CN210469717U

CN210469717U - Pickup device

Info

Publication number: CN210469717U
Application number: CN201921244690.XU
Authority: CN
Inventors: 高素云; 赵湘; 付中华; 王海坤
Original assignee: iFlytek Co Ltd
Current assignee: iFlytek Co Ltd
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-05-05
Anticipated expiration: 2029-08-02

Abstract

The utility model discloses a pickup device, which comprises a pickup assembly and a sound cover; a sound pickup cavity is arranged on the sound cover, and the sound pickup assembly is arranged in the sound pickup cavity; one side of the sound-collecting cavity is provided with a sound-collecting port, and the section of the sound-collecting cavity is gradually enlarged along the direction towards the sound-collecting port. The utility model discloses can realize picking up more target pronunciation under the remote condition, reduce the difficulty that follow-up algorithm handled.

Description

Pickup device

Technical Field

The utility model relates to a speech enhancement technical field, especially one kind is applicable to remote microphone array pickup apparatus.

Background

The voice enhancement technology is one of important technologies of systems such as voice interaction and the like, and under an actual complex acoustic environment, target voice picked by a microphone is usually interfered by noise and the like, so that the voice intelligibility is reduced, and the performance of a voice interaction system is degraded. The microphone array integrates the space-time information of the voice signals, has the characteristics of flexible beam control, good spatial resolution, good anti-interference capability and the like, and becomes a research hotspot of voice enhancement.

In the existing microphone array pickup scheme, microphone arrays with different topological structures are generally used, sound pressure change in space is directly sampled, and then enhancement processing is carried out on acquired target voice.

The sound picked by the microphone mainly comprises target voice, environmental noise and the like, the target voice is greatly attenuated under the long-distance (more than 30 meters) condition, the signal-to-noise ratio is too low, the background noise of the array can also generate certain influence, and finally the target voice information loss is large. How to pick up more target voices in a long distance is one of the important problems that the skilled person needs to solve urgently.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a pickup device to solve the technical problem among the prior art, it can realize picking up more target pronunciation under the remote condition, reduces the difficulty that follow-up algorithm handled.

The utility model provides a pickup device, which comprises a pickup assembly and a sound cover;

a sound pickup cavity is arranged on the sound cover, and the sound pickup assembly is arranged in the sound pickup cavity;

one side of the sound-collecting cavity is provided with a sound-collecting port, and the section of the sound-collecting cavity is gradually enlarged along the direction towards the sound-collecting port.

The sound pickup apparatus as described above, wherein optionally, the sound pickup assembly includes a mount and a microphone;

the mounting seat is mounted at the bottom of the sound-collecting cavity;

the number of the microphones is multiple, and the microphones are installed on the installation seat.

The sound pickup device as described above, wherein optionally, the mounting base is cylindrical, and one end of the mounting base is connected to the bottom of the sound pickup cavity;

the central line of the mounting seat is superposed with the central line of the sound-collecting cavity;

the microphones are distributed on the periphery of the mounting seat.

The sound pickup apparatus as described above, wherein optionally, the number of the microphones is 6 to 24.

The sound pickup device as described above, wherein optionally, the mounting base is a cylindrical structure, and the plurality of microphones are uniformly distributed on the outer circumference of the cylindrical structure.

The sound pickup apparatus as described above, wherein optionally the sound pickup cavity is a conical bore.

The sound pickup apparatus as described above, wherein optionally the sound cover includes a first cover body and a second cover body;

one side of the first cover body is provided with a taper hole; the second cover body is provided with a through hole, and the diameter of the through hole is gradually increased or decreased along the axial direction of the through hole;

the second cover body is connected with one end of the second cover body, and the taper hole is communicated with the through hole to form the taper hole.

The sound pickup device as described above, wherein optionally, a first nesting portion is provided on the first cover, and a second nesting portion is provided on the second cover; the first nesting part is connected with the second nesting part in a nesting mode.

The sound pickup apparatus as described above, wherein, optionally, bolts are connected between the first nesting portion and the second nesting portion, the number of the bolts is plural, and the plural bolts are uniformly distributed along the outer periphery of the second nesting portion.

The sound pickup device as described above, wherein optionally, the size of the vertex angle of the conical hole is 30 degrees to 90 degrees.

The sound pickup device as described above, optionally, the sound pickup device further includes a bracket, the bracket includes a side plate and a bottom plate, one of the side plates is provided with a through groove, and the side plate with the through groove is provided with a bolt hole, and the side plate and the sound cover are connected by a bolt at an end far away from the sound pickup opening.

Compared with the prior art, the utility model discloses an install the pickup subassembly in the pickup intracavity of sound cover to set the pickup chamber to the cross-section along the orientation the direction grow gradually of pickup mouth. So, when using, with the pickup mouth towards the sound source, after target sound wave got into the pickup cavity, constantly reflect on the inner wall in pickup cavity to play the effect of gathering sound, make the pickup subassembly that is located the pickup cavity can receive more target sound wave signals. Meanwhile, the sound cover can shield noise in the direction of a non-sound source, so that the signal to noise ratio of the received signal can be improved, and the difficulty of a subsequent processing algorithm is favorably reduced.

Drawings

Fig. 1 is a perspective view of a sound pickup apparatus according to an embodiment of the present invention;

fig. 2 is a perspective view of the first cover body according to the present invention;

fig. 3 is a perspective view of a second cover body according to the present invention;

fig. 4 is a perspective view of the bracket according to the present invention;

fig. 5 is a parameter diagram of a sound pickup apparatus used in test example 1 of the present invention;

fig. 6 is a graph of acoustic amplitude versus frequency obtained in test example 2.

Description of reference numerals:

1-a pickup assembly, 2-a sound cover and 3-a bracket;

11-mount, 12-microphone;

21-sound-collecting cavity, 22-first cover body, 23-second cover body;

221-conical bore, 222-first nest;

231-through hole, 232-second nesting part;

31-side plate, 32-bottom plate;

311-through groove.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

Example 1

Referring to fig. 1, the present embodiment discloses a sound pickup apparatus, which includes a sound pickup assembly 1 and a sound cover 2; the sound pick-up assembly 1 is arranged to receive sound waves entering the sound enclosure 2. The sound enclosure 2 is arranged to shield against interference to improve the signal-to-noise ratio of sound waves received by the sound pickup assembly 1.

A sound-collecting cavity 21 is arranged on the sound cover 2, and the sound-collecting component 1 is installed in the sound-collecting cavity 21. One side of the sound-collecting cavity 21 is provided with a sound-collecting opening, and the section of the sound-collecting cavity 21 is gradually enlarged along the direction towards the sound-collecting opening. In practical implementation, the cross section of the sound-collecting cavity 21 may be a polygonal structure, such as: quadrilateral, pentagonal, hexagonal, octagonal, etc. The sectional shape of the sound-collecting chamber 21 is not limited in the present embodiment. As long as the section of the sound-collecting cavity 21 becomes gradually larger by satisfying the condition in the direction toward the sound-collecting port.

During the specific use, be connected the back with pickup apparatus and speech processing equipment, when needs remote pick-up sound, with the pickup mouth on the pickup cavity 21 towards the target sound source, after sound enters into pickup cavity 21 by the pickup mouth, can take place the reflection on the inner wall in pickup cavity 21, sound after the reflection can continue to propagate to the inside in pickup cavity 21, can play the effect of gathering sound, is favorable to improving the gain of target direction sound wave signal. Meanwhile, due to the arranged sound pickup cavity 21, sound wave signals in a non-target direction are difficult to enter the sound pickup cavity 21, so that signals in other directions can be shielded. Therefore, the signal-to-noise ratio can be improved to the maximum extent, and the algorithm processing of subsequent signals is facilitated.

In a preferred embodiment, the pickup assembly 1 includes a mounting base 11 and a microphone 12. The mount 11 is used to arrange a microphone 12. The mounting seat 11 mounts the bottom of the sound-collecting chamber 21. In specific implementation, the mounting seat 11 may be directly mounted at the bottom of the sound-collecting cavity 21, or may be mounted at the bottom of the sound-collecting cavity 21 through other components. During specific implementation, the connection mode can be welding, bolt connection, clamping connection or other conventional connection modes. In use, since the section of the sound-collecting cavity 21 is gradually increased in the direction toward the sound-collecting opening, the sound-collecting function of the sound-collecting cavity 21 is improved, and the microphone 12 at the bottom of the sound-collecting cavity 21 can receive stronger sound signals. That is, when the sound wave enters the sound pickup cavity 21, the sound wave is reflected by the inner wall of the sound pickup cavity 21 and continues to propagate in the direction toward the bottom of the sound pickup cavity 21 after being reflected, so that more sound wave signals can be propagated to the bottom of the sound pickup cavity 21, and the intensity of the target sound signal can be improved.

The number of the microphones 12 is plural, and the plural microphones 12 are mounted on the mounting base 11. Specifically, the microphone 12 may be clamped on the mounting base 11, or may be embedded on the surface of the mounting base 11. By providing a plurality of microphones 12, more target sound signals can be obtained.

In a preferred embodiment, the mounting seat 11 is cylindrical, and one end of the mounting seat 11 is connected to the bottom of the sound-collecting cavity 21. In specific implementation, the mounting seat 11 may have a rectangular parallelepiped structure or a cylindrical structure. The center line of the mounting seat 11 coincides with the center line of the sound-collecting cavity 21. The plurality of microphones 12 are distributed on the outer periphery of the mount 11. Thus, in the process of reflecting the sound waves on the inner wall of the sound pickup cavity 21, the sound waves can continuously pass through the axial position of the sound pickup cavity 21, and thus, more target sound signals can be received. Specifically, the connection manner of the mounting seat 11 and the bottom of the sound-collecting cavity 21 may be welding, bolt connection, or other conventional connection manners.

In a preferred embodiment, the number of microphones 12 is 6-24. Wherein the number of the microphones 12 may be 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 or 24. Of course, the number of the microphones 12 is not only the number listed above, but also the number that can be selected by those skilled in the art as needed.

In a preferred embodiment, the mounting base 11 is a cylindrical structure, and the microphones 12 are uniformly distributed on the outer circumference of the cylindrical structure. In this way, uniform distribution of the microphones 12 on the outer periphery of the mounting seat 11 is facilitated, and reception of sound waves in the outer peripheral direction of the mounting seat 11 is facilitated.

In order to facilitate the transmission of signals, wire holes may be formed at the bottom of the mounting base 11 and the sound pickup cavity 21, so as to connect the sound pickup assembly 1 with an external sound processing device. Of course, the signal received by the sound pickup assembly 1 may also be transmitted to an external sound processing apparatus by wireless transmission. For those skilled in the art, the specific connection manner and setting manner thereof belong to the conventional technical means, and are not described herein again.

Example 2

The present embodiment proposes a sound pickup apparatus, and includes the contents of embodiment 1, except that:

referring to fig. 1 to 4, the sound-collecting cavity 21 in this embodiment is a conical hole. That is, the sound cover 2 is a cone-shaped sound cover 2, and since the cone-shaped sound cover 2 itself has a certain sound collecting capability, the sound collecting capability of the cone-shaped sound cover 2 is stronger than that of the irregular and smooth inner wall of the sound collecting cavity 21 in embodiment 1, and when sound is collected at a long distance, for example, a distance greater than 30 m, the gain of the target sound signal can be increased, and the cone-shaped sound cover 2 can block noise interference in other directions.

When the sound cavity 21 is in a cone-cylinder shape, unlike the situation that a general arc concave surface gathers sound at one point, the cone-cylinder sound cover 2 is used, so that the sound cover can generate sound gathering action at different positions in the sound cover, and therefore, a plurality of microphones are utilized to acquire more space-time information, the processing capacity of a subsequent signal processing algorithm is improved to the maximum extent, namely, the difficulty of the subsequent signal processing algorithm is favorably reduced.

In a preferred embodiment, the sound enclosure 2 includes a first enclosure 22 and a second enclosure 23. One side of the first cover body 22 is provided with a taper hole 221; the second cover 23 is provided with a through hole 231, and the diameter of the through hole 231 gradually increases or decreases along the axial direction thereof; the second cover 23 is connected to one end of the second cover 23, and the taper hole 221 is communicated with the through hole 231 to form the taper hole. That is, the first cover 22 and the second cover 23 contribute to the improvement of the sound collecting action by enlarging the sound cover 2. In a specific implementation, the number of the second cover 23 is one or more. In this way, the number of the second cover 23 can be increased or decreased according to actual needs to adapt to different needs. When the number of the second cover bodies 23 is multiple, the multiple second cover bodies 23 are connected in sequence and then connected with the first cover body 22 to form the large-size sound cover 2 with the conical hole. Specifically, the first cover 22 and the second cover 23 are connected by bolts, the number of the bolts is at least three, and the three bolts are uniformly distributed along the periphery of the first cover 22.

In a preferred embodiment, the first housing 22 is provided with a first nesting part 222, and the second housing 23 is provided with a second nesting part 232; the first nest 222 is nestingly connected with the second nest 232. Bolts are connected between the first nesting part 222 and the second nesting part 232, the number of the bolts is multiple, and the bolts are uniformly distributed along the periphery of the second nesting part 232. During specific implementation, be equipped with first connecting hole on the first nested portion 222, be equipped with the second connecting hole on the second nested portion 232, the nested portion 232 cover of second is established on the first nested portion 222, first connecting hole and second connecting hole one-to-one, just first connecting hole with correspond through bolted connection between the second connecting hole. Thus, the mounting and dismounting between the first cover 22 and the second cover 23 are facilitated. The size of the sound cover 2 can be changed according to the sound pickup requirement.

In a preferred embodiment, the size of the vertex angle of the conical hole is 30-90 degrees. Preferably, the size of the apex angle of the conical hole may be 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees, 85 degrees, or 90 degrees. Wherein, the size of the cone apex angle of the conical hole is 60 degrees as the best.

In other words, under a long distance, target information in the array pickup signal is less due to large attenuation of the target signal, and even if a signal processing algorithm is adopted, the directivity of the microphone array can be improved by adding the sound cover, the signal-to-noise ratio is improved, and meanwhile, noise in other areas is blocked to a certain extent, so that the microphone array obtains more useful information in a sound pickup stage, and the limit of a subsequent signal processing algorithm is improved.

In specific implementation, in order to facilitate fixing and installation in use, the device further comprises a support 3, the support 3 comprises at least one side plate 31 and a bottom plate 32, one side plate 31 is provided with a through groove 311, the side plate 31 with the through groove 311 is provided with a bolt hole, and the side plate with the through groove is arranged to be connected with one end of the sound cover 1 far away from the sound pickup opening through a bolt. Specifically, one end of the columnar mounting seat protrudes out of the bottom of the sound cover 2 and is clamped in the through groove. The bottom plate is provided with an adjusting hole and is connected with other components through a bolt penetrating through the adjusting hole. When the adjusting device is used, the direction of the sound pickup opening of the sound cover 1 can be adjusted through the matching of the adjusting hole and the corresponding bolt.

Test example 1

For example 2, a simulation test of the sound pickup capability of the device was performed based on the magnitude of the apex angle of the conical hole, so as to analyze the amplitude-frequency response at different positions of the axis of the sound cover 2.

The test parameters are as follows:

TABLE 1 test Sound cover parameters

Wherein, regarding the cone apex angle theta and the bottom diameter d₁(mm) diameter of open endd₂(mm), height h (mm), and top thickness δ (mm) referring to fig. 5, the 6 sound enclosures 2 are tested, sound pressure is calculated and analyzed by using acoustic simulation software, and during simulation, the microphone is rotated on the axis of the sound enclosure 2 in a linear manner, and the microphone position is simulated by setting an arbitrary distance on the axis.

The simulation test shows that: the sound cover with the cone apex angle of 30-90 degrees has good directivity. On one hand, the width of the main lobe of the beam of the horn with a small opening is narrower; on the other hand, a horn with a small opening has a higher gain for the target direction signal. In addition, the closer to the sound pickup opening on the axis of the sound cover, the more complicated the peak-valley characteristics of the amplitude-frequency response, and therefore, when designing the beam, the microphone at the position inside the sound cover is selected in accordance with the length of the sound cover 2.

The cone apex angle corresponding to the tone mask is set between 30-90 degrees in consideration of the tone mask size, the frequency range of the target pickup signal, and the like. And the amplitude-frequency response is relatively stable at the position close to the bottom of the sound-collecting cavity, and the phase-frequency response changes less because the time difference between the inner direct sound and the reflected sound is smaller, so that the microphone is placed at the position of the bottom of the sound cover as much as possible.

Test example 2

In order to verify the effectiveness of the device, the measurement angle is the same, and the measurement angle is the included angle between the central line of the sound cover and the connecting line from the sound source to the bottom of the sound collecting cavity. The test angle used in this test example was 0 degrees, i.e., the pickup port was facing the sound source. Tests were performed in the anechoic chamber with and without the sound enclosure, respectively, and the amplitude-frequency response of the transfer function was calculated.

The test result is shown in fig. 6, and it can be seen from the figure that the sound wave amplitude is significantly higher than 10-20dB without the sound cover, that is, the scheme provided by the present invention can achieve high sound pickup effect.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.

Claims

1. A sound pickup apparatus characterized in that: comprises a pickup assembly (1) and a sound cover (2);

a sound collecting cavity (21) is arranged on the sound cover (2), and the sound collecting component (1) is installed in the sound collecting cavity (21);

one side of the sound-collecting cavity (21) is provided with a sound-collecting opening, and the section of the sound-collecting cavity (21) is gradually enlarged along the direction towards the sound-collecting opening.

2. The pickup device according to claim 1, wherein: the pickup assembly (1) comprises a mounting base (11) and a microphone (12);

the mounting seat (11) is mounted at the bottom of the sound-collecting cavity (21);

the number of the microphones (12) is multiple, and the microphones (12) are arranged on the mounting seat (11).

3. The pickup device according to claim 2, wherein: the mounting seat (11) is columnar, and one end of the mounting seat (11) is connected with the bottom of the sound-collecting cavity (21);

the central line of the mounting seat (11) is superposed with the central line of the sound-collecting cavity (21);

the microphones (12) are distributed on the periphery of the mounting seat (11).

4. The pickup device according to claim 2, wherein: the number of the microphones (12) is 6-24.

5. The pickup device according to claim 2, wherein: the mounting seat (11) is of a cylindrical structure, and the microphones (12) are uniformly distributed on the periphery of the cylindrical structure.

6. The sound pickup apparatus according to any one of claims 1 to 5, wherein: the sound-collecting cavity (21) is a conical hole.

7. The pickup device according to claim 6, wherein: the sound cover (2) comprises a first cover body (22) and a second cover body (23);

one side of the first cover body (22) is provided with a taper hole (221); a through hole (231) is formed in the second cover body (23), and the diameter of the through hole (231) is gradually increased or decreased along the axial direction of the through hole;

the second cover body (23) is connected with one end of the second cover body (23), and the taper hole (221) is communicated with the through hole (231) to form the taper hole.

8. The pickup device according to claim 7, wherein: a first nesting part (222) is arranged on the first cover body (22), and a second nesting part (232) is arranged on the second cover body (23); the first nesting part (222) is nested and connected with the second nesting part (232).

9. The pickup device according to claim 8, wherein: bolts are connected between the first nesting part (222) and the second nesting part (232), the number of the bolts is multiple, and the bolts are uniformly distributed along the periphery of the second nesting part (232).

10. The pickup device according to claim 9, wherein: the size of the cone apex angle of the conical hole is 30-90 degrees.

11. The sound pickup apparatus according to any one of claims 1 to 5, wherein: the pickup device further comprises a support (3), the support (3) comprises a side plate (31) and a bottom plate (32), one is that a through groove (311) is formed in the side plate (31), a bolt hole is formed in the side plate (31) with the through groove (311), and the side plate (31) is connected with the sound cover (2) through a bolt at one end of the pickup opening.