Audio device, audio system and vehicle

Abstract

The utility model discloses an audio device, an audio system and a vehicle. The audio device comprises an audio input interface, and the input end of the audio input interface is suitable for being connected with a connector; and the switching module comprises an AUX signal loop and a microphone signal loop, the input end of the switching module is connected with the output end of the audio input interface, and the switching module is used for selectively conducting the AUX signal loop or the microphone signal loop when the connector is connected. According to the device, the audio input interface is multiplexed to integrate an AUX function and a microphone function, so that the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially is related to an audio frequency device, audio frequency system and vehicle. BACKGROUND

[0002] With the continuous development of vehicle technology, the entertainment function of the car machine is more and more valued by consumers, and the vehicle with strong entertainment is more easily selected by consumers.

[0003] In the related art, the AUX function and the K song function of the vehicle are separated, the AUX and the K song receiver are integrated in the HUB assembly, the audio signal is given to the host through the USB signal line, so that the AUX function and the K song function are realized. However, this method needs to form an additional assembly, which is high in cost. UTILITY MODEL CONTENT

[0004] The utility model aims at at least solving one of the technical problems existing in the prior art. Therefore, one purpose of the utility model is to provide an audio frequency device, which integrates the AUX function and the microphone function by multiplexing the audio frequency input interface, thereby reducing the cost.

[0005] The second purpose of the utility model is to provide an audio frequency system.

[0006] The third purpose of the utility model is to provide a vehicle.

[0007] In order to solve the above problems, the utility model discloses a first aspect of embodiment of an audio frequency device, which comprises: an audio frequency input interface, the input end of the audio frequency input interface is adapted to access a connector; a switching module, the switching module comprises an AUX signal loop and a microphone signal loop, the input end of the switching module is connected with the output end of the audio frequency input interface, and the switching module is used for selectively conducting the AUX signal loop or the microphone signal loop when the connector is accessed.

[0008] According to the audio frequency device of the utility model embodiment, the audio frequency input interface is multiplexed to plug the connector, such as the AUX connector or the microphone connector, and then the AUX signal loop and the microphone signal loop are selectively conducted by the switching module after the connector is accessed, so that the AUX function can be realized when the AUX signal loop is conducted, or the K song function can be realized when the microphone signal loop is conducted. Therefore, the AUX function and the K song microphone function are integrated by multiplexing the audio frequency input interface, so that the microphone receiver does not need to be additionally set, and the cost is effectively saved.

[0009] In some embodiments, the switching module comprises: a first switch comprising a first static contact, a first dynamic contact and a second dynamic contact, the first static contact being connected with an output end of the audio input interface, the first static contact being selectively connectable with the first dynamic contact and the second dynamic contact; a second switch comprising a second static contact, a third dynamic contact and a fourth dynamic contact, the third dynamic contact being connected with the first dynamic contact, the fourth dynamic contact being connected with the second dynamic contact, the second static contact being selectively connectable with the third dynamic contact and the fourth dynamic contact for outputting an AUX signal or a microphone signal; wherein the first static contact, the first dynamic contact, the third dynamic contact and the second static contact form the AUX signal loop, and the first static contact, the second dynamic contact, the fourth dynamic contact and the second static contact form the microphone signal loop.

[0010] In some embodiments, the switching module further comprises: an operational amplifier circuit connected between the second dynamic contact and the fourth dynamic contact, the operational amplifier circuit being configured to amplify the microphone signal when the microphone signal loop is turned on.

[0011] In some embodiments, the operational amplifier circuit comprises: a gain unit, an input end of the gain unit being connected with the second dynamic contact; a filter unit, an input end of the filter unit being connected with a bias signal; an operational amplifier unit, a reverse input end of the operational amplifier unit being connected with a first output end of the gain unit, a forward input end of the operational amplifier unit being connected with an output end of the filter unit, an output end of the operational amplifier unit being connected with a second output end of the gain unit; a common mode rejection unit, a first end of the common mode rejection unit being connected with the forward input end and the output end of the filter unit, a second end of the common mode rejection unit being connected with the reverse input end and the first output end of the gain unit; and a voltage dividing unit, an input end of the voltage dividing unit being connected with the output end of the operational amplifier unit, the voltage dividing unit being configured to output the amplified microphone signal.

[0012] In some embodiments, the gain unit comprises: a first capacitor, a first end of the first capacitor being connected with the second moving contact; a first resistor, a first end of the first resistor being connected with a second end of the first capacitor, and a second end of the first resistor being connected with the inverting input terminal; a second capacitor, a first end of the second capacitor being connected with the first end of the first resistor, and a second end of the second capacitor being grounded; a second resistor, a first end of the second resistor being connected with the first end of the first resistor, the inverting input terminal, and a second end of the second resistor being connected with an output terminal of the operational amplifier unit.

[0013] In some embodiments, the filter unit comprises: a third resistor, a first end of the third resistor being connected with a bias signal, and a second end of the third resistor being connected with the non-inverting input terminal; a fourth capacitor, a first end of the fourth capacitor being connected with the second end of the third resistor, and a second end of the fourth capacitor being grounded; and a fifth capacitor, a first end of the fifth capacitor being connected with the second end of the third resistor, the non-inverting input terminal, and a second end of the fifth capacitor being connected with the first end of the third resistor.

[0014] In some embodiments, the voltage division unit comprises: a fourth resistor, a first end of the fourth resistor being connected with the output terminal of the operational amplifier unit and a second output terminal of the gain unit, and a second end of the fourth resistor being used for outputting the amplified microphone signal; a sixth capacitor, a first end of the sixth capacitor being connected with the second end of the fourth resistor, and a second end of the sixth capacitor being grounded; and a fifth resistor, a first end of the fifth resistor being connected with the first end of the sixth capacitor and the second end of the fourth resistor, and a second end of the fifth resistor being grounded.

[0015] In some embodiments, the common-mode rejection unit comprises: a seventh capacitor, a first end of the sixth capacitor being connected with the non-inverting input terminal and an output terminal of the filter unit, and a second end of the seventh capacitor being connected with the inverting input terminal and a first output terminal of the gain unit.

[0016] In some embodiments, an input terminal of the switching module is connected with a left channel output terminal of the audio input interface.

[0017] The utility model discloses a second aspect embodiment proposes an audio system, comprising the audio device of above -mentioned embodiment.

[0018] According to the audio system of the utility model embodiment, the audio device multiplexes the audio input interface to integrate the AUX function and the microphone function, and the cost is reduced.

[0019] In some embodiments, the audio system further comprises a master control chip connected with the audio device, the master control chip being configured to control a switching module of the audio device to turn on the AUX signal loop when detecting the plug-in access and not receiving the KTV starting signal, or to control the switching module of the audio device to turn on the microphone signal loop when detecting the plug-in access and receiving the KTV starting signal.

[0020] In some embodiments, the audio system further comprises a digital signal processing chip connected with an output end of the switching module and a left channel output end of an audio input interface in the audio device, the digital signal processing chip being configured to perform mixing processing on the AUX signal or the microphone signal to obtain a digital audio signal.

[0021] In some embodiments, the audio system further comprises a KTV system processing chip connected with the digital signal processing chip, the KTV system processing chip being configured to receive the digital audio signal sent by the digital signal processing chip and further configured to send a accompaniment signal to the digital signal processing chip.

[0022] In some embodiments, the audio system further comprises a sound equipment connected with the digital signal processing chip, the sound equipment being configured to perform sound playing according to the digital audio signal sent by the digital signal processing chip.

[0023] The third aspect of the present application provides a vehicle comprising the audio system of the above embodiments.

[0024] According to the vehicle of the present application, the audio device in the audio system multiplexes the audio input interface to integrate the AUX function and the microphone function, thereby reducing the cost.

[0025] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings, in which:

[0027] Figure 1 is an AUX function and KTV function integrated schematic diagram;

[0028] Figure 2 is another AUX function and KTV function integrated schematic diagram;

[0029] Figure 3is a schematic diagram of an audio system according to an embodiment of the present application;

[0030] Figure 4 is a schematic diagram of an operational amplifier circuit according to an embodiment of the present application;

[0031] Figure 5 (a)-(b) are schematic diagrams of interface definitions;

[0032] Figure 6 is a structural block diagram of a vehicle according to an embodiment of the present application.

[0033] Reference signs:

[0034] Vehicle 3000;

[0035] Audio system 2000; audio device 1000;

[0036] Audio input interface 100; switching module 200; master control chip 300; digital signal processing chip 400; K song system processing chip 500; sound equipment 600;

[0037] First switch 10; second switch 20; operational amplifier circuit 30;

[0038] Gain unit 1; filter unit 2; operational amplifier unit 3; common mode rejection unit 4; voltage division unit 5; first static contact A; first dynamic contact A1; second dynamic contact A2; second static contact B; third dynamic contact B1; fourth dynamic contact B2; first capacitor C1; first resistor R1; second capacitor C2; second resistor R2; third capacitor C3; third resistor R3; fourth capacitor C4; fifth capacitor C5; fourth resistor R4; sixth capacitor C6; fifth resistor R5; seventh capacitor C7. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described in detail below, and the embodiments described with reference to the drawings are exemplary, and the embodiments of the present application are described in detail below.

[0040] In the related art, the AUX function and the K song function are separated, and one scheme is as shown in Figure 1 The scheme is to integrate the AUX and the K song receiver in the HUB assembly, to give the audio signal to the host through the USB signal line, so as to realize the AUX function and the K song function, and the scheme has the following disadvantages: an assembly needs to be additionally made, the cost is high; the K song uses a wireless connection mode, so that the distortion is relatively serious, and many algorithms need to be added at the back end to achieve a certain effect, and the effect is not ideal; a time delay exists in the wireless mode, and the time delay is relatively large, so that the K song effect is not good. Another scheme is as shown in Figure 2As shown, the scheme UX function is integrated on the host, and K song is performed through the wireless MIC connection FM set channel. The disadvantage of this is that: although the AUX function is integrated into the car machine, the K song function still has a time delay problem, resulting in unsatisfactory effect; the distortion of the FM frequency modulation method is more serious than that of the wireless K song transceiver, the processing algorithm needs to be added to the back end, and the effect is also poorer.

[0041] To solve the above problems, the utility model first aspect embodiment proposes an audio device, the device integrates AUX and K song function, and can selectively switch, reduces the cost at the same time solves the K song function time delay and audio distortion problem.

[0042] Reference is made below Figure 3 The audio device 100 according to the utility model embodiment is described, and the audio device 1000 includes an audio input interface 100 and a switching module 200.

[0043] The input end of the audio input interface 100 is adapted to access the connector; the switching module 200 includes an AUX signal loop and a microphone signal loop, the input end of the switching module 200 is connected with the output end of the audio input interface, and the switching module 200 is used for selectively conducting the AUX signal loop or the microphone signal loop when the connector is accessed.

[0044] Specifically, in the related art, an assembly needs to be additionally designed to realize the AUX function and the K song function, which is high in cost, in order to solve the above problems, the audio input interface is reused to plug the connector, such as AUX connector or microphone connector, so that a microphone receiver does not need to be additionally arranged, and the cost can be effectively saved; and in the prior art, the K song audio signal transmission can only be realized through the wireless transmitter and receiver, and there is a long time delay problem, for this, the transmission rate of the audio input interface is below ms level, so the audio input interface 100 is reused to transmit the audio signal or the microphone signal, which can effectively ensure the transmission speed of the signal and solve the signal delay problem, at the same time, compared with the wireless transmission mode, the audio input interface 100 and the connector are connected by hard wire, which can also reduce the distortion of the audio signal, for example, the hard wire connection mode can realize the distortion of audio signal below 0.5% in full frequency band, and the full frequency band curve can be ±0.5db.

[0045] Wherein, after the user connects the plug into the input end of the audio input interface, the switching module 200 selectively turns on the AUX signal loop or the microphone signal loop according to the user's demand, specifically, if the user enables the AUX function, the AUX signal loop is turned on; if the user enables the K song function, the microphone signal loop is turned on, so that the audio device 1000 integrates the AUX function and the K song function, and can selectively switch according to the user's demand. Wherein, if the user enables the K song function, the user also needs to open the K song software, if the user uses the microphone to connect to the input end of the audio input interface, and the user opens the K song software, the switching module 20 turns on the microphone signal loop.

[0046] According to the audio device 1000 of the embodiment of the utility model, through multiplexing audio input interface to plug in plug, such as AUX plug or microphone plug, and then after the plug is connected, the AUX signal loop and the microphone signal loop can be selectively turned on by the switching module, so that the AUX function can be realized when the AUX signal loop is turned on, or the K song function can be realized when the microphone signal loop is turned on, thereby integrating the AUX function and the K song microphone function through multiplexing audio input interface, so that the microphone receiver does not need to be additionally set, and the cost is effectively saved.

[0047] In some embodiments, as shown in Figure 3 The switching module 20 includes a first switch 10 and a second switch 20.

[0048] Wherein, the first switch 10 includes a first static contact A, a first moving contact A1 and a second moving contact A2, the first static contact A is connected with the output end of the audio input interface 100, and the first static contact A is selectively connected with the first moving contact A1 and the second moving contact A2; the second switch 20 includes a second static contact B, a third moving contact B1 and a fourth moving contact B2, the third moving contact B1 is connected with the first moving contact A1, the fourth moving contact B2 is connected with the second moving contact A2, and the second static contact B is selectively connected with the third moving contact B1 and the fourth moving contact B2 for outputting AUX signal or microphone signal; the first static contact A, the first moving contact A1, the third moving contact B1 and the second static contact B form the AUX signal loop, and the first static contact A, the second moving contact A2, the fourth moving contact B2 and the second static contact B form the microphone signal loop.

[0049] Specifically, after determining the connector to be connected to the input end of the audio input interface 100, the switching module 20 controls the connection method of each contact according to user needs. If the user activates the AUX function, the switching module 200 controls the first stationary contact A and the first moving contact A1 to connect, and the second stationary contact B and the third moving contact B1 to connect. Based on this connection method, the switching module 20 selects the AUX signal circuit to be turned on, and the AUX signal is emitted from the output end of the audio input interface 100, passing through the second stationary contact B, the third moving contact B1, the first moving contact A1, and the first stationary contact A before being output. If the user activates the karaoke function, the switching module 20 controls the first stationary contact A and the second moving contact A2 to connect, and the second stationary contact B and the fourth moving contact B2 to connect. Based on this connection method, the switching module 200 selects the microphone signal circuit to be turned on, and the microphone signal is emitted from the output end of the audio input interface 100, passing through the second stationary contact B, the fourth moving contact B2, the second moving contact A2, and the first stationary contact A before being output. In the AUX signal circuit and the microphone signal circuit, the audio signal propagates in the form of an electrical signal. The propagation speed is very fast, and the audio signal delay is less than ms.

[0050] In some embodiments, such as Figure 3 As shown, the switching module 200 also includes an operational amplifier circuit 30.

[0051] The operational amplifier circuit 30 is connected between the second moving contact A2 and the fourth moving contact B2. The operational amplifier circuit 30 is used to amplify the microphone signal when the microphone signal circuit is turned on.

[0052] Specifically, when the microphone signal loop is on, the operational amplifier circuit 30 amplifies the microphone signal through analog signal amplification, which reduces the distortion of the microphone signal and ensures good signal integrity. Since the microphone used for karaoke is connected to the host via a wiring harness, the transmission of the microphone signal is also very fast, typically below the millisecond level.

[0053] In some embodiments, such as Figure 4 As shown, the operational amplifier circuit 30 includes a gain unit 1, a filter unit 2, an operational amplifier unit 3, a common-mode rejection unit 4, and a voltage divider unit 5.

[0054] In this configuration, the input terminal of gain unit 1 is connected to the second moving contact A2; the input terminal of filter unit 2 is connected to the bias signal; the inverting input terminal b of operational amplifier unit 3 is connected to the first output terminal of gain unit 1, the non-inverting input terminal a of operational amplifier unit 3 is connected to the output terminal of filter unit 2, and the output terminal c of operational amplifier unit 3 is connected to the second output terminal of gain unit 1; the first terminal of common-mode rejection unit 4 is connected to the non-inverting input terminal and the output terminal of filter unit 2, and the second terminal of common-mode rejection unit 4 is connected to the inverting input terminal b and the first output terminal of gain unit 1; the input terminal of voltage divider unit 5 is connected to the output terminal c of operational amplifier unit 3, and voltage divider unit 5 is used to output the amplified microphone signal.

[0055] Specifically, when the microphone signal loop is on, the microphone signal is input to gain unit 1, where it is initially amplified and then sent to the inverting input of operational amplifier unit 3. Simultaneously, filter unit 2 receives the bias signal, filters it, and sends it to the non-inverting input of operational amplifier unit 3. Operational amplifier unit 3, with its differential amplification characteristics, sends the processed microphone signal to voltage divider unit 5, which finally outputs the amplified microphone signal. The common-mode rejection unit 4 reduces common-mode interference by balancing the voltages at the non-inverting and inverting inputs of operational amplifier unit 3.

[0056] In some embodiments, such as Figure 4 As shown, the gain unit 1 includes a first capacitor C1, a first resistor R1, a second capacitor C2, a second resistor R2, and a third capacitor C3.

[0057] Specifically, the first terminal of the first capacitor C1 is connected to the second moving contact A2; the first terminal of the first resistor R1 is connected to the second terminal of the first capacitor C1, and the second terminal of the first resistor R1 is connected to the inverting input terminal b; the first terminal of the second capacitor C2 is connected to the first terminal of the first resistor R1, and the second terminal of the second capacitor C2 is grounded; the first terminal of the second resistor R2 is connected to the first terminal of the first resistor R1 and the inverting input terminal b, and the second terminal of the second resistor R2 is connected to the output terminal c of the operational amplifier unit 3; the first terminal of the third capacitor C3 is connected to the first terminal of the second resistor R2, the first terminal of the first resistor R1, and the inverting input terminal b, and the second terminal of the third capacitor C3 is connected to the second terminal of the second resistor R2.

[0058] Specifically, the first capacitor C1 acts as a coupling capacitor, ensuring that only AC audio signals can pass through. The second capacitor C2 and the third capacitor C3 improve the stability and anti-interference capability of the gain unit 3. The upper limit of the amplification capability of the operational amplifier circuit 30 depends on the gain unit 1. The amplification factor AMP of the gain unit 1 can be obtained by formula 1, where R1 is the resistance value of the first resistor and R2 is the resistance value of the second resistor.

[0059] Formula 1: AMP = R2 / R1

[0060] In some embodiments, as shown in FIG. 2, the filter unit 2 includes a third resistor R3, a fourth capacitor C4 and a fifth capacitor C5. Figure 4

[0061] The first end of the third resistor R3 is connected to the bias signal, and the second end of the third resistor R3 is connected to the positive input end a. The first end of the fourth capacitor C4 is connected to the second end of the third resistor R3, and the second end of the fourth capacitor C4 is grounded. The first end of the fifth capacitor C5 is connected to the second end of the third resistor R3 and the positive input end a, and the second end of the fifth capacitor C5 is connected to the first end of the third resistor R3.

[0062] Specifically, the third resistor R3 and the fourth capacitor C4 remove high-frequency noise by using low-pass filtering characteristics, and the fifth capacitor C5 further provides high-frequency suppression.

[0063] In some embodiments, as shown in FIG. 2, the filter unit 2 includes a third resistor R3, a fourth capacitor C4 and a fifth capacitor C5. Figure 4

[0064] The first end of the fourth resistor R4 is connected to the output end c of the operational amplifier unit 3 and the second output end of the gain unit 1, and the second end of the fourth resistor R4 is used to output the amplified microphone signal. The first end of the sixth capacitor C6 is connected to the second end of the fourth resistor R4, and the second end of the sixth capacitor C6 is grounded. The first end of the fifth resistor R5 is connected to the first end of the sixth capacitor C6 and the second end of the fourth resistor R4, and the second end of the fifth resistor R5 is grounded.

[0065] Specifically, the filter unit 2 removes high-frequency noise by using low-pass filtering characteristics, and the fifth capacitor C5 further provides high-frequency suppression.

[0066] In some embodiments, as shown in FIG. 2, the filter unit 2 includes a third resistor R3, a fourth capacitor C4 and a fifth capacitor C5. Figure 4

[0067] The first end of the seventh capacitor C7 is connected to the positive input end a and the output end of the filter unit 2, and the second end of the seventh capacitor C7 is connected to the negative input end b and the first output end of the gain unit 1.

[0068] Specifically, the seventh capacitor C7 forms a cross capacitor between the positive input end a and the negative input end b, which can cancel the common-mode signal between the positive input end a and the negative input end b.

[0069] In some embodiments, the input end of the switching module 200 is connected to the left channel output end of the audio input interface 100.​​​

[0070] Specifically, the switching module 200 can control the left channel audio signal from the audio input interface 100 to output to the AUX signal loop or the microphone signal loop according to the user demand, so as to realize the AUX function and the K song function, and it should be noted that, as shown in Figure 5 (a) and Figure 5 (b) show, Figure 5 (a) is the definition diagram of the AUX interface, Figure 5 (b) is the definition diagram of the microphone interface, the definitions of the two interfaces are different except L, so the switching module 200 selectively turns on the AUX signal loop or the microphone signal loop, if the switching module 200 turns on the AUX signal loop, the left channel audio signal from the audio input interface passes through the second static contact point B, the third moving contact point B1 and the second moving contact point A1 and then reaches the first static contact point A for output; if the switching module 200 turns on the microphone signal loop, the right channel output end of the audio input interface is directly connected to the GND end of the microphone plug-in, no audio signal is input, the L end of the microphone plug-in is connected to the left channel output end of the audio input interface 100, and the microphone signal passes through the second static contact point B, the fourth moving contact point B2, the operational amplifier circuit 30 and the second moving contact point A2 and then reaches the first static contact point A for output.

[0071] The second aspect embodiment of the utility model provides an audio system 2000, as shown in Figure 4 The audio system 2000 comprises an audio device 1000.

[0072] According to the audio system 2000 provided by the utility model embodiment, the AUX and K song functions are integrated in the audio device 100, and the switching can be selectively performed, so that the time delay and audio distortion problems of the K song function are solved while the cost is reduced.

[0073] In some embodiments, as shown in Figure 4 The audio system 2000 comprises a master control chip 300.

[0074] The master control chip 300 is connected with the audio device 1000, and the master control chip 300 is used for controlling the switching module 200 of the audio device 1000 to turn on the AUX signal loop when it is detected that the plug-in is accessed and no K song starting signal is received, or controlling the switching module 200 of the audio device 1000 to turn on the microphone signal loop when it is detected that the plug-in is accessed and the K song starting signal is received.

[0075] Specifically, the master control chip 300 can detect whether the plug-in is connected. Taking the AUX plug-in as an example, the detection pin of the AUX plug-in is provided with a 3.3V pull-up resistor on the circuit board. When there is no plug-in connected, the pull-up resistor is in a high level by default. When the plug-in is connected, the detection pin is directly grounded to pull down the level of the detection pin, so that the master control chip 300 can detect that the plug-in is connected by obtaining a low level signal. The detection method of the microphone plug-in used for karaoke function is the same as that of the AUX plug-in, which will not be described here. When the master control chip 300 detects that the plug-in is connected and receives a karaoke starting signal, it controls the switching module 200 of the audio device 1000 to turn on the microphone signal loop. The master control chip 300 can be set to control the switching module 200 to turn on the AUX signal loop by default when it detects that the plug-in is connected, and control the switching module 200 to turn on the microphone signal loop after receiving the karaoke starting signal.

[0076] In some embodiments, as shown in FIG. 2, the audio system 2000 includes a digital signal processing chip 400. Figure 4

[0077] The digital signal processing chip 400 is connected with the output end of the switching module 200 and the left channel output end of the audio input interface 100 in the audio device 1000. The digital signal processing chip 400 is used for mixing the AUX signal or the microphone signal to obtain a digital audio signal.

[0078] Specifically, the AUX signal includes a left channel audio signal and a right channel audio signal. The left channel audio signal is directly sent to the digital signal processing chip 400 from the right channel output end of the audio input interface 100, and the left channel audio signal is sent to the digital signal processing chip 400 from the left channel output end of the audio input interface 100 through the AUX signal loop. The digital signal processing chip 400 mixes the left channel audio signal and the right channel audio signal. Before being sent to the digital signal processing chip 400, the left channel audio signal and the right channel audio signal are not processed to ensure the consistency and high fidelity of the left channel audio signal and the right channel audio signal. The microphone signal is amplified by the left channel output end of the audio input interface 100 through the microphone signal loop and then sent to the digital signal processing chip 400. The digital signal processing chip 400 mixes the amplified microphone signal and the background audio signal and the audio signal of the karaoke performance. The digital audio signal can be used for audio signal transmission, sound playing or karaoke scoring, which is not limited here. It should be noted that the amplified microphone signal does not need to be amplified after entering the digital signal processing chip 400. Since the signal integrity is good, the digital signal processing chip 400 does not need to perform too much algorithm processing, thereby releasing the computing power of the digital signal processing chip 400.

[0079] ​In some embodiments, as shown in Figure 4 The audio system 2000 includes the karaoke system processing chip 500.

[0080] The karaoke system processing chip 500 is connected with the digital signal processing chip 400, and the karaoke system processing chip 500 is configured to receive the digital audio signal sent by the digital signal processing chip 400 and send the accompaniment signal to the digital signal processing chip 400.

[0081] Specifically, the digital signal processing chip 400 is configured to receive the accompaniment signal, mix the amplified microphone signal and the accompaniment signal, and the karaoke system processing chip 500 is configured to score according to the digital audio signal.

[0082] In some embodiments, as shown in Figure 4 The audio system 2000 includes the sound equipment 600.

[0083] The sound equipment 600 is connected with the digital signal processing chip 400, and the sound equipment 600 is configured to play the sound according to the digital audio signal sent by the digital signal processing chip 400.

[0084] Specifically, if the user starts the AUX function, the digital signal processing chip 400 plays the sound of the left channel audio signal and the right channel audio signal through the sound equipment 600; if the user starts the karaoke function, the digital signal processing chip 400 plays the sound of the amplified microphone signal and the accompaniment signal through the sound equipment 600.

[0085] The third aspect of the utility model provides a vehicle 3000, as shown in Figure 6 The vehicle 3000 includes the audio system 2000, the audio system 2000 integrates the AUX and the karaoke function, and can selectively switch, thereby reducing the cost and solving the time delay and the audio distortion problem of the karaoke function.

[0086] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example.

[0087] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An audio device, comprising: The application relates to an audio input interface, a switching module and an audio input circuit. The audio input interface is connected with an audio input interface, and the switching module is connected with an audio input interface. The switching module comprises a first switch, a second switch, an operational amplifier circuit and a common-mode rejection circuit.

2. The audio apparatus of claim 1, wherein, The first switch comprises a first static contact, a first dynamic contact and a second dynamic contact. The second switch comprises a second static contact, a third dynamic contact and a fourth dynamic contact. The first static contact is connected with the output terminal of the audio input interface. The third dynamic contact is connected with the first dynamic contact.

3. The audio apparatus of claim 2, wherein, The fourth dynamic contact is connected with the second dynamic contact. The second static contact is connected with the third dynamic contact and the fourth dynamic contact.

4. The audio apparatus of claim 3, wherein, The first static contact, the first dynamic contact, the third dynamic contact and the second static contact form an AUX signal loop. The first static contact, the second dynamic contact, the fourth dynamic contact and the second static contact form a microphone signal loop. The operational amplifier circuit is connected between the second dynamic contact and the fourth dynamic contact. The operational amplifier circuit is used for amplifying the microphone signal when the microphone signal loop is turned on. The operational amplifier circuit comprises a gain unit, a filter unit, an operational amplifier unit and a common-mode rejection unit. The gain unit is connected with the second dynamic contact.

5. The audio apparatus of claim 4, wherein, The filter unit is connected with a bias signal. The operational amplifier unit is connected with the first output terminal of the gain unit and the output terminal of the filter unit. The common-mode rejection unit is connected with the positive input terminal and the output terminal of the filter unit and the negative input terminal and the first output terminal of the gain unit. The operational amplifier circuit further comprises a voltage dividing unit. The voltage dividing unit is connected with the output terminal of the operational amplifier unit. The gain unit comprises a first capacitor, a first resistor, a second capacitor and a second resistor. The first capacitor is connected with the second dynamic contact. The first resistor is connected with the second end of the first capacitor and the negative input terminal. The second capacitor is connected with the first end of the first resistor and grounded. The second resistor is connected with the first end of the first resistor, the negative input terminal and the output terminal of the operational amplifier unit. The filter unit comprises a first inductor and a second inductor. The first inductor is connected with the first end of the second capacitor. The second inductor is connected with the second end of the second capacitor. The operational amplifier unit comprises a third capacitor and a fourth capacitor. The third capacitor is connected with the output terminal of the filter unit. The fourth capacitor is connected with the output terminal of the gain unit. The common-mode rejection unit comprises a first resistor, a second resistor and a third resistor. The first resistor is connected with the output terminal of the filter unit and the positive input terminal. The second resistor is connected with the output terminal of the filter unit and the negative input terminal. The third resistor is connected with the output terminal of the filter unit and the positive input terminal. The voltage dividing unit comprises a third resistor and a fourth resistor. The third resistor is connected with the output terminal of the operational amplifier unit. The fourth resistor is connected with the output terminal of the operational amplifier unit and the output terminal of the audio input interface. The third resistor and the fourth resistor are connected with the output terminal of the audio input interface. A third capacitor, a first end of the third capacitor being connected with a first end of the second resistor, a first end of the first resistor, and the reverse input end, a second end of the third capacitor being connected with a second end of the second resistor.

6. The audio apparatus of claim 4, wherein, The filter unit comprises: A third resistor, a first end of the third resistor being connected with a bias signal, a second end of the third resistor being connected with the forward input end; A fourth capacitor, a first end of the fourth capacitor being connected with the second end of the third resistor, a second end of the fourth capacitor being grounded; A fifth capacitor, a first end of the fifth capacitor being connected with the second end of the third resistor and the forward input end, a second end of the fifth capacitor being connected with the first end of the third resistor.

7. The audio device of claim 4, wherein, The voltage division unit comprises: A fourth resistor, a first end of the fourth resistor being connected with an output end of the operational amplifier unit and a second output end of the gain unit, a second end of the fourth resistor being used for outputting the amplified microphone signal; A sixth capacitor, a first end of the sixth capacitor being connected with the second end of the fourth resistor, a second end of the sixth capacitor being grounded; A fifth resistor, a first end of the fifth resistor being connected with the first end of the sixth capacitor and the second end of the fourth resistor, a second end of the fifth resistor being grounded.

8. The audio apparatus of claim 4, wherein, The common mode rejection unit comprises: A seventh capacitor, a first end of the seventh capacitor being connected with the forward input end and an output end of the filter unit, a second end of the seventh capacitor being connected with the reverse input end and a first output end of the gain unit.

9. The audio apparatus of any of claims 1-8, wherein, An input end of the switching module is connected with a left channel output end of the audio input interface.

10. An audio system, characterized by The audio device comprises any one of claims 1-9.

11. The audio system of claim 10, wherein, The audio system further comprises: A master control chip, the master control chip being connected with the audio device, the master control chip being used for controlling a switching module of the audio device to turn on the AUX signal loop when it is detected that the plug-in is accessed and no karaoke starting signal is received, or, controlling the switching module of the audio device to turn on the microphone signal loop when it is detected that the plug-in is accessed and a karaoke starting signal is received.

12. The audio system of claim 10 or 11, characterized in that, The audio system further comprises: A digital signal processing chip, the digital signal processing chip being connected with an output end of the switching module and a left channel output end of the audio input interface in the audio device, the digital signal processing chip being used for mixing the AUX signal or the microphone signal to obtain a digital audio signal.

13. The audio system of claim 12, wherein, The audio system further comprises: A karaoke system processing chip, the karaoke system processing chip being connected with the digital signal processing chip, the karaoke system processing chip being used for receiving the digital audio signal sent by the digital signal processing chip, and further being used for sending a sound accompaniment signal to the digital signal processing chip.

14. The audio system of claim 12, wherein, The audio system further comprises: A sound equipment, the sound equipment being connected with the digital signal processing chip, the sound equipment being used for playing sound according to the digital audio signal sent by the digital signal processing chip.

15. A vehicle characterized by comprising: The audio system comprises any one of claims 10-14.

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