CN215871819U - Input selection circuit, circuit board and conference sound box - Google Patents
Input selection circuit, circuit board and conference sound box Download PDFInfo
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- CN215871819U CN215871819U CN202121778810.1U CN202121778810U CN215871819U CN 215871819 U CN215871819 U CN 215871819U CN 202121778810 U CN202121778810 U CN 202121778810U CN 215871819 U CN215871819 U CN 215871819U
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Abstract
The utility model relates to the technical field of conference sound box equipment, in particular to an input selection circuit, which comprises: DSP module, bluetooth module, DAC module and analog switch U8, the output of DSP module with bluetooth module's output all with analog switch U8's input is connected, analog switch U8's output with the input of DAC module is connected, analog switch U8's controlled end is used for receiving CPU or bluetooth module's control signal. The utility model also provides a circuit board and a conference sound box. The Bluetooth audio playing signal of the Bluetooth module is conducted through the analog switch U8 and is transmitted to the DAC module, the process does not need to be processed by a DSP chip, and the information processing amount of the DSP chip can be reduced.
Description
Technical Field
The utility model relates to the technical field of conference sound box equipment, in particular to an input selection circuit, a circuit board and a conference sound box.
Background
Conference speakers generally have both a voice call function and a bluetooth music playing function. The Bluetooth Digital signal is processed by a Digital Signal Processing (DSP) module, demodulated into an analog signal by a Digital to analog converter (DAC) module and provided for a rear-stage power amplifier, and finally the sound is restored by a loudspeaker.
In the existing conference audio box, a call voice signal and a Bluetooth audio playing signal are processed by a DSP chip, and the task processing amount of the DSP chip is very heavy, so that the working efficiency is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, it is a primary object of the present invention to provide an input selection circuit, in which a bluetooth audio playing signal of the input selection circuit does not need to be processed by a DSP chip, so that the information processing amount of the DSP chip can be reduced.
In order to achieve the purpose, the utility model adopts the technical scheme that:
an input selection circuit, comprising: DSP module, bluetooth module, DAC module and analog switch U8, the output of DSP module with bluetooth module's output all with analog switch U8's input is connected, analog switch U8's output with the input of DAC module is connected, analog switch U8's controlled end is used for receiving CPU or bluetooth module's control signal.
Further, analog switch U8 is equipped with 6 pins, analog switch U8's first input pin with the output of DSP module is connected, analog switch U8's GND pin ground, analog switch U8's second input pin with bluetooth module's output is connected, analog switch U8's output pin with the input of DAC module is connected, 3.3V voltage is connected to analog switch U8's VCC pin, analog switch U8's ENB pin is connected bluetooth module's signal control end.
Furthermore, the input selection circuit comprises a power amplifier module and a loudspeaker, and the output end of the DAC module is connected with the loudspeaker through the power amplifier module.
Further, the DAC module includes a digital-to-analog conversion chip U10, an input terminal of the digital-to-analog conversion chip U10 is connected to an output pin of the analog switch U8, and an output terminal of the digital-to-analog conversion chip U10 is connected to the power amplifier module.
Further, the model of the analog switch U8 is TSXXXXXXX, and the model of the digital-to-analog conversion chip U10 is ESXXXXX.
Further, the input selection circuit comprises a resistor RS4, a resistor RS5 and a capacitor CP1, an AOUTRN pin of the digital-to-analog conversion chip U10 is connected with one end of the capacitor CP1 through the resistor RS5, and an AOUTRN pin of the digital-to-analog conversion chip U10 is connected with the other end of the capacitor CP1 through the resistor RS 4.
Further, a capacitor C73 is connected to a VCC pin of the analog switch U8, and one end of the capacitor C73 is grounded.
Further, the DSP module comprises a DSP chip, and the model of the DSP chip is DBXXX.
The present invention also provides a circuit board comprising an input selection circuit as described above.
The utility model also provides a conference sound box which comprises the circuit board.
The utility model has the beneficial effects that:
the present invention comprises: the Bluetooth module is connected with the DAC module through an analog switch U8; the Bluetooth audio playing signal is conducted through the analog switch U8 and is transmitted to the DAC module, the process does not need to be processed through a DSP chip, and the information processing amount of the DSP chip can be reduced.
Drawings
FIG. 1 is a schematic diagram of an input selection circuit according to the present invention.
Fig. 2 is a circuit diagram of the analog switch U8 of the present invention.
Detailed Description
Referring to fig. 1-2, an embodiment of the utility model discloses an input selection circuit, including: DSP module, bluetooth module, DAC module and analog switch U8, the output of DSP module with bluetooth module's output all with analog switch U8's input is connected, analog switch U8's output with the input of DAC module is connected, analog switch U8's controlled end is used for receiving CPU or bluetooth module's control signal.
The working principle is as follows:
in a call use scene of a conference sound box, a signal control end of a CPU or a Bluetooth module outputs a high level to a controlled end of the analog switch U8, so that the analog switch U8 is connected with a circuit where a DSP module is located, and voice data on the DSP module reaches a DAC module after passing through the analog switch U8;
when the conference sound box does not need to carry out communication, a signal control end of the CPU or the Bluetooth module outputs a low level to a controlled end of the analog switch U8, so that the analog switch U8 is connected with a circuit where the Bluetooth module is located, and Bluetooth audio data on the Bluetooth module reaches the DAC module after passing through the analog switch U8;
namely, the intelligent selection input line of the conference sound box can be realized by controlling the high and low levels of the controlled end of the analog switch U8.
It should be noted that, the utility model designs the call voice signal for the DSP module to process, and the Bluetooth audio signal/pure playing scene does not need to be processed by the DSP module; the information processing amount of the DSP module can be reduced, the design is optimized, the task processing is clear, and the working efficiency is improved.
Further, the analog switch U8 has 6 pins, a first input pin of the analog switch U8 (i.e., the a1 pin of the analog switch U8) is connected to the output terminal of the DSP module, the GND pin of the analog switch U8 is connected to ground, a second input pin of the analog switch U8 (i.e., the a2 pin of the analog switch U8) is connected to the output terminal of the bluetooth module, an output pin of the analog switch U8 (i.e., the B pin of the analog switch U8) is connected to the input terminal of the DAC module, the VCC pin of the analog switch U8 is connected to a 3.3V voltage, and the ENB pin of the analog switch U8 is connected to the signal control terminal of the bluetooth module;
in the scheme, the ENB pin of the analog switch U8 is used as the controlled end of the analog switch U8.
Furthermore, the input selection circuit comprises a power amplifier module and a loudspeaker, and the output end of the DAC module is connected with the loudspeaker through the power amplifier module.
Further, the DAC module includes a digital-to-analog conversion chip U10, an input terminal of the digital-to-analog conversion chip U10 (i.e., SDATA pin of the digital-to-analog conversion chip U10) is connected to an output pin of the analog switch U8, and an output terminal of the digital-to-analog conversion chip U10 is connected to the power amplifier module.
Furthermore, the model of the analog switch U8 is TSXXXXXXX, and the model of the digital-to-analog conversion chip U10 is ESXXXXX.
Further, the input selection circuit comprises a resistor RS4, a resistor RS5 and a capacitor CP1, wherein an AOUTRN pin of the digital-to-analog conversion chip U10 is connected with one end of the capacitor CP1 through the resistor RS5, and an AOUTRN pin of the digital-to-analog conversion chip U10 is connected with the other end of the capacitor CP1 through the resistor RS 4;
in the above scheme, the AOUTRN pin and the AOUTRP pin of the digital-to-analog conversion chip U10 are used as the output terminal of the digital-to-analog conversion chip U10.
Further, a capacitor C73 is connected to a VCC pin of the analog switch U8, and one end of the capacitor C73 is grounded.
Further, the DSP module comprises a DSP chip, and the model of the DSP chip is DBXXX.
The present invention also provides a circuit board comprising an input selection circuit as described above.
The utility model also provides a conference sound box which comprises the circuit board.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.
Claims (10)
1. An input selection circuit, comprising: DSP module, bluetooth module, DAC module and analog switch U8, the output of DSP module with bluetooth module's output all with analog switch U8's input is connected, analog switch U8's output with the input of DAC module is connected, analog switch U8's controlled end is used for receiving CPU or bluetooth module's control signal.
2. An input selection circuit as claimed in claim 1, wherein: analog switch U8's first input pin with the output of DSP module is connected, analog switch U8's GND pin ground, analog switch U8's second input pin with bluetooth module's output is connected, analog switch U8's output pin with the input of DAC module is connected, 3.3V voltage is connected to analog switch U8's VCC pin, analog switch U8's ENB pin is connected bluetooth module's signal control end.
3. An input selection circuit as claimed in claim 2, wherein: the input selection circuit comprises a power amplifier module and a loudspeaker, and the output end of the DAC module is connected with the loudspeaker through the power amplifier module.
4. An input selection circuit as claimed in claim 3, wherein: the DAC module comprises a digital-to-analog conversion chip U10, the input end of the digital-to-analog conversion chip U10 is connected with the output pin of the analog switch U8, and the output end of the digital-to-analog conversion chip U10 is connected with the power amplifier module.
5. An input selection circuit as claimed in claim 4, wherein: the model of the analog switch U8 is TSXXXXXXX, and the model of the digital-to-analog conversion chip U10 is ESXXXXX.
6. An input selection circuit as claimed in claim 5, wherein: the input selection circuit comprises a resistor RS4, a resistor RS5 and a capacitor CP1, wherein an AOUTRN pin of the digital-to-analog conversion chip U10 is connected with one end of the capacitor CP1 through the resistor RS5, and an AOUTRN pin of the digital-to-analog conversion chip U10 is connected with the other end of the capacitor CP1 through the resistor RS 4.
7. An input selection circuit as claimed in claim 2, wherein: the VCC pin of the analog switch U8 is connected with a capacitor C73, and one end of the capacitor C73 is grounded.
8. An input selection circuit as claimed in claim 2, wherein: the DSP module comprises a DSP chip, and the model of the DSP chip is DBXXX.
9. A circuit board, characterized by: the circuit board comprising an input selection circuit as claimed in any one of claims 1-8.
10. A conference sound box is characterized in that: the conference sound box comprises the circuit board of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121778810.1U CN215871819U (en) | 2021-07-30 | 2021-07-30 | Input selection circuit, circuit board and conference sound box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121778810.1U CN215871819U (en) | 2021-07-30 | 2021-07-30 | Input selection circuit, circuit board and conference sound box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215871819U true CN215871819U (en) | 2022-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121778810.1U Active CN215871819U (en) | 2021-07-30 | 2021-07-30 | Input selection circuit, circuit board and conference sound box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215871819U (en) |
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2021
- 2021-07-30 CN CN202121778810.1U patent/CN215871819U/en active Active
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