CN213844114U

CN213844114U - Board carries sound card audio circuit and computer

Info

Publication number: CN213844114U
Application number: CN202022782950.8U
Authority: CN
Inventors: 丁永波; 李优斌
Original assignee: Shenzhen Weibu Information Co Ltd
Current assignee: Shenzhen Weibu Information Co Ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-07-30
Anticipated expiration: 2030-11-26

Abstract

The embodiment of the utility model discloses a board carries sound card audio circuit and computer, board carries sound card audio circuit includes audio processing module, input module and output module; the audio processing module is connected with the input module, the output module, the processor and the left and right sound channel sound boxes; the output module is externally connected with an earphone or a sound box; the audio processing module decodes and samples the digital audio signals transmitted by the processor, and converts the digital audio signals into analog audio signals to the output module; the analog audio signals are amplified and then output to the left and right sound channel sound boxes for playing; the output module outputs an analog audio signal to drive an external earphone or a sound box to sound; the input module receives the microphone signal and transmits the microphone signal to the audio processing module, and the audio processing module carries out audio processing on the microphone signal and then outputs the microphone signal to the processor. Through the compatible power amplifier function of an audio processing module, need not to set up power amplifier module alone, the circuit is simple and it is little to occupy the PCB space.

Description

Board carries sound card audio circuit and computer

Technical Field

The utility model relates to the field of electronic technology, especially, relate to a board carries sound card audio circuit and computer.

Background

The audio circuit of the existing commonly used mainboard on-board sound card adopts an external power amplifier mode, transmits left and right sound channel sound source signals output by an audio decoding chip to the power amplifier chip, outputs left and right sound channel signals to a loudspeaker (Speaker) output interface after the audio decoding chip is converted and amplified, and drives sound boxes of left and right sound channels to sound. Because an external power amplifier chip is needed for conversion and amplification, the circuit is complicated, and the Layout and Debug maintenance of an engineer are inconvenient; and the number of parts is large, the occupied space of a PCB (printed circuit boards) board is large, the research and development cost and the production cost are high, the performance is stable, and the safety is relatively low.

SUMMERY OF THE UTILITY MODEL

To the above technical problem, the embodiment of the utility model provides a board carries sound card audio circuit and computer to solve current audio circuit and adopt independent power amplifier chip to lead to the more complicated problem of circuit.

The embodiment of the utility model provides a board carries sound card audio circuit, connects treater and left and right sound channel audio amplifier, and it includes audio processing module, input module and output module; the audio processing module is connected with the input module, the output module, the processor and the left and right sound channel sound boxes; the output module is externally connected with an earphone or a sound box;

the audio processing module decodes and samples the digital audio signals transmitted by the processor, and converts the digital audio signals into analog audio signals to the output module; the analog audio signals are amplified and then output to the left and right sound channel sound boxes for playing;

the output module outputs an analog audio signal to drive an external earphone or a sound box to sound;

the input module receives the microphone signal and transmits the microphone signal to the audio processing module, and the audio processing module carries out audio processing on the microphone signal and then outputs the microphone signal to the processor.

Optionally, in the on-board sound card audio circuit, the audio processing module includes an audio decoding chip, a first switch tube, a second switch tube, a first resistor, a second resistor, a first magnetic bead, a second magnetic bead, a third magnetic bead, a first capacitor, and a speaker interface;

the AVDD2 pin of the audio decoding chip is connected with one end of a first magnetic bead and the AVDD1 pin of the audio decoding chip, the other end of the first magnetic bead is connected with a second power supply end, the PVDD1 pin of the audio decoding chip is connected with the second power supply end through the second magnetic bead, and the PVDD2 pin of the audio decoding chip is connected with the second power supply end through a third magnetic bead; the SPK _ L + pin, the SPK _ L-pin, the SPK _ R-pin and the SPK _ R + pin of the audio decoding chip are connected with the L + pin, the L-pin, the R-pin and the R + pin of the loudspeaker interface in a one-to-one manner; the DVDD1 pin and the DVDD _ IO pin of the audio decoding chip are both connected with a first power supply end; the PD # pin of the audio decoding chip is connected with the second power supply end and the drain electrode of the second switching tube; the grid electrode of the second switching tube is connected with the drain electrode and the third power supply end of the first switching tube, and the grid electrode of the first switching tube is connected with the HDA _ RST # pin of the processor; the source electrode of the first switch tube and the source electrode of the second switch tube are both grounded; the SDATA _ OUT pin, the BIT _ CLK pin, the SDATA _ IN pin, the SYNC pin and the RESET # pin of the audio decoding chip are connected with the HDA _ SDO pin, the HDA _ BCLK pin, the HDA _ SDI0 pin, the HDA _ SYNC pin and the HDA _ RST # pin of the processor IN a one-to-one mode; a Sense A pin of the audio decoding chip is connected with one end of a first resistor and one end of a second resistor, the other end of the first resistor is connected with an output module, and the other end of the second resistor is connected with an input module; the MIC1_ L pin, the MIC1_ R pin, the MIC1_ VREFO _ R pin and the MIC1_ VREFO _ L pin of the audio decoding chip are all connected with the input module; the HP _ OUT _ L pin and the HP _ OUT _ R pin of the audio decoding chip are both connected with the output module, the CBN pin of the audio decoding chip is connected with the CBP pin of the audio decoding chip through a first capacitor, and the AVSS1 pin, the AVSS2 pin, the PVSS1 pin, the PVSS2 pin, the DVSS2 pin, the GND _ PAD pin and the JDREF pin of the audio decoding chip are all grounded.

Optionally, in the on-board sound card audio circuit, the audio processing module further includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a second capacitor;

one end of the third resistor is connected with a PD # pin of the audio decoding chip, the drain electrode of the second switching tube and one end of the fourth resistor; the other end of the fourth resistor is grounded, the other end of the third resistor is connected with the second power supply end, one end of the fifth resistor is connected with the grid electrode of the second switching tube and the drain electrode of the first switching tube, the other end of the fifth resistor is connected with the third power supply end, and one end of the sixth resistor is connected with one end of the seventh resistor, one end of the second capacitor and the grid electrode of the first switching tube; the other end of the seventh resistor is connected with the HDA _ RST # pin of the processor, and the other end of the sixth resistor is connected with the other end of the second capacitor and the ground.

Optionally, in the on-board sound card audio circuit, the input module includes a microphone input interface, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third capacitor, and a fourth capacitor;

a 5 th pin of the microphone input interface is connected with one end of a ninth resistor, one end of an eleventh resistor and one end of a fourth capacitor; the 6 th pin of the microphone input interface is connected with one end of an eighth resistor, one end of a tenth resistor and one end of a third capacitor, the other end of the tenth resistor is connected with the other end of an eleventh resistor and the ground, the other end of the eighth resistor is connected with the MIC1_ VREFO _ R pin of the audio decoding chip, the other end of the ninth resistor is connected with the MIC1_ VREFO _ L pin of the audio decoding chip, the other end of the third capacitor is connected with the MIC1_ R pin of the audio decoding chip, the other end of the fourth capacitor is connected with the MIC1_ L pin of the audio decoding chip, the 4 th pin of the microphone input interface is connected with the other end of the second resistor, and the 3 rd pin and the ground 7 pin of the microphone input interface are grounded.

Optionally, in the on-board sound card audio circuit, the output module includes an analog audio output interface, a twelfth resistor, a thirteenth resistor, a fifth capacitor, and a sixth capacitor;

the analog audio output interface is externally connected with a microphone, and a 5 th pin of the analog audio output interface is connected with one end of a thirteenth resistor and one end of a sixth capacitor; the 6 th pin of the analog audio output interface is connected with one end of a twelfth resistor and one end of a fifth capacitor, the other end of the twelfth resistor is connected with the other end of a thirteenth resistor and the ground, the other end of the fifth capacitor is connected with the HP _ OUT _ R pin of the audio decoding chip, the other end of the sixth capacitor is connected with the HP _ OUT _ L pin of the audio decoding chip, the 4 th pin of the analog audio output interface is connected with the other end of the first resistor, and the 3 rd pin of the analog audio output interface and the 7 th pin of the ground are grounded.

Optionally, in the on-board sound card audio circuit, the JDREF pin of the audio decoding chip is grounded through a resistor.

Optionally, in the on-board sound card audio circuit, a CPVEE pin and an LDO _ CAP pin of the audio decoding chip are grounded through a capacitor, respectively.

A second aspect of the embodiment of the present invention provides a computer, which includes a motherboard, wherein the motherboard is provided with a processor, left and right sound channel speakers, and the motherboard is further provided with the onboard sound card audio circuit, and the onboard sound card audio circuit is connected with the processor and the left and right sound channel speakers;

the processor outputs audio signals to be played to an onboard sound card audio circuit, and the onboard sound card audio circuit decodes, converts and amplifies digital audio signals and outputs the digital audio signals to the left and right sound channel sound boxes to drive the left and right sound channel sound boxes to play; and the converted digital audio signal is output to an external earphone or a sound box for playing.

In the technical scheme provided by the embodiment of the utility model, the onboard sound card audio circuit comprises an audio processing module, an input module and an output module; the audio processing module is connected with the input module, the output module, the processor and the left and right sound channel sound boxes; the output module is externally connected with an earphone or a sound box; the audio processing module decodes and samples the digital audio signals transmitted by the processor, and converts the digital audio signals into analog audio signals to the output module; the analog audio signals are amplified and then output to the left and right sound channel sound boxes for playing; the output module outputs an analog audio signal to drive an external earphone or a sound box to sound; the input module receives the microphone signal and transmits the microphone signal to the audio processing module, and the audio processing module carries out audio processing on the microphone signal and then outputs the microphone signal to the processor. Through the audio processing module, the functions of decoding, analog-to-digital conversion, digital-to-analog conversion, power amplification, audio processing and the like are compatible, the power amplification module does not need to be arranged independently, the circuit is simple, and the occupied space of a PCB is small. Therefore, the problem that the existing audio circuit adopts an independent power amplifier chip to cause a complex circuit is solved.

Drawings

Fig. 1 is a block diagram of a computer according to an embodiment of the present invention.

Fig. 2 is a schematic circuit diagram of an audio processing module according to an embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of a processor according to an embodiment of the present invention.

Fig. 4 is a schematic circuit diagram of an input module according to an embodiment of the present invention.

Fig. 5 is a schematic circuit diagram of an output module according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts, belong to the protection scope of the present invention.

Referring to fig. 1, a computer (such as a notebook computer or a tablet computer) provided in an embodiment of the present invention includes a main board, on which an on-board sound card audio circuit 10, a processor 20, and left and right sound channel speakers 30 are disposed; the on-board sound card audio circuit 10 is connected to the processor 20 and the left and right channel speakers 30. When the computer plays an audio file, the processor 20 outputs an audio signal to be played to the onboard sound card audio circuit 10, and the onboard sound card audio circuit 10 decodes, performs digital-to-analog conversion and amplification on the digital audio signal, outputs the digital audio signal to the left and right sound channel speakers 30, and drives the left and right sound channel speakers 30 to play.

The on-board sound card audio circuit 10 may further be connected to a microphone and an earphone (or a sound box), receives a microphone signal collected by the microphone, performs audio processing (such as noise reduction), and outputs a voice audio signal to the processor 20, and the voice audio signal is transmitted to a communicating party through the communication module after the processing (such as format conversion) by the processor 20; the processor 20 converts the voice signal received by the communication module into an audio signal and transmits the audio signal to the on-board sound card audio circuit 10, and the on-board sound card audio circuit 10 converts the digital audio signal and outputs the converted signal to an earphone or a sound box for playing. This is the conventional call function and will not be described in detail here.

In this embodiment, as shown in fig. 3, the processor 20 is preferably a CPU with a model J1900, only pins for transmitting audio signals and voice audio signals related to this embodiment are described herein, the related pins of the processor 20 are connected to the on-board sound card audio circuit 10 through a resistor RN, and other pins are related to the prior art and are not described herein again; some motherboards are also provided with south bridge chips (preferably, models H310C and B360), and the on-board sound card audio circuit 10 can also communicate with the south bridge chips to transmit audio signals. The model is not limited as long as the audio signal can be transmitted. The left and right sound channel sound boxes 30 are built-in sound boxes, and in specific implementation, they can also be external sound boxes, and the onboard sound card audio circuit 10 is connected with the left and right sound channel sound boxes through data lines.

The on-board sound card audio circuit 10 includes an audio processing module 110, an input module 120, and an output module 130; the audio processing module 110 is connected to the input module 120, the output module 130, the processor 20, and the left and right sound channel speakers 30, and the output module 130 is externally connected to an earphone or a speaker. The audio processing module 110 decodes and samples the digital audio signal transmitted by the processor 20, converts the digital audio signal into an analog audio signal, and transmits the analog audio signal to the output module 130, and the output module 130 outputs the analog audio signal to drive an external earphone or a sound box to sound; the audio processing module 110 further amplifies the analog audio signal and outputs a left and right sound channel signal to the left and right sound channel speakers 30 for playing; the input module 120 receives a microphone signal collected by a microphone and transmits the microphone signal to the audio processing module 110, and the audio processing module 110 performs audio processing on the microphone signal and outputs the processed microphone signal to the processor.

Through the audio processing module 110, functions of decoding, analog-to-digital conversion, digital-to-analog conversion, power amplification, audio processing and the like are compatible, the power amplification module does not need to be arranged independently, the circuit is simple, and the occupied space of a PCB is small.

Referring to fig. 2 and 3, in the present embodiment, a ground composed of 4 lines arranged from top to bottom is a digital ground, and a triangle represents an analog ground. The audio processing module 110 comprises an audio decoding chip U1, a first switch tube Q1, a second switch tube Q2, a first resistor R1, a second resistor R2, a first magnetic bead FB1, a second magnetic bead FB2, a third magnetic bead FB3, a first capacitor C1 and a speaker interface SPK; an AVDD2 pin of the audio decoding chip U1 is connected with one end of a first magnetic bead FB1 and an AVDD1 pin of the audio decoding chip U1, the other end of the first magnetic bead FB1 is connected with a second power supply end (inputting a second voltage +5VS), a PVDD1 pin of the audio decoding chip U1 is connected with the second power supply end through the second magnetic bead FB2, and a PVDD2 pin of the audio decoding chip U1 is connected with the second power supply end through a third magnetic bead FB 3; the SPK _ L + pin, the SPK _ L-pin, the SPK _ R-pin and the SPK _ R + pin of the audio decoding chip U1 are connected with the L + pin, the L-pin, the R-pin and the R + pin of the speaker interface SPK in a one-to-one manner; a DVDD1 pin and a DVDD _ IO pin of the audio decoding chip U1 are both connected with a first power supply end (inputting a first voltage of +3 VS); the PD # pin of the audio decoding chip U1 is connected with the second power supply end and the drain electrode of the second switch tube Q2; the gate of the second switch Q2 is connected to the drain of the first switch Q1 and the third power supply terminal (input the third voltage +5VSB), and the gate of the first switch Q1 is connected to the HDA _ RST # pin of the processor 20 (providing the reset signal AC _ RST); the source electrode of the first switch tube Q1 and the source electrode of the second switch tube Q2 are both grounded; the SDATA _ OUT pin, the BIT _ CLK pin, the SDATA _ IN pin, the SYNC pin and the RESET # pin of the audio decoding chip U1 are connected with the HDA _ SDO pin, the HDA _ BCLK pin, the HDA _ SDI0 pin, the HDA _ SYNC pin and the HDA _ RST # pin of the processor 20 IN a one-to-one manner; a Sense A pin of the audio decoding chip U1 is connected to one end of a first resistor R1 and one end of a second resistor R2, the other end of the first resistor R1 is connected to the output module 130, and the other end of the second resistor R2 is connected to the input module 120; the MIC1_ L pin, the MIC1_ R pin, the MIC1_ VREFO _ R pin and the MIC1_ VREFO _ L pin of the audio decoding chip U1 are all connected with the input module 120; the HP _ OUT _ L pin and the HP _ OUT _ R pin of the audio decoding chip U1 are both connected with the output module 130, the CBN pin of the audio decoding chip U1 is connected with the CBP pin of the audio decoding chip U1 through a first capacitor C1, and the AVSS1 pin, the AVSS2 pin, the PVSS1 pin, the PVSS2 pin, the DVSS2 pin, the GND _ PAD pin and the JDREF pin of the audio decoding chip U1 are all grounded.

The pins PVSS1 and PVSS2 are power grounds. The first voltage +3VS input is a DVDD1 pin of an audio decoding chip U1 and provides core power supply for the audio decoding chip U1; the first voltage +3VS is also input to the DVDD _ IO pin as a digital voltage of 3.3V. The second voltage +5VS is converted into an analog voltage AVDD through the first magnetic bead FB1 and is supplied to the AVDD1 pin and the AVDD2 pin of the audio decoding chip U1 for analog power supply. The second voltage +5VS is converted into 5V voltages (PVDD1 and PVDD2) through the second magnetic bead FB2 and the third magnetic bead FB3, respectively, to supply power to the audio decoding chip U1.

The model of the audio decoding chip U1 is preferably ALC269Q _ VB, which is integrated with a power amplifier module, a digital-to-analog (D/a) module and an analog-to-digital (a/D) module for amplifying a left and right channel power amplifier, and when the computer plays an audio data file, the audio decoding chip U1 decodes digital audio signals (including audio data output signals SDOUT, clock signals BCLK (24MHz), and synchronous sampling signals SYNC), converts the decoded signals into analog audio signals (including left channel output signals CN _ HP _ OUT _ L and right channel output signals CN _ HP _ OUT _ R) through sampling, and transmits the signals to an analog audio output interface in the output module 130, so as to push an external speaker or an external earphone to sound. Meanwhile, after the audio signal is converted into an analog audio signal, the analog audio signal is processed by a power amplifier module in the chip, and the amplified left channel signal (INTSPL + -) and the amplified right channel signal (INTSPR + -) are output to a loudspeaker interface SPK to push the built-in left and right channel sound boxes 30 to sound. The audio decoding chip U1 further performs audio processing on the microphone signals (including a stereo right channel signal MIC1_ R and a stereo left channel signal MIC1_ L) transmitted by the input module 120, and outputs a voice audio signal AC _ SDIN0 to the processor. The audio decoding chip U1 outputs a microphone right channel reference voltage MIC1_ VREFO _ R and a microphone left channel reference voltage MIC1_ VREFO _ L to supply power to the microphone signal of the input module 120.

Through set up power amplifier module, digital-to-analog conversion module and analog-to-digital conversion module in audio decoding chip, need not to increase external power amplifier chip and amplify the conversion circuit, directly amplify by the built-in power amplifier module conversion of chip, the built-in sound channel audio amplifier of controlling of sound channel signal drive mainboard is given birth to about the output, audio decoding chip and peripheral circuit's integrated level is higher, the circuit is simple, part quantity is less, it is little to occupy the PCB space, the application cost is lower, performance safety stability is higher, market competition advantage is great.

The first switch tube Q1 and the second switch tube Q2 are both NMOS tubes. When the RESET signal AC _ RST is at a low level, the RESET # pin transmitted to the audio decoding chip U1 restarts the hardware, at this time, the first MOS transistor Q1 is turned off, the gate of the second MOS transistor Q2 is pulled up to a high level by the third voltage +5VSB, the power amplifier on/off signal shut down # output by the Q2 is turned on to a low level, and the power amplifier module (having a power amplifier switching function) inside the audio decoding chip U1 is turned off. Then the reset signal AC _ RST is raised to a high level and kept, the first MOS transistor Q1 is turned on to pull down the gate of the second MOS transistor Q2, the Q2 is turned off, the first resistor R1 and the second resistor R2 divide the voltage to output a power amplifier on-off signal shut down #, which is at a high level (equal to the second voltage +5VS), and the power amplifier module in the audio decoding chip U1 is turned on.

The sensing signal a output by the audio decoding chip U1 is converted into an audio detection signal HP _ JD by a first resistor R1 and output to the output module 130, and a reference voltage of the detection signal is generated at a JDREF pin, and the sensing signal a can be grounded through a resistor with a resistance of 20K Ω during implementation. The microphone input signal MIC1_ JD transmitted by the input module 120 is converted into a sensing signal Sense a through the second resistor R2. The input module 120 can be determined whether a microphone signal (MIC1_ R, MIC1_ L) is input by detecting a microphone detection signal MIC1_ JD, and the output module 130 can be determined whether an analog audio signal (CN _ HP _ OUT _ R, CN _ HP _ OUT _ L) is output by detecting an audio detection signal HP _ JD.

The VREF pin of the audio decoding chip U1 is a reference voltage of the chip, and the LDO-CAP pin is a calibration signal of the reference voltage. In specific implementation, the CPVEE pin and the LDO _ CAP pin may be filtered by grounding a capacitor, respectively, and the VREF pin is filtered by connecting two capacitors in parallel to the AVSS1 pin. The reference voltage and the calibration signal are more stable. The first capacitor C1 is a filter capacitor for the reference voltage.

Preferably, the audio processing module 110 further includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a second capacitor C2; one end of the third resistor R3 is connected with the PD # pin of the audio decoding chip U1, the drain electrode of the second switch tube Q2 and one end of the fourth resistor R4; the other end of the fourth resistor R4 is grounded, the other end of the third resistor R3 is connected with the second power supply end, one end of the fifth resistor R5 is connected with the grid electrode of the second switch tube Q2 and the drain electrode of the first switch tube Q1, the other end of the fifth resistor R5 is connected with the third power supply end, and one end of the sixth resistor R6 is connected with one end of the seventh resistor R7, one end of the second capacitor C2 and the grid electrode of the first switch tube Q1; the other end of the seventh resistor R7 is connected to the HDA _ RST # pin of the processor 20, and the other end of the sixth resistor R6 is connected to the other end of the second capacitor C2 and ground.

Through the voltage division of the third resistor R3 and the fourth resistor R4, the power amplifier on-off signal SHUTDOWN # can be ensured to output high level, and the audio decoding chip U1 cannot be burnt out. The fifth resistor R5 is used for limiting current and avoiding burning out the second switch Q2. The sixth resistor R6, the seventh resistor R7 and the second capacitor C2 form a current-limiting filter circuit, which can protect the first switch tube Q1 and filter the reset signal AC _ RST to make the conduction state of the Q1 more stable.

Preferably, the AVDD1 pin, the AVDD2 pin, the PVDD1 pin, the PVDD2 pin, the DVDD1 pin and the DVDD _ IO pin of the audio decoding chip U1 may be grounded through two capacitors connected in parallel, respectively, so as to filter each input voltage, and make the audio decoding chip U1 operate more stably.

Referring to fig. 4, the input module 120 includes a microphone input interface MIC _ JACK, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third capacitor C3, and a fourth capacitor C4; the microphone input interface MIC _ JACK is externally connected with a microphone, and a pin 5 of the microphone input interface MIC _ JACK is connected with one end of a ninth resistor R9, one end of an eleventh resistor R11 and one end of a fourth capacitor C4; the 6 th pin of the microphone input interface MIC _ JACK is connected with one end of an eighth resistor R8, one end of a tenth resistor R10 and one end of a third capacitor C3, the other end of the tenth resistor R10 is connected with the other end of an eleventh resistor R11 and the ground, the other end of an eighth resistor R8 is connected with the MIC1_ VREFO _ R pin of the audio decoding chip U1, the other end of a ninth resistor R9 is connected with the MIC1_ VREFO _ L pin of the audio decoding chip U1, the other end of a third capacitor C3 is connected with the MIC1_ R pin of the audio decoding chip U1, the other end of a fourth capacitor C4 is connected with the MIC1_ L pin of the audio decoding chip U1, the 4 th pin of the microphone input interface MIC _ JACK is connected with the other end of the second resistor R2, and the 3 rd pin of the microphone input interface MIC _ JACK and the ground 7 are grounded.

The microphone input interface MIC _ JACK transmits a microphone signal (MIC1_ R, MIC1_ L) collected by a microphone to the audio decoding chip U1. The resistance values of the eighth resistor R8 and the ninth resistor R9 are preferably 4.7K Ω, the resistance values of the tenth resistor R10 and the eleventh resistor R11 are preferably 22K Ω, and the capacitance values of the third capacitor C3 and the fourth capacitor C4 are preferably 1 uF. The microphone signals are powered through the pull-up of R8 and R9, and R10, R11, C3 and C4 form a filter circuit to filter the microphone signals.

Referring to fig. 5, the output module 130 includes an analog audio output interface LINE _ JACK, a twelfth resistor R12, a thirteenth resistor R13, a fifth capacitor C5, and a sixth capacitor C6; the analog audio output interface LINE _ JACK is externally connected with a microphone, and a pin 5 of the analog audio output interface LINE _ JACK is connected with one end of a thirteenth resistor R13 and one end of a sixth capacitor C6; the pin 6 of the analog audio output interface LINE _ JACK is connected with one end of a twelfth resistor R12 and one end of a fifth capacitor C5, the other end of the twelfth resistor R12 is connected with the other end of a thirteenth resistor R13 and the ground, the other end of the fifth capacitor C5 is connected with the pin HP _ OUT _ R of the audio decoding chip U1, the other end of the sixth capacitor C6 is connected with the pin HP _ OUT _ L of the audio decoding chip U1, the pin 4 of the analog audio output interface LINE _ JACK is connected with the other end of the first resistor R1, and the pin 3 and the pin 7 of the analog audio output interface LINE _ JACK are grounded.

The analog audio signal (CN _ HP _ OUT _ L, CN _ HP _ OUT _ R) output by the audio decoding chip U1 is output to an external sound box or earphone through an analog audio output interface LINE _ JACK to drive the external sound box or earphone to generate sound. The resistance values of the twelfth resistor R12 and the thirteenth resistor R13 are preferably 22K omega, the resistors are pull-down resistors, and when no analog audio signal is output, the

pins

5 and 6 of the analog audio output interface LINE _ JACK are pulled down, so that noise is prevented from being mistakenly driven to sound. The capacitance of the fifth capacitor C5 and the sixth capacitor C6 is preferably 10uF, which is used to filter the output analog audio signal to improve sound effect.

To sum up, the utility model provides an on-board sound card audio circuit and computer, through set up power amplifier module in the audio frequency decoding chip and come the conversion to enlarge, the built-in left and right sound channel audio amplifier sound production of sound channel signal drive mainboard about the output. The power amplifier function can be realized without increasing an external power amplifier chip amplification conversion circuit, the circuit is simple, the integration level is high, the number of parts is small, the occupied PCB space is small, the maintenance of engineers' Layout and Debug is facilitated, the cost is reduced, and the performance safety and stability are improved.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A board-mounted sound card audio circuit is connected with a processor and left and right sound channel sound boxes and is characterized by comprising an audio processing module, an input module and an output module; the audio processing module is connected with the input module, the output module, the processor and the left and right sound channel sound boxes; the output module is externally connected with an earphone or a sound box;

2. An on-board sound card audio circuit according to claim 1, wherein the audio processing module comprises an audio decoding chip, a first switch tube, a second switch tube, a first resistor, a second resistor, a first magnetic bead, a second magnetic bead, a third magnetic bead, a first capacitor and a speaker interface;

3. An on-board sound card audio circuit according to claim 2, wherein said audio processing module further comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a second capacitor;

4. An on-board sound card audio circuit according to claim 3, wherein the input module comprises a microphone input interface, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third capacitor, and a fourth capacitor;

5. An on-board sound card audio circuit according to claim 3, wherein the output module comprises an analog audio output interface, a twelfth resistor, a thirteenth resistor, a fifth capacitor and a sixth capacitor;

6. A board-mounted sound card audio circuit according to claim 2, wherein the JDREF pin of the audio decoding chip is connected to ground through a resistor.

7. An on-board sound card audio circuit according to claim 2, wherein the CPVEE pin and LDO _ CAP pin of the audio decoding chip are grounded through a capacitor, respectively.

8. An on-board sound card audio circuit according to claim 2, wherein the CPVEE pin and LDO _ CAP pin of the audio decoding chip are grounded through a capacitor, respectively.

9. A computer comprising a main board on which a processor and left and right channel speakers are provided, wherein an on-board sound card audio circuit according to any one of claims 1 to 8 is further provided; the onboard sound card audio circuit is connected with the processor and the left and right sound channel sound boxes;