CN104698393A - Power detector with automatic muting function and vehicle-borne audio-visual system - Google Patents
Power detector with automatic muting function and vehicle-borne audio-visual system Download PDFInfo
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- CN104698393A CN104698393A CN201310644634.6A CN201310644634A CN104698393A CN 104698393 A CN104698393 A CN 104698393A CN 201310644634 A CN201310644634 A CN 201310644634A CN 104698393 A CN104698393 A CN 104698393A
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Abstract
The invention discloses a power detector with an automatic muting function and a vehicle-borne audio-visual system using the power detector. The power detector detects a power signal output by a power supply of a system and the size of a preset reference level in real time by using a comparator U1, controls an audio pre-output signal output from a sound processing chip through on-off of a switching element, and prevents noise output under abnormal conditions. Compared with the prior art, the anti-interference capability of the sound processing chip to the power supply is enhanced, and a sound control effect is achieved at a terminal; and sound is automatically cut off from the source, control by software is not needed, and the setting and control of the power detector are flexible.
Description
Technical field
The present invention relates to and a kind ofly there is the Power supply detector of automatic mute and use the vehicle carried video system of described Power supply detector.
Background technology
Along with the development of science and technology, chip design art reaches Highgrade integration, and function is complicated.The epoch utilizing discrete device two triode and simple amplifier comparer realizing circuit electric function have been taken leave of in design and the research and development of Modern Industry Products gradually.But because specific area is variant for the demand of chip, the chip except custom-made can meet except the requirement of special area use, most products is all use existing chip to carry out Design and manufacture.In addition the chip price of custom-made is high, and input cost is high.How just can accomplish before certain chip does not emerge, to allow general-purpose chip meet the requirement of specific region, become design engineer normal faced by problem.
Meanwhile, utilize general-purpose chip to carry out designing the expansion realizing specific function and also bring certain difficulty, wherein maximum difficulty cannot extract correlation signal exactly from current Circuits System, utilizes correlation signal to design expansion signal.
At automotive field, the control of sound is a requisite technical indicator in its audio-video system, cannot adapt to the burst change of power supply source and self character and cause the control of sound out of control due to audio-video system.Consequence out of control is that abnormal PoP sound and noise are exported by loudspeaker, brings noise acoustically to people.Common sound reason out of control has several as follows:
1. employ conventional sound processing chip, chip cannot adapt to the requirement of audio-video system circuit design;
2. employ conventional sound processing chip, utilize software to the programming of sound processing chip and design but still the requirement of audio-video system cannot be adapted to completely;
3. there is no the operational special chip of specific area as solution.
For reason 1, this is because usually do not go the situation considering that audio-video system power supply was complicated and changeable in the process of deisgn product, such as audio-video system power supply falls without reason and causes sound chip to be operated in assigned voltage, thus sends abnormal sound; Audio-video system power supply is saltus step in any range of voltage values without reason, sends abnormal sound and leak sound etc. under causing sound chip can not be operated in a stable voltage.These problems all easily cause chip cannot normally use under audio-video system power environment.
For above-mentioned reason 2, consider owing to needing the very large human resources of input and time to go and study sound model out of control and sequential on the one hand, be optimized code and carry out special configuration to chip internal register, workload is very large.Control owing to using software to lose efficacy to sound on the other hand, demand fulfillment sound processing chip can work this major premise in normal state, if power good all cannot meet, one-side Optimization Software is nonsensical.
Therefore, what first will meet is the change that hardware circuit can detect audio-video system power supply, and directly controls voice output chip or voice output passage, and this fundamentally could prevent the output of abnormal sound, thoroughly solves the sound unhappy sense brought out of control.
Summary of the invention
For above-mentioned prior art, the technical problem to be solved in the present invention is: provide a kind of Power supply detector and the vehicle carried video system with automatic mute, real-time monitoring system power supply voltage, the output of control signal, solves sound processing chip and cannot normally work when improper power supply thus the PoP sound introduced and souffle problem.
In order to solve the problem, a kind of Power supply detector with automatic mute that the present invention proposes, comprise comparer U1, it is characterized in that, the in-phase input end of described comparer U1 accesses datum by a resistance R6 connected and inductance L 3, the inverting input of comparer U1 is by a resistance R60 connecting system power supply signal, and the output terminal of comparer U1 is connected with on-off element Q1 and on-off element Q2, for controlling the output of left and right sound track signals.
Preferably, described on-off element Q1, on-off element Q2 are metal-oxide-semiconductor; The output terminal of described comparer U1 connects the grid of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 respectively, and metal-oxide-semiconductor Q1 is connected between L channel output terminal L and ground, and metal-oxide-semiconductor Q2 is connected between R channel output terminal R and ground.
Preferably, described on-off element Q1, on-off element Q2 are triode; The base stage of the output terminal difference connecting triode Q1 and triode Q2 of described comparer U1, triode Q1 is connected between L channel output terminal L and ground, and triode Q2 is connected between R channel output terminal R and ground.
Preferably, described on-off element Q1 is metal-oxide-semiconductor, and on-off element Q2 is relay; The output terminal of described comparer U1 connects the grid of metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 is connected between internal electric source input end P3 and ground, internal electric source input end P3 is connected to the coil input end of relay J 1, and the normally closed stationary contact of relay J 1 is connected with left and right acoustic channels output terminal, its moving contact ground connection.
The present invention also proposes a kind ofly to employ the above-mentioned vehicle carried video system with the Power supply detector of automatic mute, comprise the system power supply power supply of powering for whole system, receive source of sound to go forward side by side the sound processing chip of row relax, receive the sound source signal after process and carry out the power discharging device of power amplification, it is characterized in that, also comprise the Power supply detector of the power supply signal of receiving system power supply output and the source of sound pre-output signal of sound processing chip output, described Power supply detector is outputed signal is sent to power discharging device, this Power supply detector comprises comparer U1, the in-phase input end of described comparer U1 accesses datum by a resistance R6 connected and inductance L 3, the inverting input of comparer U1 is by a resistance R60 connecting system power supply signal, the output terminal of comparer U1 is connected with on-off element Q1 and on-off element Q2, for controlling the output of left and right sound track signals.
Preferably, described on-off element Q1, on-off element Q2 are metal-oxide-semiconductor; The output terminal of described comparer U1 connects the grid of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 respectively, and metal-oxide-semiconductor Q1 is connected between L channel output terminal L and ground, and metal-oxide-semiconductor Q2 is connected between R channel output terminal R and ground.
Preferably, described on-off element Q1, on-off element Q2 are triode; The base stage of the output terminal difference connecting triode Q1 and triode Q2 of described comparer U1, triode Q1 is connected between L channel output terminal L and ground, and triode Q2 is connected between R channel output terminal R and ground.
Preferably, described on-off element Q1 is metal-oxide-semiconductor, and on-off element Q2 is relay; The output terminal of described comparer U1 connects the grid of metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 is connected between internal electric source input end P3 and ground, internal electric source input end P3 is connected to the coil input end of relay J 1, and the normally closed stationary contact of relay J 1 is connected with left and right acoustic channels output terminal, its moving contact ground connection.
Compared with prior art, tool of the present invention has the following advantages: one, improve the interference rejection ability of sound processing chip to power supply, serve the effect of Sound control in terminal; Two, automatically cut off from source sound, without the need to the control of software, and the setting of Power supply detector and control can be flexible and changeable.
Accompanying drawing explanation
Fig. 1 is the circuit diagram with the Power supply detector of automatic mute of the embodiment of the present invention one.
Fig. 2 is the vehicle carried video system architecture schematic diagram of the embodiment of the present invention.
Fig. 3 is the circuit diagram with the Power supply detector of automatic mute of the embodiment of the present invention two.
Fig. 4 is the circuit diagram with the Power supply detector of automatic mute of the embodiment of the present invention three.
Embodiment
In order to allow those skilled in the art understand technical scheme of the present invention better, below in conjunction with accompanying drawing, the present invention is further elaborated.
A kind of specific embodiment one with the Power supply detector of automatic mute provided by the invention as shown in Figure 1, comprise comparer U1, the in-phase input end of described comparer U1 accesses datum by a resistance R6 connected and inductance L 3, the inverting input of comparer U1 is by a resistance R60 connecting system power supply signal, the output terminal of comparer U1 is connected with on-off element Q1 and on-off element Q2, for controlling the output of left and right sound track signals.On-off element Q1, on-off element Q2 are metal-oxide-semiconductor; The output terminal of described comparer U1 connects the grid of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 respectively, and metal-oxide-semiconductor Q1 is connected between L channel output terminal L and ground, and metal-oxide-semiconductor Q2 is connected between R channel output terminal R and ground.
And, the Power supply detector of what above-mentioned Fig. 1 disclosed have automatic mute can be applicable in vehicle carried video system, specifically as shown in Figure 2, this vehicle carried video system comprises the system power supply power supply 1 of powering for whole system, receive source of sound 5, to go forward side by side the sound processing chip 2 of row relax, receive the sound source signal after process and carry out the power discharging device 3 of power amplification, also comprise the Power supply detector 4 of the power supply signal of receiving system power supply 1 output and the source of sound pre-output signal of sound processing chip 2 output, described Power supply detector 4 is outputed signal is sent to power discharging device 3.Wherein, source of sound pre-output signal comprises L channel output signal and R channel output signal.This Power supply detector 4 is consistent with circuit in accompanying drawing 1, does not repeat at this.
For vehicle carried video system, the engine after onboard system uses storage battery and automobile starting provides power supply to carry out work, and stability and anti-interference all can have complicated change.As can be seen from Figure 2, source of sound 5 exports the rear power discharging device 3 that directly do not enter into from sound processing chip 2 and carries out sound amplification output, but first pre-entered is to Power supply detector 4, determines whether export amplification after being judged in advance by Power supply detector 4 again.And the triggering function of Power supply detector 4 comes from the power supply signal that system power supply power supply 1 exports itself.
By introducing operating voltage and the datum of comparer at the port REF of vehicle carried video internal system, the power supply signal that Power supply detector 4 detects is accessed by port PO WER, the left channel signals of vehicle carried video system exports from port L, and its right-channel signals exports from port R.Detected in real time by the power supply signal exported system power supply power supply 1, comparer U1 compares the size of this power supply signal and datum.When power supply signal is lower than compare threshold, comparer U1 output low level, now metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 closes, and the signal of left and right acoustic channels directly exports; When power supply signal exceedes compare threshold, comparer U1 exports high level, thus controls metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 conducting, and the signal of port L and port R is introduced into ground, effectively prevent the voice output of left and right acoustic channels, thus accomplish the voice output effectively controlling left and right acoustic channels.
Embodiments of the invention two, as shown in Figure 3, wherein on-off element Q1, on-off element Q2 are triode.The base stage of the output terminal difference connecting triode Q1 and triode Q2 of comparer U1, triode Q1 is connected between L channel output terminal L and ground, and triode Q2 is connected between R channel output terminal R and ground.Detected in real time by the power supply signal exported system power supply power supply 1, comparer U1 compares the size of this power supply signal and datum.When power supply signal is lower than compare threshold, comparer U1 output low level, now triode Q1 and triode Q2 closes, and the signal of left and right acoustic channels directly exports from the collector of two triodes respectively; When power supply signal exceedes compare threshold, comparer U1 exports high level, thus controls triode Q1 and triode Q2 conducting, and the signal of port L and port R is introduced into ground.In the present embodiment, other parts are all consistent with embodiment one.
Embodiments of the invention three, as shown in Figure 4, wherein on-off element Q1 is metal-oxide-semiconductor, and on-off element Q2 is relay.The output terminal of comparer U1 connects the grid of metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 is connected between internal electric source input end P3 and ground, internal electric source input end P3 is connected to the coil input end of relay J 1, and the normally closed stationary contact of relay J 1 is connected with left and right acoustic channels output terminal, its moving contact ground connection.Detected in real time by the power supply signal exported system power supply power supply 1, comparer U1 compares the size of this power supply signal and datum.When power supply signal is lower than compare threshold, comparer U1 output low level, now metal-oxide-semiconductor Q3 closes, the current signal flowing through coil that internal electric source input end P3 provides, moving contact is connected to often opens stationary contact, and the signal of left and right acoustic channels directly exports from the normally closed stationary contact of relay J 1; When power supply signal exceedes compare threshold, comparer U1 exports high level, thus controls metal-oxide-semiconductor Q3 conducting, the current signal of internal electric source input end P3 is introduced into ground, the coil no current process of relay J 1, moving contact is connected to normally closed stationary contact, and the signal of port L and port R is introduced into ground.In the present embodiment, other parts are all consistent with embodiment one.
In addition, the power discharging device 3 that the present embodiment adopts, sound processing chip 2, system power supply power supply 1 all can adopt the existing technology in this area, also do not repeat at this.
The above is better embodiment of the present invention, not does any pro forma restriction to the present invention.It should be noted that; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (8)
1. one kind has the Power supply detector of automatic mute, comprise comparer U1, it is characterized in that, the in-phase input end of described comparer U1 accesses datum by a resistance R6 connected and inductance L 3, the inverting input of comparer U1 is by a resistance R60 connecting system power supply signal, the output terminal of comparer U1 is connected with on-off element Q1 and on-off element Q2, for controlling the output of left and right sound track signals.
2. the Power supply detector with automatic mute according to claim 1, is characterized in that, described on-off element Q1, on-off element Q2 are metal-oxide-semiconductor; The output terminal of described comparer U1 connects the grid of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 respectively, and metal-oxide-semiconductor Q1 is connected between L channel output terminal L and ground, and metal-oxide-semiconductor Q2 is connected between R channel output terminal R and ground.
3. the Power supply detector with automatic mute according to claim 1, is characterized in that, described on-off element Q1, on-off element Q2 are triode; The base stage of the output terminal difference connecting triode Q1 and triode Q2 of described comparer U1, triode Q1 is connected between L channel output terminal L and ground, and triode Q2 is connected between R channel output terminal R and ground.
4. the Power supply detector with automatic mute according to claim 1, is characterized in that, described on-off element Q1 is metal-oxide-semiconductor, and on-off element Q2 is relay; The output terminal of described comparer U1 connects the grid of metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 is connected between internal electric source input end P3 and ground, internal electric source input end P3 is connected to the coil input end of relay J 1, and the normally closed stationary contact of relay J 1 is connected with left and right acoustic channels output terminal, its moving contact ground connection.
5. a vehicle carried video system, comprise the system power supply power supply (1) of powering for whole system, receive source of sound (5) to go forward side by side the sound processing chip (2) of row relax, receive the sound source signal after process and carry out the power discharging device (3) of power amplification, it is characterized in that, also comprise the Power supply detector (4) of power supply signal that receiving system power supply (1) exports and the source of sound pre-output signal that sound processing chip (2) exports, described Power supply detector (4) is outputed signal is sent to power discharging device (3), this Power supply detector comprises comparer U1, the in-phase input end of described comparer U1 accesses datum by a resistance R6 connected and inductance L 3, the inverting input of comparer U1 is by a resistance R60 connecting system power supply signal, the output terminal of comparer U1 is connected with on-off element Q1 and on-off element Q2, for controlling the output of left and right sound track signals.
6. vehicle carried video system according to claim 5, is characterized in that, described on-off element Q1, on-off element Q2 are metal-oxide-semiconductor; The output terminal of described comparer U1 connects the grid of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 respectively, and metal-oxide-semiconductor Q1 is connected between L channel output terminal L and ground, and metal-oxide-semiconductor Q2 is connected between R channel output terminal R and ground.
7. vehicle carried video system according to claim 5, is characterized in that, described on-off element Q1, on-off element Q2 are triode; The base stage of the output terminal difference connecting triode Q1 and triode Q2 of described comparer U1, triode Q1 is connected between L channel output terminal L and ground, and triode Q2 is connected between R channel output terminal R and ground.
8. vehicle carried video system according to claim 5, is characterized in that, described on-off element Q1 is metal-oxide-semiconductor, and on-off element Q2 is relay; The output terminal of described comparer U1 connects the grid of metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 is connected between internal electric source input end P3 and ground, internal electric source input end P3 is connected to the coil input end of relay J 1, and the normally closed stationary contact of relay J 1 is connected with left and right acoustic channels output terminal, its moving contact ground connection.
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| CN201310644634.6A CN104698393A (en) | 2013-12-05 | 2013-12-05 | Power detector with automatic muting function and vehicle-borne audio-visual system |
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| CN201310644634.6A CN104698393A (en) | 2013-12-05 | 2013-12-05 | Power detector with automatic muting function and vehicle-borne audio-visual system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6118295A (en) * | 1997-04-16 | 2000-09-12 | Nec Corporation | Power supply voltage detection device |
| CN101111094A (en) * | 2006-07-21 | 2008-01-23 | 大同股份有限公司 | Noise preventing module and its public address set |
| CN101191823A (en) * | 2006-11-24 | 2008-06-04 | 北京中电华大电子设计有限责任公司 | Low power consumption electric source monitoring circuit |
| CN101340736A (en) * | 2007-07-04 | 2009-01-07 | 鸿富锦精密工业（深圳）有限公司 | POP noise suppressing circuit |
| CN101388188A (en) * | 2007-09-11 | 2009-03-18 | 奇景光电股份有限公司 | Source driver and noise suppression method thereof |
| CN102905212A (en) * | 2011-07-25 | 2013-01-30 | 冠捷投资有限公司 | Anti-sonic boom display device and audio signal processing device |
| CN203324367U (en) * | 2013-07-23 | 2013-12-04 | 惠州市德赛西威汽车电子有限公司 | Voltage detection circuit |
-
2013
- 2013-12-05 CN CN201310644634.6A patent/CN104698393A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6118295A (en) * | 1997-04-16 | 2000-09-12 | Nec Corporation | Power supply voltage detection device |
| CN101111094A (en) * | 2006-07-21 | 2008-01-23 | 大同股份有限公司 | Noise preventing module and its public address set |
| CN101191823A (en) * | 2006-11-24 | 2008-06-04 | 北京中电华大电子设计有限责任公司 | Low power consumption electric source monitoring circuit |
| CN101340736A (en) * | 2007-07-04 | 2009-01-07 | 鸿富锦精密工业（深圳）有限公司 | POP noise suppressing circuit |
| CN101388188A (en) * | 2007-09-11 | 2009-03-18 | 奇景光电股份有限公司 | Source driver and noise suppression method thereof |
| CN102905212A (en) * | 2011-07-25 | 2013-01-30 | 冠捷投资有限公司 | Anti-sonic boom display device and audio signal processing device |
| CN203324367U (en) * | 2013-07-23 | 2013-12-04 | 惠州市德赛西威汽车电子有限公司 | Voltage detection circuit |
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Address after: 516006 Guangdong province Huizhou City Zhongkai high tech Zone and five West Road No. 103 Applicant after: HUIZHOU DESAY SV AUTOMOTIVE CO., LTD. Address before: 516006 Guangdong province Huizhou City Zhongkai high tech Zone and five West Road No. 103 Applicant before: Huizhou Desay SV Auto. Electronics Co., Ltd. |
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Application publication date: 20150610 |
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