CN112839275A - Pickup device of self-service equipment and design method - Google Patents
Pickup device of self-service equipment and design method Download PDFInfo
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- CN112839275A CN112839275A CN202011611907.3A CN202011611907A CN112839275A CN 112839275 A CN112839275 A CN 112839275A CN 202011611907 A CN202011611907 A CN 202011611907A CN 112839275 A CN112839275 A CN 112839275A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
The invention discloses a pickup device of self-service equipment and a design method, wherein the pickup device comprises a pickup device body and is characterized in that: pickup device includes casing, back shroud and pickup hardware module, casing fixed connection back shroud, casing fixed connection pickup hardware module, pickup hardware module with be provided with the sealing member between the casing, the casing the sealing member reaches pickup hardware module forms the sound chamber, pickup hardware module sets up in the casing. The invention relates to the technical field of information, in particular to a self-service equipment sound pickup device and a design method. The design and the installation of the pickup device are convenient.
Description
Technical Field
The invention relates to the technical field of information, in particular to a self-service equipment sound pickup device and a design method.
Background
Sound pickup devices have become one of the most commonly used articles in modern daily life, such as mobile communication devices, recording pens, music playing devices with recording function, etc., and sound pickup devices with good quality are required to receive external sounds.
In recent years, artificial intelligence technology is rapidly developed, some functions of the technology are gradually applied and popularized in actual products, especially, a voice recognition technology is more and more widely applied, and how to realize terminal application of the technology is a solution which is sought by many manufacturers. At present, the self-service equipment pickup device with the optimal pickup device inclination angle is not designed by considering factors such as the height of the pickup device, the sound source distance and the like. Moreover, existing sound pickup apparatuses rarely consider the influence of the acoustic cavity, the size of the sound outlet hole, and the number of microphones on sound pickup. This is a disadvantage of the prior art.
Disclosure of Invention
The invention aims to provide a self-service equipment sound pickup device and a design method thereof, which are convenient for the design and installation of the sound pickup device.
The invention adopts the following technical scheme to realize the purpose of the invention:
a pickup device of self-service equipment and a design method thereof comprise the pickup device, and are characterized in that: pickup device includes casing, back shroud and pickup hardware module, casing fixed connection back shroud, casing fixed connection pickup hardware module, pickup hardware module with be provided with the sealing member between the casing, the casing the sealing member reaches pickup hardware module forms the sound chamber, pickup hardware module sets up in the casing.
As a further limitation of the technical scheme, the shell is fixedly connected with the self-service equipment, and the rear cover plate is fixedly connected with the self-service equipment.
A use design method of a self-service equipment sound pickup device is characterized by comprising the following steps:
the method comprises the following steps: the sound cavity structure inside the pickup device is designed;
step two: the sound pickup device is designed in the mounting position.
As a further limitation of the technical solution, the step one is as follows:
the method comprises the following steps: the acoustic cavity adopts the Helmholtz resonator principle to carry out the structural design of the acoustic cavity;
the first step is: the motion characteristic of the gas in the sound cavity is similar to that of a mass-spring-damping system, and the resonance frequency f of the sound wave can be obtained0：
L + Δ L (formula 2)
Wherein: c is the speed of sound;
s is the sectional area of the acoustic cavity;
l is the effective length of the acoustic chamber;
l is the actual physical length of the inlet orifice;
Δ l is a length correction taking into account the flow effect near the orifice end;
v is the volume of the container;
step one is three: for the correction quantity Δ l of the end of the hole, a correction method without significant air flow is selected:
wherein: sigma is the ratio of the opening area of the acoustic cavity, namely the ratio of the hole sectional area to the cavity sectional area;
d is the diameter of the neck or opening;
step one is: bringing formula 2 and formula 3 into formula 1 to obtain the resonant frequency f of the sound wave0：
Step one and five: by controlling S, d and v, an acoustic cavity suitable for human voice frequency is made, so that the human voice is reduced at minimum and the noise is reduced at maximum.
As a further limitation of the technical solution, the second step specifically comprises the following steps: carrying out analog simulation according to a sound field intensity formula:
h phi E theta/eta 0 (formula 5)
Wherein: e θ is the component of the field strength θ, in units of V/m;
h phi is the component of the field strength phi, in units of A/m;
e is a coefficient related to excitation;
therefore, on a spherical surface away from the antenna r, the radiation field intensity E of the antenna can be represented by a directivity function F (theta, phi), and is called a normalized directivity function after being normalized by the maximum value fmax, and is marked as F (theta, phi);
the directional function comprises an amplitude directional function, a phase directional function and a power density directional function;
a normalized amplitude directivity function F (θ, Φ) ═ E (θ, Φ) |/| E (θ, Φ) | max ═ F (θ, Φ)/fmax;
normalizing the power directivity function S (θ, Φ) to F (θ, Φ);
the directivity function is expressed in decibels as 20lg F (θ, Φ) dB in FdB.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the invention provides a sound cavity design method of a sound pickup device, and designs a sound pickup device scheme by using the method.
2. The sound pickup device is designed to have the optimal sound cavity structure size through the calculation method by matching the sizes of the sound cavity and the sound outlet hole with a certain number of microphones.
3. The angle of the pickup device with the fixed angle does not need to be additionally adjusted during working, so that the beneficial effect of effectively improving the pickup efficiency of the self-service equipment is realized.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a diagram showing simulation results of the pickup device of the self-service equipment of the present invention.
Fig. 3 is a partial structural schematic diagram of the present invention.
In the figure: 1. casing, 2, sealing member, 3, sound chamber, 4, pickup hardware module, 5, back shroud, 6, self-service equipment.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.
As shown in fig. 1 to 3, the present invention includes a sound pickup apparatus, where the sound pickup apparatus includes a housing 1, a back cover plate 5, and a sound pickup hardware module 4, the housing 1 is fixedly connected to the back cover plate 5, the housing 1 is fixedly connected to the sound pickup hardware module 4, a sealing member 2 is disposed between the sound pickup hardware module 4 and the housing 1, the sealing member 2, and the sound pickup hardware module 4 form a sound cavity 3, and the sound pickup hardware module 4 is disposed in the housing 1.
The shell 1 is fixedly connected with self-service equipment 6, and the rear cover plate 5 is fixedly connected with the self-service equipment 6.
A design method for a pickup device of self-service equipment is characterized by comprising the following steps:
the method comprises the following steps: the sound cavity 3 in the pickup device is structurally designed;
step two: the sound pickup device is designed in the mounting position.
The first step is as follows: the method comprises the following steps: the acoustic cavity adopts the Helmholtz resonator principle to carry out the structural design of the acoustic cavity;
the first step is: the motion characteristic of the gas in the sound cavity is similar to that of a mass-spring-damping system, and the resonance frequency f of the sound wave can be obtained0：
L + Δ L (formula 2)
Wherein: c is the speed of sound;
s is the sectional area of the acoustic cavity;
l is the effective length of the acoustic chamber;
l is the actual physical length of the inlet orifice;
Δ l is a length correction taking into account the flow effect near the orifice end;
v is the volume of the container;
step one is three: for the correction quantity Δ l of the end of the hole, a correction method without significant air flow is selected:
wherein: sigma is the ratio of the opening area of the acoustic cavity, namely the ratio of the hole sectional area to the cavity sectional area;
d is the diameter of the neck or opening;
step one is: bringing formula 2 and formula 3 into formula 1 to obtain the resonant frequency f of the sound wave0：
Step one and five: by controlling S, d and v, an acoustic cavity suitable for human voice frequency is made, so that the human voice is reduced at minimum and the noise is reduced at maximum.
The second step comprises the following specific steps: carrying out analog simulation according to a sound field intensity formula:
h phi E theta/eta 0 (formula 5)
Wherein: e θ is the component of the field strength θ, in units of V/m;
h phi is the component of the field strength phi, in units of A/m;
e is a coefficient related to excitation;
therefore, on a spherical surface away from the antenna r, the radiation field intensity E of the antenna can be represented by a directivity function F (theta, phi), and is called a normalized directivity function after being normalized by the maximum value fmax, and is marked as F (theta, phi);
the directional function comprises an amplitude directional function, a phase directional function and a power density directional function;
a normalized amplitude directivity function F (θ, Φ) ═ E (θ, Φ) |/| E (θ, Φ) | max ═ F (θ, Φ)/fmax;
normalizing the power directivity function S (θ, Φ) to F (θ, Φ);
the directivity function is expressed in decibels as 20lg F (θ, Φ) dB in FdB.
The working process of the invention is as follows:
the structure design of the sound cavity 3 in the pickup device is as follows: the acoustic cavity adopts the Helmholtz resonator principle to carry out the structural design of the acoustic cavity; the motion characteristic of the gas in the sound cavity is similar to that of a mass-spring-damping system, and the resonance frequency f of the sound wave can be obtained0：
L + Δ L (formula 2)
For the correction quantity Δ l of the end of the hole, a correction method without significant air flow is selected:
bringing formula 2 and formula 3 into formula 1 to obtain the resonant frequency f of the sound wave0：
By controlling S, d and v, an acoustic cavity suitable for human voice frequency is made, so that the human voice is reduced at minimum and the noise is reduced at maximum.
For example: the sound hole of the microphone is phi 0.8, d is 1.2mm according to the design specification of the sound outlet hole of the microphone, the sound velocity c is 331.45m/s, V is 63.58 square millimeters and L is 4 millimeters according to the design requirement of the sound cavity of the microphone, the frequency f is obtained by substituting the formula 40298HZ, corresponding to the frequency median range of normal human voice.
The design of the mounting position of the pickup device is as follows: carrying out analog simulation according to a sound field intensity formula:
h phi E theta/eta 0 (formula 5)
Therefore, on a spherical surface away from the antenna r, the radiation field intensity E of the antenna can be represented by a directivity function F (theta, phi), and is called a normalized directivity function after being normalized by the maximum value fmax, and is marked as F (theta, phi);
the directional function comprises an amplitude directional function, a phase directional function and a power density directional function;
a normalized amplitude directivity function F (θ, Φ) ═ E (θ, Φ) |/| E (θ, Φ) | max ═ F (θ, Φ)/fmax;
normalizing the power directivity function S (θ, Φ) to F (θ, Φ);
the directivity function is expressed in decibels as 20lg F (θ, Φ) dB in FdB.
The simulation result of the formula 5 is shown in fig. 2, the concentric circles represent the vertical distance from the sound source to the center of the mic array, the central angle represents the angle between the sound source and the mic array, and it can be known from the figure that the mic array sound pickup presents a certain angle and a certain distance. The sound pickup effect between the right front and the left 30 degrees is the best, the sound pickup effect attenuation in other directions is larger, and the sound pickup effect attenuation at some angles is almost completely attenuated.
The housing 1, the seal 2, the acoustic chamber 3, the sound pickup hardware module 4, and the back cover 5 are mounted at the positions shown in fig. 1.
The above disclosure is only for the specific embodiment of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art should fall within the scope of the present invention.
Claims (5)
1. The utility model provides a self-service equipment pickup apparatus, includes pickup apparatus, its characterized in that:
the pickup device comprises a shell (1), a rear cover plate (5) and a pickup hardware module (4);
the shell (1) is fixedly connected with a rear cover plate (5);
the shell (1) is fixedly connected with a pickup hardware module (4);
a sealing element (2) is arranged between the pickup hardware module (4) and the shell (1);
the shell (1), the sealing element (2) and the pickup hardware module (4) form an acoustic cavity (3);
the pickup hardware module (4) is arranged in the shell (1).
2. The self-service equipment pickup device of claim 1, wherein: the shell (1) is fixedly connected with a self-service device (6), and the rear cover plate (5) is fixedly connected with the self-service device (6).
3. A design method for a pickup device of self-service equipment is characterized by comprising the following steps:
the method comprises the following steps: the sound cavity (3) is structurally designed;
step two: the sound pickup device is designed in the mounting position.
4. The design method of the pickup device of the self-service equipment according to claim 3, characterized in that: the first step is as follows:
the method comprises the following steps: the acoustic cavity adopts the Helmholtz resonator principle to carry out the structural design of the acoustic cavity;
the first step is: the motion characteristic of the gas in the sound cavity is similar to that of a mass-spring-damping system, and the resonance frequency f of the sound wave can be obtained0：
L + Δ L (formula 2)
Wherein: c is the speed of sound;
s is the sectional area of the acoustic cavity;
l is the effective length of the acoustic chamber;
l is the actual physical length of the inlet orifice;
Δ l is a length correction taking into account the flow effect near the orifice end;
v is the volume of the container;
step one is three: for the correction quantity Δ l of the end of the hole, a correction method without significant air flow is selected:
wherein: sigma is the ratio of the opening area of the acoustic cavity, namely the ratio of the hole sectional area to the cavity sectional area;
d is the diameter of the neck or opening;
step one is: bringing formula 2 and formula 3 into formula 1 to obtain the resonant frequency f of the sound wave0：
Step one and five: by controlling S, d and v, an acoustic cavity suitable for human voice frequency is made, so that the human voice is reduced at minimum and the noise is reduced at maximum.
5. A design method of a pickup device of self-service equipment is characterized by comprising the following steps: the second step comprises the following specific steps: carrying out analog simulation according to a sound field intensity formula:
h phi E theta/eta 0 (formula 5)
Wherein: e θ is the component of the field strength θ, in units of V/m;
h phi is the component of the field strength phi, in units of A/m;
e is a coefficient related to excitation;
therefore, on a spherical surface away from the antenna r, the radiation field intensity E of the antenna can be represented by a directivity function F (theta, phi), and is called a normalized directivity function after being normalized by the maximum value fmax, and is marked as F (theta, phi);
the directional function comprises an amplitude directional function, a phase directional function and a power density directional function;
a normalized amplitude directivity function F (θ, Φ) ═ E (θ, Φ) |/| E (θ, Φ) | max ═ F (θ, Φ)/fmax;
normalizing the power directivity function S (θ, Φ) to F (θ, Φ);
the directivity function is expressed in decibels as 20lg F (θ, Φ) dB in FdB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011611907.3A CN112839275A (en) | 2020-12-30 | 2020-12-30 | Pickup device of self-service equipment and design method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011611907.3A CN112839275A (en) | 2020-12-30 | 2020-12-30 | Pickup device of self-service equipment and design method |
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| Publication Number | Publication Date |
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| CN112839275A true CN112839275A (en) | 2021-05-25 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209105453U (en) * | 2019-01-15 | 2019-07-12 | 歌尔科技有限公司 | MEMS microphone and electronic equipment |
| WO2020052157A1 (en) * | 2018-09-14 | 2020-03-19 | 深圳市博电电子技术有限公司 | Voice control intelligent toilet |
-
2020
- 2020-12-30 CN CN202011611907.3A patent/CN112839275A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020052157A1 (en) * | 2018-09-14 | 2020-03-19 | 深圳市博电电子技术有限公司 | Voice control intelligent toilet |
| CN209105453U (en) * | 2019-01-15 | 2019-07-12 | 歌尔科技有限公司 | MEMS microphone and electronic equipment |
Non-Patent Citations (2)
| Title |
|---|
| 曹祥玉，高军，曾越胜等: "《微波技术与天线》", 31 March 2008 * |
| 许晓勇，刘红珍: "赫姆霍兹声腔声学特性实验研究", 《火箭推进》 * |
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