CN205378057U - Circuit arrangement who restraines audio signal transmission noise - Google Patents
Circuit arrangement who restraines audio signal transmission noise Download PDFInfo
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- CN205378057U CN205378057U CN201620064918.7U CN201620064918U CN205378057U CN 205378057 U CN205378057 U CN 205378057U CN 201620064918 U CN201620064918 U CN 201620064918U CN 205378057 U CN205378057 U CN 205378057U
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Abstract
The utility model discloses a circuit arrangement who restraines audio signal transmission noise, the host processing chip is the host processing chip in TV or the STB, it includes the power to collect the amplifier impedance converter circuit altogether, first resistance R1, triode Q1 and second resistance R2, the host processing chip passes through the audio output signal line and is connected with triode Q1's base end electricity, triode Q1's the collector terminal first resistance R1 that establishes ties in proper order, a power supply, triode Q1's emitter -base bandgap grading end and second resistance R2 electricity are connected, the filter network circuit includes first electric capacity C1, third resistance R3 and second electric capacity C2, and first electric capacity C1, second electric capacity C2 are parallelly connected each other, and third resistance R3 electricity is connected between first electric capacity C1, second electric capacity C2, the filter network circuit passes through audio signal line electricity communication connection audio output device. The utility model provides a conventional art sound insole make an uproar with the more obvious technical problem of abnormal sound, showing the audio signal line interference killing feature and the noise suppression ability that have strengthened TV or STB core.
Description
Technical field
This utility model relate to suppress audio signal transmission field of noise, particularly relate to a kind of circuit arrangement suppressing audio signal transmission noise, be specially a kind of be used on LCD TV or Set Top Box suppress audio signal transmission noise circuit arrangement.
Background technology
The movement level of integrated system of current liquid crystal TV set or Set Top Box is higher, and mostly adopt the two-in-one design of integrating power supply, audio signal major part within its movement is to adopt analogue signal, audio signal is exported audio power amplifier or sound accompaniment output interface by simple resistance, electric capacity RC network by main process chip, thus completing amplification and the output of sound；
Owing to master chip has tens to hundreds of ohm with audio power amplifier or sound accompaniment output interface resistance to earth, impedance is significantly high, and therebetween be connected audio signal wire another as long, it is highly susceptible to adjacent circuit and the interference of power supply aspect, thus causing the end in power amplifier or port output sound to make an uproar obvious with abnormal sound, particularly volume in evening is easier to hear when opening smaller.Accordingly, RC capacitance-resistance filter network simple on original audio signal wire is carried out redesigning improvement by we, creates the novel circuit device that can effectively suppress noise.
Utility model content
For the weak point that prior art exists, the purpose of this utility model is in that to provide a kind of circuit arrangement suppressing audio signal transmission noise, solve main process chip high with sound accompaniment output device impedance, it is vulnerable to adjacent circuit and power supply disturbance, thus causing the end in power amplifier or port output sound to make an uproar greatly and the problem of abnormal sound.
The purpose of this utility model is achieved through the following technical solutions:
A kind of circuit arrangement suppressing audio signal transmission noise, including the main process chip that telecommunication successively connects, common-collector amplifier impedance inverter circuit, filtering netwok and sound accompaniment output device, described main process chip is the main process chip in TV or Set Top Box, described common-collector amplifier impedance inverter circuit includes power supply, first resistance R1, audion Q1 and the second resistance R2, described main process chip is electrically connected with the base terminal of audion Q1 by audio output signal line, the collector terminal of audion Q1 is sequentially connected in series the first resistance R1, power supply, the emitter-base bandgap grading end of audion Q1 and the second resistance R2 electrical connection；Described filtering netwok includes the first electric capacity C1, the 3rd resistance R3 and the second electric capacity C2, and the first electric capacity C1, the second electric capacity C2 are parallel with one another, and the 3rd resistance R3 is connected electrically between the first electric capacity C1, the second electric capacity C2；Described filtering netwok connects described sound accompaniment output device by audio signal wire telecommunication.
In order to realize this utility model better, wired earth is passed through in one end of described first electric capacity C1.
Further technical scheme is: described audion Q1 is near main process chip, and described 3rd resistance R3 and the second electric capacity C2 is near sound accompaniment output device.
This utility model preferred sound accompaniment output device structure technology scheme is: described sound accompaniment output device is audio power amplifier chip or sound accompaniment output interface.
As preferably, the working power of described power supply is 3.3V～5.0V.
As preferably, it is 0.5K Ω～1K Ω that described audion Q1 penetrates level to earth resistance value (i.e. the second resistance R2).
This utility model compared with the prior art, has the following advantages and beneficial effect:
(1) this utility model adds common-collector amplifier impedance inverter circuit and two circuit structures of filtering netwok between main process chip and sound accompaniment output device, impedance transformation is carried out by two circuit structures, to be reduced to audio power amplifier chip or sound accompaniment output interface segment signal line impedence, and mate proper resistor and capacitor filter network, thus significantly reducing the defect that audio signal wire is easily disturbed, reach suppression system and power supply noise, export the purpose of pure audio signal.
(2) this utility model solves the technical problem that make an uproar in the end in conventional art sound and abnormal sound is obvious, significantly enhances audio signal wire capacity of resisting disturbance and the noise inhibiting ability of TV or cassette mechanism of set-top box.
Accompanying drawing explanation
Fig. 1 is theory structure block diagram of the present utility model；
Fig. 2 is circuit diagram of the present utility model.
Wherein, the name corresponding to accompanying drawing labelling in accompanying drawing is called:
The main process chip of 1-, 2-common-collector amplifier impedance inverter circuit, 21-power supply, 3-filtering netwok, 4-sound accompaniment output device.
Detailed description of the invention
Below in conjunction with embodiment, this utility model is described in further detail:
Embodiment
As shown in Fig. 1～Fig. 2, a kind of circuit arrangement suppressing audio signal transmission noise, including the main process chip 1 that telecommunication successively connects, common-collector amplifier impedance inverter circuit 2, filtering netwok 3 and sound accompaniment output device 4, main process chip 1 is the main process chip in TV or Set Top Box, common-collector amplifier impedance inverter circuit 2 includes power supply 21, first resistance R1, audion Q1 and the second resistance R2, main process chip 1 is electrically connected with the base terminal of audion Q1 by audio output signal line, the collector terminal of audion Q1 is sequentially connected in series the first resistance R1, power supply 21, the emitter-base bandgap grading end of audion Q1 and the second resistance R2 electrical connection.Filtering netwok 3 includes the first electric capacity C1, the 3rd resistance R3 and the second electric capacity C2, and the first electric capacity C1, the second electric capacity C2 are parallel with one another, and the 3rd resistance R3 is connected electrically between the first electric capacity C1, the second electric capacity C2.Filtering netwok 3 connects sound accompaniment output device 4 by audio signal wire telecommunication, sound accompaniment output device 4 is audio power amplifier chip or sound accompaniment output interface, when main process chip 1 is TV time, sound accompaniment output device 4 just corresponds to audio power amplifier chip (audio power amplifier chip directly amplifies) for TV；When main process chip 1 is Set Top Box time, sound accompaniment output device 4 just corresponds to sound accompaniment output interface, and acoustic information is transported in other equipment by Set Top Box by sound accompaniment output interface.
According to an embodiment of the present utility model, wired earth is passed through in one end of the first electric capacity C1.
According to an embodiment of the present utility model, audion Q1 is near main process chip 1, and namely the audio output signal line between audion Q1 and main process chip 1 is as far as possible short；3rd resistance R3 and the second electric capacity C2 is near sound accompaniment output device 4.
According to an embodiment of the present utility model, the working power of power supply 21 is 3.3V～5.0V.
According to an embodiment of the present utility model, it is 0.5K Ω～1K Ω that audion Q1 penetrates level to earth resistance value (i.e. the second resistance R2).
This utility model mainly solves main process chip 1 technical problem that make an uproar in the end and abnormal sound is obvious in output sound between audio power amplifier chip or sound accompaniment output interface (being referred to as sound accompaniment output device 4) of LCD TV or Set Top Box, common-collector amplifier impedance inverter circuit 2 is increased at main process chip 1 signal output part near LCD TV or Set Top Box, filtering netwok 3 circuit such as grade, carry out impedance transformation, to be reduced to audio power amplifier chip or sound accompaniment output interface segment signal line impedence, and mate proper resistor and capacitor filter network, thus significantly reducing the defect that audio signal wire is easily disturbed, reach suppression system and power supply noise, export the purpose of pure audio signal.
Operation principle of the present utility model is as follows:
nullWhen after TV or Set Top Box normal operation，The audio signal of main process chip 1 exports the base stage of the audion Q1 in common-collector amplifier impedance inverter circuit 2，Ensureing this segment signal line, as far as possible short (audion Q1 is near main process chip 1，Audio output signal line between audion Q1 and main process chip 1 is as far as possible short)，Signal exports from the emitter-base bandgap grading end of audion Q1，After the impedance transformation of common-collector amplifier，Holding wire DC impedance significantly reduces，Basic with R2 resistance，Owing to impedance reduces，The capacity of resisting disturbance of whole holding wire is obviously improved，Then through C1、R3、π type filter network (i.e. filtering netwok 3) of C2 composition，Wherein R3、C2 should close proximity to receiving terminal，Thus centering、High-frequency Interference suppresses further，So that the audio signal of output audio power amplifier chip or sound accompaniment output interface only has pure audio signal.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent replacement and improvement etc. made within spirit of the present utility model and principle, should be included within protection domain of the present utility model.
Claims (6)
1. the circuit arrangement suppressing audio signal transmission noise, it is characterized in that: include the main process chip (1) that telecommunication connects successively, common-collector amplifier impedance inverter circuit (2), filtering netwok (3) and sound accompaniment output device (4), described main process chip (1) is the main process chip in TV or Set Top Box, described common-collector amplifier impedance inverter circuit (2) includes power supply (21), first resistance (R1), audion (Q1) and the second resistance (R2), described main process chip (1) is electrically connected by the base terminal of audio output signal line with audion (Q1), the collector terminal of audion (Q1) is sequentially connected in series the first resistance (R1), power supply (21), the emitter-base bandgap grading end of audion (Q1) and the second resistance (R2) electrical connection；Described filtering netwok (3) includes the first electric capacity (C1), the 3rd resistance (R3) and the second electric capacity (C2), first electric capacity (C1), the second electric capacity (C2) are parallel with one another, and the 3rd resistance (R3) is connected electrically between the first electric capacity (C1), the second electric capacity (C2)；Described filtering netwok (3) connects described sound accompaniment output device (4) by audio signal wire telecommunication.
2. a kind of circuit arrangement suppressing audio signal transmission noise described in claim 1, it is characterised in that: wired earth is passed through in one end of described first electric capacity (C1).
3. a kind of circuit arrangement suppressing audio signal transmission noise described in claim 1, it is characterized in that: described audion (Q1) is near the close sound accompaniment output device (4) of main process chip (1), described 3rd resistance (R3) and the second electric capacity (C2).
4. a kind of circuit arrangement suppressing audio signal transmission noise described in claim 1 or 3, it is characterised in that: described sound accompaniment output device (4) is audio power amplifier chip or sound accompaniment output interface.
5. a kind of circuit arrangement suppressing audio signal transmission noise described in claim 1, it is characterised in that: the working power of described power supply (21) is 3.3V～5.0V.
6. a kind of circuit arrangement suppressing audio signal transmission noise described in claim 1 or 3, it is characterised in that: it is 0.5K Ω～1K Ω that described audion (Q1) penetrates level to earth resistance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620064918.7U CN205378057U (en) | 2016-01-22 | 2016-01-22 | Circuit arrangement who restraines audio signal transmission noise |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620064918.7U CN205378057U (en) | 2016-01-22 | 2016-01-22 | Circuit arrangement who restraines audio signal transmission noise |
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| Publication Number | Publication Date |
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| CN205378057U true CN205378057U (en) | 2016-07-06 |
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| CN201620064918.7U Active CN205378057U (en) | 2016-01-22 | 2016-01-22 | Circuit arrangement who restraines audio signal transmission noise |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106981974A (en) * | 2017-04-05 | 2017-07-25 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle power interface circuit for suppressing engine noise |
| CN107837450A (en) * | 2017-11-23 | 2018-03-27 | 深圳佳莱知家科技有限公司 | A kind of intelligent tuning sleep guidance control system |
| CN113873089A (en) * | 2020-06-30 | 2021-12-31 | 华为技术有限公司 | Method and device for reducing noise |
-
2016
- 2016-01-22 CN CN201620064918.7U patent/CN205378057U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106981974A (en) * | 2017-04-05 | 2017-07-25 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle power interface circuit for suppressing engine noise |
| CN107837450A (en) * | 2017-11-23 | 2018-03-27 | 深圳佳莱知家科技有限公司 | A kind of intelligent tuning sleep guidance control system |
| CN113873089A (en) * | 2020-06-30 | 2021-12-31 | 华为技术有限公司 | Method and device for reducing noise |
| CN113873089B (en) * | 2020-06-30 | 2022-09-23 | 华为技术有限公司 | Method and device for reducing noise |
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