Vehicle-mounted audio output system

Abstract

The utility model belongs to the technical field of automotive electronics, and discloses a vehicle-mounted audio output system which comprises a wireless microphone module, a vehicle-mounted anti-howling module, a Bluetooth MCU module, a DSP decoding module and an audio output module. The wireless microphone module receives the first audio signal and wirelessly sends the first audio signal to the vehicle-mounted anti-howling module through Bluetooth; the vehicle-mounted anti-howling module receives the first audio signal, performs anti-howling processing on the first audio signal, and sends the processed first audio signal to the Bluetooth MCU module; the Bluetooth MCU module receives the first audio signal after anti-howling processing, and wirelessly receives a second audio signal of the mobile device through Bluetooth; the first audio signal and the second audio signal are sent to a DSP decoding module; the DSP decoding module decodes and combines the received first audio signal and second audio signal to obtain an audio output signal and sends the audio output signal to the audio output module; and the audio output module receives and plays the audio output signal. According to the application, wireless connection between the microphone and the vehicle-mounted audio system can be realized, anti-howling processing on audio frequency is carried out, the definition and trueness of sound quality are improved, and the effects of convenient use, sound quality improvement and howling elimination are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automotive electronics, in particular to a vehicle-mounted audio output system. BACKGROUND

[0002] As an important part of modern vehicles, the vehicle-mounted audio system provides drivers and passengers with rich entertainment experience, effectively relieving the monotony and fatigue during driving. However, with the increasing demand for vehicle entertainment, especially during long-distance driving, rear passengers often lack sufficient entertainment methods, which to some extent affects the driving experience. Moreover, the existing vehicle-mounted audio system is prone to howling when processing high-volume or specific frequency audio signals, which not only greatly affects the sound quality but also may damage the audio equipment and reduce user experience. In the vehicle-mounted environment, due to the relatively closed space and many interference factors such as vibration and noise, the howling phenomenon is particularly significant. SUMMARY

[0003] The present application provides a vehicle-mounted audio output system that can realize wireless connection between the microphone and the vehicle-mounted audio system and perform anti-howling processing on the audio, improving the clarity and authenticity of the sound quality, achieving the effects of convenient use, improved sound quality, and elimination of howling.

[0004] The present application provides a vehicle-mounted audio output system, comprising a wireless microphone module, a vehicle-mounted anti-howling module, a Bluetooth MCU module, a DSP decoding module, and an audio output module.

[0005] The wireless microphone module is used to receive a first audio signal and transmit it to the vehicle-mounted anti-howling module wirelessly through Bluetooth.

[0006] The vehicle-mounted anti-howling module is used to receive the first audio signal, perform anti-howling processing on the first audio signal, and transmit the processed first audio signal to the Bluetooth MCU module.

[0007] The Bluetooth MCU module is used to receive the first audio signal after anti-howling processing, receive a second audio signal of a mobile device wirelessly through Bluetooth, and transmit the first audio signal and the second audio signal to the DSP decoding module.

[0008] The DSP decoding module is used to decode and merge the received first audio signal and second audio signal, obtain an audio output signal, and transmit it to the audio output module.

[0009] The audio output module is used to receive the audio output signal and play it.

[0010] Further, the vehicle-mounted anti-howling module comprises a receiving unit, an anti-howling processing unit, a channel audio output unit and a power supply unit; the receiving unit is configured to receive the first audio signal sent by the wireless microphone module and send the first audio signal to the anti-howling processing unit;

[0011] The anti-howling processing unit is configured to receive the first audio signal, perform anti-howling processing on the first audio signal, and send the processed first audio signal to the channel audio output unit;

[0012] The channel audio output unit is configured to send the received first audio signal to the Bluetooth MCU module;

[0013] The power supply unit is configured to provide power supply signals to the receiving unit, the anti-howling processing unit and the channel audio output unit.

[0014] Further, the Bluetooth MCU module is further configured to receive a key control signal, generate a volume control signal according to the key control signal and send the volume control signal to the audio output module;

[0015] The audio output module is further configured to adjust the parameters of the played audio output signal according to the volume control signal.

[0016] Further, the audio output module comprises:

[0017] The pre-amplification driving unit is configured to receive the audio output signal and amplify the audio output signal, and send the amplified audio output signal to the first power amplifier output unit, the high-low sound attenuation control unit and the RCA output unit respectively;

[0018] The mute control unit is configured to control the first power amplifier output unit, the second power amplifier output unit, the high-low sound attenuation control unit, the RCA output unit and the subwoofer output unit to stop playing according to the received volume control signal;

[0019] The first power amplifier output unit is configured to receive and output the amplified audio output signal;

[0020] The high-low sound attenuation control unit is configured to adjust the high-frequency parameters and the low-frequency parameters in the audio output signal through an RC circuit to obtain a mid-high frequency signal, and send the mid-high frequency signal to the second power amplifier output unit;

[0021] The second power amplifier output unit is configured to receive and output the mid-high frequency signal;

[0022] The RCA output unit is configured to filter the audio output signal according to a preset low-frequency threshold to obtain a low-frequency output signal, and send the low-frequency output signal to the subwoofer output unit;

[0023] The subwoofer output unit is configured to receive and output the low-frequency output signal.

[0024] Further, the power supply unit provides a 5V power signal to the receiving unit, the anti-howling processing unit and the channel audio output unit.

[0025] Further, the first power amplifier output unit includes 4-bit terminal speaker output interfaces, which are used to play audio output signals.

[0026] Further, the second power amplifier output unit includes 2 speaker output interfaces, which are used to play medium-high audio signals.

[0027] Further, the system further includes a power module; the power module includes a direct current battery unit, a key detection unit and an MCU power supply unit; the direct current battery unit is used to provide a 12V power signal to the key detection unit and the MCU power supply unit;

[0028] The key detection unit is used to send the 12V power signal to the Bluetooth MCU module when the key is detected to be inserted;

[0029] The power supply module is used to convert the 12V power signal into a 5V power signal and send it to the Bluetooth MCU module.

[0030] Further, the power module further includes a voltage stabilizing unit, a USB fast charging unit and a direct current system output unit;

[0031] The direct current battery unit is also used to provide a 12V power signal to the voltage stabilizing unit and the direct current system output unit;

[0032] The voltage stabilizing unit is used to convert the 12V power signal into a 5V voltage stabilizing signal and send it to the USB fast charging unit;

[0033] The direct current system output unit is used to convert the 12V power signal into a 9V direct current power signal and output.

[0034] Further, the audio output module is provided with a cooling fin, and the weight of the cooling fin is 200 grams.

[0035] Compared with the prior art, the technical scheme provided by the embodiment of the application has at least the following beneficial effects: wireless connection between the microphone and the vehicle audio is realized, and the riding experience of the people in the vehicle is improved; the vehicle anti-howling module performs anti-howling processing on the audio signal emitted by the wireless microphone, adjusts the gain and phase of the audio signal in time, greatly improves the stability of the audio signal, ensures clear sound quality in a variable vehicle environment, effectively enhances the auditory comfort of the user, avoids potential damage to hearing caused by long-term exposure to high volume environment, and performs high-fidelity processing on the audio signal, improves the clarity and authenticity of the sound quality, and finally achieves the effects of convenient use, improved sound quality and eliminated howling. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 A structural schematic diagram of a vehicle audio output system is provided for an exemplary embodiment of the present application.

[0037] Figure 2 A circuit diagram of a receiving unit in a vehicle anti-whistling module is provided for an exemplary embodiment of the present application.

[0038] Figure 3 A circuit diagram of an anti-whistling processing unit in a vehicle anti-whistling module is provided for an exemplary embodiment of the present application.

[0039] Figure 4 A circuit diagram of a channel audio output unit in a vehicle anti-whistling module is provided for an exemplary embodiment of the present application.

[0040] Figure 5 A structural schematic diagram of an audio output module is provided for an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0042] Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] Referring to Figure 1 The embodiments of the present application provide a vehicle audio output system, specifically including a wireless microphone module, a vehicle anti-whistling module, a Bluetooth MCU module, a DSP decoding module and an audio output module.

[0044] The wireless microphone module is configured to receive a first audio signal and transmit the first audio signal to the vehicle anti-whistling module wirelessly through Bluetooth.

[0045] The vehicle anti-whistling module is configured to receive the first audio signal, perform anti-whistling processing on the first audio signal, and transmit the processed first audio signal to the Bluetooth MCU module.

[0046] The Bluetooth MCU module is configured to receive the first audio signal after anti-whistling processing, receive a second audio signal of a mobile device wirelessly through Bluetooth, and transmit the first audio signal and the second audio signal to the DSP decoding module.

[0047] The Bluetooth MCU module adopts A7900C chip, is connected with an FM antenna input unit and a crystal oscillator unit; the FM antenna input unit enhances the receiving range of the second audio signal, the crystal oscillator unit provides a stable and accurate high-frequency clock signal, ensures that the operation of processing the first audio signal and the second audio signal is quickly completed under correct timing, and reduces electromagnetic interference, ensuring stable operation of the entire chip.

[0048] The DSP decoding module is used for decoding and merging the received first audio signal and second audio signal to obtain an audio output signal and send the audio output signal to the audio output module.

[0049] The DSP decoding module adopts AK7604 chip, has 4-way audio receiving interfaces and 4-way audio output interfaces, can decode the received audio signal, and output the audio signal to the audio output module for processing, so that the sound quality is clearer.

[0050] The audio output module is used for receiving the audio output signal and playing the audio output signal.

[0051] The above embodiment realizes wireless connection of the microphone and the vehicle-mounted sound equipment, improves the riding experience of the people in the vehicle; the vehicle-mounted anti-howling module performs anti-howling processing on the audio signal emitted by the wireless microphone, timely adjusts the gain and phase of the audio signal, greatly improves the stability of the audio signal, ensures clear sound quality in a variable vehicle environment, effectively enhances the auditory comfort of the user, avoids potential damage to hearing caused by long-term exposure to high-volume environment, and improves the clarity and authenticity of the sound quality through high-fidelity processing of the audio signal, finally achieves the effects of convenient use, improved sound quality and eliminated howling.

[0052] In some embodiments, the vehicle-mounted anti-howling module includes a receiving unit, an anti-howling processing unit, a channel audio output unit and a power supply unit. Referring to Figure 2 , the receiving unit is used for receiving the first audio signal sent by the wireless microphone module and sending the first audio signal to the anti-howling processing unit; specifically, the receiving unit is connected with the wireless microphone module through Bluetooth wireless communication.

[0053] Referring to Figure 3 , the anti-howling processing unit is used for receiving the first audio signal, performing anti-howling processing on the first audio signal, and sending the processed first audio signal to the channel audio output unit.

[0054] Referring to Figure 4 , the channel audio output unit is used for sending the received first audio signal to the Bluetooth MCU module.

[0055] The power supply unit is configured to provide a power supply signal to the receiving unit, the anti-howling processing unit and the channel audio output unit, and specifically configured to provide a 5V power supply signal to the receiving unit, the anti-howling processing unit and the channel audio output unit.

[0056] In some embodiments, the Bluetooth MCU module is further configured to receive a key control signal, generate a volume control signal according to the key control signal and send the volume control signal to the audio output module.

[0057] The Bluetooth MCU module is connected with the remote control receiving head unit, the SD playing unit, the USB2.0 playing unit, the key control unit and the shell module respectively. Specifically, the key control unit includes a KEY key control key and a VOL volume control key, and the key control signal is a signal received by the VOL volume control key. The shell module includes a display driving unit, a broken code LCD, a DAB digital radio interface, a SI 4730+4745 radio module, an AUX external input and a MIC microphone input.

[0058] Specifically, the display driving unit is an HT1622 or an HT1623, and is connected with the broken code LCD. The clear external interface makes it convenient for the passenger to operate and reduces the risk of distraction during driving.

[0059] The audio output module is further configured to adjust the parameters of the played audio output signal according to the volume control signal.

[0060] Referring to Figure 5 In some embodiments, the audio output module includes:

[0061] The pre-amplification driving unit is configured to receive the audio output signal and amplify the audio output signal, and send the amplified audio output signal to the first power amplifier output unit, the bass and treble attenuation control unit and the RCA output unit respectively.

[0062] The pre-amplification driving unit includes two 4558 operational amplifiers, is connected with the first power amplifier output unit through a 4-way output interface, is connected with the bass and treble attenuation control unit through a 2-way output interface, is connected with the RCA output unit through a 2-way output interface, and is connected with the bass horn output unit through a 1-way output interface.

[0063] The mute control unit is configured to control the first power amplifier output unit, the second power amplifier output unit, the bass and treble attenuation control unit, the RCA output unit and the bass horn output unit to stop playing according to the received volume control signal.

[0064] The mute control unit controls the system to start playing or stop playing according to different levels by receiving the control signal input by the key control panel; specifically, when the control signal is a high-level signal, the mute control unit remains closed, and the system plays audio; when the control signal is a low-level signal, the mute control unit remains open, and the system stops playing audio.

[0065] The first power amplifier output unit is configured to receive and output an amplified audio output signal.

[0066] The first power amplifier output unit includes four 4-terminal speaker output interfaces, each of which is configured to play the audio output signal.

[0067] The first power amplifier output unit can adopt a 7851-Speaker 4*35W module to realize four-channel full-frequency playback.

[0068] The bass and treble attenuation control unit is configured to adjust the high-frequency parameter and the low-frequency parameter in the audio output signal through an RC circuit to obtain a mid-high audio signal, and send the mid-high audio signal to the second power amplifier output unit.

[0069] The second power amplifier output unit is configured to receive and output the mid-high audio signal.

[0070] The second power amplifier output unit includes two speaker output interfaces, each of which is configured to play the mid-high audio signal.

[0071] Specifically, the second power amplifier output unit can adopt a 7388-Speaker 4*25W module to optimize the mid-high audio signal; specifically, the second power amplifier output unit is also connected with two sets of center output seats to help balance the sound of left and right channels, provide better mid-high playback effect, and significantly enhance the stereoscopic sense of sound.

[0072] The two speaker output interfaces included in the second power amplifier output unit are center output interfaces, which are connected with center speakers to improve the clarity of the human audio input signal and provide a better experience for passengers in the vehicle; the center speakers can also stabilize the sound image to ensure the continuity and smoothness of the sound image when moving, greatly improving the listening environment in the vehicle; when the center speakers work cooperatively with other loudspeakers, they can also bring better stereo sound effects.

[0073] The RCA output unit is configured to filter the audio output signal according to a preset low-frequency threshold to obtain a low-frequency output signal, and send the low-frequency output signal to the subwoofer output unit.

[0074] Specifically, the RCA output unit optimizes the bass audio signal and accurately transmits the optimized bass audio signal to the subwoofer output unit to enhance the realism of the bass audio.

[0075] The bass output unit is used for receiving and outputting a low-frequency output signal, thereby adding good bass effect to the system.

[0076] The audio output module of the above embodiment realizes the six-channel three-frequency division playing of the audio output signal, thereby improving the hearing effect.

[0077] In some embodiments, the system further comprises a power module.

[0078] The power module comprises a DC battery unit, a car key detection unit and an MCU power supply unit.

[0079] The DC battery unit is used to provide a 12V power signal to the car key detection unit and the MCU power supply unit.

[0080] The car key detection unit is used to send the 12V power signal to the Bluetooth MCU module when the key is detected to be inserted.

[0081] The power module is used to convert the 12V power signal into a 5V power signal and send it to the Bluetooth MCU module.

[0082] In some embodiments, the power module further comprises a voltage stabilizing unit, a USB fast charging unit and a DC system output unit.

[0083] The DC battery unit is also used to provide a 12V power signal to the voltage stabilizing unit and the DC system output unit.

[0084] The voltage stabilizing unit is used to convert the 12V power signal into a 5V stabilized signal and send it to the USB fast charging unit.

[0085] The DC system output unit is used to convert the 12V power signal into a 9V DC power signal and output it.

[0086] The power module in the above embodiment provides the vehicle-mounted audio output system with stable electrical signals, so that the system can operate stably.

[0087] In some embodiments, the audio output module is provided with a cooling fin, and the weight of the cooling fin is 200 grams.

[0088] Unlike ordinary cooling fins, the 200-gram cooling fin used in the present application is sufficient in weight and has a more powerful cooling function, resulting in smaller distortion of the audio signal and greatly improving the stability of the overall structure.

[0089] The technical features of the above embodiments can be combined arbitrarily, and to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0090] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are all within the scope of the present application. Therefore, the scope of protection of the patent of the present application should be subject to the appended claims.

Claims

1. An in-vehicle audio output system characterized by comprising: The wireless microphone module, the vehicle-mounted anti-howling module, the Bluetooth MCU module, the DSP decoding module and the audio output module are included. The wireless microphone module is configured to receive a first audio signal and transmit the first audio signal to the vehicle-mounted anti-howling module via Bluetooth wireless transmission. The vehicle-mounted anti-howling module is configured to receive the first audio signal, perform anti-howling processing on the first audio signal, and transmit the processed first audio signal to the Bluetooth MCU module. The Bluetooth MCU module is configured to receive the first audio signal processed by the anti-howling processing, receive a second audio signal of a mobile device via Bluetooth wireless transmission, and transmit the first audio signal and the second audio signal to the DSP decoding module. The DSP decoding module is configured to decode and combine the received first audio signal and second audio signal to obtain an audio output signal and transmit the audio output signal to the audio output module. The audio output module is configured to receive the audio output signal and play the audio output signal.

2. The in-vehicle audio output system according to claim 1, characterized by, The vehicle-mounted anti-howling module includes a receiving unit, an anti-howling processing unit, a channel audio output unit and a power supply unit. The receiving unit is configured to receive the first audio signal transmitted by the wireless microphone module and transmit the first audio signal to the anti-howling processing unit. The anti-howling processing unit is configured to receive the first audio signal, perform anti-howling processing on the first audio signal, and transmit the processed first audio signal to the channel audio output unit. The channel audio output unit is configured to transmit the received first audio signal to the Bluetooth MCU module. The power supply unit is configured to provide a power signal to the receiving unit, the anti-howling processing unit and the channel audio output unit.

3. The in-vehicle audio output system according to claim 1, characterized in that, The Bluetooth MCU module is further configured to receive a key control signal, generate a volume control signal according to the key control signal, and transmit the volume control signal to the audio output module. The audio output module is further configured to adjust a parameter of the played audio output signal according to the volume control signal.

4. The in-vehicle audio output system according to claim 3, characterized in that, The audio output module includes: The pre-amplification driving unit is configured to receive the audio output signal, amplify the audio output signal, and transmit the amplified audio output signal to the first power amplifier output unit, the high-low sound attenuation control unit and the RCA output unit. The mute control unit is configured to control the first power amplifier output unit, the second power amplifier output unit, the high-low sound attenuation control unit, the RCA output unit and the subwoofer output unit to stop playing according to the received volume control signal. The first power amplifier output unit is configured to receive and output the amplified audio output signal. The high-low sound attenuation control unit is configured to adjust a high frequency parameter and a low frequency parameter in the audio output signal via an RC circuit to obtain a medium-high frequency signal, and transmit the medium-high frequency signal to the second power amplifier output unit. The second power amplifier output unit is configured to receive and output the medium-high frequency signal. The RCA output unit is configured to filter the audio output signal according to a preset low frequency threshold to obtain a low frequency output signal, and transmit the low frequency output signal to the subwoofer output unit. The subwoofer output unit is configured to receive and output the low frequency output signal.

5. The in-vehicle audio output system according to claim 2, characterized in that, The power supply unit provides a 5V power signal to the receiving unit, the anti-howling processing unit and the channel audio output unit.

6. The in-vehicle audio output system according to claim 4, characterized in that, The first power amplifier output unit includes 4-bit terminal speaker output interfaces, each of which is used to play the audio output signal.

7. The in-vehicle audio output system according to claim 4, characterized in that, The second power amplifier output unit includes 2 speaker output interfaces, each of which is used to play the mid-high frequency signal.

8. The in-vehicle audio output system according to claim 7, characterized in that, It also includes a power module; the power module includes a direct current battery unit, a car key detection unit and an MCU power supply unit; The direct current battery unit is used to provide a 12V power signal to the car key detection unit and the MCU power supply unit; The car key detection unit is used to send a 12V power signal to the Bluetooth MCU module when the key is detected to be inserted; The power supply module is used to convert the 12V power signal into a 5V power signal and send it to the Bluetooth MCU module.

9. The in-vehicle audio output system according to claim 8, characterized in that, The power module further includes a voltage stabilizing unit, a USB fast charging unit and a direct current system output unit; The direct current battery unit is also used to provide a 12V power signal to the voltage stabilizing unit and the direct current system output unit; The voltage stabilizing unit is used to convert the 12V power signal into a 5V stabilized signal and send it to the USB fast charging unit; The direct current system output unit is used to convert the 12V power signal into a 9V direct current power signal and output it.

10. The in-vehicle audio output system of claim 1, wherein, The audio output module is provided with a cooling fin, and the weight of the cooling fin is 200 grams.

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