CN205754815U - The circuit of Pop sound during electronic product start can be improved - Google Patents
The circuit of Pop sound during electronic product start can be improved Download PDFInfo
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- CN205754815U CN205754815U CN201620456490.0U CN201620456490U CN205754815U CN 205754815 U CN205754815 U CN 205754815U CN 201620456490 U CN201620456490 U CN 201620456490U CN 205754815 U CN205754815 U CN 205754815U
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- resistance
- electrical switch
- circuit
- foot
- control
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- 230000003321 amplification Effects 0.000 claims abstract description 18
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 18
- 239000004065 semiconductors Substances 0.000 claims description 6
- 230000001702 transmitter Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagrams Methods 0.000 description 1
- 238000005516 engineering processes Methods 0.000 description 1
Abstract
Description
Technical field
This utility model relates to a kind of simple and practical novel circuit improving electronic product start Pop sound.
Background technology
Most electronic products with audio frequency power amplifier, as mobile phone, transmitter receiver, sound system etc. either large or small Pop sound all can occur when start powers on, when this is owing to powering on, system plays pendulum, so that control level state labile, in causing the booting moment t time, audio frequency power amplifier is in opening, thus cause Pop sound, as shown in the waveform A in Fig. 4.The general settling mode eliminating Pop sound is to enable control foot at audio frequency power amplifier to add extra control circuit, makes audio frequency power amplifier be closed at booting moment, thus avoids Pop sound.The mode that this extra circuits solves, not only increases circuit cost, but also adds the difficulty of debugging, thus reduce work efficiency.
Utility model content
In order to overcome the problems referred to above, this utility model when society provides a kind of simple in construction, start audio frequency power amplifier without be closed the start of improved electronic product time the circuit of Pop sound.
The technical solution of the utility model is: provide the circuit of a kind of Pop sound improved when electronic product is started shooting, system control cpu and audio power amplification system including electronic product, it is in series with on-off circuit between control end and the enable foot of audio power amplification system of described system control cpu, described on-off circuit includes electrical switch, the input pin of described electrical switch is connected with described control end, and meets feeder ear VDD by the first resistance R1；The assist control foot of described electrical switch and the common port of the second resistance R2 and the 3rd resistance R3 connect, and the other end of described second resistance R2 is connected with described feeder ear VDD, the other end ground connection of described 3rd resistance R3；The output pin of described electrical switch is connected with described enable foot, and by the 4th resistance R4 ground connection；In scheduled time t millisecond after system control cpu start powers on, described electrical switch (31) ends, and makes the enable foot of described audio power amplification system keep low level.
As to improvement of the present utility model, described t millisecond selects between 5-20 millisecond.
As to improvement of the present utility model, described electrical switch is audion.
As to improvement of the present utility model, described electrical switch is metal-oxide-semiconductor.
As to improvement of the present utility model, described electrical switch is multiple tube.
The circuit of Pop sound when this simple and practical the improved electronic product that this utility model provides is started shooting, only with a switch element, system just can be made when labile state, ensure that this control level is stable low level, thus reach to remove the purpose of booting moment Pop sound, there is versatility, the debugging efforts of designer can be simplified, increase work efficiency, it is ensured that product quality.This utility model also can simplify circuit structure to greatest extent, reduces development cost, can strengthen product competitiveness.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first embodiment of the present utility model.
Fig. 2 is the structural representation of this utility model the second embodiment.
Fig. 3 is the structural representation of the third embodiment of this utility model.
Fig. 4 is the start waveform configuration schematic diagram that existing electronics produces device.
Detailed description of the invention
In description of the present utility model, it will be appreciated that, in term, orientation or the position relationship of the instruction such as " " center ", " on ", D score, "front", "rear", "left", "right" be based on orientation shown in the drawings or position relationship; be for only for ease of description this utility model and simplifying and describe; rather than instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance.
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " is installed ", " connection ", " being connected " should be interpreted broadly, and connects for example, it may be fixing, it is also possible to is that dismounting connects, or is integrally connected；Can be to be mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be to be indirectly connected to by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can understand that above-mentioned term is at concrete meaning of the present utility model with concrete condition.Additionally, in description of the present utility model, except as otherwise noted, " multiple ", " some " are meant that two or more.
Please join Fig. 1, what Fig. 1 disclosed is the first embodiment of the circuit of a kind of Pop sound improved when electronic product is started shooting, system control cpu 1 and audio power amplification system 2 including electronic product, it is in series with on-off circuit 3 between control end 11 and the enable foot 21 of audio power amplification system 2 of described system control cpu 1, described on-off circuit 3 includes electrical switch 31, the input pin 311 of described electrical switch 31 is connected with described control end 11, and meets feeder ear VDD by the first resistance R1；The assist control foot 312 of described electrical switch 31 is connected with the common port of the second resistance R2 and the 3rd resistance R3, and the other end of described second resistance R2 is connected with described feeder ear VDD, the other end ground connection of described 3rd resistance R3；The output pin 313 of described electrical switch 31 is connected with described enable foot 21, and by the 4th resistance R4 ground connection；In scheduled time t millisecond after system control cpu 1 start powers on, described electrical switch (31) ends, and makes the enable foot 21 of described audio power amplification system 2 keep low level.In the present embodiment, described electrical switch 31 is audion, and wherein, the base stage of audion is input pin, launches extremely assist control foot, current collection extremely output pin.
Please join Fig. 2, what Fig. 2 disclosed is the second embodiment of the circuit of a kind of Pop sound improved when electronic product is started shooting, system control cpu 1 and audio power amplification system 2 including electronic product, it is in series with on-off circuit 3 between control end 11 and the enable foot 21 of audio power amplification system 2 of described system control cpu 1, described on-off circuit 3 includes electrical switch 31, the input pin 311 of described electrical switch 31 is connected with described control end 11, and meets feeder ear VDD by the first resistance R1；The assist control foot 312 of described electrical switch 31 is connected with the common port of the second resistance R2 and the 3rd resistance R3, and the other end of described second resistance R2 is connected with described feeder ear VDD, the other end ground connection of described 3rd resistance R3；The output pin 313 of described electrical switch 31 is connected with described enable foot 21, and by the 4th resistance R4 ground connection；In scheduled time t millisecond after system control cpu 1 start powers on, described electrical switch (31) ends, and makes the enable foot 21 of described audio power amplification system 2 keep low level.In the present embodiment, described electrical switch 31 is metal-oxide-semiconductor, wherein, the G of metal-oxide-semiconductor extremely input pin, the S of metal-oxide-semiconductor extremely assist control foot, the D of metal-oxide-semiconductor extremely output pin.
Please join Fig. 3, what Fig. 3 disclosed is the third embodiment of the circuit of a kind of Pop sound improved when electronic product is started shooting, system control cpu 1 and audio power amplification system 2 including electronic product, it is in series with on-off circuit 3 between control end 11 and the enable foot 21 of audio power amplification system 2 of described system control cpu 1, described on-off circuit 3 includes electrical switch 31, the input pin 311 of described electrical switch 31 is connected with described control end 11, and meets feeder ear VDD by the first resistance R1；The assist control foot 312 of described electrical switch 31 is connected with the common port of the second resistance R2 and the 3rd resistance R3, and the other end of described second resistance R2 is connected with described feeder ear VDD, the other end ground connection of described 3rd resistance R3；The output pin 313 of described electrical switch 31 is connected with described enable foot 21, and by the 4th resistance R4 ground connection；In scheduled time t millisecond after system control cpu 1 start powers on, described electrical switch (31) ends, and makes the enable foot 21 of described audio power amplification system 2 keep low level.In the present embodiment, described electrical switch 31 is multiple tube, it is made up of two NPN type triode inside this multiple tube, wherein, in multiple tube, the base stage of first audion is input pin, the transmitting of second audion extremely assist control foot in multiple tube, the current collection of second audion extremely output pin in multiple tube.
In the various embodiments described above, described t millisecond can select between 5-20 millisecond；The voltage of feeder ear VDD is usually 3.3V；This utility model is suitable on the electronic products such as mobile phone, transmitter receiver, sound system using.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620456490.0U CN205754815U (en) | 2016-05-19 | 2016-05-19 | The circuit of Pop sound during electronic product start can be improved |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620456490.0U CN205754815U (en) | 2016-05-19 | 2016-05-19 | The circuit of Pop sound during electronic product start can be improved |
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| Publication Number | Publication Date |
|---|---|
| CN205754815U true CN205754815U (en) | 2016-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620456490.0U CN205754815U (en) | 2016-05-19 | 2016-05-19 | The circuit of Pop sound during electronic product start can be improved |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106686492A (en) * | 2017-01-22 | 2017-05-17 | 深圳市华星光电技术有限公司 | Audio output circuit and audio device |
-
2016
- 2016-05-19 CN CN201620456490.0U patent/CN205754815U/en active IP Right Grant
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106686492A (en) * | 2017-01-22 | 2017-05-17 | 深圳市华星光电技术有限公司 | Audio output circuit and audio device |
| CN106686492B (en) * | 2017-01-22 | 2019-06-25 | 深圳市华星光电技术有限公司 | A kind of audio output circuit and audio frequency apparatus |
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