CN203966555U - A kind of audio frequency and video switching control - Google Patents

A kind of audio frequency and video switching control Download PDF

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Publication number
CN203966555U
CN203966555U CN201420328091.7U CN201420328091U CN203966555U CN 203966555 U CN203966555 U CN 203966555U CN 201420328091 U CN201420328091 U CN 201420328091U CN 203966555 U CN203966555 U CN 203966555U
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China
Prior art keywords
video
audio
switch circuit
audio frequency
frequency
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Expired - Fee Related
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CN201420328091.7U
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Chinese (zh)
Inventor
屠永波
陈广
鄢洪辉
蒋海秋
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Ningbo Soundking Electronic Co Ltd
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Ningbo Soundking Electronic Co Ltd
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Priority to CN201420328091.7U priority Critical patent/CN203966555U/en
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Abstract

The utility model provides a kind of audio frequency and video switching control, belongs to audio frequency and video control technology field.This audio frequency and video switching control comprises frequency switch circuit, video switch circuit, the digital audio and video signals processing element coupling with described frequency switch circuit, and the main control unit coupling with described frequency switch circuit, video switch circuit and digital audio and video signals processing element respectively; Described main control unit enables to control described frequency switch circuit and video switch circuit is switchably operated in karaoke mode or video play mode.This audio frequency and video switching control can be to the centralized control of the audio frequency and video output of requesting song module, voice input module and video playback module, and switching controls is convenient, and manipulation is simple, contributes to very much to expand function and the application scenario of amusement equipment.

Description

A kind of audio frequency and video switching control
Technical field
The utility model belongs to audio frequency and video control technology field, relates in particular to a kind of audio frequency and video switching control being switchably operated under karaoke mode or video play mode.
Background technology
At present, many public situation among a small circle, in the time having a meeting, sing amusement, dancing party, film broadcasting, all adopt separately independently entertainment systems to realize, and these systems are all to adopt the mode of temporarily building to realize; For example, when meeting, need to adopt power amplifier and microphone etc., while singing amusement, need to adopt song-order machine, power amplifying device, microphone etc., film need to adopt DVD and projector etc. while broadcasting.The establishment of this entertainment systems is a relative loaded down with trivial details process with overlap joint, wiring is numerous, and need debugging, layman cannot operate at all, and be difficult to realize multifunction, like this, limit the function of public situation party, for example, the entertainment systems that is used for the party of singing amusement can not be realized video display broadcasting, for before the entertainment systems of having a meeting meeting in session, meeting or can not realize after the meeting amusement function, the entertainment systems of playing for video display can not be used for the functions such as realization Karaoke, small-sized interim dancing party.Therefore, independently entertainment systems can not be suitable for the multifunctional application demand of similar public situation completely separately, is unsuitable for enriching the masses' culture life requirement, poor user experience.
But, the above and these shortcomings be mainly because the independence of these entertainment systems causes, therefore, in the urgent need to a kind of audio frequency and video switching device shifter, multiple audio frequency, vision signal are switched to output to realize centralized control to multiple entertainment systems.
Utility model content
The purpose of this utility model is, realizes the centralized control of the audio frequency and video output to the module of at least requesting a song, voice input module and video playback module, thereby switches quickly and easily between karaoke mode and video play mode.
For realizing above object or other objects, the utility model provides a kind of audio frequency and video switching control, and it comprises:
Frequency switch circuit;
Video switch circuit;
The digital audio and video signals processing element coupling with described frequency switch circuit; And
The main control unit coupling with described frequency switch circuit, video switch circuit and digital audio and video signals processing element respectively;
Wherein, described frequency switch circuit connects outside requesting song module, video playback module, voice input module to receive from the first sound signal of described requesting song module and voice input module and from the second sound signal of described video playback module, and described video switch circuit connects outside requesting song module and video playback module to receive from described requesting song module the first vision signal with from the second vision signal of described video playback module;
Described main control unit enables to control described frequency switch circuit and video switch circuit is switchably operated in karaoke mode or video play mode; Under described karaoke mode, described frequency switch circuit selects described the first sound signal of output to described digital audio and video signals processing element, and described video switch circuit is selected described the first vision signal of output; Under described video play mode, described frequency switch circuit selects described the second sound signal of output to described digital audio and video signals processing element, and described video switch circuit is selected described the second vision signal of output.
Alternatively, described digital audio and video signals processing element can be digital signal processor.
According to the audio frequency and video switching control of the utility model one embodiment, wherein, between described digital audio and video signals processing element and described frequency switch circuit, be provided with A/D converter.
Preferably, audio frequency and video switching control comprises audio output and video output terminals, between described audio output and described digital audio and video signals processing element, is provided with D/A.
Particularly, described audio output couples outside power amplifier output module.
According to the also audio frequency and video switching control of an embodiment of the utility model, wherein, described audio frequency and video switching control is provided with Audio conversion key and video switch key, described in while pressing described Audio conversion key, audio frequency and video switching control is operated under karaoke mode, while pressing described video switch key described in audio frequency and video switching control be operated under video play mode.
Alternatively, described Audio conversion key and video switch key are arranged to a key, thereby a key of realizing between karaoke mode and video play mode switches.
Preferably.Described Audio conversion key and video switch key correspondence are arranged on the telepilot and/or touch-screen as the actuation means of audio frequency and video switching control.
Particularly, described touch-screen and described main control unit is wired couples, described telepilot and described main control unit is wireless couples.
Particularly, described requesting song module is song-order machine, and described video playback module is DVD disc player, and described voice input module is radio microphone device.
Technique effect of the present utility model is, this audio frequency and video switching control is the selection output of control inputs audio or video easily, be conducive to the multiple multimedia equipment of concentrated controling management, for example, the centralized control of the audio frequency and video output to requesting song module, voice input module and video playback module, thus can between karaoke mode and video play mode, switch quickly and easily easily.This audio frequency and video switching control contributes to expand function and the application scenario of amusement equipment very much, and easy to use, and manipulation is simple, is very beneficial for improving user's experience of amusement equipment.
Brief description of the drawings
From following detailed description by reference to the accompanying drawings, will make above and other object of the present utility model and advantage more complete clear, wherein, same or analogous key element adopts identical label to represent.
Fig. 1 is according to the modular structure schematic diagram of the audio frequency and video switching control of the utility model one embodiment.
Fig. 2 is the structural representation of the audio frequency and video control system of the applied embodiment of audio frequency and video switching control embodiment illustrated in fig. 1.
Fig. 3 is the annexation schematic diagram between the switching control of audio frequency and video shown in Fig. 1 and other modules of its audio frequency and video control system.
Embodiment
What introduce below is some in multiple possibility embodiment of the present utility model, aims to provide basic understanding of the present utility model, is not intended to confirm key of the present utility model or conclusive key element or limits claimed scope.Easily understand, according to the technical solution of the utility model, do not changing under connotation of the present utility model other implementations that one of ordinary skill in the art can propose mutually to replace.Therefore, below embodiment and accompanying drawing be only the exemplary illustration to the technical solution of the utility model, and should not be considered as of the present utility model all or be considered as restriction or the restriction to technical solutions of the utility model.
In the utility model, Karaoke refer to the musical background of pre-recording on storage medium in broadcasting, there is no leading singer's voice simultaneously, showing the synchronous lyrics that have beat prompting of playing on fluorescent screen, participant can see the lyrics and hold microphone singing on one side under this pattern; Video playback refers to as user provides continuous video playback and watches for user.It will be appreciated that, although also there is video playback in karaoke mode,, karaoke mode is focused on user's the experience of singing, and video play mode is focused on user's viewing experience, and therefore common video play mode is more focused on the readability of video playback.Karaoke mode and video play mode can be expanded along with the expansion of their function its definition category.
Figure 1 shows that according to the modular structure schematic diagram of the audio frequency and video switching control of the utility model one embodiment; Figure 2 shows that the structural representation of the audio frequency and video control system of the applied embodiment of audio frequency and video switching control embodiment illustrated in fig. 1; Figure 3 shows that the annexation schematic diagram between the switching control of audio frequency and video shown in Fig. 1 and other modules of its audio frequency and video control system.While being applied to audio frequency and video control system below in conjunction with the audio frequency and video switching control of the utility model embodiment, its structure, principle, function are schematically illustrated.
First as shown in Figure 2, in the audio frequency and video control system 10 of this embodiment, include display 10, requesting song module 12, video playback control module 13, audio frequency and video switching control 14 as shown in Figure 1, voice input module 15, power amplifier output module 16, be preferably also provided with terminal box 17 and drawer box 18.Wherein, display 10, requesting song module 12, video playback control module 13, audio frequency and video switching control 14, voice input module 15, power amplifier output module 16, terminal box 17 and drawer box 18 by concentrated setting in rack 19, like this, the overall integrated setting of audio frequency and video control system 10, very convenient entirety carrying between each occasion.
The bottom of rack 19 is provided with some feets 193, is used for fixing and supports this audio frequency and video control system 10 in the time of audio frequency and video control system 10 job applications.Preferably, bottom at rack 19 is also provided with roller (not shown in figure 1), to facilitate the entirety carrying of audio frequency and video control system 10, in the time of audio frequency and video control system 10 job applications, roller is retracted and is fixed on the bottom of rack 19, in the time that entirety is carried, feet 193 is by unsettled and this audio frequency and video control system 10 of roller supporting.
Display 11 is arranged on the upper end of rack 19, and in this embodiment, upper cover 191 upwardly-openables of rack 19 also can be fixed on a certain open angle fixed support by contractile support bar 192.Preferably, display 11 by its support bar (not shown) collapsible be loaded in rack 19, thereby, in the time not using, can by upper cover 191, audio frequency and video control system 10 all parts or module lock be put in rack 19 easily, in use, as shown in Figure 1, display 11 can be necessarily to facilitate visual angle upwards to open, and the angle of the upper surface of its relative rack 19 can regulate setting.
The shape of rack 19 can be rectangular shape, still, needs to understand and be, shape, material and the size of rack 19 can be according to specific requirement and respective design, and they are not restrictive.The parts that are separated with rack 19 that drawer box 18 can be used for loading audio frequency and video control system 10, for example, microphone, telepilot, connecting line etc., thereby convenient carrying easy to use.
In this embodiment, display 11 is preferably touch-screen, therefore, it not only can be as the output block of audio frequency and video control system 10, can also be used as input block, on the interface of touch-screen, user can conveniently realize the operations such as switching controls, requesting song, video playback.The keyboard of audio frequency and video switching control 14 (as shown in Figure 1 147) can be realized by the virtual key on touch-screen, preferably, on touch-screen, be at least provided with Audio conversion key and video switch key, they are used for controlling audio frequency and video switching control 14, for example, so that audio frequency and video control system 10 is operated in karaoke mode or video play mode (video display broadcasting), its concrete function and realize principle will thereafter introduce.
In this embodiment, requesting song module 12 can be for being mainly used in providing the similarly device such as song-order machine of Kara OK function, and requesting song module 12 is built-in with memory module, and it is at least for storing song related content.Alternatively, this memory module can be arranged on to plug in requesting song module 12, like this, if need to upgrade the content of storing in memory module, can extract this memory module, accessed outside other computers, from the content of its memory module is managed and/or is upgraded, and preferably, memory module is operationally carried out content update by the network of access.The concrete storage media types of memory module, memory capacity and/or storage song content etc. are not restrictive.
The input media of requesting song module 12 can be realized by the virtual key of touch-screen in this embodiment, thereby in the time that audio frequency and video control system 10 is operated in karaoke mode, can control it by the touch-screen of display 10 easily, for example request a song, cut the operations such as song, user experiences, intuitively, operability is good.Preferably, requesting song module 12 disposes global function function of infrared remote control, in the time that audio frequency and video control system 10 is operated in karaoke mode, also can realize the control operation to requesting song module 12 by the telepilot of audio frequency and video control system 10, for example request a song, cut the operations such as song.In other embodiments, requesting song module 12 can also couple with other intelligent hand-held terminal radio communications, such as IPOD, IPAD and smart mobile phone etc., thus can carry out control operation with similar intelligent hand-held terminal to requesting song module 12 with expanding.
In this embodiment, video playback module 13 can be the video disc playing device of similar DVD, Apparatus for video CD, it can be, but not limited to support BD, DVD, VCD, CD video disc, for example, video playback module 13 can be high definition blue light DVD player, its band multichannel Doby (Duby) 7.1 sound channel surround decoder systems, the full HD image quality of the highest support 1080P, supports the former dish file of blue light BD broadcasting etc.Preferably, video playback module 13 is with Internet video playing function and external hard disk playing function; For realizing external hard disk playing function, on this video disc playing device for the USB interface of external external hard disk, thereby facilitate in displaying video playing module 13 not other entrained video contents of user of storage; For realizing Internet video playing function, on this video disc playing device, can be provided with the network interface for access network, and be built-in with memory module, for example hard disk, and this memory module is operationally carried out video content renewal by the network of access; This memory module also can be arranged on to plug in video playback module 13, like this, if need to upgrade the content of storing in memory module, can extract this memory module, accessed other outside computers, from the content of its memory module is managed and/or upgraded.The storage media types of the memory module of displaying video playing module 13, memory capacity, storage content are not restrictive.
The input media of video playback module 13 can pass through the virtual key of touch-screen (display 11) in this embodiment to be realized, thereby in the time that audio frequency and video control system 10 is operated in video play mode, can control it by the touch-screen of display 10 easily, for example, carry out the operations such as F.F., played in full screen.Preferably, video playback module 13 disposes global function function of infrared remote control, in the time that audio frequency and video control system 10 is operated in video play mode, also can realize the control operation to video playback module 13 by the telepilot of audio frequency and video control system 10, for example carry out F.F., volume adjusting operation.
In this embodiment, voice input module 15 can be, but not limited to the wireless microphone system into W202R-TH, and it disposes one or more microphones, for example, can be also wire microphone system.
In this embodiment, power amplifier output module 16 can be, but not limited to as AC1800 movie theatre power amplifier, AC1800 aims at the high-performance six sound channels movie system sound intensifier of small-sized fixing movie theatre design, there is wider voltage usable range, for example, voltage usable range is 160V-240V, can be suitable for the unsettled situation of remote area power supplies completely.And, there is perfect defencive function, for example there are start delayed startup, overheat protector, direct current protecting, short-circuit protection etc., thereby guarantee product in rugged environment and not damaged under maloperation condition, improve its reliability.The cooling system of AC1800 movie theatre power amplifier adopts the large discharge capacity blower fan of low noise of two-stage speed change, ensures that complete machine is operated under lower temperature conditions.
In this embodiment, audio frequency and video switching control 14 can work in karaoke mode or video play mode, thereby be switchably operated in karaoke mode or video play mode for controlling audio frequency and video control system 10, as shown in Figure 1, audio frequency and video switching control 14 comprises frequency switch circuit 141 and video switch circuit 142, frequency switch circuit 141 at least receives the such as microphone from voice input module 15(), requesting song module 12(such as song-order machine) sound signal 1-1 and from such as DVD of video playback module 13() sound signal 1-2, video switch circuit 142 at least receives from requesting song module 12(such as song-order machine) vision signal 2-1 and from such as DVD of video playback module 13() vision signal 2-2, it will be appreciated that, in the time that audio frequency and video control system 10 is integrated with other audio or video output devices, frequency switch circuit 141 and video switch circuit 142 can also be expanded the sound signal, the vision signal that receive respectively other types.
Continue as shown in Figure 1, the audio frequency and video switching control 14 of the utility model embodiment also comprises A/D converter 144, digital signal processor (Digital Signal Processer, DSP) 145 and D/A converter 146, the sound signal that frequency switch circuit 141 is exported is generally simulating signal, be converted to digital signal at A/D converter 144, and then in DSP145, carry out digital audio and video signals processing, for example can be, but not limited to postpone, the processing such as frequency division, reverberation, compression digital signal, prevent the sound signal distortion of output; The digital audio and video signals of DSP145 output is converted to simulated audio signal in D/A converter 146, and then export power amplifier output module 16 to, or can also export audio interface to, play thereby export to other stereo sets, for example, outside sound equipment as shown in Figure 3.External speakers can be according to the incompatible concrete option and installment of applied field.
Continue as shown in Figure 1, audio frequency and video switching control 14 is also provided with main control processing unit (MCU) 143, and MCU143 is for controlling the work of frequency switch circuit 141, video switch circuit 142 and DSP145, MCU143 can receive the instruction of the input equipment such as telepilot, keyboard on the one hand, the demonstration of display 11 is inputted and is controlled in the instruction that can also receive on the other hand the display 11 of touch-screen, carries out controlling after instruction process the work of frequency switch circuit 141, video switch circuit 142 and DSP145 in MCU, for example, user press Audio conversion key (can on telepilot or display 11 on) time, MCU enables frequency switch circuit 141, video switch circuit 142 and DSP145, make frequency switch circuit 141 selectively export the sound signal 1-1 from voice input module 15 and requesting song module 12, and the sound signal 1-2 of mute video playing module 13 output, simultaneously, if video switch circuit 142 is selectively exported from the vision signal 2-1(of requesting song module 12 to be had), and shielding is from the vision signal 2-2 output of video playback module 13, DSP145 is also enabled to carry out digital audio processing process by MCU143, user press video switch key (can on telepilot or this display 11 on) time, MCU enables frequency switch circuit 141, video switch circuit 142 and DSP145, frequency switch circuit 141 is selectively exported from the sound signal 1-2 of video playback module 13, the also sound signal 1-1 output of shielding requesting song module 12, meanwhile, video switch circuit 142 is selectively exported from the vision signal 2-2 of video playback module 13, also shielding is exported (if there is) from the vision signal 2-1 of requesting song module 12.
Video switch circuit 142 selects the vision signal (2-1 or 2-2) of output on display 11, to show, also can export the video output interface of audio frequency and video control system 10 to, pass through external display device, for example, projector 92 as shown in Figure 3 etc., realize the video playback capability of theater type.
It will be appreciated that, on telepilot and/or touch-screen, Audio conversion key and video switch key can be two independently keys, in other embodiments, also can be arranged to a key, thereby a key of realizing between karaoke mode and video play mode switches.
In this embodiment, as shown in Figures 2 and 3, for reducing audio frequency and video control system 10 wiring work in use, the terminal box 17 of having gone back concentrated setting in rack 19, as shown in Figure 3,17a is depicted as the positive interface of terminal box 17, and 17b is depicted as the interface at the back side of terminal box 17; The interface at the back side is connected for for example, carrying out wiring with other internal modules (video playback module 13, voice input module 15, power amplifier output module 16, audio frequency and video switching control 14) of audio frequency and video control system 10, this is conventionally integrated in rack 19, and be fixedly connected with, positive interface is for being connected with the external component of audio frequency and video control system 10 and for accessing power supply, network signal etc., thereby without numerous and diverse wiring, also convenient with the wiring of external unit, be easy to the multi-functional entertainment systems of fast construction.
On the front of terminal box 17, be provided with video output interface, audio output interface, network interface and the power interface of audio frequency and video control system 10, wherein, power interface external power supply, can be display module 11, requesting song module 12, video playback module 13, voice input module 15, power amplifier output module 16 and the unified power supply of audio frequency and video switching control 14 by the power module wherein arranging, and arrange power switch can be set on the front of terminal box 17, for example DZ47-60-C10-2P air switch, thus safe reliability improved.Video output interface can external projector 92 etc.Terminal box 17 receives from the audio frequency output of audio frequency and video switching control 14 and video output, and sound signal can export outside stereo set to by audio output interface, and vision signal can export outside display device to by video output interface.
In another embodiment, the front of terminal box 17 is also provided with lamp control interface, Karaoke module 12 can be exported acoustic control lamp light signal by accompanying audio signal, and this acoustic control lamp light signal is selected to export to the lamp control interface of terminal box 17 under karaoke mode by audio frequency and video switching control 14.Connect by connecting line and outside acoustic control lamp photosystem, can control acoustic control lamp photosystem, thereby the perfection that can be issued to sound, light, audiovisual at karaoke mode is enjoyed.
Therefore, audio frequency and video switching control based on the utility model embodiment is the selection output of control inputs audio or video easily, be conducive to the multiple multimedia equipment of concentrated controling management, for example, song-order machine, DVD disc player etc., contribute to expand function and the application scenario of amusement equipment, and easy to use, manipulation is simple, is very beneficial for improving user's experience of amusement equipment.
The audio frequency and video control system 10 that audio frequency and video switching control based on the utility model embodiment is built formation is example, not only can realize the video playback capability of Kara OK function, theater type, and easy switching, and manipulation is simple; And wiring is simple, very easy to use, carry also very conveniently, be easy to realize mobile movie theatre, recreation center function flows.This audio frequency and video control system 10 can be, but not limited to be applicable to following applications: (1) network on-line meeting and training (particularly in outdoor occasion); (2) the online digital movie of network and relevant entertainment are play; (3) karaoke and the dancing party of outdoor or indoor scenarios; (4) occasion of assembling a crowd such as wedding celebration, dinner party; (5) place such as publicity such as the canteen culture of NGO etc.; (6) the political culture recreation place of Basic Government tissue etc.
To understand, herein, " on ", the directional terminology such as D score, " front ", " reverse side " is to define with respect to the orientation of audio frequency and video control system in accompanying drawing, these directional terminology are relative concepts, they for respect to description and clarification, it can be the variation in the orientation of placing and correspondingly changing according to audio frequency and video control.
To understand, when it is said that when parts be ' attach ' to another parts, it can be directly connected to another parts maybe can exist intermediate member.
Above example has mainly illustrated audio frequency and video switching control of the present utility model.Although only some of them embodiment of the present utility model is described, those of ordinary skill in the art should understand, and the utility model can be implemented not departing from its purport and scope with many other forms.Therefore, the example of showing and embodiment are regarded as illustrative and not restrictive, and in the situation that not departing from the utility model spirit as defined in appended each claim and scope, the utility model may be contained various amendments and replacement.

Claims (10)

1. an audio frequency and video switching control, is characterized in that, comprising:
Frequency switch circuit;
Video switch circuit;
The digital audio and video signals processing element coupling with described frequency switch circuit; And
The main control unit coupling with described frequency switch circuit, video switch circuit and digital audio and video signals processing element respectively;
Wherein, described frequency switch circuit connects outside requesting song module, video playback module, voice input module to receive from the first sound signal of described requesting song module and voice input module and from the second sound signal of described video playback module, and described video switch circuit connects outside requesting song module and video playback module to receive from described requesting song module the first vision signal with from the second vision signal of described video playback module;
Described main control unit enables to control described frequency switch circuit and video switch circuit is switchably operated in karaoke mode or video play mode; Under described karaoke mode, described frequency switch circuit selects described the first sound signal of output to described digital audio and video signals processing element, and described video switch circuit is selected described the first vision signal of output; Under described video play mode, described frequency switch circuit selects described the second sound signal of output to described digital audio and video signals processing element, and described video switch circuit is selected described the second vision signal of output.
2. audio frequency and video switching control as claimed in claim 1, is characterized in that, described digital audio and video signals processing element is digital signal processor.
3. audio frequency and video switching control as claimed in claim 1, is characterized in that, between described digital audio and video signals processing element and described frequency switch circuit, is provided with A/D converter.
4. audio frequency and video switching control as claimed in claim 3, is characterized in that, audio frequency and video switching control comprises audio output and video output terminals, between described audio output and described digital audio and video signals processing element, is provided with D/A.
5. audio frequency and video switching control as claimed in claim 4, is characterized in that, described audio output couples outside power amplifier output module.
6. audio frequency and video switching control as claimed in claim 1, it is characterized in that, described audio frequency and video switching control is provided with Audio conversion key and video switch key, described in while pressing described Audio conversion key, audio frequency and video switching control is operated under karaoke mode, while pressing described video switch key described in audio frequency and video switching control be operated under video play mode.
7. audio frequency and video switching control as claimed in claim 6, is characterized in that, described Audio conversion key and video switch key are arranged to a key, thereby a key of realizing between karaoke mode and video play mode switches.
8. the audio frequency and video switching control as described in claim 6 or 7, is characterized in that, described Audio conversion key and video switch key correspondence are arranged on the telepilot and/or touch-screen as the actuation means of audio frequency and video switching control.
9. audio frequency and video switching control as claimed in claim 8, is characterized in that, described touch-screen and described main control unit is wired couples, described telepilot and described main control unit is wireless couples.
10. audio frequency and video switching control as claimed in claim 1, is characterized in that, described requesting song module is song-order machine, and described video playback module is DVD disc player, and described voice input module is radio microphone device.
CN201420328091.7U 2014-06-19 2014-06-19 A kind of audio frequency and video switching control Expired - Fee Related CN203966555U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105225678A (en) * 2014-06-19 2016-01-06 宁波音王电声股份有限公司 A kind of audio frequency and video switching control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105225678A (en) * 2014-06-19 2016-01-06 宁波音王电声股份有限公司 A kind of audio frequency and video switching control

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