CN211830910U

CN211830910U - Video camera and audio/video system

Info

Publication number: CN211830910U
Application number: CN202020346680.3U
Authority: CN
Inventors: 钱锋海
Original assignee: Zhejiang Dahua Technology Co Ltd
Current assignee: Zhejiang Dahua Technology Co Ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-10-30
Anticipated expiration: 2030-03-18

Abstract

The utility model relates to a camera and audio-visual system, the device includes directional microphone, all directional microphone, casing and controller, set up perpendicularly between directional microphone and the all directional microphone and all install in the casing, the controller couples with directional microphone and all directional microphone respectively; the directional microphone is arranged towards the target equipment and used for acquiring equipment sound signals of the target equipment, the full directional microphone is used for acquiring the human sound signals and the set sound signals of the target equipment, and the controller can filter the equipment sound signals from the set sound signals and acquire the human sound signals. Through the utility model discloses, the problem that camera thickness is big among the correlation technique has been solved, the thickness of camera has been reduced.

Description

Video camera and audio/video system

Technical Field

The utility model relates to a camera technical field especially relates to a camera and audio-visual system.

Background

An Internet Protocol Television (IPTV) utilizes an IP broadband network, takes a television and a set top box as main terminal equipment, and provides broadband value-added services of interactive multimedia services including television programs for users. With the rapid development of the broadband construction in China, the IPTV is in explosive growth in China, and the use of the IPTV for video call, video yearly and the like becomes a popular social mode.

In the traditional technology, the IPTV camera does not have an echo cancellation function, and the IPTV camera is arranged above a television, when speakers at the left side and the right side of the television play the voice of the other side during voice talkback, the echo is picked up again by a microphone of the camera, so that the quality of the call is reduced.

In the directional sound pickup technology of the related art, the camera of the IPTV performs noise filtering after calculating an incident angle of a sound source and a target-to-noise ratio by arranging two full-directional microphones in parallel and then calculating a time difference from the sound source to the two full-directional microphones. However, in the above solution, the two fully directional microphones are not only arranged in parallel, but also the distance between the two fully directional microphones is far enough (above 5 cm), which causes a problem of large camera thickness.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model provides a camera and audio-visual system for solve the big problem of camera thickness among the correlation technique.

In a first aspect, the present invention provides a camera, the camera includes: the directional microphone comprises a fixed directional microphone 20, a full directional microphone 30, a shell 10 and a controller, wherein the fixed directional microphone 20 and the full directional microphone 30 are vertically arranged and are all arranged in the shell 10, and the controller is respectively coupled with the fixed directional microphone 20 and the full directional microphone 30; the directional microphone 20 is disposed toward a target device and is configured to acquire a device sound signal of the target device, the omni-directional microphone 30 is configured to acquire a human sound signal and an aggregate sound signal of the target device, and the controller is capable of filtering the device sound signal from the aggregate sound signal and acquiring the human sound signal.

In a possible implementation, a first sound pickup hole 101 is provided on the housing 10, and the directional microphone 20 is disposed toward the first sound pickup hole 101.

In a possible implementation manner, the housing 10 is further provided with a first accommodating cavity 102 communicating with the first sound pickup hole 101, and a first step portion 103 is formed between the first accommodating cavity 102 and the first sound pickup hole 101; the directional microphone 20 is accommodated in the first accommodating cavity 102 and abuts against the first step part 103.

In a possible implementation manner, the fixed directional microphone 20 is a single directional microphone, and the number of the first sound-collecting holes 101 is one.

In a possible implementation manner, the fixed directional microphone 20 is a dual directional microphone, the number of the first sound-pickup holes 101 is two, and the dual directional microphone is disposed between the two first sound-pickup holes 101.

In a possible implementation, the housing 10 is provided with a second sound pickup hole 104, and the fully directional microphone 30 is disposed toward the second sound pickup hole 104.

In a possible implementation manner, the housing 10 further has a second accommodating cavity 105 communicating with the second sound pickup hole 104, and a second step 106 is formed between the second accommodating cavity 105 and the second sound pickup hole 104; the directional microphone 20 is accommodated in the second accommodating cavity 105 and abuts against the second step part 106.

In one possible implementation, the distance between the fixed directional microphone 20 and the fully directional microphone 30 is less than or equal to 5 millimeters.

In a second aspect, the present invention further provides an audio/video system, including a target device and a camera; in a possible implementation manner, the target device is a television, and the camera is any one of the cameras.

In one possible implementation, the distance between the television and the camera is less than or equal to 20 centimeters; alternatively, an acute angle formed between the first sound-collecting hole 101 of the camera and the television horn is less than or equal to 60 °.

The utility model provides a camera and audio-visual system, through setting up directional microphone, all directional microphone, casing and controller, the directional microphone of deciding is perpendicular to be set up and all installed in the casing between directional microphone of deciding and all, the controller is coupled with directional microphone of deciding and all directional microphone respectively; the directional microphone is arranged towards the target equipment and used for acquiring equipment sound signals of the target equipment, the full directional microphone is used for acquiring the human sound signals and the set sound signals of the target equipment, and the controller can filter the equipment sound signals from the set sound signals and acquire the human sound signals. The problem of camera thickness is big among the correlation technique is solved, the thickness of camera has been reduced.

The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below to provide a more concise and understandable description of other features, objects, and advantages of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a front cross-sectional view of a camera according to an embodiment of the present invention;

fig. 2 is a side cross-sectional view of a camera according to an embodiment of the invention;

fig. 3 is a schematic structural diagram of a controller according to an embodiment of the present invention;

fig. 4 is a schematic view of a mounting structure of a directional microphone according to an embodiment of the present invention;

fig. 5 is a schematic view of an erroneous mounting structure of a directional microphone according to an embodiment of the present invention;

fig. 6 is a polar diagram of a dual directional microphone in accordance with an embodiment of the present invention;

fig. 7 is a schematic view of a mounting structure of a omni-directional microphone according to an embodiment of the present invention;

fig. 8 is a polar diagram of a omni-directional microphone according to an embodiment of the present invention.

The reference numbers in the figures are as follows: 10. a housing; 101. a first sound pickup hole; 102. a first accommodating cavity; 103. a first step portion; 104. a second sound pickup hole; 105. a second accommodating cavity; 106. a second step portion; 20. a directional microphone is fixed; 30. a fully directional microphone.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

In the present invention, a camera is provided in an embodiment, fig. 1 is a front cross-sectional view of a camera according to an embodiment of the present invention, fig. 2 is a side cross-sectional view of a camera according to an embodiment of the present invention, as shown in fig. 1 and fig. 2, the camera includes:

a fixed directional microphone 20, a full directional microphone 30, a housing 10 and a controller (not shown in fig. 1 and 2), wherein the fixed directional microphone 20 and the full directional microphone 30 are vertically arranged and are all arranged in the housing 10, and the controller is respectively coupled with the fixed directional microphone 20 and the full directional microphone 30; the directional microphone 20 is disposed toward a target device (e.g., a television) and is used to acquire a device sound signal of the target device, the omni-directional microphone 30 is used to acquire a human sound signal and an aggregate sound signal of the target device, and the controller is capable of filtering the device sound signal from the aggregate sound signal and acquiring the human sound signal.

In the embodiment, the fixed directional microphone 20 and the fully directional microphone 30 are vertically arranged, and then the controller filters the device sound in the collected sound signal to achieve a mode of directionally picking up the human sound signal, so that the pickup holes corresponding to the fixed directional microphone 20 and the fully directional microphone 30 do not need to be arranged on the same straight line, the problem of large thickness of the camera caused by parallel arrangement of the two fully directional microphones 30 in the related art is solved, and the thickness of the camera is reduced.

In this embodiment, the method for filtering out the target device sound in the aggregate sound signal by the controller belongs to the prior art. For example, in the prior art, the principle of sound wave superposition cancellation is utilized, after a device sound of a target device picked up by the directional microphone 20 is specified, the picked-up device sound is inverted in phase, and then the picked-up device sound is superposed with an aggregate sound picked up by the all-directional microphone 30, so that human voice signal pickup is realized.

In a preferred embodiment, in order to secure the noise reduction effect of the camera, the distance between the fixed-direction microphone 20 and the full-direction microphone 30 may be set to be less than or equal to 5 mm, wherein the noise reduction effect is better as the distance between the fixed-direction microphone 20 and the full-direction microphone 30 is smaller.

The embodiment of the present invention provides a structure of a controller, fig. 3 is a schematic structural diagram of a controller according to the embodiment of the present invention, as shown in fig. 3, the controller includes: a first operational amplifier circuit, a second operational amplifier circuit, a third operational amplifier circuit and a feedback-preventing operational circuit, wherein the input end of the first operational amplifier circuit is coupled to the output end of the fixed-direction microphone 20, the input end of the second operational amplifier circuit is coupled to the output end of the fully-directional microphone 30, the output end of the first operational amplifier circuit and the output end of the second operational amplifier circuit are both coupled to the feedback-preventing operational circuit, and the feedback-preventing operational circuit is coupled to the third operational circuit, wherein the first operational amplifier circuit is used for amplifying the device sound signal of the target device acquired by the fixed-direction microphone 20, the second operational amplifier circuit is used for amplifying the human sound signal acquired by the fully-directional microphone 30 and the aggregate sound signal of the target device, the feedback-preventing operational circuit filters the sound signal input by the fixed-direction microphone 20 from the aggregate sound signal acquired by the fully-directional microphone 30 by operating the two paths of sound signals, therefore, the effect of directionally picking up the voice signal of the target equipment is achieved, the voice call quality is improved, and the third operational amplification circuit is used for amplifying the voice signal of the target equipment directionally picked up.

It should be noted that, in addition to the above noise filtering manner, in the related art, in this embodiment, the controller may further obtain a first signal of the omni-directional microphone 30 and a second signal of the fixed directional microphone 20, perform a first preset process on the first signal and the second signal to obtain a first processed signal and a second processed signal, calculate an amplitude difference and a phase difference between the first processed signal and the second processed signal according to the second processed signal, perform frequency point classification on the first processed signal according to the amplitude difference and the phase difference to obtain a classification spectrum, perform a second preset process on the classification spectrum to obtain a filtered signal, and generate an output signal according to the filtered signal and the first signal. It should be noted that, in this embodiment, the first preset processing may be a fourier transform, a fourier series, or the like, the first signal may be an aggregate sound signal, and the second signal may be an equipment sound signal.

In the related art, the controller may further respectively obtain an aggregate sound signal of the omnidirectional microphone 30 and an equipment sound signal of the directional microphone 20, and then determine the sounding time of the human voice according to a sound pressure difference and a sound voltage of the aggregate sound signal and the equipment sound signal, so as to cut off the background environment noise, only the human voice is retained, and a better sound expression effect is achieved when recording or voice conversation is performed.

In one embodiment, a first pick-up hole 101 is provided on the housing 10 of the camera, and the pointing microphone 20 is provided towards the first pick-up hole 101. In order to make the camera beautiful and to secure the sensitivity of the pointing microphone 20, the aperture size of the first sound-pickup hole 101 is preferably 1/5 to 1/4 which is the diameter size of the pointing microphone, for example, the diameter size of the pointing microphone 20 is 6 mm, and the aperture size of the first sound-pickup hole may be 1.2 mm.

The embodiment of the present invention provides an installation structure of a directional microphone 20, fig. 4 is a schematic view of an installation structure of a directional microphone 20 according to the embodiment of the present invention, as shown in fig. 4, a first accommodating cavity 102 communicating with a first sound pickup hole 101 is further formed on the housing 10, and a first step portion 103 is formed between the first accommodating cavity 102 and the first sound pickup hole 101; the pointing microphone 20 is accommodated in the first accommodating cavity 102 and abuts against the first step portion 103. In the present embodiment, in order to ensure the sound collecting effect of the directional microphone 20, the size of the directional microphone 20 should be consistent with the size of the first receiving cavity 102, so that there is no gap between the directional microphone 20 and the first receiving cavity 102, and it is avoided that a cavity is formed between the directional microphone 20 and the first receiving cavity 102, which causes the cavity to resonate sound of certain frequencies, thereby changing the frequency characteristic of the directional microphone 20. Mounting arrangements such as that shown in fig. 5 are not permissible.

In one embodiment, the pointing microphone 20 may be a single-directional microphone, and then the number of the first pickup hole 101 is one, and the pointing microphone 20 is disposed toward the first pickup hole 101.

In one embodiment, the fixed directional microphone 20 may also be a dual directional microphone, and then the number of the first sound-pickup holes 101 is two, and the dual directional microphone is disposed between the two first sound-pickup holes 101.

It should be noted that the directional microphone may be a differential pressure type microphone, and the interior of the directional microphone is provided with a sound absorbing material, and the polarity diagram of the dual directional microphone adopted in the embodiment of the present invention is shown in fig. 6, and the polarity diagram is similar to the 8-shaped form.

The embodiment of the present invention further provides a mounting structure of a omni-directional microphone 30, fig. 7 is a schematic view of the mounting structure of the omni-directional microphone 30 according to the embodiment of the present invention, as shown in fig. 7, it is also possible to pass through the second sound pickup hole 104 on the housing 10 of the camera, and the omni-directional microphone 30 faces the second sound pickup hole 104.

In the present embodiment, the number of the second pickup holes 104 is preferably one.

It should be noted that the sensitivity of the omni-directional microphone 30 is equal in any direction at the same distance, the structure thereof is completely sealed on the Printed Circuit Board (PCB), the sound pressure can only enter from the second sound-collecting hole 104 corresponding to the omni-directional microphone 30, and the omni-directional microphone 30 is preferably a pressure type microphone, and the polar diagram of the omni-directional microphone 30 adopted in the embodiment of the present invention is shown in fig. 8.

In the present embodiment, in order to implement the installation of the omnidirectional microphone 30, a second accommodating cavity 105 communicating with the second sound pickup hole 104 may be opened on the housing 10 of the camera, and a second step 106 is formed between the second accommodating cavity 105 and the second sound pickup hole 104; the pointing microphone 20 is accommodated in the second accommodating cavity 105 and abuts against the second step 106. In the present embodiment, in order to ensure the sound pickup effect of the omni-directional microphone 30, the size of the omni-directional microphone 30 should be consistent with that of the second accommodating cavity 105, so that no gap exists between the omni-directional microphone 30 and the second accommodating cavity 105, and it is avoided that a cavity is formed between the omni-directional microphone 30 and the second accommodating cavity 105, and the cavity resonates with sound of some frequencies, thereby changing the frequency characteristic of the omni-directional microphone 30.

The embodiment of the present invention provides an audio-visual system, which includes a target device and a camera, wherein the target device can be a tv, and the camera is the camera related to the above embodiment. Through inciting somebody to action the utility model relates to a camera is installed on the TV set, has realized picking up the orientation of people's acoustic signal when conversing to the TV set, has guaranteed voice conversation quality.

In one embodiment, the distance between the television and the camera is less than or equal to 20 centimeters; alternatively, the acute angle formed between the first pick-up hole 101 of the camera and the television horn is less than or equal to 60 °.

In the present embodiment, the noise reduction effect of the camera can be improved by setting the distance between the television and the camera to be less than or equal to 20 cm, wherein the smaller the distance between the television and the camera, the better the noise reduction effect. The acute angle formed between the first sound pick-up hole 101 of the camera and the television horn can be smaller than or equal to 60 degrees, wherein the smaller the acute angle formed between the first sound pick-up hole 101 of the camera and the television horn, the better the noise reduction, and preferably, when the first sound pick-up hole 101 of the camera and the television horn are on the same straight line, the best noise reduction effect is achieved.

It should be noted that the first operational amplifier circuit and the second operational amplifier circuit in the controller can adjust the amplification factor of the audio signal according to the placement positions of the fixed-direction microphone 20 and the full-direction microphone 30 according to their own automatic adjustment functions, so as to improve the noise reduction effect of the camera.

Furthermore, when the user uses the audio-visual system and is away from the camera by 30 cm, the audio-visual system starts to reduce the noise of the television, and preferably, when the user is away from the camera by 50 cm, the noise reduction function of the audio-visual system is optimal.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A camera, characterized in that the camera comprises: the directional microphone comprises a fixed directional microphone (20), a full directional microphone (30), a shell (10) and a controller, wherein the fixed directional microphone (20) and the full directional microphone (30) are vertically arranged and are arranged in the shell (10), and the controller is respectively coupled with the fixed directional microphone (20) and the full directional microphone (30);

the directional microphone (20) is arranged towards a target device and used for acquiring a device sound signal of the target device, the full directional microphone (30) is used for acquiring a human sound signal and an aggregate sound signal of the target device, and the controller can filter the device sound signal from the aggregate sound signal and acquire the human sound signal.

2. A camera according to claim 1, characterized in that the housing (10) is provided with a first pick-up aperture (101), the directional microphone (20) being arranged towards the first pick-up aperture (101).

3. The camera according to claim 2, wherein the housing (10) further has a first accommodating cavity (102) communicating with the first pick-up hole (101), and a first step (103) is formed between the first accommodating cavity (102) and the first pick-up hole (101); the directional microphone (20) is accommodated in the first accommodating cavity (102) and abuts against the first step part (103).

4. A camera according to claim 2, characterized in that the directional microphone (20) is a single directional microphone and the number of first pick-up holes (101) is one.

5. A camera according to claim 2, characterized in that the directional microphone (20) is a double directional microphone, the number of the first pick-up holes (101) being two, the double directional microphone being arranged between two of the first pick-up holes (101).

6. A camera according to claim 1, characterized in that the housing (10) is provided with a second pick-up aperture (104), the fully directional microphone (30) being arranged towards the second pick-up aperture (104).

7. The camera according to claim 6, wherein the housing (10) further defines a second receiving cavity (105) communicating with the second pick-up hole (104), and a second step (106) is formed between the second receiving cavity (105) and the second pick-up hole (104); the directional microphone (20) is accommodated in the second accommodating cavity (105) and abuts against the second step part (106).

8. A camera according to claim 1, characterized in that the distance between the fixed directional microphone (20) and the fully directional microphone (30) is less than or equal to 5 mm.

9. A video and audio system comprises a target device and a camera; characterised in that the target device is a television and the camera is a camera according to any one of claims 1 to 8.

10. The audio visual system of claim 9, wherein the distance between the television and the camera is less than or equal to 20 centimeters; alternatively, the first and second electrodes may be,

an acute angle formed between a first pick-up hole (101) of the camera and the television horn is less than or equal to 60 degrees.