CN1956523B - Device and method for removing noise of TV set off - Google Patents
Device and method for removing noise of TV set off Download PDFInfo
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- CN1956523B CN1956523B CN2005101147752A CN200510114775A CN1956523B CN 1956523 B CN1956523 B CN 1956523B CN 2005101147752 A CN2005101147752 A CN 2005101147752A CN 200510114775 A CN200510114775 A CN 200510114775A CN 1956523 B CN1956523 B CN 1956523B
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Abstract
This invention discloses a device and a method for eliminating noises when turning off TV, which stores energy when the TV works normally and discharges swiftly when turning off the TV by an electronic energy storing device to generate a control potential, the time generated by which is shorter than that of signal wave of accompanying channels when the TV is turned off so that the audio amplifier is suppressed before the wave caused by turning off the TV of the accompanying sound channel signal is transferred to the amplifier so as to eliminate the turning-off noises.
Description
Technical field
The present invention relates to the noise suppression field, relate in particular to the device and method that a kind of television set shutdown abates the noise.
Technical background
Along with the raising of people's living standard, no matter the rural area still is the necessity that the cities and towns television set has become people's daily life, but current TV is being started shooting, changed in the operations such as platform, shutdown and can send noise, not only annoying but also power consumption.
Entangle its a kind of reason that produces noise and be that sound treatment circuit has unusual fluctuations, this fluctuation to output to loud speaker through the audio frequency amplifier amplification and just becomes bigger noise when starting shooting, changing operation such as platform, shutdown.
For this reason, one of measure of eliminating noise be the enable voice treatment circuit when carrying out above operation, do not fluctuate, but some is because of integrated circuit decision itself difficulty realization; The 2nd, allow the audio frequency amplifier not output sound signal that quits work, television set is mostly taked this kind measure at present.
Concrete mode is to control by MCU, in changing the platform operating process, MCU makes the mute pin of MCU send a CONTROLLED POTENTIAL earlier and removes the control audio amplifier before platform action is changed in execution, allows amplifier quit work, sound is not exported, and then carry out and change the platform action, so the signal fluctuation of the sound processing path that brings, even this fluctuation is sent to amplifier,, can not cause noise because of the amplifier no-output yet.In when start, also make the mute pin of MCU send a CONTROLLED POTENTIAL earlier and remove the control audio amplifier, allow amplifier hysteresis work, sound lags behind and exports, so the signal fluctuation of the sound processing path that brings, even this fluctuation is sent to amplifier,, can not cause noise because of the amplifier no-output yet.
Aforesaid way is in start, and it is very effective to change operation such as platform, and this moment, the MCU power supply was normal, and it is also normal to work.But: when power-off operation, still can send noise sometimes, this is not because MCU has power supply after shutdown, quit work, it is quit work for the audio frequency amplifier control signal, and this moment audio frequency amplifier because of big capacity energy-storage travelling wave tube is arranged, can also delay working a period of time, audio frequency amplifier is longer than the MCU time-delay, also promptly shutdown back sound accompaniment circuit discharge time greater than the MCU circuit discharging time, sound accompaniment this moment treatment channel signal causes noise because of the fluctuation that shutdown causes can be sent to audio frequency amplifier thereby output to loud speaker.
Summary of the invention
The objective of the invention is to overcome the prior art defective, a kind of device and method of eliminating noise of TV set off is provided.
For achieving the above object, the present invention has adopted following technical scheme:
The device of elimination noise of TV set off of the present invention comprises an electron stored energy device, and this electron stored energy device is connected between the MUTE control pin of the MUTE control pin of MCU and audio frequency amplifier,
The energy storage when the television set operate as normal of described electron stored energy device;
Described electron stored energy device discharges when television set shuts down;
Described electron stored energy device discharge generation CONTROLLED POTENTIAL control audio amplifier stops voice output;
Described electron stored energy device discharge generation CONTROLLED POTENTIAL control audio amplifier stops voice output and need meet the following conditions:
(1) emitter of triode Q1 must have voltage to have the energy-storage travelling wave tube CD1 energy storage in the just described electron stored energy device;
(2) resistance (R1)＞(R2) in the described electron stored energy device and 10K≤(R1)≤100K;
(3) supply voltage (the Ua)≤50V of described electron stored energy device access;
Described power supply Ua chooses one group from TV set power secondary commutation circuit, the selection of this group voltage output as follows:
One: select below 50V, if the voltage of selecting output is too high, may cause components and parts to damage, circuit reliability descends;
Two: observe by oscilloscope, every group of output of power supply secondary commutation circuit all is connected to oscilloscope, under identical situation, carries out power-off operation with reference to amount, which group output of contrast descends the fastest, select to descend the fastest one group of discharge when just shutting down is the fastest one group;
(4) triode (Q1) conducting is enough fast in the described electron stored energy device;
The described Ua of Xuan Zeing can guarantee described Q1 conducting speed by the way, thereby guarantees that the time ratio shutdown that produces CONTROLLED POTENTIAL causes the time of sound channel signal fluctuation little.
Another object of the present invention provides a kind of method of eliminating noise of TV set off, and this method may further comprise the steps:
Step 1: before the tv audio power amplifier, increase by an electron stored energy device;
Step 2: electron stored energy device energy storage when the television set operate as normal;
Step 3: when television set shuts down, the discharge of electron stored energy device;
Step 4: electron stored energy device discharge generation CONTROLLED POTENTIAL control audio power amplifier stops voice output.
Electron stored energy device discharge generation CONTROLLED POTENTIAL control audio amplifier stops voice output and need meet the following conditions in the described step 4:
(1) emitter of triode Q1 must have voltage to have the energy-storage travelling wave tube CD1 energy storage in the just described electron stored energy device;
(2) resistance (R1)＞(R2) in the described electron stored energy device and 10K≤(R1)≤100K;
(3) supply voltage (the Ua)≤50V of described electron stored energy device access;
Described power supply Ua chooses one group from TV set power secondary commutation circuit, the selection of this group voltage output as follows:
One: select below 50V, if the voltage of selecting output is too high, may cause components and parts to damage, circuit reliability descends;
Two: observe by oscilloscope, every group of output of power supply secondary commutation circuit all is connected to oscilloscope, under identical situation, carries out power-off operation with reference to amount, which group output of contrast descends the fastest, select to descend the fastest one group of discharge when just shutting down is the fastest one group;
(4) triode (Q1) conducting is enough fast in the described electron stored energy device;
The described Ua of Xuan Zeing can guarantee described Q1 conducting speed by the way, thereby guarantees that the time ratio shutdown that produces CONTROLLED POTENTIAL causes the time of sound channel signal fluctuation little.
The present invention can bring following beneficial effect:
1, the application of the device and method of elimination noise of TV set off of the present invention can effectively solve the noise problem that the television set shutdown produces.
2, because the electron stored energy device that adopts among the present invention is energy storage in the television set course of normal operation, work during the television set shutdown is so also can save the electric quantity consumption that a part is brought because of noise to a certain extent.
3, device and method of the present invention can not only be eliminated the noise that the television set shutdown produces, and is applicable to that also electrical equipment shutdown noises of other application power amplifiers are dealt with problems.
4, device and method of the present invention, structure and step are all simpler, very convenient enforcement.The present invention is described in further detail below in conjunction with description of drawings and specific embodiment:
Description of drawings
Fig. 1 is a prior art tv audio amplifier control chart
Fig. 2 is the circuit diagram of the embodiment of the invention 1
Fig. 3 is the circuit diagram of the embodiment of the invention 2
Embodiment
Fig. 1 is a prior art tv audio amplifier control chart, and with reference to figure 1: original audio frequency amplifier control chart is the MUTE control pin that MUTE signal that TV MCU is sent is directly delivered to audio frequency amplifier.
The present invention has increased the device of eliminating noise of TV set off between the MUTE of MCU and audio frequency amplifier control pin, with reference to figure 2 or Fig. 3: this device comprises an electron stored energy device, and described electron stored energy device circuit is by energy-storage travelling wave tube CD1, triode Q1, resistance R
2Constitute with diode D2.
The b utmost point of described triode Q1 connects resistance R
1, its e utmost point connects the conduction terminal of diode D2; Described triode Q1 must be the PNP pipe.
The positive pole of described energy-storage travelling wave tube CD1 connects the e utmost point of triode Q1 and the conduction terminal of diode D2, minus earth.Described energy-storage travelling wave tube can be electric capacity, inductance or other magnetic elements, preferred alminium electrolytic condenser.
Described diode D2 connects resistance R by end
2, R
2The other end connect resistance R
1Described electron stored energy device circuit also comprises diode D3, described diode D3 and R
2Be connected in parallel, in order to accelerate the conducting speed of Q1.
The method of elimination noise of TV set off of the present invention may further comprise the steps:
Step 1: before the tv audio power amplifier, increase by an electron stored energy device;
Step 2: electron stored energy device energy storage when the television set operate as normal;
Step 3: when television set shuts down, the discharge of electron stored energy device;
Step 4: electron stored energy device discharge generation CONTROLLED POTENTIAL control audio power amplifier stops voice output.
The time that will make electron stored energy device discharge generation CONTROLLED POTENTIAL control audio power amplifier stop voice output requirement electron stored energy device discharge generation CONTROLLED POTENTIAL in the described step 4 must cause the time of sound channel signal fluctuation little than shutdown, thereby suppresses audio frequency amplifier before the fluctuation that the sound channel signal causes because of shutdown is sent to audio frequency amplifier.
Guarantee little must the meeting the following conditions of time that the time ratio shutdown of electron stored energy device discharge generation CONTROLLED POTENTIAL causes the sound channel signal fluctuation:
(1) emitter of triode Q1 must have voltage to have energy-storage travelling wave tube CD1 energy storage just;
(2) the conducting speed of Q1 is enough fast;
(3) Ua≤50V, when guaranteeing shutdown, power supply be added in that voltage on the electron stored energy device will disappear enough soon;
(4) resistance R 1 and R2 value are suitable.R1 selects to be difficult for too little as several K, and too little discharge meeting is too fast, has the possibility of this circuit malfunction; R1 is also not too big, as the resistance of K up to a hundred.Generally select R1 greater than R2, and preferably select 10K≤R1100K, optimum value can selected in concrete application test.
Embodiment 1:
Fig. 2 is the circuit diagram of the embodiment of the invention 1, as shown in Figure 2: the present invention has increased by an electron stored energy device and a correspondent control circuits between the MUTE of MCU and audio frequency amplifier control pin, described control circuit is different and different according to the operating state of audio frequency amplifier, and present embodiment is applicable to the out-of-work control circuit of audio frequency amplifier work control end electronegative potential work high potential.
This control circuit comprises: resistance R 3 and R4, diode D1 and voltage-stabiliser tube DZ1.Wherein the effect of D1 prevents from CONTROLLED POTENTIAL is dragged down, and can protect MCU again; R3, R4, DZ1 limits electric current, voltage, guard amplifier can be avoided the noise that causes because of CONTROLLED POTENTIAL is too high simultaneously again.
Described electron stored energy device is by energy-storage travelling wave tube CD1, triode Q1, resistance R
1And R
2Constitute with diode D2, D3, concrete connected mode repeats no more as shown in Figure 2 here.
Described electron stored energy device is drawn two-terminal, and a termination power Ua, an end connect the MUTE control pin of audio frequency amplifier by control circuit.
Power supply Ua chooses one group from TV set power secondary commutation circuit, the selection of this group voltage output has dual mode:
(1) select below 50V, if the voltage of selecting output is too high, may cause components and parts to damage, circuit reliability descends;
(2) observe by oscilloscope, every group of output of power supply secondary commutation circuit all is connected to oscilloscope, under identical situation, carries out power-off operation with reference to amount, which group output of contrast descends the fastest, select to descend the fastest one group of discharge when just shutting down is the fastest one group.
With cross that aforesaid way selects Ua can guarantee Q1 conducting speed, thereby guarantee that the time ratio shutdown that produces CONTROLLED POTENTIAL causes the time of sound channel signal fluctuation little; This group power supply also will be stablized, and can variation greatly not take place because of power source loads such as image light and shade change, and then causes the Q1 action, the no voice phenomenon of generation television set when operate as normal.
Concrete operation principle as shown in Figure 2, power supply Ua gives energy-storage travelling wave tube CD1 charging by D2 when operate as normal, this moment, triode Q1 was higher than the e utmost point, not conducting because of the b electrode potential.When start, Q1 also is higher than the not conducting of the e utmost point because of the b electrode potential; But when shutdown, Ua power supply no-output, the b electrode potential of triode Q1 also reduces rapidly, the e utmost point because of energy-storage travelling wave tube CD1 and D1 oppositely by keeping original current potential, as Ueb during greater than certain potentials (0.7v usually), the rapid conducting of Q1, thereby the c utmost point obtains high potential, through D4 this high potential is sent to audio frequency amplifier output control pin, realizes that amplifier stops output, noise removing.
Embodiment 2:
Fig. 3 is the circuit diagram of the embodiment of the invention 2, and with reference to figure 3, present embodiment is applicable to the out-of-work control circuit of audio frequency amplifier work control end high potential work electronegative potential.
The present invention has increased by an electron stored energy device and a correspondent control circuits between the MUTE of MCU and audio frequency amplifier control pin, described electron stored energy device constitutes the same, repeats no more, and described control circuit comprises resistance R 3 and R4, triode Q2.
Described circuit working principle repeats no more with embodiment 1.
The noise that the television set shutdown causes can be effectively eliminated in application of the present invention, also is applicable to the solution of other relevant electrical equipment shutdown noise problem simultaneously.
Though the present invention with preferred embodiment openly as above; right its is not in order to limit the present invention; do not deviating under spirit of the present invention and the real situation; those of ordinary skill in the art work as can make corresponding change or distortion according to the present invention, but these corresponding changes or distortion all should belong to the protection range of claims of the present invention.
Claims (2)
1. a device of eliminating noise of TV set off is characterized in that, this device comprises an electron stored energy device, and this electron stored energy device is connected between the MUTE control pin of the MUTE control pin of MCU and audio frequency amplifier,
The energy storage when the television set operate as normal of described electron stored energy device;
Described electron stored energy device discharges when television set shuts down;
Described electron stored energy device discharge generation CONTROLLED POTENTIAL control audio amplifier stops voice output;
Described electron stored energy device discharge generation CONTROLLED POTENTIAL control audio amplifier stops voice output and need meet the following conditions:
(1) emitter of triode Q1 must have voltage to have the energy-storage travelling wave tube CD1 energy storage in the just described electron stored energy device;
(2) resistance (R1)＞(R2) in the described electron stored energy device and 10K≤(R1)≤100K;
(3) supply voltage (the Ua)≤50V of described electron stored energy device access;
Described power supply Ua chooses one group from TV set power secondary commutation circuit, the selection of this group voltage output as follows:
One: select below 50V, if the voltage of selecting output is too high, may cause components and parts to damage, circuit reliability descends;
Two: observe by oscilloscope, every group of output of power supply secondary commutation circuit all is connected to oscilloscope, under identical situation, carries out power-off operation with reference to amount, which group output of contrast descends the fastest, select to descend the fastest one group of discharge when just shutting down is the fastest one group;
(4) triode (Q1) conducting is enough fast in the described electron stored energy device;
The described Ua of Xuan Zeing can guarantee described Q1 conducting speed by the way, thereby guarantees that the time ratio shutdown that produces CONTROLLED POTENTIAL causes the time of sound channel signal fluctuation little.
2. a method of eliminating noise of TV set off may further comprise the steps:
Step 1: before the tv audio power amplifier, increase by an electron stored energy device;
Step 2: electron stored energy device energy storage when the television set operate as normal;
Step 3: when television set shuts down, the discharge of electron stored energy device;
Step 4: electron stored energy device discharge generation CONTROLLED POTENTIAL control audio amplifier stops voice output;
Electron stored energy device discharge generation CONTROLLED POTENTIAL control audio amplifier stops voice output and need meet the following conditions in the described step 4:
(1) emitter of triode Q1 must have voltage to have the energy-storage travelling wave tube CD1 energy storage in the just described electron stored energy device;
(2) resistance (R1)＞(R2) in the described electron stored energy device and 10K≤(R1)≤100K;
(3) supply voltage (the Ua)≤50V of described electron stored energy device access;
Described power supply Ua chooses one group from TV set power secondary commutation circuit, the selection of this group voltage output as follows:
One: select below 50V, if the voltage of selecting output is too high, may cause components and parts to damage, circuit reliability descends;
Two: observe by oscilloscope, every group of output of power supply secondary commutation circuit all is connected to oscilloscope, under identical situation, carries out power-off operation with reference to amount, which group output of contrast descends the fastest, select to descend the fastest one group of discharge when just shutting down is the fastest one group;
(4) triode (Q1) conducting is enough fast in the described electron stored energy device;
The described Ua of Xuan Zeing can guarantee described Q1 conducting speed by the way, thereby guarantees that the time ratio shutdown that produces CONTROLLED POTENTIAL causes the time of sound channel signal fluctuation little.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101147752A CN1956523B (en) | 2005-10-27 | 2005-10-27 | Device and method for removing noise of TV set off |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101147752A CN1956523B (en) | 2005-10-27 | 2005-10-27 | Device and method for removing noise of TV set off |
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| Publication Number | Publication Date |
|---|---|
| CN1956523A CN1956523A (en) | 2007-05-02 |
| CN1956523B true CN1956523B (en) | 2010-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005101147752A Active CN1956523B (en) | 2005-10-27 | 2005-10-27 | Device and method for removing noise of TV set off |
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| CN (1) | CN1956523B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101835071B (en) * | 2010-03-31 | 2013-07-03 | 惠州市德赛西威汽车电子有限公司 | Sound noise control circuit |
| CN102098011B (en) * | 2010-12-28 | 2013-11-06 | 东莞常禾电子有限公司 | Circuit for rapidly controlling mute of audio power amplifier |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4441086A (en) * | 1982-05-13 | 1984-04-03 | General Motors Corporation | Audio system with orderly shutdown sequence |
| CN2419767Y (en) * | 2000-03-30 | 2001-02-14 | 海信集团公司 | Television set with audio processing circuits for remote controlling turning off |
| CN1512660A (en) * | 2002-12-27 | 2004-07-14 | ��ķ�ɷ�����˾ | Electronic device with sound output device |
-
2005
- 2005-10-27 CN CN2005101147752A patent/CN1956523B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4441086A (en) * | 1982-05-13 | 1984-04-03 | General Motors Corporation | Audio system with orderly shutdown sequence |
| CN2419767Y (en) * | 2000-03-30 | 2001-02-14 | 海信集团公司 | Television set with audio processing circuits for remote controlling turning off |
| CN1512660A (en) * | 2002-12-27 | 2004-07-14 | ��ķ�ɷ�����˾ | Electronic device with sound output device |
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| CN1956523A (en) | 2007-05-02 |
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Effective date of registration: 20170531 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Co-patentee after: Qingdao Haier Electric Appliance Co., Ltd. Patentee after: haier group corporation Co-patentee after: QINGDAO HAIER MULTI-MEDIA CO., LTD. Address before: 266101 Haier Industrial Park, 1 Haier Road, Shandong, Qingdao Co-patentee before: Qingdao Haier Electric Appliance Co., Ltd. Patentee before: haier group corporation |