Vehicle-mounted noise-cancelling microphone assembly and vehicle-mounted noise-cancelling microphone

Abstract

An embodiment of the present invention discloses a vehicle-mounted noise reduction microphone assembly, which is applied to the field of electronic technology. The vehicle-mounted noise reduction microphone assembly includes a microphone mounting bracket, and a first microphone and a second microphone that output opposite waveform signals. The sound receiving angles of the first microphone and the second microphone are adjustable. The microphone mounting bracket is fixedly installed in a vehicle operating console. The microphone mounting bracket has an adjustable spacing structure. The first microphone and the second microphone are respectively installed at the left and right ends of the adjustable spacing structure. A vehicle-mounted noise reduction microphone is also disclosed. The vehicle-mounted noise reduction microphone assembly and the vehicle-mounted noise reduction microphone can improve the sound receiving effect.

Description

Technical Field

[0001] The invention belongs to the field of electronic technology, and in particular relates to a vehicle-mounted noise reduction microphone assembly and a vehicle-mounted noise reduction microphone. Background Art

[0002] With the rapid development of in-vehicle multimedia technology, more and more cars are equipped with microphones, which are structures that receive sound. They transmit the vibration of sound to the microphone diaphragm, pushing the magnet inside to form a changing current. This changing current is sent to the sound processor at the back for amplification. The microphone will collect any signal that causes the microphone diaphragm to vibrate, causing the collected sound signal to be mixed with noise.

[0003] All passenger cars have four types of noise: vehicle noise, wind noise, road noise, and electrical noise, which interfere with in-vehicle communication equipment and in-vehicle voice equipment, resulting in poor call quality and low voice recognition rate. Summary of the invention

[0004] The invention provides a vehicle-mounted noise reduction microphone assembly and a vehicle-mounted noise reduction microphone, aiming to solve the problems of poor sound receiving effect and low speech recognition rate of existing vehicle-mounted microphones.

[0005] An embodiment of the present invention provides a vehicle-mounted noise reduction microphone assembly, comprising: a microphone mounting bracket, and a first microphone and a second microphone that output opposite waveform signals, wherein the sound receiving angles of the first microphone and the second microphone are adjustable;

[0006] The microphone mounting bracket is fixedly installed in the vehicle operating table. The microphone mounting bracket has an adjustable spacing structure. The first microphone and the second microphone are respectively mounted on the left and right ends of the adjustable spacing structure.

[0007] An embodiment of the present invention further provides a vehicle-mounted noise reduction microphone, comprising the vehicle-mounted noise reduction microphone assembly as described above.

[0008] It can be seen from the above-mentioned embodiments of the present invention that the vehicle-mounted noise reduction microphone assembly includes a microphone mounting bracket, and a first microphone and a second microphone that output opposite waveform signals. The output signals of the first microphone and the second microphone are opposite, which can offset the relatively weak signals therebetween, thereby improving the clarity of the sound reception and achieving a good voice processing effect. The sound reception angles of the first microphone and the second microphone are adjustable, and the microphone mounting bracket has an adjustable spacing structure. The first microphone and the second microphone are respectively installed at the left and right ends of the adjustable spacing structure. The spacing and angle of the two microphones are adjustable, thereby improving the sound reception effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0010] Figure 1 is a schematic diagram of the hardware structure of a vehicle-mounted noise reduction microphone assembly provided by an embodiment of the present invention;

[0011] Figure 2 is a schematic diagram of a working scenario of a vehicle-mounted noise reduction microphone assembly provided by an embodiment of the present invention;

[0012] Figure 3 It is a schematic diagram of the circuit structure of the microphone in the vehicle-mounted noise reduction microphone assembly provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0013] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0014] See also Figure 1 , Figure 1 The hardware structure diagram of the vehicle-mounted noise reduction microphone assembly of this embodiment is shown in FIG. 1 . The vehicle-mounted noise reduction microphone assembly is suitable for a vehicle-mounted microphone, and is used to collect sound signals during the movement of a vehicle or other means of transportation to realize voice calls. The vehicle-mounted noise reduction microphone assembly mainly includes:

[0015] The microphone mounting bracket 10, as well as the first microphone 20 and the second microphone 30 that output opposite waveform signals, the first microphone 20 and the second microphone 30 have adjustable sound receiving angles. The user can adjust the two microphones to the best sound receiving angle facing himself, thereby improving the sound receiving effect, thereby improving the voice recognition rate and improving the call quality.

[0016] The microphone mounting bracket 10 is fixedly mounted on an operating table at the front end of a vehicle or other transportation tool. The microphone mounting bracket 10 has an adjustable spacing structure. The first microphone 20 and the second microphone 30 are respectively mounted on the left and right ends of the adjustable spacing structure. Figure 1 The two reverse arrows in the figure indicate that the spacing-adjustable structure can be pulled apart in reverse directions.

[0017] Further, the first microphone 20 and the second microphone 30 are drain output and source output, respectively, that is, one of the first microphone 20 and the second microphone 30 is a drain output microphone, and the other is a source output microphone. The embodiments of the present invention take the first microphone 20 as a drain output and the second microphone 30 as a source output as an example. The drain output microphone outputs a forward wave, and the source output microphone outputs a reverse wave.

[0018] Specifically, the spacing adjustable structure includes two movable pull rods on the left and right, namely Figure 2 The left movable rod 11 and the right movable rod 12 are respectively provided with a first microphone 20 and a second microphone 30 at both ends of the two movable rods. The two movable rods have a fixed installation end 13 arranged at the center position of the microphone mounting bracket 10 as a base end, and have left and right stretchability respectively.

[0019] More specifically, the stretchability in the left and right directions can be realized by a spring and a plurality of spring positions, that is, the two movable pull rods are pulled apart to the left and right ends respectively by the tension of the springs, and the two movable pull rods can be fixed in the spring positions at each spring position, thereby fixing the distance between the two movable pull rods, so that the sound receiving position and sound receiving angle of the first microphone 20 and the second microphone 30 are respectively facing the main driver's seat and the co-driver's seat, and are used to collect the sound signals of the users sitting in the main driver's seat and the co-driver's seat respectively, thereby improving the quality of sound reception. The distance between the main driver's seat and the co-driver's seat is different for different types and models of vehicles, and setting the distance between the first microphone 20 and the second microphone 30 to be adjustable can improve the adaptability of the two microphones and improve the intelligence of sound reception.

[0020] Furthermore, the first microphone 20 and the second microphone 30 both include a signal stabilization module and a three-stage anti-interference filtering module. The signal stabilization module is used to stabilize the sound signals collected by the first microphone 20 and the second microphone 30; the three-stage anti-interference filtering module includes three anti-interference filtering modules, which are respectively used to filter 2.4G interference, mobile terminal frequency interference and digital frequency interference.

[0021] Specifically, see Figure 3 , Figure 3 MIC1 and MIC2 in the figure are two forward and reverse bipolar microphones, and MIC1 is taken as the first microphone 20 and MIC2 is taken as the second microphone 30. Similarly, MIC1 can also be the second microphone 30 and MIC2 can be taken as the first microphone 20. Both MIC1 and MIC2 include a stabilization module and a three-level anti-interference module. For ease of description, the stabilization module and the three-level anti-interference module in MIC1 are taken as an example for explanation, and the stabilization module and the three-level anti-interference module in MIC2 are the same.

[0022] The stabilization module includes: a first transistor Q1, a first resistor R7, a second resistor R2, a third resistor R3 and a second transistor Q2; the emitter of Q1 is connected to one end of R7, the other end of R7 is connected to one end of R2 and one end of R3, the other end of R2 is connected to the base of Q2, and the collector of Q2 is connected to the base of Q1.

[0023] The three-stage anti-interference filtering module includes a first filtering module for filtering out 2.4G interference, a second filtering module for filtering out mobile terminal (specifically, a mobile phone) frequency interference, and a third filtering module for filtering out digital frequency interference;

[0024] The first filtering module includes a first capacitor C1 and a second capacitor C2, forming a C filter; one end of C1 and one end of C2 are both connected to the input end of the microphone, and the other end of C1 and the other end of C2 are both grounded.

[0025] The second filtering module includes a fourth resistor R5, a fifth resistor R11, a third capacitor C8, a first inductor L0 and a fourth capacitor C10, forming an RLC filter;

[0026] One end of R5 is connected to the input end of the microphone, one end of C1 and one end of C2, the other end of R5 is connected to one end of R11, the other end of R11 is connected to C8 and one end of L0, and the other end of L0 is connected to C10.

[0027] The third filtering module includes: a sixth resistor R12, a fourth capacitor C12, a fifth capacitor C13 and a sixth capacitor C14, forming a π-type filter;

[0028] One end of R12 is connected to one end of R11, the other end of R12 is connected to one end of C12, C13 and C14, and the other ends of C12 and C13 are grounded.

[0029] In the above circuit diagram, the signal input from MIC1 enters the base of transistor Q1 through R5 and C0 for signal amplification. The signal amplified by Q1 is divided into two paths: one path is output to the external circuit through the collector stage of Q1 and C15; the other path is fed back and output between R7 and R2 of the emitter of Q1. This is a negative feedback control signal, which is input to the base of transistor Q2 through R3 to control the on-resistance of Q2. If the signal output by MIC1 to C0 is too strong, the emitter voltage of Q1 will also increase. The increased voltage is transmitted to the base of Q2 through the feedback circuit, and the on-resistance of Q2 becomes smaller. The signal on C0 is pulled down by the on-resistance, and the signal sent to Q1 is also reduced, thereby controlling the signal strength reaching Q1, stabilizing the output strength of MIC1, and improving stability.

[0030] The working principle of the vehicle-mounted noise reduction microphone assembly in this embodiment:

[0031] The microphone mounting bracket is fixedly installed in the vehicle operating console. The microphones at both ends of the microphone mounting bracket have one drain output and the other source output. They start to receive sound at the same time and receive the same signal. The signals they output are opposite. When the user in the main driver's seat speaks, the sound signal received by the first microphone facing the main driver's seat is stronger than the sound signal received by the second microphone facing the co-pilot seat. The sound signals received by the two microphones have opposite polarities and reverse waveforms, so the weak sound signals are offset. When the sound signal reaches the output end, only the sound signal of the first microphone is retained; conversely, when the user in the co-pilot seat speaks, the sound signal received by the second microphone is stronger, so the sound signal received by the first microphone is offset, and only the sound signal of the second microphone is retained at the output end.

[0032] In this embodiment, the vehicle-mounted noise reduction microphone assembly includes a microphone mounting bracket, and a first microphone and a second microphone that output opposite waveform signals. The output signals of the first microphone and the second microphone are opposite, which can offset the relatively weak signals therebetween, thereby improving the clarity of the sound reception and achieving good voice processing effects. The sound reception angles of the first microphone and the second microphone are adjustable, and the microphone mounting bracket has an adjustable spacing structure. The first microphone and the second microphone are respectively mounted on the left and right ends of the adjustable spacing structure. The spacing and angle of the two microphones are adjustable, thereby improving the sound reception effect.

[0033] This embodiment also provides a vehicle-mounted noise reduction microphone, including the vehicle-mounted noise reduction microphone assembly as described above.

[0034] The vehicle-mounted noise reduction microphone in this example includes a microphone mounting bracket, and a first microphone and a second microphone that output opposite waveform signals. The output signals of the first microphone and the second microphone are opposite, which can offset the relatively weak signals therebetween, thereby improving the clarity of the sound reception and achieving good voice processing effects. The sound reception angles of the first microphone and the second microphone are adjustable, and the microphone mounting bracket has an adjustable spacing structure. The first microphone and the second microphone are respectively mounted on the left and right ends of the adjustable spacing structure. The spacing and angle of the two microphones are adjustable, thereby improving the sound reception effect.

[0035] The above is a description of the vehicle-mounted noise reduction microphone assembly and the vehicle-mounted noise reduction microphone provided by the present invention. For those skilled in the art, according to the ideas of the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A vehicle-mounted noise reduction microphone assembly, characterized in that: include: A microphone mounting bracket, and a first microphone and a second microphone outputting waveform signals in opposite directions, wherein the sound receiving angles of the first microphone and the second microphone are adjustable; The microphone mounting bracket is fixedly installed in the vehicle operating table, the microphone mounting bracket has an adjustable spacing structure, and the first microphone and the second microphone are respectively installed at the left and right ends of the adjustable spacing structure; Wherein, the first microphone and the second microphone are respectively a drain output and a source output; The adjustable spacing structure comprises two left and right movable pull rods, the first microphone and the second microphone are respectively arranged at the two ends of the two movable pull rods, and the two movable pull rods have a fixed installation end arranged at the center of the microphone mounting bracket as a base end, and have left and right stretchability respectively, wherein the movable pull rod realizes the left and right stretchability by a spring and a plurality of spring clamps; The sound receiving positions and sound receiving angles of the first microphone and the second microphone are respectively facing the main driving seat and the co-driving seat of the vehicle; The first microphone and the second microphone both include a signal stabilization module and a three-stage anti-interference filtering module; The signal stabilization module is used to stabilize the sound signals collected by the first microphone and the second microphone; The three-stage anti-interference filtering module is used to filter 2.4G interference, mobile terminal frequency interference and digital frequency interference respectively.

2. The vehicle-mounted noise reduction microphone assembly according to claim 1, characterized in that: The signal stabilization module comprises: a first transistor, a first resistor, a second resistor, a third resistor and a second transistor; The emitter of the first transistor is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the second resistor and one end of the third resistor, the other end of the second resistor is connected to the base of the second transistor, and the collector of the second transistor is connected to the base of the first transistor.

3. The vehicle-mounted noise reduction microphone assembly according to claim 2, characterized in that: The three-stage anti-interference filtering module includes a first filtering module; The first filtering module includes a first capacitor and a second capacitor, one end of the first capacitor and one end of the second capacitor are connected to the input end of the microphone, and the other end of the first capacitor and the other end of the second capacitor are grounded.

4. The vehicle-mounted noise reduction microphone assembly according to claim 3, characterized in that: The three-stage anti-interference filtering module includes a second filtering module; The second filtering module includes a fourth resistor, a fifth resistor, a third capacitor, a first inductor and a fourth capacitor; One end of the fourth resistor is connected to one end of the first capacitor, the other end of the fourth resistor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the third capacitor and one end of the first inductor, and the other end of the first inductor is connected to the fourth capacitor.

5. The vehicle-mounted noise reduction microphone assembly according to claim 4, characterized in that: The three-stage anti-interference filtering module includes a third filtering module; The third filtering module includes: a sixth resistor, a fourth capacitor, a fifth capacitor and a sixth capacitor; One end of the sixth resistor is connected to one end of the fifth resistor, and the other end is connected to one end of the fourth capacitor, one end of the fifth capacitor and one end of the sixth capacitor.

6. A vehicle-mounted noise reduction microphone, characterized in that: It comprises the vehicle-mounted noise reduction microphone assembly as described in any one of claims 1 to 5.

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