CN1767375A - Device for eliminating digital audio apparatus noise - Google Patents
Device for eliminating digital audio apparatus noise Download PDFInfo
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- CN1767375A CN1767375A CN 200410084139 CN200410084139A CN1767375A CN 1767375 A CN1767375 A CN 1767375A CN 200410084139 CN200410084139 CN 200410084139 CN 200410084139 A CN200410084139 A CN 200410084139A CN 1767375 A CN1767375 A CN 1767375A
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Abstract
The invention relates to a dispelling digital audio frequency device POP noise device which can make the power stable and dispel the noise when the power closed. The invention has left/right loudspeaker. It comprises: an audio frequency device power amplifier which amplifies and outputs the inputted audio frequency signal, a power input device which receives the common power and provides the driving power to the audio frequency device power amplifier and the audio frequency output power to the left/right loudspeaker; if it inputs the power closed order, it dispels the POP noise of the left/right loudspeaker.
Description
Technical field
The present invention relates to the digital audio-frequency apparatus amplifier, specifically, the present invention relates to the digital audio-frequency apparatus amplifier when power-off, the elimination noise equipment of the digital audio-frequency apparatus amplifier of the explosive noise that is used for eliminating in the loud speaker and is produced.
Background technology
In general, in all machines that sound is provided to us, amplifier is installed all.Briefly, amplifier is exactly that the signal that has being imported amplifies, and makes us can listen the equipment that obtains audio function, and it is the shorthand of amplifying loudspeaker (amplifier), and with the words of our country, it also can be called ' amplifier '.
Because we generally are referred to as amplifier, so it is easy to allow the people associate the complex machines that many action buttons partly are installed in front, but the fact is not such.From the small-sized high type audio frequency apparatus of hearing with oneself, all have amplifier.
Where the basic function of amplifier all is that sound is amplified, because the sound that sends from sound source can't be adjusted to big sound arbitrarily, so the maximum most important function of amplifier is amplified voice signal exactly.
(amplifier, kind Amplifier) can be divided into preamplifier, power amplifier, integrated form amplifier and receiving type amplifier etc. to AMP.Here, the major function of above-mentioned power amplifier is to play in loud speaker for the signal that preamplifier is received, and electric power is provided.
Therefore, the power amplifier just that conforms to most with the effect of original amplifier of ' amplification ' in fact, so in other words, it also can be called as ' main amplifier '.
Below with reference to accompanying drawings the formation according to the digital audio-frequency apparatus of original technology is described.
Fig. 1 is the constituent components figure that shows according to the digital audio-frequency apparatus of original technology.
As shown in Figure 1, formed by following each several part according to the digital audio-frequency apparatus of original technology: the power supply input unit 10 that is used to provide power supply; Drive behind the power supply that reception is provided by above-mentioned power supply input unit 10, and the audio signal of being imported is amplified, make it the audio frequency apparatus power amplifier 20 that a left side/right side loud speaker 31,32 is exported by loud speaker 30.
Digital audio-frequency apparatus with original technology of foundation of above-mentioned formation is that the power supply that will be imported by above-mentioned power supply input unit 10 is divided into (L) two parts of the audio frequency output Vcc (R) that is used to drive the power Vcc of above-mentioned audio frequency apparatus power amplifier and is used for an above-mentioned left side/ right loud speaker 31,32 outputs, then, be input to simultaneously in the above-mentioned audio frequency apparatus power amplifier 20.
Therefore, as (a) of Fig. 2 with (b), the digital audio-frequency apparatus of the original technology of foundation with this formation is input to an above-mentioned left side/right side loud speaker 31,32 out-put supplies (Vcc) in the above-mentioned audio frequency apparatus power amplifier 20 and the driving power (Vcc) of above-mentioned audio frequency apparatus power amplifier 20 and lowers simultaneously when power-off.
Therefore, on an above-mentioned left side/and moment that the driving power (Vcc) of right side loud speaker 31,32 out-put supplies (Vcc) and above-mentioned audio frequency apparatus power amplifier 20 lowers simultaneously, just exist the power supply equalization problem of unstable in above-mentioned audio frequency apparatus power amplifier 20 inside.
Simultaneously, because power supply is unbalanced, the left side in the above-mentioned audio frequency apparatus power amplifier 20/right side loud speaker 31,32 out-put supplies (Vcc) just are among the abnormal operating condition, can cause another problem that produces bang bang (POP) noise thus.
Summary of the invention
In order to address the above problem, the present invention just arises at the historic moment, and the objective of the invention is to make when the digital audio-frequency apparatus power-off power supply stable equilibrium.
Simultaneously, another object of the present invention is bang bang (POP) noise that is sent when eliminating power-off.
To achieve these goals, formation according to elimination digital audio apparatus noise equipment of the present invention has following characteristics: comprise following each several part in the digital audio-frequency apparatus that possesses a left side/right loud speaker: the audio signal of being imported is amplified the audio frequency apparatus power amplifier of the line output of going forward side by side; The power supply of being imported commonly used is received, and driving power is provided and the power supply input unit of audio frequency out-put supply is provided to an above-mentioned left side/right loud speaker to above-mentioned audio frequency apparatus power amplifier; If imported the powered-down order, just eliminate the noise cancellation element of the noise that above-mentioned audio frequency apparatus power amplifier sent.
If it is more satisfactory that above-mentioned power supply input unit has following characteristics: constituted by the 1st capacitor C1 that the input power supply is carried out charge/discharge.
If it is even more ideal that above-mentioned noise cancellation element has the characteristics that are made of following each several part: the diode D1 that the 1st capacitor of anodal and above-mentioned power supply input unit is connected; One end is connected with the negative pole of above-mentioned diode D1, the 2nd capacitor C2 of other end ground connection.
If it is even more ideal that above-mentioned noise cancellation element has following feature: receive the power supply that above-mentioned power supply input unit is exported, when the power-off of above-mentioned audio frequency apparatus power amplifier and an above-mentioned left side/right side loud speaker, provide power supply to it with different sizes.
As mentioned above, the present invention has following effect: the input power supply and the out-put supply of audio frequency apparatus power amplifier differentially are provided, make the user when the order of input powered-down, can eliminate the noise that originally often sends.
Description of drawings
Fig. 1 is the power supply pie graph that shows according to the digital audio-frequency apparatus power amplifier of original technology;
Fig. 2 is the power source change oscillogram of digital audio-frequency apparatus power amplifier when power-off that shows according to original technology;
Fig. 3 is the component drawings that shows according to elimination digital audio apparatus noise equipment of the present invention;
Fig. 4 shows according to the power source change oscillogram of digital audio-frequency apparatus power amplifier of the present invention when power-off.
Accompanying drawing major part symbol description
10: power supply input unit 100: the noise cancellation element
20: audio frequency apparatus power amplifier 30: loud speaker
Embodiment
Below with reference to accompanying drawings to being described in more detail according to elimination digital audio apparatus noise equipment of the present invention.
Fig. 3 is the component drawings that shows according to elimination digital audio apparatus noise equipment of the present invention.Fig. 4 shows according to the power source change oscillogram of digital audio-frequency apparatus power amplifier of the present invention when power-off.
As shown in Figure 3, constituted by following each several part according to elimination digital audio apparatus noise equipment of the present invention: the audio frequency apparatus power amplifier 20 that the audio signal of being imported is amplified the line output of going forward side by side; Audio signal after will amplifying by above-mentioned audio frequency apparatus power amplifier 20 respectively from a left side/loud speaker 30 of two sides, right side output; The power supply of being imported commonly used is received, and driving power is provided and provides the power supply input unit 10 of audio frequency out-put supply to an above-mentioned left side/ right loud speaker 31,32 to above-mentioned audio frequency apparatus power amplifier 20; If imported the powered-down order, just eliminate the noise cancellation element 100 of the noise that above-mentioned audio frequency apparatus power amplifier 20 sent.
Above-mentioned power supply input unit 10 is by carrying out charge/discharge to the above-mentioned power supply of importing, and the 1st capacitor C1 of the line output of going forward side by side constitutes.Above-mentioned noise cancellation element 100 is made of following each several part: the diode D1 that the 1st capacitor of anodal and above-mentioned power supply input unit is connected; One end is connected with the negative pole of above-mentioned diode D1, the 2nd capacitor C2 of other end ground connection.
As shown in Figure 3, in the digital audio-frequency apparatus of the present invention of the foundation with above-mentioned formation, the output of above-mentioned power supply input unit 10 is connected with diode D1, the power supply of being imported has been divided into 2 parts, the negative pole of above-mentioned diode D1 is connected with the 2nd capacitor C2, and the condenser capacity of each end has nothing in common with each other.
In this case, above-mentioned audio frequency apparatus power amplifier 20 is to power supply that an above-mentioned left side/ right loud speaker 31,32 power ends that provided have only the 1st capacitor C1 of above-mentioned power supply input unit 10 to pass through; And also have only the power supply that is provided through above-mentioned the 2nd capacitor C2 after the diode D1 separation of above-mentioned noise cancellation element 100 at the driving power input of above-mentioned audio frequency apparatus power amplifier 20.
Therefore, as shown in Figure 4, if to importing the powered-down order according to digital audio-frequency apparatus of the present invention, above-mentioned audio frequency apparatus power amplifier 20 is powered-down to an above-mentioned left side/ right loud speaker 31,32 power supplys of being exported under the t1 state, and just should become the driving power of above-mentioned audio frequency apparatus power amplifier 20 constantly at t.
That is, if the power supply that is provided to the driving power input maintains under the situation of normal height (high), under the t1 state, because the out-put supply of above-mentioned audio frequency apparatus power amplifier 20 drops to low state, so just the situation of misoperation does not take place in audio frequency output.
Simultaneously, behind certain hour (t-t1), the driving power of above-mentioned audio frequency apparatus power amplifier 20 drops to low state, and the out-put supply of above-mentioned audio frequency apparatus power amplifier 20 is kept low state, so also do not produce noise.
Simultaneously, in above-mentioned certain hour (t-t1), along with the variation of above-mentioned the 2nd capacitor C2 capacity, can directly regulate, along with the variation of above-mentioned the 2nd capacitor C2 capacity, noise also just has been eliminated.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.Therefore, the technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to interest field.
Claims (4)
1, a kind of equipment of eliminating digital audio apparatus noise, with regard to the digital audio-frequency apparatus that possesses a left side/right loud speaker, it comprises: the audio signal of being imported is amplified the audio frequency apparatus power amplifier of the line output of going forward side by side; The power supply of being imported commonly used is received, and driving power is provided and the power supply input unit of audio frequency out-put supply is provided to an above-mentioned left side/right loud speaker to above-mentioned audio frequency apparatus power amplifier; If imported the powered-down order, just eliminate the noise cancellation element of the noise that above-mentioned audio frequency apparatus power amplifier sent.
2, the equipment of elimination digital audio apparatus noise as claimed in claim 1 is characterized in that, above-mentioned power supply input unit comprises the 1st capacitor (C1) that the input power supply is carried out charge/discharge.
3, the equipment of elimination digital audio apparatus noise as claimed in claim 1 is characterized in that, above-mentioned noise cancellation element comprises: the diode (D1) that the 1st capacitor of anodal and above-mentioned power supply input unit is connected; One end is connected with the negative pole of above-mentioned diode (D1), the 2nd capacitor (C2) of other end ground connection.
4, the equipment of elimination digital audio apparatus noise as claimed in claim 1, it is characterized in that, above-mentioned noise cancellation element receives the power supply that above-mentioned power supply input unit is exported, when the power-off of above-mentioned audio frequency apparatus power amplifier and an above-mentioned left side/right side loud speaker, provide power supply to it with different sizes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410084139 CN1767375A (en) | 2004-10-25 | 2004-10-25 | Device for eliminating digital audio apparatus noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410084139 CN1767375A (en) | 2004-10-25 | 2004-10-25 | Device for eliminating digital audio apparatus noise |
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| Publication Number | Publication Date |
|---|---|
| CN1767375A true CN1767375A (en) | 2006-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410084139 Pending CN1767375A (en) | 2004-10-25 | 2004-10-25 | Device for eliminating digital audio apparatus noise |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102547528A (en) * | 2012-01-04 | 2012-07-04 | 深圳市宽宏科技有限公司 | Booting moment mute circuit |
| US8218793B2 (en) | 2006-12-11 | 2012-07-10 | Mediatek Inc. | Apparatus and muting circuit |
| CN102726061A (en) * | 2009-11-19 | 2012-10-10 | 苹果公司 | Electronic device and external equipment with digital noise cancellation and digital audio path |
| CN103365325A (en) * | 2012-04-10 | 2013-10-23 | 快捷半导体(苏州)有限公司 | Audio device switching control apparatus and methods |
| CN103402157A (en) * | 2013-08-02 | 2013-11-20 | 北京昆腾微电子有限公司 | Audio-frequency circuit and method for eliminating POP noises |
-
2004
- 2004-10-25 CN CN 200410084139 patent/CN1767375A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8218793B2 (en) | 2006-12-11 | 2012-07-10 | Mediatek Inc. | Apparatus and muting circuit |
| CN102726061A (en) * | 2009-11-19 | 2012-10-10 | 苹果公司 | Electronic device and external equipment with digital noise cancellation and digital audio path |
| CN102547528A (en) * | 2012-01-04 | 2012-07-04 | 深圳市宽宏科技有限公司 | Booting moment mute circuit |
| CN103365325A (en) * | 2012-04-10 | 2013-10-23 | 快捷半导体(苏州)有限公司 | Audio device switching control apparatus and methods |
| CN103365325B (en) * | 2012-04-10 | 2015-05-13 | 快捷半导体(苏州)有限公司 | Audio device switching control apparatus and methods |
| CN103402157A (en) * | 2013-08-02 | 2013-11-20 | 北京昆腾微电子有限公司 | Audio-frequency circuit and method for eliminating POP noises |
| CN103402157B (en) * | 2013-08-02 | 2016-09-28 | 昆腾微电子股份有限公司 | Voicefrequency circuit, audio system and the method eliminating POP noise |
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