CN214281645U - Sound pickup device - Google Patents
Sound pickup device Download PDFInfo
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- CN214281645U CN214281645U CN202120178397.9U CN202120178397U CN214281645U CN 214281645 U CN214281645 U CN 214281645U CN 202120178397 U CN202120178397 U CN 202120178397U CN 214281645 U CN214281645 U CN 214281645U
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Abstract
The utility model provides a pickup device, include: the system comprises an omnidirectional microphone, a directional microphone, a dual-channel amplification module, a switching module, a noise reduction module and a control module; the output end of the omnidirectional microphone and the output end of the directional microphone are respectively connected with the two input ends of the dual-channel amplification module; two output ends of the double-channel amplification module are respectively connected with two input ends of the switching module; the control end of the switching module is connected with the output end of the control module; the output end of the switching module is connected with the input end of the noise reduction module; and the output end of the noise reduction module is used for outputting the collected sound signal. The utility model discloses a control module can switch between omnidirectional microphone and directional microphone, can be applicable to complicated pickup scene.
Description
Technical Field
The utility model relates to an audio frequency technical field, concretely relates to pickup device.
Background
The sound pickup is also called a listening head. The sound pick-up is an electronic device used for collecting the sound of the site environment and then transmitting the collected sound to the back-end equipment, and comprises a microphone and an audio amplification circuit. The directivity characteristic of a common sound pickup is generally omni-directional, and sound in the direction of 360 degrees around the sound pickup, namely target source sound or surrounding disordered ambient sound, can be picked up by the sound pickup. Sometimes, in the use scene of the sound pick-up, only specific information of a target sound source needs to be concerned, and a directional sound pick-up needs to be used. The directional sound pick-up has certain directionality, and the sound signal that directional sound pick-up directive direction was picked up is strong, and the sound signal of other directions is weak.
Therefore, the existing sound pickup has a single function and cannot be applied to a complex sound pickup scene. It is sometimes not foreseeable in engineering practice which sound pick-up is required. In some application scenarios, directional sound pick-up is needed in some time periods, and omnidirectional sound pick-up is needed in other time periods.
SUMMERY OF THE UTILITY MODEL
Problem to among the prior art, the utility model provides a pickup apparatus can realize that the qxcomm technology picks up and directional picking up, can be applicable to complicated pickup scene.
In order to achieve the above object, the utility model provides a following technical scheme:
a sound pickup apparatus comprising: the system comprises an omnidirectional microphone, a directional microphone, a dual-channel amplification module, a switching module, a noise reduction module and a control module;
the output end of the omnidirectional microphone and the output end of the directional microphone are respectively connected with the two input ends of the dual-channel amplification module;
two output ends of the double-channel amplification module are respectively connected with two input ends of the switching module;
the control end of the switching module is connected with the output end of the control module;
the output end of the switching module is connected with the input end of the noise reduction module; and the output end of the noise reduction module is used for outputting the collected sound signal.
Further, still include: an isolated output module;
the input end of the isolation output module is connected with the output end of the noise reduction module;
the isolation output module is used for performing isolation conversion on the noise reduction signal and outputting the signal subjected to the isolation conversion to the network camera.
Wherein the control module comprises: a key switch circuit and a control interface circuit;
one end of the key switch circuit is respectively connected with a power supply end and a control end of the switching module, and the other end of the key switch circuit is connected with a grounding end;
one end of the control interface circuit is connected with the control end of the switching module, and the other end of the control interface circuit is connected with the output end of the network camera.
Wherein, the key switch circuit includes: the dial switch and the first current-limiting resistor;
one end of the first current-limiting resistor is connected with a power supply end, and the other end of the first current-limiting resistor is respectively connected with the switching module and one end of the dial switch; the other end of the dial switch is connected with the grounding end.
Wherein the control interface circuit comprises: the second current limiting resistor, the third current limiting resistor and the light emitting diode;
the second current-limiting resistor, the third current-limiting resistor and the light-emitting diode are connected in series, and the other end of the light-emitting diode is connected with the grounding end after the light-emitting diode is connected in series; the other end of the second current-limiting resistor is connected with a power supply end; one end and the grounding end of the second current limiting resistor are respectively connected with two ends of the output interface of the network camera.
Further, still include: a power conversion module;
two input ends of the power conversion module are respectively connected with alternating current and direct current, and an output end of the power conversion module is respectively connected with a power end of the double-channel amplification module, a power end of the switching module and a power end of the noise reduction module.
The power conversion module is connected with the POE switch through a first RJ45 interface; and the power supply conversion module receives the direct current output by the POE switch.
The power supply conversion module is connected with the network camera through a second RJ45 interface; and the power supply conversion module outputs the direct current output by the POE switch to the network camera.
The switching module is an NC7SZ157 chip or a 74LS153 chip.
Further, still include: a status indicator light;
the switching module controls to output an amplified signal of the first audio signal, and the state indicator lamp is in a lamp-out state; the switching module controls the amplified signal of the output second audio signal, and the state indicator light is in a light-on state.
According to the above technical scheme, the utility model provides a pickup device can switch between omnidirectional microphone and directional microphone through control module, can be applicable to complicated pickup scene.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a first structure of a sound pickup apparatus according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a sound pickup apparatus according to an embodiment of the present invention;
fig. 3 is a schematic view of a third structure of a sound pickup apparatus according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a key switch circuit in the sound pickup apparatus according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a control interface circuit in the sound pickup apparatus according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a switching module in the sound pickup apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are 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.
The embodiment of the utility model provides a pickup device, see fig. 1, this pickup device specifically includes: the system comprises an omnidirectional microphone, a directional microphone, a dual-channel amplification module, a switching module, a noise reduction module and a control module;
the output end of the omnidirectional microphone and the output end of the directional microphone are respectively connected with the two input ends of the dual-channel amplification module;
two output ends of the double-channel amplification module are respectively connected with two input ends of the switching module;
the control end of the switching module is connected with the output end of the control module;
the output end of the switching module is connected with the input end of the noise reduction module; and the output end of the noise reduction module is used for outputting the collected sound signal.
In this embodiment, the omnidirectional microphone can pick up sounds in different directions with a good balance, and is suitable for picking up sound signals in a large area. Directional microphones are more powerful than collecting sound signals in one direction. Structurally, the two microphones are arranged in a semicircular metal mesh cover.
The two-channel amplification module is used for receiving a first audio signal collected by the omnidirectional microphone and a second audio signal collected by the directional microphone;
the control module outputs a control signal to the switching module; the switching module controls and outputs an amplified signal of the first audio signal or an amplified signal of the second audio signal to the noise reduction module according to the control signal;
and the noise reduction module is used for carrying out noise reduction processing on the amplified signal to obtain a noise reduction signal.
The pickup device comprises a directional microphone and an omnidirectional microphone, and signals of the two microphones are connected into the switching module after the two-channel amplification module. The level output by the control module determines which microphone signal is output by the switching module. For example: when the output of the control module is high level, the directional microphone signal is selected to be output; when the output is low, the omni-directional microphone signal is selected to be output.
The signal output by the switching module is sent to a noise reduction module (for example, an AGC amplifying audio noise reduction circuit) for noise reduction processing. The further output noise-reduced signal can be sent to an isolation balance output circuit to be output to a monitoring camera.
Further, referring to fig. 2, on the basis of the above, the method further includes: an isolated output module;
the input end of the isolation output module is connected with the output end of the noise reduction module;
the isolation output module is used for performing isolation conversion on the noise reduction signal and outputting the signal subjected to the isolation conversion to the network camera. In the embodiment, the signal (audio signal) output after the isolation conversion adopts the balanced output with isolation, and the signal polarity does not need to be distinguished when the signal (audio signal) is connected with a camera, so that the construction is convenient.
Further, referring to fig. 3, on the basis of the above, the method further includes: a power conversion module;
the power supply conversion module is used for converting or reducing the voltage of the received alternating current or direct current to obtain working direct current, and outputting the working direct current to the dual-channel amplification module, the switching module and the noise reduction module.
The power conversion module is connected with the POE switch through a first RJ45 interface; and the power supply conversion module receives the direct current output by the POE switch. The power supply conversion module is connected with the network camera through a second RJ45 interface; and the power supply conversion module outputs the direct current output by the POE switch to the network camera.
It should be noted that PIN PINs corresponding to the first RJ45 interface and the second RJ45 interface are directly connected one to one, so as to provide data and power paths for the POE switch and the network camera. The functions of the first RJ45 interface and the second RJ45 interface may be interchanged.
Further, the method also comprises the following steps: a status indicator light;
the switching module controls to output an amplified signal of the first audio signal, and the state indicator lamp is in a lamp-out state; the switching module controls the amplified signal of the output second audio signal, and the state indicator light is in a light-on state.
In this embodiment, the status indicator light indicates which microphone is collecting sound.
In the above embodiments, the control module includes: a key switch circuit and a control interface circuit;
one end of the key switch circuit is respectively connected with a power supply end and a control end of the switching module, and the other end of the key switch circuit is connected with a grounding end;
one end of the control interface circuit is connected with the control end of the switching module, and the other end of the control interface circuit is connected with the output end of the network camera.
The key switch circuit is used for generating a control signal through a key;
the control interface circuit is used for receiving switching signals output by the network camera and generating control signals according to the switching signals; the control signals include: a high level signal and a low level signal.
In the present embodiment, referring to fig. 4, the key switch circuit includes: a toggle switch SW1 and a first current limiting resistor R2;
one end of the first current limiting resistor R2 is connected with a power supply end, and the other end of the first current limiting resistor R2 is respectively connected with the switching module and one end of the dial switch SW 1; the other end of the dial switch SW1 is connected to ground.
In the present embodiment, referring to fig. 5, the control interface circuit includes: a second current limiting resistor R28, a third current limiting resistor R30 and a light emitting diode D13;
the second current-limiting resistor R28, the third current-limiting resistor R30 and the light-emitting diode D13 are connected in series, and the other end of the light-emitting diode D13 is connected with the ground terminal after the series connection; the other end of the second current limiting resistor R28 is connected with a power supply end; one end and the grounding end of the second current limiting resistor R28 are respectively connected with two ends of the output interface of the network camera.
Referring to fig. 6, in the present embodiment, the key switch circuit and the control interface circuit are combined in a circuit diagram. Two ends of the dial switch SW1 are respectively connected with two ends of the output interface of the network camera, and the first current limiting resistor R2 is deleted due to the repeated functions of the first current limiting resistor R2 and the second current limiting resistor R28.
Specifically, the switching module is an NC7SZ157 chip or a 74LS153 chip.
The output of the switching module is used to select the microphone signal. The control can be realized by a manual switch (a dial switch SW1) or by an output port of the network camera. When the manual switch is closed, the output of the switching module is at a low level, and the omnidirectional microphone signal is selected to be output.
When the manual switch is disconnected, the output level of the network camera alarm port connected with the port P2A/P2B determines which microphone is selected to output. When the camera alarm port outputs high level, the output of the switching module is low level, and the omnidirectional microphone signal is selectively output. When the camera alarm port outputs low level, the output of the switching module is high level, and the directional microphone signal is selectively output.
The switching module includes a status indicator light (led D13) that is illuminated when the directional microphone signal is selected for output. When the omnidirectional microphone signal is selected to be output, the state indicator lamp is turned on and off.
The pickup can be powered by 12VDC/24 VAC/POE. When POE power supply is adopted, one of two RJ45 connectors of the sound pick-up is connected with a POE network switch, and the other connector is connected with a POE network camera. When the sound pick-up obtains the power through the network cable, the POE switch is not influenced to be the POE network camera, and the data transmission between the POE network switch and the POE network camera is not influenced.
The specific application scene can be in a classroom, and when the device is used in the classroom, the device can be used for recording and broadcasting teaching at ordinary times, and directionally points to a teacher to pick up sound. During the national education examination, be used for the electron to patrol and examine, the omnidirectional type is used for hall internal environment pickup, classroom environment pickup. Both the directional and omnidirectional modes of the same area are used, and the specific number of each is not very accurate in advance. The pickup facilitates purchase management.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention is not limited to any single aspect, nor is it limited to any single embodiment, nor is it limited to any combination and/or permutation of these aspects and/or embodiments. Moreover, each aspect and/or embodiment of the present invention may be used alone or in combination with one or more other aspects and/or embodiments thereof.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (10)
1. A sound pickup apparatus, comprising: the system comprises an omnidirectional microphone, a directional microphone, a dual-channel amplification module, a switching module, a noise reduction module and a control module;
the output end of the omnidirectional microphone and the output end of the directional microphone are respectively connected with the two input ends of the dual-channel amplification module;
two output ends of the double-channel amplification module are respectively connected with two input ends of the switching module;
the control end of the switching module is connected with the output end of the control module;
the output end of the switching module is connected with the input end of the noise reduction module; and the output end of the noise reduction module is used for outputting the collected sound signal.
2. The sound pickup apparatus according to claim 1, further comprising: an isolated output module;
the input end of the isolation output module is connected with the output end of the noise reduction module;
the isolation output module is used for performing isolation conversion on the noise reduction signal and outputting the signal subjected to the isolation conversion to the network camera.
3. The pickup apparatus of claim 2, wherein the control module comprises: a key switch circuit and a control interface circuit;
one end of the key switch circuit is respectively connected with a power supply end and a control end of the switching module, and the other end of the key switch circuit is connected with a grounding end;
one end of the control interface circuit is connected with the control end of the switching module, and the other end of the control interface circuit is connected with the output end of the network camera.
4. The pickup apparatus according to claim 3, wherein the key switch circuit comprises: the dial switch and the first current-limiting resistor;
one end of the first current-limiting resistor is connected with a power supply end, and the other end of the first current-limiting resistor is respectively connected with the switching module and one end of the dial switch; the other end of the dial switch is connected with the grounding end.
5. The pickup apparatus according to claim 3, wherein the control interface circuit comprises: the second current limiting resistor, the third current limiting resistor and the light emitting diode;
the second current-limiting resistor, the third current-limiting resistor and the light-emitting diode are connected in series, and the other end of the light-emitting diode is connected with the grounding end after the light-emitting diode is connected in series; the other end of the second current-limiting resistor is connected with a power supply end; one end and the grounding end of the second current limiting resistor are respectively connected with two ends of the output interface of the network camera.
6. The pickup apparatus according to claim 2, further comprising: a power conversion module;
two input ends of the power conversion module are respectively connected with alternating current and direct current, and an output end of the power conversion module is respectively connected with a power end of the double-channel amplification module, a power end of the switching module and a power end of the noise reduction module.
7. The pickup apparatus of claim 6, wherein the power conversion module is connected to the POE switch via a first RJ45 interface; and the power supply conversion module receives the direct current output by the POE switch.
8. The pickup device as claimed in claim 7, wherein the power conversion module is connected to the webcam through a second RJ45 interface; and the power supply conversion module outputs the direct current output by the POE switch to the network camera.
9. The sound pickup device as claimed in claim 1, wherein the switching module is NC7SZ157 chip or 74LS153 chip.
10. The sound pickup apparatus according to claim 1, further comprising: a status indicator light;
the switching module controls to output an amplified signal of the first audio signal, and the state indicator lamp is in a lamp-out state; the switching module controls the amplified signal of the output second audio signal, and the state indicator light is in a light-on state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120178397.9U CN214281645U (en) | 2021-01-22 | 2021-01-22 | Sound pickup device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120178397.9U CN214281645U (en) | 2021-01-22 | 2021-01-22 | Sound pickup device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214281645U true CN214281645U (en) | 2021-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120178397.9U Active CN214281645U (en) | 2021-01-22 | 2021-01-22 | Sound pickup device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214281645U (en) |
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2021
- 2021-01-22 CN CN202120178397.9U patent/CN214281645U/en active Active
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