus is communicated with the manual adjustments voltage U of vehicle audio
hmto volume adjusting input, or according to second switch control signal conducting second conductive channel, thus the linear DC voltage U1 be communicated with in step B is to volume adjusting input.
Or, described step D is replaced by: the step of D ', execution switching channels switching action, specifically: conducting first conductive channel according to the first switch controlling signal, thus the linear DC voltage U1 be communicated with in step B is to volume adjusting input, or conducting second conductive channel according to second switch control signal, thus the manual adjustments voltage U being communicated with vehicle audio
hmto volume adjusting input.
The present invention adopts as above technical scheme, and 1, avoid the danger that in scorch, manual adjustments volume is brought; 2, realize automatically adjusting volume functions based on the speed of a motor vehicle with pure hardware circuit, save software resource occupancy, improve system run all right; 3, realizing circuit design of the present invention is effectively succinct, reduces development cost.
Accompanying drawing explanation
Fig. 1 is electrical connection block diagram of the present invention;
Fig. 2 is the circuit theory diagrams of zero-crossing comparator unit;
Fig. 3 is the circuit theory diagrams of frequency/voltage converter unit;
Fig. 4 is the circuit theory diagrams of fixed value voltage comparator unit and analog switch unit.
Embodiment
Now the present invention is further described with embodiment by reference to the accompanying drawings.
Nowadays, automobile travel recorder is day by day popularized, and nearly all possesses the function that mileage Puled input detects and vehicle audio controls; Based on this, the present invention proposes one can when vehicle operating, calculate vehicle speed pulse frequency, by frequency width modular converter, be the linear change of direct voltage by the change transitions of frequency, when the speed of a motor vehicle exceedes reference value, the direct voltage exported by frequency width modular converter carries out the automatic regulating equipment of volume adjusting automatically.Automatic regulating equipment of the present invention is designed by pure hardware detection regulating circuit, saves software processor resource, reduces system cloud gray model load, improves system run all right.
Be described in detail below in conjunction with one embodiment of the invention.We first set vehicle mileage pulses range: 0 ~ 150HZ, assuming that need to carry out the self-adjusting specified speed of a motor vehicle 80Km/h (setting threshold) of volume, when the speed of a motor vehicle is greater than 80Km/h, the direct voltage that vehicle audio volume is exported by the conversion of frequency width carries out linear regulation (increase); When the speed of a motor vehicle is less than 80Km/h, vehicle audio volume is controlled by onboard system self, by driver's manual adjustments.Above-mentioned concrete numerical value and the setting of scope thereof are only and this embodiment of the present invention are described and set, and can adjust as the case may be, not as limit in practical application.
Consult shown in Fig. 1 and Fig. 2-4, the present invention proposes a kind of detection based on vehicle speed pulse and realizes the device that volume regulates automatically, comprising: zero-crossing comparator unit 10, frequency/voltage converter unit 20, certain value voltage comparator unit 30 and an analog switch unit 40.
Wherein, this zero-crossing comparator unit 10 for the mileage pulse signal W1 of input (may be sinusoidal wave or triangular wave waveform according to vehicle difference) being converted to the square-wave signal W2 of same frequency, and exports to frequency/voltage converter unit 20.The speed of a motor vehicle sends the processor of onboard system to the form of pulse signal in the motor vehicle; Generally there is following relation in the speed of a motor vehicle and vehicle speed pulse (also referred to as " mileage pulse signal "): the speed of a motor vehicle=(umber of pulse × 3600)/vehicle characteristics coefficient; Passenger car vehicle characteristics coefficient range is generally: 2300 ~ 2600; In these supposition vehicle characteristics coefficient=2400; From above formula, if when the setting threshold speed of a motor vehicle is 80Km/h, the pulse frequency Fin=53HZ of the mileage pulse signal W1 of corresponding input.
Again consult shown in Fig. 2 simultaneously, it is a kind of common zero-crossing comparator circuit, peripheral circuit is coordinated to form a zero-crossing comparator by amplifier N1,1 ~ 1000HZ sine wave/sawtooth waveforms (mileage pulse signal W1) of input is shaped as square wave (square-wave signal W2) after comparator, it is reverse that rear end adds one-level triode T1, by square wave amplitude clamper at Transistor-Transistor Logic level.Sine wave/the triangular wave (mileage pulse signal W1) of front end incoming frequency scope 1 ~ 150HZ, after resistance R1, R2 dividing potential drop, amplitude reduces, frequency is constant, electric capacity C1 is used for filtering high frequency spurs, electric capacity C2, resistance R3 form RC circuit, wherein resistance R3 is enough large, and the discharge and recharge time, τ=1/RC was enough little, thus ensures enough fast as the amplifier N1 reversal rate of comparator; Through the Waveform Input that as above the processes inverting input to amplifier N1; Amplifier N1 open loop, and in-phase input end ground connection, form zero-crossing comparator: when input waveform amplitude voltage is greater than zero, amplifier N1 exports high level; When input waveform amplitude voltage is less than zero, amplifier N1 output low level; So far, amplifier N1 exports the waveform close to square wave, and frequency is constant; Triode T1 and resistance R6, R7 form back clamping circuit, and the waveform exported by amplifier N1 is reverse, and amplitude clamper is at Transistor-Transistor Logic level 3.3V simultaneously; Resistance R8, electric capacity C5 form RC circuit, are standard block (square-wave signal W2) by the waveform shaping close to square wave.This zero-crossing comparator circuit is comparatively common zero-crossing comparator circuit, except the above-mentioned explanation of this embodiment, other more specifically circuit structure and operation principle also can consult prior art, no longer describe in detail.
Wherein, this frequency/voltage (F/V) converter unit 20 to be directly proportional to frequency size the linear DC voltage U1 of (ratio D) for the square-wave signal W1 of input being converted to voltage swing, and the size exporting to fixed value voltage comparator unit 30, this ratio D can regulate by changing circuit peripheral component parameter.This F/V converter unit 20 can be a kind of conventional electronic circuit, and also having integrated circuit (IC) chip can apply, and as LM331 chip etc., also can pass through independent component component.
Again consult shown in Fig. 3, be its F/V change-over circuit schematic diagram simultaneously, builds primarily of comparator and trigger.When the negative pulse of the square-wave signal W1 inputted arrives, because 6. pin level is lower than 7. pin level, so S=1 (high level),
(low level).Now discharge tube T ends, so electric capacity Ct is by V
cCcharge through resistance Rt, on it, voltage Vct exponentially increases.Meanwhile, current switch S makes constant-current source I and 1. pin connect, and makes electric capacity C
lcharging, V
cLlinearly increase (because be that constant-current source is to C
lcharging).Through 1.1R
tc
ttime, V
ctincrease to 2/3V
cCtime, then R is effectively (R=1, S=0),
now, C
t, C
lelectric discharge.Follow-uply just repeat above process, finally at R
lon just obtain a direct voltage V
out, and V
outwith the frequency f of input pulse
ibe directly proportional.C
lmean charging current be i × (1.1R
tc
t) × f
in, C
laverage discharge current be V
out/ R
l, work as C
lduring discharge and recharge average current balance, obtain V
out=I × (1.1R
tc
t) × f
in× R
l, in formula, I is continuous current, and its value is determined by Vcc and Rs.To sum up, R is worked as
s, R
t, C
t, R
lone timing, V
out(linear DC voltage U1) is proportional to f
in, i.e. V
out=D × f
in.Adjustment R
s, R
t, C
t, R
lvalue, get D=0.062, the following F/V linear relationship of this embodiment can be obtained:
| Fin(Hz) | 0 | 8 | 16 | 24 | 32 | 40 | 48 | 53 | 56 | 64 | 72 |
| Vout(V) | 0 | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 3.3 | 3.5 | 4.0 | 4.5 |
This F/V converter circuit is comparatively common frequency/voltage change-over circuit, except the above-mentioned explanation of this embodiment, other more specifically circuit structure and operation principle also can consult prior art, no longer describe in detail.
Wherein, this fixed value voltage comparator unit 30 is for comparing the switching channels switching controls end of rear output switch control signal to analog switch unit 40 by the linear DC voltage U1 of input and certain value voltage U c, if the linear DC voltage U1 < fixed value voltage Uc of input, export the first switch controlling signal of the first conductive channel being used for conduct either analog switch element 40, if the linear DC voltage U1 >=fixed value voltage Uc of input, export the second switch control signal of the second conductive channel being used for conduct either analog switch element 40.
Again consult shown in Fig. 4, this fixed value voltage comparator unit 30 inputs the anti-phase drive circuit of series connection one by a resistance-type bleeder circuit to form simultaneously.Vout (i.e. the linear DC voltage U1 of frequency/voltage converter unit 20 output) divide the threshold voltage being depressed into triode T2 by resistance R8, R9, triode T2 and resistance R10, R11 form rp-drive (reverser), for selecting the different conductive channel of switching analoging switch unit 40.Certain, fixed value voltage comparator unit 30 also can adopt other modes, and as the fixed value voltage comparison circuit etc. be made up of amplifier, drive circuit can be driven in phase also can be anti-phase driving.
First conductive channel of this analog switch unit 40 is for being communicated with the manual adjustments voltage U of vehicle audio
hmto volume adjusting input U
v, the second conductive channel of this analog switch unit 40 is for being communicated with the linear DC voltage U1 (i.e. Vout) of this frequency/voltage converter unit 20 output to volume adjusting input U
v.According to the difference of fixed value voltage comparator unit 30, otherwise or, the first conductive channel of this analog switch unit 40 is for being communicated with the linear DC voltage U1 of this frequency/voltage converter unit 20 output to volume adjusting input U
v, the second conductive channel of this analog switch unit 40 is for being communicated with the manual adjustments voltage U of vehicle audio
hmto volume adjusting input U
v.
Again consult shown in Fig. 4 simultaneously, this analog switch unit 40 is that employing analog switch device G1 realizes, the first conductive channel is formed by NO end and common port COM, the second conductive channel is formed by NC end and common port COM, IN end is the switching channels switching controls end of this analog switch device G1, and V+ end is connected working power respectively with GND end.
Like this, with the speed of a motor vehicle of this embodiment threshold value=80Km/h, respective pulses frequency=53Hz; Vout=3.3V is example:
(1) as Vout >=3.3V, triode T2 conducting, IN pin voltage Vin=0V, now NC and COM holds conducting; Now, when namely the speed of a motor vehicle is greater than 80Km/h, the direct voltage Vout that vehicle audio volume is exported by the conversion of frequency width carries out linear regulation (increase);
(2) as Vout≤3.3V, triode T2 ends, IN pin voltage Vin=3.3V, and now NO and COM holds conducting; Now, when namely the speed of a motor vehicle is less than 80Km/h, vehicle audio volume is controlled by system self, by driver's manual adjustments.
To sum up, the automatic regulating equipment of this embodiment of the invention achieves:
1, when the speed of a motor vehicle exceedes normal speed, when namely pulse frequency is greater than reference frequency, now Vout is greater than reference value, the DC voltage control volume of power amplifier linear regulation (increase) exported by frequency width modular converter;
2, when the speed of a motor vehicle is lower than normal speed, when namely pulse frequency is less than reference frequency, now Vout is less than reference value, and volume is still controlled by system self, by driver's manual adjustments.
In addition, the present invention also proposes a kind of detection based on vehicle speed pulse and realizes the method that volume regulates automatically, comprises step:
A, convert the mileage pulse signal W1 of input the square-wave signal W2 of same frequency to after the step that exports;
B, the square-wave signal W2 of input converted to linear DC voltage U1 that voltage swing is directly proportional to frequency size after the step that exports;
C, the linear DC voltage U1 of input and certain value voltage U c is compared the step of rear output switch control signal; Specifically: if the linear DC voltage U1 < fixed value voltage Uc of input, export the first switch controlling signal being used for conducting first conductive channel, if the linear DC voltage U1 >=fixed value voltage Uc of input, export the second switch control signal being used for conducting second conductive channel;
The step of D, execution switching channels switching action, specifically: conducting first conductive channel according to the first switch controlling signal, thus is communicated with the manual adjustments voltage U of vehicle audio
hmto volume adjusting input, or according to second switch control signal conducting second conductive channel, thus the linear DC voltage U1 be communicated with in step B is to volume adjusting input.
Or described step D is replaced by:
The step of D ', execution switching channels switching action, specifically: conducting first conductive channel according to the first switch controlling signal, thus the linear DC voltage U1 be communicated with in step B is to volume adjusting input, or conducting second conductive channel according to second switch control signal, thus the manual adjustments voltage U being communicated with vehicle audio
hmto volume adjusting input.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; can make a variety of changes the present invention in the form and details, be protection scope of the present invention.
Claims (5)
1. detect the device realizing volume and automatically regulate based on vehicle speed pulse, it is characterized in that, comprising:
One zero-crossing comparator unit (10), this zero-crossing comparator unit (10) for the mileage pulse signal W1 of input being converted to the square-wave signal W2 of same frequency, and exports to frequency/voltage converter unit (20);
One frequency/voltage converter unit (20), the linear DC voltage U1 that this frequency/voltage converter unit (20) is directly proportional to frequency size for the square-wave signal W2 of input being converted to voltage swing, and export to fixed value voltage comparator unit (30);
Certain value voltage comparator unit (30), this fixed value voltage comparator unit (30) is for comparing the switching channels switching controls end of rear output switch control signal to analog switch unit (40) by the linear DC voltage U1 of input and certain value voltage U c, if the linear DC voltage U1 < fixed value voltage Uc of input, export the first switch controlling signal of the first conductive channel being used for conduct either analog switch element (40), if the linear DC voltage U1 >=fixed value voltage Uc of input, export the second switch control signal of the second conductive channel being used for conduct either analog switch element (40),
And an analog switch unit (40), first conductive channel of this analog switch unit (40) is for being communicated with the manual adjustments voltage U of vehicle audio
hmto volume adjusting input, second conductive channel of this analog switch unit (40) for the linear DC voltage U1 that is communicated with this frequency/voltage converter unit (20) and exports to volume adjusting input.
2. according to claim 1 detection based on vehicle speed pulse realizes the device that volume regulates automatically, it is characterized in that: first conductive channel of this analog switch unit (40) is replaced by with the connected mode of the second conductive channel: first conductive channel of this analog switch unit (40) is for the linear DC voltage U1 that is communicated with this frequency/voltage converter unit (20) and exports to volume adjusting input, and second conductive channel of this analog switch unit (40) is for being communicated with the manual adjustments voltage U of vehicle audio
hmto volume adjusting input.
3. according to claim 1 and 2 detection based on vehicle speed pulse realizes the device that volume regulates automatically, it is characterized in that: this fixed value voltage comparator unit (30) inputs the anti-phase drive circuit of series connection one by a resistance-type bleeder circuit to form.
4. detect the method realizing volume and automatically regulate based on vehicle speed pulse, it is characterized in that, comprise step:
A, convert the mileage pulse signal W1 of input the square-wave signal W2 of same frequency to after the step that exports;
B, the square-wave signal W2 of input converted to linear DC voltage U1 that voltage swing is directly proportional to frequency size after the step that exports;
C, the linear DC voltage U1 of input and certain value voltage U c is compared the step of rear output switch control signal; Specifically: if the linear DC voltage U1 < fixed value voltage Uc of input, export the first switch controlling signal being used for conducting first conductive channel, if the linear DC voltage U1 >=fixed value voltage Uc of input, export the second switch control signal being used for conducting second conductive channel;
The step of D, execution switching channels switching action, specifically: conducting first conductive channel according to the first switch controlling signal, thus is communicated with the manual adjustments voltage U of vehicle audio
hmto volume adjusting input, or according to second switch control signal conducting second conductive channel, thus the linear DC voltage U1 be communicated with in step B is to volume adjusting input.
5. according to claim 4 detection based on vehicle speed pulse realizes the method that volume regulates automatically, it is characterized in that: described step D is replaced by:
The step of D ', execution switching channels switching action, specifically: conducting first conductive channel according to the first switch controlling signal, thus the linear DC voltage U1 be communicated with in step B is to volume adjusting input, or conducting second conductive channel according to second switch control signal, thus the manual adjustments voltage U being communicated with vehicle audio
hmto volume adjusting input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410677450.4A CN104507002A (en) | 2014-11-21 | 2014-11-21 | Device and method for realizing automatic volume adjustment based on vehicle speed pulse detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410677450.4A CN104507002A (en) | 2014-11-21 | 2014-11-21 | Device and method for realizing automatic volume adjustment based on vehicle speed pulse detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104507002A true CN104507002A (en) | 2015-04-08 |
Family
ID=52948704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410677450.4A Pending CN104507002A (en) | 2014-11-21 | 2014-11-21 | Device and method for realizing automatic volume adjustment based on vehicle speed pulse detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104507002A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137114A (en) * | 2015-07-23 | 2015-12-09 | 德惠市北方汽车底盘零部件有限公司 | Vehicle speed sensor and negative voltage anti-interference communication system |
| CN105845163A (en) * | 2016-03-30 | 2016-08-10 | 苏州合欣美电子科技有限公司 | Vehicle player having vehicle speed measurement-based volume adaptive adjustment function |
| CN105857167A (en) * | 2016-03-30 | 2016-08-17 | 滨州职业学院 | Pulse width modulation (PWM) control device for automotive electric whistle |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0787587A (en) * | 1993-09-17 | 1995-03-31 | Mitsubishi Motors Corp | On-vehicle audio signal processor |
| JPH08213861A (en) * | 1995-10-12 | 1996-08-20 | Mitsubishi Electric Corp | On-vehicle sound regeneration device |
| CN1761150A (en) * | 2005-09-05 | 2006-04-19 | 宁波百力科技有限公司 | Motor vehicle acoustic capable of regulating volume automatically |
| CN201364342Y (en) * | 2009-02-27 | 2009-12-16 | 厦门雅迅网络股份有限公司 | Device for acquiring speed signals of vehicles |
| CN201368884Y (en) * | 2009-03-24 | 2009-12-23 | 长安大学 | Speed measurement device for model racer |
| CN202573979U (en) * | 2012-01-13 | 2012-12-05 | 浙江吉利汽车研究院有限公司 | Automatic adjusting device for volume of vehicle-mounted sound box |
| CN103199826A (en) * | 2013-02-28 | 2013-07-10 | 深圳市大族激光科技股份有限公司 | Switching circuit and switching method of analog signal channel |
| CN104760544A (en) * | 2014-01-07 | 2015-07-08 | 北汽福田汽车股份有限公司 | Vehicle radio volume automatic adjusting device, amusement system and vehicle |
-
2014
- 2014-11-21 CN CN201410677450.4A patent/CN104507002A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0787587A (en) * | 1993-09-17 | 1995-03-31 | Mitsubishi Motors Corp | On-vehicle audio signal processor |
| JPH08213861A (en) * | 1995-10-12 | 1996-08-20 | Mitsubishi Electric Corp | On-vehicle sound regeneration device |
| CN1761150A (en) * | 2005-09-05 | 2006-04-19 | 宁波百力科技有限公司 | Motor vehicle acoustic capable of regulating volume automatically |
| CN201364342Y (en) * | 2009-02-27 | 2009-12-16 | 厦门雅迅网络股份有限公司 | Device for acquiring speed signals of vehicles |
| CN201368884Y (en) * | 2009-03-24 | 2009-12-23 | 长安大学 | Speed measurement device for model racer |
| CN202573979U (en) * | 2012-01-13 | 2012-12-05 | 浙江吉利汽车研究院有限公司 | Automatic adjusting device for volume of vehicle-mounted sound box |
| CN103199826A (en) * | 2013-02-28 | 2013-07-10 | 深圳市大族激光科技股份有限公司 | Switching circuit and switching method of analog signal channel |
| CN104760544A (en) * | 2014-01-07 | 2015-07-08 | 北汽福田汽车股份有限公司 | Vehicle radio volume automatic adjusting device, amusement system and vehicle |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137114A (en) * | 2015-07-23 | 2015-12-09 | 德惠市北方汽车底盘零部件有限公司 | Vehicle speed sensor and negative voltage anti-interference communication system |
| CN105137114B (en) * | 2015-07-23 | 2018-05-18 | 德惠市北方汽车底盘零部件有限公司 | A kind of vehicle speed sensor and negative voltage Anti-jamming Communication system |
| CN105845163A (en) * | 2016-03-30 | 2016-08-10 | 苏州合欣美电子科技有限公司 | Vehicle player having vehicle speed measurement-based volume adaptive adjustment function |
| CN105857167A (en) * | 2016-03-30 | 2016-08-17 | 滨州职业学院 | Pulse width modulation (PWM) control device for automotive electric whistle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8890425B2 (en) | Blend dimming circuits and relevant methods | |
| CN103019285B (en) | Power supply with dynamic voltage drop control and method thereof | |
| CN103647449B (en) | A kind of boost-type charge pump circuit | |
| US8502510B2 (en) | Switching mode power supply with predicted PWM control | |
| CN103096599B (en) | Device and method of light emitting diode (LED) dimming driving | |
| JP2017221002A (en) | Motor controller | |
| CN103108437A (en) | Light-emitting diode (LED) illuminating system and method for constant-current control in various operation modes | |
| CN109742982B (en) | Power-adjustable power-limiting control method and controller | |
| CN104638913B (en) | Single-inductance double-output switch converters bicyclic voltage-type PFM control and its device | |
| US9158321B2 (en) | Linear current regulator | |
| CN103066954B (en) | Ramp signal generation circuit and ramp signal adjustment circuit | |
| JP2009118650A (en) | Power converter | |
| CN103023311B (en) | Supply unit and light-emitting component drive apparatus | |
| CN104507002A (en) | Device and method for realizing automatic volume adjustment based on vehicle speed pulse detection | |
| CN103855928A (en) | Multifunctional digital pulse width modulation controller | |
| CN105027406A (en) | Pulse density digital-to-analog converter with slope compensation function | |
| CN104242662A (en) | Method and system for controlling four-tube Buck-Boost circuit | |
| US20120274294A1 (en) | Controller for converting circuit | |
| CN107078727B (en) | Asymmetric hysteretic controller | |
| CN109428484A (en) | Power-switching circuit | |
| JP6713427B2 (en) | Load drive system and load drive method | |
| EP4001621A1 (en) | Control circuit and method for fuel conservation multi-state switch | |
| US9515639B2 (en) | Method for generating a pulse and circuit configuration for an electronic device to generate a pulse | |
| CN105915143A (en) | Driving system, apparatus and method for spindle motor | |
| CN102570805A (en) | Buck converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150408 |
|
| RJ01 | Rejection of invention patent application after publication |