CN205039779U - Circuit of reducible output audio noise - Google Patents
Circuit of reducible output audio noise Download PDFInfo
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- CN205039779U CN205039779U CN201520714882.8U CN201520714882U CN205039779U CN 205039779 U CN205039779 U CN 205039779U CN 201520714882 U CN201520714882 U CN 201520714882U CN 205039779 U CN205039779 U CN 205039779U
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- bluetooth chip
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Abstract
The utility model relates to an audio output controls technical field, especially relates to a circuit of reducible output audio noise. The utility model discloses an in the embodiment, circuit of reducible output audio noise includes bluetooth chip and audio power amplifier module, the difference audio output of bluetooth chip end with the differential input end of audio power amplifier module connects, through connect a noise to reduce the module between the differential input end of audio power amplifier module, can effectively reduce output audio's noise, carry high tone quality.
Description
Technical field
The utility model relates to audio frequency and exports control technology field, particularly relates to a kind of circuit reducing output audio noise.
Background technology
CSR (CambridgeSiliconRadio:CSR) company be one without factory semiconductor maker, its major product is the Bluetooth chip of single-chip, the Bluetooth chip of this series is widely used in bluetooth earphone design, the bluetooth earphone of the Bluetooth chip design utilizing CSR company to produce at present, be limited to the design of its chip, when Bluetooth chip output audio is directly carried out amplification output through external amplifier, the noises such as bad ticktack and Pop can be mixed with in audio frequency, affect tonequality.
Utility model content
The purpose of this utility model is to provide a kind of circuit reducing output audio noise, is intended to solve available circuit and Bluetooth chip output audio directly can be produced noise when external amplifier amplifies, affect the problem of tonequality.
The utility model realizes like this, the utility model provides a kind of circuit reducing output audio noise, comprise Bluetooth chip and audio amplification block, the difference audio output of described Bluetooth chip is connected with the differential input end of described audio amplification block, and the described circuit reducing output audio noise also comprises:
Between the differential input end being connected to described audio amplification block, the noise reducing described Bluetooth chip output audio noise reduces module.
Further, described noise minimizing module comprises the 5th resistance;
The first end of described 5th resistance and the first difference audio frequency output pin of described Bluetooth chip are connected to the first differential input end of described audio amplification block altogether, and the second end of described 5th resistance and the second difference audio frequency output pin of described Bluetooth chip are connected to the second differential input end of described audio amplification block altogether.
Further, described audio amplification block comprises: the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first electric capacity, the second electric capacity and operational amplifier;
The inverting input of described operational amplifier is the first differential input end of described audio amplification block, the in-phase input end of described operational amplifier is the second differential input end of described audio amplification block, second end of described first resistance and the first end of described second resistance are connected to the inverting input of described operational amplifier altogether, the first end of described first resistance connects the first difference output pin of described Bluetooth chip by described first electric capacity, the output of operational amplifier described in second termination of described second resistance, second end of described 3rd resistance and the first end of described 4th resistance are connected to the in-phase input end of described operational amplifier altogether, the first end of described 3rd resistance connects the second difference output pin of described Bluetooth chip by described second electric capacity, second end ground connection of described 4th resistance.
In embodiment of the present utility model, the described circuit reducing output audio noise comprises Bluetooth chip and audio amplification block, the difference audio output of described Bluetooth chip is connected with the differential input end of described audio amplification block, module is reduced by an indirect noise of the differential input end at described audio amplification block, effectively can reduce the noise of output audio, improve tonequality.
Accompanying drawing explanation
Fig. 1 is the module map of the circuit of the reduced output audio noise that the utility model embodiment provides;
Fig. 2 is the circuit diagram of the circuit of the reduced output audio noise that the utility model embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 shows the module map of the circuit of the reduced output audio noise that the utility model embodiment provides.For convenience of explanation, illustrate only the part relevant to the utility model embodiment.
Reduce a circuit for output audio noise, comprise Bluetooth chip 1 and audio amplification block 2, the difference audio output of Bluetooth chip 1 is connected with the differential input end of audio amplification block 2, and the described circuit reducing output audio noise also comprises:
Between the differential input end being connected to audio amplification block 2, the noise reducing Bluetooth chip 1 output audio noise reduces module 3.
Concrete, the Bluetooth chip that Bluetooth chip 1 is produced for CSR company.
Fig. 2 shows the circuit diagram of the circuit of the reduced output audio noise that the utility model embodiment provides.For convenience of explanation, illustrate only the part relevant to the utility model embodiment.
As an embodiment of the present utility model, noise reduces module 3 and comprises the 5th resistance R5;
The first end of the 5th resistance R5 and the first difference audio frequency output pin SPKR-of Bluetooth chip 1 are connected to the first differential input end of audio amplification block 2 altogether, and second end of the 5th resistance R5 and the second difference audio frequency output pin SPKR+ of Bluetooth chip 1 are connected to the second differential input end of audio amplification block 2 altogether.
Further, audio amplification block 2 comprises: the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the first electric capacity C1, the second electric capacity C1 and operational amplifier U1;
The inverting input of operational amplifier U1 is the first differential input end of audio amplification block 2, the in-phase input end of operational amplifier U1 is the second differential input end of audio amplification block 2, second end of the first resistance R1 and the first end of the second resistance R2 are connected to the inverting input of operational amplifier U1 altogether, the first end of the first resistance R1 meets the first difference output pin SPKR-of Bluetooth chip 1 by the first electric capacity C1, the output of the second termination operational amplifier U1 of the second resistance R2, second end of the 3rd resistance R3 and the first end of the 4th resistance R4 are connected to the in-phase input end of operational amplifier U1 altogether, the first end of the 3rd resistance R3 meets the second difference output pin SPKR+ of Bluetooth chip 1 by the second electric capacity C2, the second end ground connection of the 4th resistance R4.
Because what the difference audio output of Bluetooth chip 1 exported is differential signal, differential signal can suppress electromagnetic interference effectively, by the indirect 5th resistance R5 of the difference audio output at Bluetooth chip 1, the audio frequency that difference audio signal exports after audio amplification block 2 amplifies effectively can avoid the generation of noise.As a preferred version of the present utility model, the resistance of the 5th resistance R5 is 100 ohm, and the resistance of the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4 is 10K, and the resistance of the first electric capacity C1 and the second electric capacity C2 is 10 μ F.
In embodiment of the present utility model, the described circuit reducing output audio noise comprises Bluetooth chip and audio amplification block, the difference audio output of described Bluetooth chip is connected with the differential input end of described audio amplification block, module is reduced by an indirect noise of the differential input end at described audio amplification block, effectively can reduce the noise of output audio, improve tonequality.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (3)
1. one kind can be reduced the circuit of output audio noise, comprise Bluetooth chip and audio amplification block, the difference audio output of described Bluetooth chip is connected with the differential input end of described audio amplification block, it is characterized in that, the described circuit reducing output audio noise also comprises:
Between the differential input end being connected to described audio amplification block, the noise reducing described Bluetooth chip output audio noise reduces module.
2. can reduce the circuit of output audio noise as claimed in claim 1, it is characterized in that, described noise reduces module and comprises the 5th resistance;
The first end of described 5th resistance and the first difference audio frequency output pin of described Bluetooth chip are connected to the first differential input end of described audio amplification block altogether, and the second end of described 5th resistance and the second difference audio frequency output pin of described Bluetooth chip are connected to the second differential input end of described audio amplification block altogether.
3. can reduce the circuit of output audio noise as claimed in claim 2, it is characterized in that, described audio amplification block comprises:
First resistance, the second resistance, the 3rd resistance, the 4th resistance, the first electric capacity, the second electric capacity and operational amplifier;
The inverting input of described operational amplifier is the first differential input end of described audio amplification block, the in-phase input end of described operational amplifier is the second differential input end of described audio amplification block, second end of described first resistance and the first end of described second resistance are connected to the inverting input of described operational amplifier altogether, the first end of described first resistance connects the first difference output pin of described Bluetooth chip by described first electric capacity, the output of operational amplifier described in second termination of described second resistance, second end of described 3rd resistance and the first end of described 4th resistance are connected to the in-phase input end of described operational amplifier altogether, the first end of described 3rd resistance connects the second difference output pin of described Bluetooth chip by described second electric capacity, second end ground connection of described 4th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520714882.8U CN205039779U (en) | 2015-09-15 | 2015-09-15 | Circuit of reducible output audio noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520714882.8U CN205039779U (en) | 2015-09-15 | 2015-09-15 | Circuit of reducible output audio noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205039779U true CN205039779U (en) | 2016-02-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520714882.8U Active CN205039779U (en) | 2015-09-15 | 2015-09-15 | Circuit of reducible output audio noise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205039779U (en) |
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2015
- 2015-09-15 CN CN201520714882.8U patent/CN205039779U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Longgang District of Shenzhen City, Guangdong province 518116 Ping Street Takahashi Industrial Park East Area Patentee after: SHENZHE GUANXU ELECTRONIC CO., LTD. Address before: Longgang District of Shenzhen City, Guangdong province 518116 Ping Street Takahashi Industrial Park East Area Patentee before: Shenzhen Grandsun Electronic Co., Ltd. |