CN113473278A

CN113473278A - Sound and microphone integrated equipment capable of effectively inhibiting squeaking

Info

Publication number: CN113473278A
Application number: CN202110802912.0A
Authority: CN
Inventors: 刘大敏; 尤广静; 邹先秉
Original assignee: Shenzhen Teana Technology Co ltd
Current assignee: Shenzhen Teana Technology Co ltd
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2021-10-01

Abstract

The utility model relates to an effectively restrain integrative equipment of stereo set microphone of howling, it includes the casing, the casing is equipped with the miaow head subassembly, the miaow head subassembly is including two directional miaow heads, the casing is equipped with at least one above loudspeaker, when one or more loudspeaker sent the sound of same frequency, the distance that two adapterization mouths of two directional miaow heads were passed to sound equals to the vibrating diaphragm that can make two directional miaow heads is in relative quiescent condition. The method and the device have the effects of improving pickup sensitivity, expanding pickup angle, improving sound tone quality and reducing howling influence.

Description

Sound and microphone integrated equipment capable of effectively inhibiting squeaking

Technical Field

The application relates to the technical field of microphones, in particular to sound and microphone integrated equipment capable of effectively inhibiting howling.

Background

In the existing portable device integrating the microphone and the sound, resonance and self-excitation effects (also called howling) are necessarily brought about because the microphone and the sound are integrated into a whole. The resonance feedback self-excitation effect generally comes from two aspects, one is back transmission through air, and the other is resonance of the equipment; the return air flow is generally less affected, while the equipment itself is more affected by the faster sound transmission of the solid. The specific reason is that the sound box can generate vibration with the same sound frequency as the sound, when the microphone and the sound box are integrated or are close to each other, the sound input from the microphone is amplified by the sound box and then transmitted to the microphone through the shell, at the moment, the microphone inputs the sound with the same frequency again and amplifies the sound again, and after repeated amplification for many times, a strong self-feedback effect, namely a self-excitation effect, is generated, and at the moment, the sound with the same frequency is continuously and intensively generated in the sound box (commonly called howling, so that the normal use is completely destroyed.

Therefore, how to combine the microphone and the audio box into one, and simultaneously, the method can reduce the influence of howling and improve the sound quality, and is a difficult problem in the microphone industry at present.

Disclosure of Invention

In order to suppress howling and improve the sound quality of an audio-microphone integrated device, the present application provides an audio-microphone integrated device that effectively suppresses howling.

The sound and microphone integrated equipment for effectively inhibiting howling adopts the following technical scheme:

the utility model provides an effectively restrain integrative equipment of stereo set microphone of howling, includes the casing, the casing is equipped with the miaow head subassembly, the miaow head subassembly includes two directional miaow heads, the casing is equipped with at least more than one loudspeaker, when one or more loudspeaker sent the sound of same frequency, the distance that two pickup openings of two directional miaow heads were passed to sound equals to the vibrating diaphragm that can make two directional miaow heads is in relative quiescent condition.

By adopting the technical scheme, the principle of phase offset can be realized by utilizing the characteristic of the double-pointing microphone, and the sound of the horn can not be heard by the sound pick-up. Specifically, the loudspeaker sends out the sound with the same frequency, the sound passes through the equal distance and reaches the two sound pickup ports of the double-pointing microphone, the sound wave phase angles of the sound of the two sound pickup ports acting on the vibrating diaphragm are 180 degrees, the sound frequencies are the same, the amplitudes of the sound are the same, then the vibrating diaphragm of the double-pointing microphone can keep a relatively static state, and in practical conditions, the vibration amplitude is small.

Specifically, the integrative equipment during operation of stereo set microphone, user's mouth is close to a pickup mouth of two directional miaow heads, and another pickup mouth dorsad, so just only a pickup mouth pickup, so, two directional miaow heads can pick up well, after sound is enlargied through loudspeaker, the sound of same frequency conveys the pickup mouth of two directional miaow head both sides with the mode that the phase angle differed 180, at this moment, the vibrating diaphragm of two directional miaow heads can avoid the emergence vibration in very big degree, also be exactly not the pickup. That is to say, this kind of setting can let two directional miaow heads only pick up the sound that the user directly sent and do not pick up the sound that loudspeaker sent to avoid the emergence needle of howling, can effectively improve the tone quality and the experience of the integrative equipment of stereo set microphone.

When improving the integrative equipment tone quality of stereo set microphone, the device that actually needs is less, also can optimize the space and the volume of casing at to a great extent to guarantee the exquisite degree of the integrative equipment of stereo set microphone, can be when promoting tone quality, simplify the volume of casing and optimize casing spatial structure. More importantly, when the sound and microphone integrated equipment is actually applied, compared with an ordinary microphone, the sound and microphone integrated equipment can emit larger sound at the same distance under the condition of sound absorption. Therefore, the integrative equipment suitability of stereo set microphone of this application is higher, and commercial value is bigger, has outstanding effect.

Optionally, still including setting up the master control circuit in the casing, the miaow head subassembly still includes single directional miaow head, the pickup direction of single directional miaow head and the axial contained angle of the integrative equipment of stereo set microphone are less than 30 to supply single directional miaow head to acquire user's sound in the longitudinal direction, single directional miaow head with respectively input master control circuit after the two directional miaow heads pickup and handle.

Through adopting above-mentioned technical scheme, the single direction miaow head that sets up can cooperate two direction miaow heads, acquires the sound that the user sent jointly, and then is convenient for improve the sensitivity of the integrative equipment of stereo set microphone. Generally, to realize that two pickup ports of two directional miaow heads are the same from the distance of same frequency sound, can only place two directional miaow heads transversely in whole stereo set microphone integrative equipment's axial, so in longitudinal direction, it just can't pick up well, causes to experience not good. A single-direction microphone is additionally arranged, the axial included angle between the pickup direction and the sound and microphone integrated equipment is smaller than 30 degrees, and the problem that the pickup angle of the double-direction microphone is insufficient is solved.

Optionally, the axis of the unidirectional microphone and the axis of the dual-directional microphone form a limiting included angle, an external user can acquire voice at more angles by the unidirectional microphone and the dual-directional microphone, and the limiting included angle is larger than 70 degrees and smaller than 110 degrees.

Through adopting above-mentioned technical scheme, the angle scope setting of spacing contained angle is convenient for aim at the user with the directional miaow head is better to improve receiving efficiency and sensitivity. Simultaneously, the position of the single-direction microphone is convenient to change according to actual needs by the angle adjustable mode, and the structural diversity of the sound and microphone integrated equipment is improved.

Optionally, the microphone assembly further comprises a microphone bracket for mounting the dual-directional microphone and/or the single-directional microphone to absorb vibration from the housing.

Through adopting above-mentioned technical scheme, the miaow head support that sets up can effectively alleviate because of the vibration fluctuation that the stereo set vibration brought to can effectively reduce the influence of whistling with a lou, improve the tone quality volume of the integrative equipment of stereo set microphone.

Optionally, when the speakers are arranged in pairs, each pair of speakers is set at two sides of the housing and in a mirror axial symmetry relationship.

By adopting the technical scheme, the effect that the double-direction microphone keeps relatively static as much as possible can be achieved at the position where the loudspeaker is arranged, and the position of the loudspeaker on the shell can be randomly arranged.

Optionally, the speaker is an active speaker or a passive speaker, and the active speaker is electrically connected to a main control circuit inside the housing, so that the active speaker operates.

Through adopting above-mentioned technical scheme, do not do the restriction to the use type of loudspeaker, be convenient for improve the suitability and the flexibility of the integrative equipment of stereo set microphone, be convenient for according to actual demand, design rationalization's structure.

Optionally, the dual-directional microphone is a microphone of a capacitive electret.

By adopting the technical scheme, the microphone of the capacitive electret has the characteristics of small volume, light weight, high sensitivity and excellent frequency response due to the adoption of the ultrathin vibrating membrane. At the same time, has extremely broad frequency response. Thereby effectively improving the application market of the sound and microphone integrated equipment.

Optionally, the single-directional microphone is a capacitive or moving-coil microphone, and the sensitivity of the single-directional microphone is lower than that of the dual-directional microphone.

Through adopting above-mentioned technical scheme, when the sensitivity of single directional miaow head was less than the sensitivity of two directional miaow heads, the advantage of the integrative equipment of stereo set microphone can incline two directional miaow heads, and then is convenient for improve the sensitivity and the tone quality volume of the integrative equipment of stereo set microphone.

Optionally, a preset angle is formed between an axis of the sound collecting surface of the unidirectional microphone and an axis of the sound playing direction of the horn, and the preset angle is greater than 60 degrees and smaller than 120 degrees.

By adopting the technical scheme, when the axis of the sound receiving surface of the unidirectional microphone and the axis of the loudspeaker in the sound playing direction form a preset angle, particularly the preset angle is not 90 degrees, the applicability of placing the unidirectional microphone can be conveniently improved.

Optionally, the limit included angle comprises 90 °.

Through adopting above-mentioned technical scheme, spacing contained angle is the mode that 90 set up, is more convenient for install single directional miaow head and two directional miaow heads.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the tone quality of the sound and microphone integrated equipment can be effectively improved;

2. the sound quality of the sound and microphone integrated equipment is improved, and simultaneously, the sound and the microphone integrated equipment can produce larger sound than a common microphone under the condition of sound receiving at the same distance. Therefore, the integrative equipment suitability of stereo set microphone of this application is higher, and commercial value is bigger, has outstanding effect. Drawings

FIG. 1 is a schematic view of a single horn and housing in one embodiment;

FIG. 2 is a right side view of the single horn and housing of FIG. 1;

fig. 3 is a schematic view of the sound transmission of a single horn of fig. 1 to a dual directional microphone;

FIG. 4 is an overall schematic view of the speakers and the housing in an opposing and staggered arrangement in one embodiment;

fig. 5 is a schematic position diagram of the two speakers and the dual directional microphone in fig. 4;

fig. 6 is a schematic view of the two-horn sound of fig. 4 being transmitted to a dual directional microphone;

FIG. 7 is an overall schematic view of a symmetrically disposed horn and housing in one embodiment;

fig. 8 is a left side view of the horn and the dual directional microphone of fig. 7;

fig. 9 is a schematic diagram of the position of the two speakers of fig. 7 for transmitting sound to the dual directional microphone;

fig. 10 is a schematic position diagram of the symmetrically arranged horn and the dual directional microphone in one embodiment;

fig. 11 is a left side view of the horn and the dual directional microphone of fig. 10;

fig. 12 is a schematic view of the position of the two horns of fig. 10 transmitting sound to the dual directional microphone;

figure 13 is a schematic position diagram of a dual directional microphone and a single directional microphone in one embodiment;

FIG. 14 is a schematic illustration of the positions of the annular sleeve and the cushion sleeve in one embodiment.

Reference numerals: 1. a housing; 21. a dual-directional microphone; 22. a single-direction microphone; 3. a horn; 4. a microphone bracket; 41. a Y-shaped bracket; 411. threading holes; 42. a protective sleeve; 43. an annular sleeve; 44. a buffer sleeve; 441. a first mounting sleeve; 442. a second mounting sleeve; 443. a third mounting sleeve; 44. a connecting rod; 5. and a positioning column.

Detailed Description

The present application is described in further detail below with reference to figures 1-14.

Example 1:

the embodiment of the application discloses integrative equipment of stereo set microphone of effectively suppressing howling, refer to fig. 1, and it includes casing 1, miaow head subassembly and loudspeaker 3, miaow head subassembly sets up on casing 1, is used for collecting the sound that the user sent, and miaow head subassembly includes more than one two directional miaow head 21, does not limit to the quantity of two directional miaow head 21, but the two directional miaow head 21 quantity that set up can reach the effect of obtaining the sound. The number of the horn 3 is 1 or more. In the present embodiment, there are 1 dual

directional microphones

21 and 1 horn 3.

Referring to fig. 1 and 2, the speaker 3 is specifically an active speaker or a passive speaker, and the active speaker or the passive speaker is electrically connected to a main control circuit inside the housing 1, so that the active speaker or the passive speaker operates. In the present embodiment, the dual directional microphone 21 is embodied as a microphone of a capacitive electret.

Referring to fig. 1 and 2, in order to further improve the sound quality of the housing 1, a microphone holder 4 is disposed on the housing 1, the microphone holder 4 includes a Y-shaped holder 41 and a protective cover 42, the Y-shaped holder 41 is mounted on the housing 1, the protective cover 42 is mounted on the Y-shaped holder 41, and the protective cover 42 is made of an elastic material, such as sponge, rubber, or the like. Lag 42 cavity sets up, and two directional miaow heads 21 are overlapped and are established in lag 42, and lag 42's both sides are equipped with connecting rod 44, and lag 42 passes through connecting rod 44 to be installed in miaow head support 4, and miaow head support 4 mutually supports with lag 42, can cushion the vibration that two directional miaow heads 21 brought.

Referring to fig. 2, the axis of the dual directional horn 21 is perpendicular to the axis of the horn 3. A threading hole 411 is longitudinally arranged in the microphone bracket 4, and the threading hole 411 is used for the working conducting wire on the double-direction microphone 21 to be electrically connected with the main control circuit of the shell 1. Referring to fig. 3, fig. 3 is a left side view of fig. 2. When the loudspeaker 3 produces sound, the distance between the sound with the same frequency and the two sound pickup ports of the two directional microphone 21 is equal, and the phase angle is 180 degrees, so that the vibrating diaphragm of the two directional microphone 21 can be in a relatively static or small-amplitude vibration state, and the howling is greatly reduced.

In order to improve the timbre and volume of the housing 1, the microphone assembly further comprises a single-directional microphone 22 (not shown), the single-directional microphone 22 being a capacitive or moving coil microphone, the single-directional microphone 22 being mounted on the microphone holder 4. In order to better reflect the squeal resistance of the dual directional microphone 21 in the housing 1, the sensitivity of the single directional microphone 22 is set lower than the sensitivity of the dual directional microphone 21.

The pickup direction of the unidirectional microphone 22 and the axial included angle of the sound and microphone integrated equipment are smaller than 30 degrees, so that the unidirectional microphone 22 can conveniently acquire the sound of a user in the longitudinal direction, and the unidirectional microphone 22 and the dual-directional microphone 21 respectively input the sound into the main control circuit for processing after pickup. The axis of single directional miaow head 22 and the axis of two directional miaow heads 21 form spacing contained angle, and spacing contained angle supplies external user can obtain the people's voice of more angles by single directional miaow head 22 and two directional miaow heads 21.

The range of the limiting included angle is larger than 70 degrees and smaller than 110 degrees. In the present embodiment, the limiting included angle is 90 °, that is, the axis of the sound-collecting surface of the unidirectional microphone 22 is perpendicular to the axis of the dual-directional microphone 21. In other embodiments, the limiting included angle may be one of 70 °, 75 °, 80 °, and 85 °, but the setting of the limiting included angle may achieve the effect that the single-direction microphone 22 is ready to capture sound. In addition, the axis of the sound receiving surface of the unidirectional microphone 22 and the axis of the sound playing direction of the horn 3 form a preset angle, the preset angle is greater than 60 degrees and smaller than 120 degrees, and specifically, the preset angle can be 60 degrees, 90 degrees, 120 degrees and the like.

Referring to fig. 3, the implementation principle of embodiment 1 of the present application is: when the loudspeaker 3 produces sound, the distance from the sound with the same frequency to the two pickup ports of the double-direction microphone 21 is equal, the phase angle is 180 degrees, and because the sound frequency received by the vibrating diaphragms on the two sides of the double-direction microphone 21 is the same, the amplitude is the same, and the phase angle is 180 degrees, the vibration of the vibrating diaphragms is relatively small at the moment, or under a proper condition, the vibrating diaphragms are in a relatively static state, aiming at the situation, the sound with the same frequency can be effectively prevented from being input and amplified again, so that the squeal degree can be effectively reduced, and the tone quality and the volume of the shell 1 can be improved.

In addition, the single-direction microphone 22 can be matched with the double-direction microphone 21 to commonly acquire the sound emitted by the user, so that the sensitivity of the sound and microphone integrated equipment is improved conveniently. Generally, to realize that the distances from two sound pickup ports of the dual-directional microphone 21 to sounds with the same frequency are the same, the dual-directional microphone 21 can only be placed transversely to the axial direction of the whole sound and microphone integrated equipment, so that the dual-directional microphone cannot pick up sound well in the longitudinal direction, and poor experience is caused. A single-direction microphone 22 is additionally arranged, the axial included angle between the sound pickup direction and the sound and microphone integrated equipment is smaller than 30 degrees, and the problem that the sound pickup angle of the double-direction microphone 21 is insufficient can be solved.

Example 2:

referring to fig. 4, the present application differs from embodiment 1 in that a pair of horns 3 is provided in the embodiment of the present application, and in other embodiments, 2 pairs or more of horns 3 may be provided. Referring to fig. 5, the speakers 3 of the embodiment of the present application are disposed in a staggered manner and are respectively disposed at two sides of the housing 1. Specifically, the axes of the two speakers 3 are parallel to each other and are in a mirror axial symmetry relationship. In addition, the axes of the two horns 3 are perpendicular to the axis of the two directional microphones 21.

Referring to fig. 6, fig. 6 is a left side view of fig. 4, when the loudspeakers 3 on opposite sides generate sounds, the sounds with the same frequency are transmitted to the two sound pickup ports of the dual-directional microphone 21 at equal distances and at a phase angle different by 180 °, and accordingly, the diaphragms on both sides of the dual-directional microphone 21 can be in a relatively static state or a state of small-amplitude vibration, so that howling is greatly reduced.

Example 3:

referring to fig. 7, the present application differs from embodiment 1 in that a pair of horns 3 is provided, the two horns 3 are mounted on opposite sides of the housing 1, and the two horns 3 are coaxial and in a mirror-axial symmetrical relationship. Referring to fig. 8 and 9, when the loudspeakers 3 on opposite sides generate sound, the distance between the sound with the same frequency and the two sound pickup ports of the dual-directional microphone 21 is equal, and the phase angle is 180 degrees, so that the diaphragms on both sides of the dual-directional microphone 21 can be in a relatively static or small-amplitude vibration state, and howling is greatly reduced.

Example 4:

referring to fig. 10 and 11, the present application differs from embodiment 1 in that a pair of horns 3 is provided in the embodiment of the present application, the two horns 3 are mounted on opposite sides of the housing 1, and the two horns 3 are coaxial and in a mirror-axial symmetrical relationship. In the present embodiment, the axis of the dual directional horn 21 is parallel to the axis of the horn 3.

Referring to fig. 12, when the loudspeakers 3 on opposite sides generate sound, the sound with the same frequency is transmitted to the two sound pickup ports of the dual-directional microphone 21 at equal distances and at a phase angle different by 180 °, so that the diaphragms on both sides of the dual-directional microphone 21 are in a relatively static or small-amplitude vibration state, thereby greatly reducing the occurrence of howling.

Example 5:

referring to fig. 13 and 14, the present application differs from embodiment 1 in that the microphone holder 4 includes a ring-shaped sleeve 43 and a cushion sleeve 44, the ring-shaped sleeve 43 is disposed in a hollow manner and is snap-fitted with the positioning post 5 on the housing 1, the positioning post 5 is disposed in a hollow manner, and in other embodiments, the ring-shaped sleeve 43 may be connected with the positioning post 5 by using an adhesive. The cushion collar 44 and the annular collar 43 are both made of elastic material, and the annular collar 43 is used for mounting the dual-directional microphone 21.

Referring to fig. 13 and 14, in the present embodiment, the cushion cover 44 includes a first mounting cover 441, a second mounting cover 442, and a third mounting cover 443, the first mounting cover 441 and the second mounting cover 442 are integrally coupled, and the first mounting cover 441 is mounted on the annular cover 43. The transverse axes of the first and second mounting

sleeves

441, 442 are parallel and perpendicular to the longitudinal axis of the annular sleeve 43, and the third mounting sleeve 443 is mounted on the second mounting sleeve 442 with the longitudinal axis of the third mounting sleeve 443 perpendicular to the transverse axis of the second mounting sleeve 442.

Referring to fig. 3 and 4, the dual-directional microphone 21 is mounted in the second mounting sleeve 442 or the first mounting sleeve 441, and the number of the mounting sleeves can be selected according to actual needs, but the number and the shape of the mounting sleeves can be adapted to the dual-directional microphone 21. The unidirectional microphone 22 is mounted in the third mounting sleeve 443, but the axis of the sound-collecting surface of the unidirectional microphone 22 is perpendicular to the axis of the horn 3 as long as the number and shape of the third mounting sleeves 443 are adapted to the unidirectional microphone 22. In practical situations, the position of the microphone 22 can be adjusted according to practical situations, but the effect of accurately acquiring the sound of the user can be achieved when the microphone 22 is arranged at any position. The first mounting sleeve 441 and the positioning column 5 are both hollow, so that the wires of the unidirectional microphone 22 and the bidirectional microphone 21 can be led out conveniently, and the wires can be electrically connected with the main control circuit of the housing 1 conveniently.

Principle of example 5: when the loudspeaker 3 on the opposite side of the shell 1 produces sound, the sound with the same frequency and the phase angle difference of 180 degrees is diffused to the vibrating diaphragm of the double-direction microphone 21, and because the sound on the two sides of the vibrating diaphragm has the same frequency, the same amplitude and the phase angle difference of 180 degrees, the vibration of the vibrating diaphragm is relatively small at the moment, or the vibrating diaphragm is in a relatively static state under a proper condition, aiming at the situation, the sound with the same frequency can be effectively prevented from being input and amplified again, so that the squealing degree can be effectively reduced, and the tone quality and volume of the shell 1 can be improved. And the presence of the microphone 22 with single direction can better acquire the voice of the user, thereby improving the tone quality and volume of the shell 1.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A sound and microphone integrated device for effectively suppressing howling is characterized in that: including casing (1), casing (1) is equipped with the miaow head subassembly, the miaow head subassembly includes two directional miaow heads (21), casing (1) is equipped with loudspeaker (3) more than at least one, when one or more loudspeaker (3) sent the sound of same frequency, the distance that two adapterization mouths of two directional miaow heads (21) were passed to sound equals to can make the vibrating diaphragm of two directional miaow heads (21) be in relative quiescent condition.

2. An acoustic microphone integrated apparatus for effectively suppressing howling as claimed in claim 1, wherein: still including setting up master control circuit in casing (1), the miaow head subassembly still includes single directional miaow head (22), the pickup orientation of single directional miaow head (22) and the axial contained angle of the integrative equipment of stereo set microphone are less than 30 to supply single directional miaow head (22) to acquire user's sound in the longitudinal direction, single directional miaow head (22) with respectively input master control circuit after two directional miaow head (21) pickup and handle separately.

3. An acoustic microphone integrated apparatus for effectively suppressing howling as claimed in claim 2, wherein: the axis of single directional miaow head (22) and the axis of two directional miaow heads (21) form spacing contained angle, spacing contained angle supplies external user can be single directional miaow head (22) and two directional miaow heads (21) to acquire the people's voice of more angles, spacing contained angle is greater than 70 and is less than 110.

4. An acoustic microphone integrated apparatus for effectively suppressing howling as claimed in claim 2, wherein: the microphone assembly further comprises a microphone support (4), and the microphone support (4) is used for mounting the double-directional microphone (21) and/or the single-directional microphone (22) so as to buffer vibration brought by the shell (1).

5. An acoustic microphone integrated apparatus for effectively suppressing howling according to any one of claims 1 to 4, wherein: when the loudspeakers (3) are arranged in pairs, each pair of loudspeakers (3) is arranged on two sides of the shell (1) and is in a mirror axial symmetry relationship.

6. An acoustic microphone integrated apparatus for effectively suppressing howling according to any one of claims 1 to 4, wherein: the loudspeaker (3) is an active loudspeaker or a passive loudspeaker, and the active loudspeaker is electrically connected with a main control circuit in the shell (1) so as to enable the active loudspeaker to work.

7. An acoustic microphone integrated apparatus for effectively suppressing howling according to any one of claims 1 to 4, wherein: the double-directional microphone (21) is a microphone of a capacitive electret.

8. An acoustic microphone integrated apparatus for effectively suppressing howling according to any one of claims 2 to 4, wherein: the single-direction microphone (22) is a capacitance type microphone or a moving coil type microphone, and the sensitivity of the single-direction microphone (22) is lower than that of the double-direction microphone (21).

9. An acoustic microphone integrated apparatus for effectively suppressing howling according to any one of claims 2 to 4, wherein: the axis of the sound receiving surface of the single-direction microphone (22) and the axis of the sound playing direction of the horn (3) form a preset angle, and the preset angle is larger than 60 degrees and smaller than 120 degrees.

10. An acoustic microphone integrated apparatus for effectively suppressing howling as claimed in claim 3, wherein: the limiting included angle comprises 90 degrees.