CN219780138U - Circuit for improving Bluetooth conversation tone quality - Google Patents
Circuit for improving Bluetooth conversation tone quality Download PDFInfo
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- CN219780138U CN219780138U CN202321012042.8U CN202321012042U CN219780138U CN 219780138 U CN219780138 U CN 219780138U CN 202321012042 U CN202321012042 U CN 202321012042U CN 219780138 U CN219780138 U CN 219780138U
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- 239000003990 capacitor Substances 0.000 claims abstract description 97
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Abstract
The utility model discloses a circuit for improving Bluetooth call tone quality, which is characterized by comprising a Bluetooth chip U1 and a MIC, wherein an MIC AGC chip U5 is connected between the Bluetooth chip U1 and the MIC, and the circuit for improving Bluetooth call tone quality further comprises a resistor R40, a capacitor C41, a capacitor C38, a capacitor C34 and a resistor R33. According to the utility model, by adding one MIC AGC chip MAX9814 and adding a plurality of circuits before the MIC input end of the Bluetooth chip ATS2853 and the output end of the MIC AGC chip MAX9814, the Bluetooth call tone quality and the call distance are improved.
Description
Technical Field
The utility model relates to the technical field of Bluetooth communication, in particular to a circuit for improving the tone quality of Bluetooth communication.
Background
At present, when bluetooth is used for communication, the original circuit of the chip is mainly designed, but if a product with higher quality and longer communication distance is to be designed, the original circuit of the chip can not meet the requirement, and the communication quality is not high.
Disclosure of Invention
The utility model mainly aims to provide a circuit for improving the sound quality of Bluetooth communication, which aims to improve the sound quality of Bluetooth communication.
In order to achieve the above purpose, the utility model provides a circuit for improving the sound quality of a bluetooth call, which comprises a bluetooth chip U1 and a MIC, wherein an MIC AGC chip U5 is connected between the bluetooth chip U1 and the MIC, and the circuit for improving the sound quality of the bluetooth call further comprises a resistor R40, a capacitor C41, a capacitor C38, a capacitor C34 and a resistor R33.
One end of the resistor R40 is connected to the pin 47 of the bluetooth chip U1, the other end of the resistor R40 is connected to the pin 2 of the MIC AGC chip U5, one end of the capacitor C41 is connected to the pin 47 of the bluetooth chip U1 and the pin 5 of the MIC AGC chip U5, the other end of the capacitor C41 is connected to the pin 7 and the pin 15 of the MIC AGC chip U5 and is grounded, one end of the capacitor C38 is connected to the pin 12 of the MIC AGC chip U5, the other end is connected to the pin 11 and the pin 9 of the MIC AGC chip U5 and is grounded, one end of the capacitor C34 is connected to the pin 8 of the MIC AGC chip U5, one end of the resistor R33 is connected to the pin 13 of the MIC AGC chip U5, and the other end of the capacitor C34 is connected to the other end of the resistor R33 and is connected to the input end of the MIC.
According to a further technical scheme of the utility model, the circuit for improving the sound quality of Bluetooth communication further comprises an electric group R27, a resistor R28, a capacitor C37, a capacitor C36 and a capacitor C35, wherein one end of the electric group R27 is connected with the pin 4 of the Bluetooth chip U1, the other end of the electric group R is respectively connected with one ends of the capacitor C37, the capacitor C36 and the resistor R28, the other end of the capacitor C37 is grounded, the other end of the capacitor C36 is connected with the pin 7 of the Bluetooth chip U1, the other end of the resistor R28 is connected with one end of the capacitor C35 and the pin 6 of the MIC AGC chip U5, and the other end of the capacitor C35 is connected with the pin 8 of the Bluetooth chip U1.
According to a further technical scheme, the circuit for improving the sound quality of Bluetooth communication further comprises a capacitor C1, one end of the capacitor C1 is connected with the pin 4 of the Bluetooth chip U1, and the other end of the capacitor C1 is grounded.
The circuit for improving the sound quality of Bluetooth communication has the beneficial effects that:
through the technical proposal, the utility model comprises a Bluetooth chip U1 and a MIC, wherein a MIC AGC chip U5 is connected between the Bluetooth chip U1 and the MIC, the circuit for improving the tone quality of Bluetooth communication also comprises a resistor R40, a capacitor C41, a capacitor C38, a capacitor C34 and a resistor R33, wherein,
one end of the resistor R40 is connected with the pin 47 of the Bluetooth chip U1, the other end of the resistor R40 is connected with the pin 2 of the MIC AGC chip U5, one end of the capacitor C41 is connected with the pin 47 of the Bluetooth chip U1 and the pin 5 of the MIC AGC chip U5, the other end of the capacitor C41 is connected with the pin 7 and the pin 15 of the MIC AGC chip U5 and is grounded, one end of the capacitor C38 is connected with the pin 12 of the MIC AGC chip U5, the other end of the capacitor C38 is connected with the pin 11 and the pin 9 of the MIC AGC chip U5 and is grounded, one end of the capacitor C34 is connected with the pin 8 of the MIC AGC chip U5, one end of the resistor R33 is connected with the pin 13 of the MIC AGC chip U5, and the other end of the capacitor C34 is connected with the other end of the resistor R33 and is connected with the input end of the MIC, so that Bluetooth conversation tone quality and conversation distance are improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of a preferred embodiment of a circuit for improving the tone quality of bluetooth calls according to the present utility model.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
Referring to fig. 1, the present utility model provides a circuit for improving bluetooth call quality, which includes a bluetooth chip U1 and a MIC, wherein a MIC AGC chip U5 is connected between the bluetooth chip U1 and the MIC, and the circuit for improving bluetooth call quality further includes a resistor R40, a capacitor C41, a capacitor C38, a capacitor C34 and a resistor R33.
One end of the resistor R40 is connected to the pin 47 of the bluetooth chip U1, the other end of the resistor R40 is connected to the pin 2 of the MIC AGC chip U5, one end of the capacitor C41 is connected to the pin 47 of the bluetooth chip U1 and the pin 5 of the MIC AGC chip U5, the other end of the capacitor C41 is connected to the pin 7 and the pin 15 of the MIC AGC chip U5 and is grounded, one end of the capacitor C38 is connected to the pin 12 of the MIC AGC chip U5, the other end is connected to the pin 11 and the pin 9 of the MIC AGC chip U5 and is grounded, one end of the capacitor C34 is connected to the pin 8 of the MIC AGC chip U5, one end of the resistor R33 is connected to the pin 13 of the MIC AGC chip U5, and the other end of the capacitor C34 is connected to the other end of the resistor R33 and is connected to the input end of the MIC.
As an implementation manner, in this embodiment, the circuit for improving the sound quality of bluetooth communication further includes an electrical group R27, a resistor R28, a capacitor C37, a capacitor C36 and a capacitor C35, where one end of the electrical group R27 is connected to the pin 4 of the bluetooth chip U1, the other end is respectively connected to one ends of the capacitor C37, the capacitor C36 and the resistor R28, the other end of the capacitor C37 is grounded, the other end of the capacitor C36 is connected to the pin 7 of the bluetooth chip U1, the other end of the resistor R28 is connected to one end of the capacitor C35 and the pin 6 of the MIC AGC chip U5, and the other end of the capacitor C35 is connected to the pin 8 of the bluetooth chip U1.
In this embodiment, the circuit for improving the sound quality of bluetooth communication further includes a capacitor C1, where one end of the capacitor C1 is connected to the pin 4 of the bluetooth chip U1, and the other end is grounded.
The circuit principle of the circuit for improving the sound quality of bluetooth communication according to the present utility model is described in detail below with reference to fig. 1.
In order to solve the requirements of Bluetooth communication on high quality and communication distance, the utility model adds a MIC AGC chip U5 with the model of MAX9814 in front, and adds a plurality of lines between the MIC input end of the Bluetooth chip U1 and the output end of the MIC AGC chip U5 to adjust the whole communication quality, wherein the model of the Bluetooth chip U1 is ATS2853.
In the circuit for improving the sound quality of bluetooth communication shown in fig. 1, the capacitor C1 is a filter capacitor at the end of bluetooth output voltage AVCC, and is given to the resistor R27 and the resistor R28 to be used as bias voltages. The capacitor C37 is a filter capacitor, and the capacitor C37C35 and the capacitor C37C36 are positive and negative coupling capacitors for inputting MIC signals to Bluetooth.
The capacitor C41 is a filter capacitor of the MIC AGC chip U5, the resistor R40 is a work enabling of the MIC AGC chip U5, and the capacitor C38 is a bypass capacitor of the voltage inside the microphone. The resistor R33 provides an operating bias voltage for the M2 capacitor. The capacitor C34 is an alternating-current coupling capacitor output by the M2, and signals are transmitted into the MIC AGC chip U5 for analysis and amplification.
Since the signal requirement of the bluetooth chip U1 MIC is a differential input, the capacitor C37 also has an effect of the negative side signal to ground. Because the MIC AGC chip U5 can amplify the signal on M2 to between 40-60dB, and the DSP inside the bluetooth chip U1 will adjust the echo voltage to the maximum. The line itself has no problem at this time, but the actual call effect is unclear. Therefore, the circuit is adjusted, the R27, the resistor R28, the capacitor C36 and the capacitor C37 are removed from the 4 elements NC, meanwhile, the DSP in the Bluetooth chip U1 is also subjected to differential input, the communication after modification is cleaner, and the remote communication can be heard clearly. I.e. the line is modified to handle the problem.
The circuit for improving the sound quality of Bluetooth communication has the beneficial effects that:
through the technical proposal, the utility model comprises a Bluetooth chip U1 and a MIC, wherein a MIC AGC chip U5 is connected between the Bluetooth chip U1 and the MIC, the circuit for improving the tone quality of Bluetooth communication also comprises a resistor R40, a capacitor C41, a capacitor C38, a capacitor C34 and a resistor R33, wherein,
one end of the resistor R40 is connected with the pin 47 of the Bluetooth chip U1, the other end of the resistor R40 is connected with the pin 2 of the MIC AGC chip U5, one end of the capacitor C41 is connected with the pin 47 of the Bluetooth chip U1 and the pin 5 of the MIC AGC chip U5, the other end of the capacitor C41 is connected with the pin 7 and the pin 15 of the MIC AGC chip U5 and is grounded, one end of the capacitor C38 is connected with the pin 12 of the MIC AGC chip U5, the other end of the capacitor C38 is connected with the pin 11 and the pin 9 of the MIC AGC chip U5 and is grounded, one end of the capacitor C34 is connected with the pin 8 of the MIC AGC chip U5, one end of the resistor R33 is connected with the pin 13 of the MIC AGC chip U5, and the other end of the capacitor C34 is connected with the other end of the resistor R33 and is connected with the input end of the MIC, so that Bluetooth conversation tone quality and conversation distance are improved.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the specification and drawings of the present utility model or direct/indirect application in other related technical fields are included in the scope of the present utility model.
Claims (3)
1. A circuit for improving the sound quality of Bluetooth communication is characterized by comprising a Bluetooth chip U1 and a MIC, wherein an MIC AGC chip U5 is connected between the Bluetooth chip U1 and the MIC, the circuit for improving the sound quality of Bluetooth communication further comprises a resistor R40, a capacitor C41, a capacitor C38, a capacitor C34 and a resistor R33, wherein,
one end of the resistor R40 is connected with the pin 47 of the Bluetooth chip U1, the other end of the resistor R40 is connected with the pin 2 of the MIC AGC chip U5, one end of the capacitor C41 is connected with the pin 47 of the Bluetooth chip U1 and the pin 5 of the MIC AGC chip U5, the other end of the capacitor C41 is connected with the pin 7 and the pin 15 of the MIC AGC chip U5 and is grounded, one end of the capacitor C38 is connected with the pin 12 of the MIC AGC chip U5, the other end of the capacitor C38 is connected with the pin 11 and the pin 9 of the MIC AGC chip U5 and is grounded, one end of the capacitor C34 is connected with the pin 8 of the MIC AGC chip U5, one end of the resistor R33 is connected with the pin 13 of the MIC AGC chip U5, and the other end of the capacitor C34 is connected with the other end of the resistor R33 and is connected with the input end of the MIC.
2. The circuit for improving the sound quality of a bluetooth call according to claim 1, further comprising an electric group R27, a resistor R28, a capacitor C37, a capacitor C36 and a capacitor C35, wherein one end of the electric group R27 is connected to the pin 4 of the bluetooth chip U1, the other end is respectively connected to one end of the capacitor C37, the capacitor C36 and the resistor R28, the other end of the capacitor C37 is grounded, the other end of the capacitor C36 is connected to the pin 7 of the bluetooth chip U1, the other end of the resistor R28 is connected to one end of the capacitor C35 and the pin 6 of the MIC AGC chip U5, and the other end of the capacitor C35 is connected to the pin 8 of the bluetooth chip U1.
3. The circuit for improving the sound quality of a bluetooth call according to claim 2, wherein the circuit for improving the sound quality of a bluetooth call further comprises a capacitor C1, one end of the capacitor C1 is connected to the pin 4 of the bluetooth chip U1, and the other end is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321012042.8U CN219780138U (en) | 2023-04-28 | 2023-04-28 | Circuit for improving Bluetooth conversation tone quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321012042.8U CN219780138U (en) | 2023-04-28 | 2023-04-28 | Circuit for improving Bluetooth conversation tone quality |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219780138U true CN219780138U (en) | 2023-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321012042.8U Active CN219780138U (en) | 2023-04-28 | 2023-04-28 | Circuit for improving Bluetooth conversation tone quality |
Country Status (1)
| Country | Link |
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| CN (1) | CN219780138U (en) |
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2023
- 2023-04-28 CN CN202321012042.8U patent/CN219780138U/en active Active
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