CN117915145A

CN117915145A - Screen casting method, large screen equipment, screen casting equipment and screen casting system

Info

Publication number: CN117915145A
Application number: CN202410131087.XA
Authority: CN
Inventors: 迟博麒
Original assignee: Beijing Jingdong Century Trading Co Ltd; Beijing Wodong Tianjun Information Technology Co Ltd
Current assignee: Beijing Jingdong Century Trading Co Ltd; Beijing Wodong Tianjun Information Technology Co Ltd
Priority date: 2024-01-30
Filing date: 2024-01-30
Publication date: 2024-04-19

Abstract

The disclosure relates to a screen projection method, a large screen device, a screen projection device and a screen projection system, wherein the method applied to the large screen device comprises the following steps: receiving a screen-throwing starting instruction; according to the screen throwing starting instruction, determining target ultrasonic carrier wave information corresponding to the large-screen equipment; coding the screen-throwing code information of the large-screen equipment based on the target ultrasonic carrier wave information to obtain a target ultrasonic carrier wave signal; broadcasting a target ultrasonic carrier signal based on an audio module of the large screen device, so that the target ultrasonic carrier signal is transmitted to a screen throwing device in a space where the large screen device is located; and receiving the screen projection data from the screen projection equipment and performing screen projection display based on the established screen projection data link. Transmitting and receiving screen-throwing code information based on ultrasonic waves, and conveniently and rapidly establishing a screen-throwing data link; the directional connection between the screen throwing equipment and the large screen equipment can be realized, and the mutual interference in the screen throwing code information broadcasting process of a plurality of large screen equipment based on ultrasonic waves can be reduced or even avoided.

Description

Screen casting method, large screen equipment, screen casting equipment and screen casting system

Technical Field

The disclosure relates to the technical field of screen projection, in particular to a screen projection method, large-screen equipment, screen projection equipment and a screen projection system.

Background

The screen throwing technology is widely applied to various scenes, taking a conference scene as an example, large screen equipment for displaying conference contents is arranged in a conference room, and the large screen equipment generally comprises a control host and a large screen display screen; the electronic equipment can be used by the lecturer, and the playing content on the electronic equipment is projected to the large-screen equipment for playing, so that the electronic equipment is convenient for the participants to watch.

In the process of implementing the disclosed concept, the inventor finds that at least the following technical problems exist in the related art: in some scenes, the control host of the large-screen device is usually attached with two-dimensional code information for screen projection, or screen projection information is provided in the software description of the large-screen device, and when the large-screen device is required to be used for screen projection, a user usually adopts own device (such as a notebook computer or a mobile phone, which is described as screen projection device) to scan the two-dimensional code on the control host or input the screen projection information in the software description of the large-screen device to establish screen projection connection and perform screen projection display on the large-screen device; the method needs to transmit and identify the screen information in the form of the two-dimension code based on the internet communication mode, and the connection establishment process is slower under the condition of poor network signals, so that the use experience of users is affected; in some schemes, manual input of screen throwing information is needed, and input errors are easy to generate in the mode, so that the screen throwing connection is failed to influence the progress of screen throwing playing.

Disclosure of Invention

In order to solve the technical problems described above or at least partially solve the technical problems described above, embodiments of the present disclosure provide a method for projecting a screen, a large-screen device, a screen projecting device, and a screen projecting system.

In a first aspect, embodiments of the present disclosure provide a method of screening. The method is applied to the large-screen equipment and comprises the following steps: receiving a screen-throwing starting instruction; determining the target ultrasonic carrier wave information corresponding to the large-screen equipment according to the screen-throwing starting instruction; based on the target ultrasonic carrier information, carrying out coding processing on screen-throwing code information of the large-screen equipment to obtain a target ultrasonic carrier signal; broadcasting the target ultrasonic carrier signal based on the audio module of the large screen device, so that the target ultrasonic carrier signal is transmitted to a screen throwing device in a space where the large screen device is located; the screen-throwing code information is used for establishing a screen-throwing data link between the large screen equipment and the screen-throwing equipment; and receiving the screen projection data from the screen projection equipment based on the established screen projection data link and performing screen projection display.

According to an embodiment of the present disclosure, the above-mentioned target ultrasonic carrier information is used for distinguishing large screen devices in different spaces in at least one dimension of amplitude or frequency. According to the screen-throwing starting instruction, determining the target ultrasonic carrier wave information corresponding to the large-screen equipment comprises the following steps: determining a target space where the large screen equipment is located according to the screen throwing starting instruction; determining a target ultrasonic carrier frequency band corresponding to the target space according to a mapping table between the space and the ultrasonic carrier frequency band; the mapping table stores the corresponding relation among the space, the large screen equipment and the ultrasonic carrier frequency band; and determining the target ultrasonic power or the target ultrasonic amplitude corresponding to the large screen equipment according to the area information and the space construction information of the space where the large screen equipment and the screen throwing equipment are positioned.

According to an embodiment of the present disclosure, based on the target ultrasonic carrier information, encoding the screen-projection code information of the large-screen device to obtain a target ultrasonic carrier signal, including: determining the pairing identification frequency in the target ultrasonic carrier frequency band as a sequence head; the pairing identification frequency is used for distinguishing the identification frequency of large-screen equipment in different spaces; analyzing the screen-throwing code information into a character string corresponding to a preset system; generating a sequence body for encoding the character string according to the encoding frequency used for encoding the character of the preset system in the target ultrasonic carrier frequency band; the corresponding coding frequencies of the different characters of the preset system have preset frequency intervals; splicing the sequence header and the sequence body to obtain a coding frequency sequence; modulating the amplitude of the code frequency sequence to the target ultrasonic amplitude or modulating the power of the code frequency sequence to the target ultrasonic power; the coded frequency sequence obtained after modulation is used as a target ultrasonic carrier signal.

According to an embodiment of the present disclosure, in the above correspondence, there is at least one of the following cases: under the condition that different first large-screen equipment and second large-screen equipment in the same space carry out the same content screen projection, the first large-screen equipment and the second large-screen equipment have the same target ultrasonic carrier frequency band; or under the condition that different first large-screen equipment and second large-screen equipment in the same space independently throw screens, the first large-screen equipment and the second large-screen equipment have different target ultrasonic carrier wave frequency bands; or in the case that the first space and the second space are different spaces, and the third large screen device in the first space and the fourth large screen device in the second space perform independent screen projection, the target ultrasonic power or the target ultrasonic amplitude of the third large screen device meets the following conditions: the signal transmission distance in the first space is met, and the signal is attenuated to be below a first preset threshold value after reaching the second space; the target ultrasonic power or the target ultrasonic amplitude of the fourth large-screen device meets the following conditions: the signal transmission distance in the second space is met, and the signal transmission distance is attenuated to be below a second preset threshold value after reaching the first space; the third large-screen device and the fourth large-screen device have the same target ultrasonic carrier frequency band; or under the condition that a third large screen device in the first space and a fourth large screen device in the second space are used for independently projecting screens, the target ultrasonic power or the target ultrasonic amplitude of the third large screen device meets the following conditions: the signal transmission distance in the first space is met, and the signal is attenuated to be below a third preset threshold value after reaching the second space; the target ultrasonic power or the target ultrasonic amplitude of the fourth large-screen device meets the following conditions: the signal transmission distance in the second space is met, and the signal transmission distance is attenuated to be below a fourth preset threshold value after reaching the first space; the third large-screen device and the fourth large-screen device have different target ultrasonic carrier frequency bands; wherein the third preset threshold is greater than the first preset threshold, and the fourth preset threshold is greater than the second preset threshold.

According to an embodiment of the present disclosure, the different target ultrasound carrier frequency bands include one of the following: different target ultrasonic carrier frequency bands have different pairing identification frequencies; or different target ultrasonic carrier frequency bands have different pairing identification frequencies, and the pairing identification frequencies correspond to unique pairing groups; or different target ultrasonic carrier frequency bands have different pairing identification frequencies, and preset frequency intervals between coding frequencies for coding the characters in the preset system in the different target ultrasonic carrier frequency bands have differences; or different target ultrasonic carrier frequency bands have different pairing identification frequencies, and the pairing identification frequencies correspond to unique pairing groups; the preset frequency intervals between the coding frequencies used for coding the characters in the preset system in different target ultrasonic carrier frequency bands are different; the pairing group is formed by large-screen equipment and screen throwing equipment.

According to an embodiment of the present disclosure, the screen projection code information includes: the large screen device is arranged at the network address and the port number of the intranet, the intranet refers to the built local area network, and the traffic data of the network operation service side is not generated. The method further comprises the following steps: receiving a link establishment request initiated by screen throwing equipment; the link establishment request includes: the target large-screen equipment requiring connection is positioned at a target network address and a target port number of an intranet; the target network address and the target port number are obtained by analyzing the received target ultrasonic carrier signal by the screen throwing equipment; verifying the target network address and the target port number;

and under the condition that verification is passed, establishing a screen-throwing data link between the large-screen equipment and the screen-throwing equipment.

In a second aspect, embodiments of the present disclosure provide a method of screening. The method is applied to the screen throwing equipment and comprises the following steps: receiving at least one target ultrasonic carrier signal broadcast by large-screen equipment to be matched based on the audio module of the screen throwing equipment; analyzing and decoding the target ultrasonic carrier signal to obtain screen-throwing code information of at least one large-screen device to be matched; initiating a link establishment request according to screen-throwing code information of a target large-screen device to be screened, wherein the link establishment request is used for requesting to establish a screen-throwing data link between the screen-throwing device and the target large-screen device; and transmitting screen throwing data to the target large-screen equipment based on the established screen throwing data link.

According to an embodiment of the present disclosure, analyzing and decoding the target ultrasonic carrier signal to obtain screen projection code information of at least one large screen device to be matched, including: analyzing the signal head of the target ultrasonic carrier signal, and determining at least one large-screen device to be matched corresponding to the pairing identification frequency; decoding the signal body of the target ultrasonic carrier signal according to the coding frequency in the target ultrasonic carrier frequency band corresponding to the at least one large-screen device to be matched to obtain screen projection code information of the at least one large-screen device to be matched; wherein, the screen projection code information comprises: the large-screen equipment to be matched is arranged at the network address and the port number of the intranet, and the intranet refers to the built local area network and does not generate flow data of a network operation server.

In a third aspect, embodiments of the present disclosure provide a large screen apparatus. The large screen device includes: the device comprises an instruction receiving module, an ultrasonic carrier wave information determining module, a coding module, a signal sending module, a data receiving module and a display module. The instruction receiving module is used for receiving a screen throwing starting instruction. The ultrasonic carrier wave information determining module is used for determining the target ultrasonic carrier wave information corresponding to the large-screen equipment according to the screen throwing starting instruction. The encoding module is used for encoding the screen-throwing code information of the large-screen equipment based on the target ultrasonic carrier wave information to obtain a target ultrasonic carrier wave signal. The signal sending module is arranged in the audio module of the large screen device and is used for broadcasting the target ultrasonic carrier signal so that the target ultrasonic carrier signal is transmitted to the screen throwing device in the space where the large screen device is located; the screen-throwing code information is used for establishing a screen-throwing data link between the large screen equipment and the screen-throwing equipment. The data receiving module is used for receiving the screen projection data from the screen projection equipment based on the established screen projection data link. The display module is used for carrying out screen projection display based on the screen projection data.

In a fourth aspect, embodiments of the present disclosure provide a screen projection device. The screen projection device comprises: the system comprises a signal receiving module, a decoding module, a link establishing module and a data transmitting module. The signal receiving module is arranged in the audio module of the screen throwing device and is used for receiving at least one target ultrasonic carrier signal to be matched with the large screen device. The decoding module is used for analyzing and decoding the target ultrasonic carrier signal to obtain screen projection code information of at least one large-screen device to be matched. The link establishment module is used for initiating a link establishment request according to screen-throwing code information of a target large-screen device to be screened, and the link establishment request is used for requesting to establish a screen-throwing data link between the screen-throwing device and the target large-screen device. The data sending module is used for sending the screen throwing data to the target large-screen equipment based on the established screen throwing data link.

In a fifth aspect, embodiments of the present disclosure provide a screen projection system. The screen projection system comprises: large screen equipment and screen throwing equipment. The large screen device is used for executing the space screen projection method provided by the embodiment of the first aspect or is provided for the embodiment of the third aspect; the above-mentioned screen projection device is used for executing the method for spatial screen projection provided by the embodiment of the second aspect, or is provided for the embodiment of the fourth aspect.

The technical scheme provided by the embodiment of the disclosure at least has part or all of the following advantages:

The screen-throwing code information is transmitted between the large screen device and the screen-throwing device based on the ultrasonic wave with the frequency larger than 20kHz, so that the transmission and the reception of the screen-throwing code information can be effectively realized by using the respective audio modules (self-contained hardware devices) of the large screen device and the screen-throwing device, the ultrasonic wave can efficiently transmit signals in a short distance, the screen-throwing code information is not required to be transmitted based on the Internet communication mode, and the screen-throwing device can conveniently and rapidly establish a screen-throwing data link between the large screen device and the large screen device based on the screen-throwing code information; through determining the target ultrasonic carrier wave information corresponding to the large screen equipment, under the scene that one or more large screen equipment exists in one space or the large screen equipment in the adjacent multiple spaces is used for broadcasting the screen code information based on ultrasonic waves, corresponding coding processing of the screen code information is carried out based on the target ultrasonic carrier wave information corresponding to each large screen equipment, and a target ultrasonic carrier wave signal is obtained, so that the screen equipment can distinguish the large screen equipment in different spaces after receiving the target ultrasonic carrier wave signal, and corresponding screen throwing data links are established for the target large screen equipment needing to be thrown, directional connection between the screen throwing equipment and the large screen equipment is realized, and mutual interference in the process of simultaneously broadcasting the screen throwing code information based on the ultrasonic waves by the large screen equipment is reduced or even avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the related art will be briefly described below, and it will be apparent to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 schematically illustrates a system architecture and interaction diagram of a screen projection system of an embodiment of the present disclosure;

FIG. 2 schematically illustrates a flow chart of a method applied to a large screen device according to an embodiment of the present disclosure;

FIG. 3 schematically illustrates a detailed implementation flowchart of step S220, according to an embodiment of the present disclosure;

FIG. 4 schematically illustrates a detailed implementation flowchart of step S230 according to an embodiment of the present disclosure;

FIG. 5 schematically illustrates an interactive process timing diagram of a method of performing a screen throw with a large screen device according to an embodiment of the present disclosure;

FIG. 6 schematically illustrates a block diagram of a large screen apparatus according to an embodiment of the present disclosure;

fig. 7 schematically shows a block diagram of a screen projection apparatus according to an embodiment of the present disclosure.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are some, but not all, embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the disclosure, are within the scope of the disclosure.

A first exemplary embodiment of the present disclosure provides a screen projection system.

Fig. 1 schematically illustrates a system architecture and an interaction schematic of a screen projection system of an embodiment of the present disclosure.

Referring to fig. 1, a screen projection system 100 provided in an embodiment of the present disclosure includes: a large screen device 110 and a throw screen device 120. The large screen device 110 is used for executing the method for projecting a screen provided in the second embodiment, and the screen device 120 is used for executing the method for projecting a screen provided in the third embodiment.

In some implementations, the large screen device 110 refers to a device that is located in a certain enclosed space or open space and is used for receiving and displaying screen projection data, where the size of the display screen of the large screen device may vary and is limited by a minimum value. For example, the screen size of the large screen device is: the width is greater than a first set point (e.g., 0.8 meter, 0.9 meter, or 1 meter, the specific values may vary with industry standards or time evolution, the same follows) and the height is greater than a second set point (e.g., 1 meter); or the diagonal dimension is greater than the third set point (e.g., 40 inches). It can be appreciated that the screen projection system provided by the embodiments of the present disclosure may be applied to an enclosed space, such as a conference room, a living room, and the like; the screen projection system provided by the embodiment of the disclosure can also be applied to open spaces, such as stadiums, event arenas and the like.

In some implementations, the screen-casting device 120 refers to an electronic device that is located within a space and is used for screen-casting data transmission. The screen-casting device 120 itself can play the relevant content, and the large screen device 110 plays the corresponding content synchronously after establishing a connection (which will be described later as a screen-casting data link) with the screen-casting device 120.

The transmission of the screen code information is performed between the large screen device 110 and the screen throwing device 120 through ultrasonic waves. In some embodiments, the screen-casting code information carries a network address (e.g., an IP address) and a port number of the large-screen device 110 in the intranet; the intranet refers to a built local area network, and does not generate traffic data of a network operation service party, for example, a local office network built inside an enterprise, and does not need to call external services, so that traffic accessing the internet cannot be generated.

The screen throwing device 120 analyzes and decodes the screen throwing code information to obtain a corresponding network address and a port number, then establishes connection with the large screen device 110 through the local area network, and then the screen throwing device 120 transmits information streams (such as a slide PPT report, a video, a document, a picture and the like) played by the screen throwing device 120 to the large screen device 110 through the local area network for synchronous screen throwing and playing.

The large screen device 110 may be an electronic device or device system having a display (which may be a hardware display or a projection-type apparatus) and an audio module, and may include, for example, but not limited to: a conference integrated machine, a multimedia device, or a conference system including a microphone, a speaker, a display device, a hardware device such as a network connection device (e.g., a switch), and conference software, etc. The large screen device 110 may be provided with a screen-casting control class application for executing the method of screen casting provided in the second embodiment. The above-mentioned screen-throwing control class application can call the audio module N in the large-screen device 110, that is, has a call authority to the audio module N.

The screen-casting device 120 may be an electronic device having an audio module and a processing module, including but not limited to: smart phones, notebook computers, tablet computers, smart watches, wearable smart devices, and the like. The screen projection device 120 described above is installed with a screen projection type application for executing the screen projection method provided in the third embodiment described later. The above-mentioned screen-throwing application can call the audio module M in the screen throwing device 120, that is, has a call authority to the audio module M. It will be appreciated that other applications in the above-described screen-projection device 120 (e.g., music playing applications, voice navigation applications, etc.) may also have call rights to the audio module.

In related technologies, in some scenarios, two-dimensional code information for performing screen projection is usually attached to a control host of a large-screen device, or screen projection information is provided in a software description of the large-screen device, and when the large-screen device is required to be used for performing screen projection, a user usually uses his own device (such as a notebook computer or a mobile phone, and describes the device as screen projection device) to scan the two-dimensional code on the control host or input the screen projection information in the software description of the large-screen device to establish screen projection connection and perform screen projection display on the large-screen device; the method needs to transmit and identify the screen information in the form of the two-dimension code based on the internet communication mode, and the connection establishment process is slower under the condition of poor network signals, so that the use experience of users is affected; in some schemes, manual input of screen throwing information is needed, and input errors are easy to generate in the mode, so that the screen throwing connection is failed to influence the progress of screen throwing playing.

In the embodiment of the disclosure, only the audio modules of the large screen device 110 and the screen throwing device 120 are needed, so that the transmission and the reception of the screen throwing code information can be effectively realized by using the audio modules (self-contained hardware devices) of the large screen device and the screen throwing device, the ultrasonic wave can efficiently transmit signals in a short distance, the transmission of the screen throwing code information is not needed in a mode based on internet communication, the manual input of the screen throwing code information is not needed, and the screen throwing device can conveniently and rapidly establish a screen throwing data link with the large screen device based on the screen throwing code information.

Meanwhile, in the real scene, the requirements that a plurality of large screen devices can simultaneously throw the screen (can be the same content of throwing the screen or different contents of independent throwing the screen) under the control of at least one screen device in the same space, independent throwing of the screen is carried out by the respective large screen devices in the adjacent closed spaces and the like are considered, so that the screen throwing devices in the spaces can quickly throw the screen based on the near field transmission communication mode of ultrasonic waves and are not interfered by other ultrasonic broadcast signals, which is a key problem.

For example, in a conference scenario, there may be a situation that one or more conference rooms are simultaneously in a conference, and in a situation that a plurality of conference rooms are adjacent, it is possible that an ultrasonic carrier signal in one conference room is transmitted to another conference room, a screen projection device in another conference room receives the ultrasonic carrier signal, and how to distinguish the ultrasonic carrier signals for different controlled objects is a key problem in the encoding, transmitting and decoding of screen projection code information based on ultrasonic waves. In other words, how to enable a certain screen-throwing device to recognize screen-throwing code information corresponding to a target object to be established (namely, the target screen-throwing device) under the condition that a plurality of ultrasonic carrier signals from different large-screen devices in a conference room are simultaneously received is a key problem.

In view of this, as shown with reference to fig. 1, in some embodiments, the screen-casting control class application of the large screen device 110 performs the following steps or the large screen device 110 has functional modules (may be hardware modules or software modules, etc.) for implementing the following steps: receiving a screen-throwing starting instruction; determining the target ultrasonic carrier wave information corresponding to the large-screen equipment according to the screen-throwing starting instruction; based on the target ultrasonic carrier information, carrying out coding processing on screen-throwing code information of the large-screen equipment to obtain a target ultrasonic carrier signal; broadcasting the target ultrasonic carrier signal based on the audio module N of the large screen equipment, so that the target ultrasonic carrier signal is transmitted to the screen throwing equipment in the space where the large screen equipment is located; the screen-throwing code information is used for establishing a screen-throwing data link between the large screen equipment and the screen-throwing equipment; and receiving the screen projection data from the screen projection equipment based on the established screen projection data link and performing screen projection display. The well established drop data link is schematically represented by a lightning-like connection line in fig. 1, for example.

In some embodiments, the screen-casting class application in the screen-casting device 120 performs the following steps or the screen-casting device 120 has functional modules (may be hardware modules or software modules, etc.) for implementing the following steps: receiving a target ultrasonic carrier signal broadcast by at least one large-screen device to be matched based on the audio module M of the screen throwing device; analyzing and decoding the target ultrasonic carrier signal to obtain screen-throwing code information of at least one large-screen device to be matched; initiating a link establishment request according to screen-throwing code information of a target large-screen device to be screened, wherein the link establishment request is used for requesting to establish a screen-throwing data link between the screen-throwing device and the target large-screen device; and transmitting screen throwing data to the target large-screen equipment based on the established screen throwing data link.

The steps or more functional modules that are executed by the large-screen device 110 and the screen-projection device 120 in the first embodiment may be combined with the detailed description of the subsequent embodiments, and only the overall description of the system architecture in the first embodiment will be described, and the description will not be repeated.

A second exemplary embodiment of the present disclosure provides a method for screen casting applied to a large screen device.

Fig. 2 schematically illustrates a flowchart of a method applied to a large screen device according to an embodiment of the present disclosure.

Referring to fig. 2, the method for projecting a screen applied to a large screen device comprises the following steps: s210, S220, S230, S240, and S250.

In step S210, a screen-on start instruction is received.

For example, in an implementation scenario, the large screen device 110 and the screen device 120 are located in the same space and are both already in an activated state, the screen device 120 is used as a source body of the screen data, and the large screen device 110 is used as a receiving body of the screen data. The screen-throwing starting instruction can be that a screen-throwing starting button on the large-screen device is manually pressed or a screen-throwing starting function key is clicked, and the large-screen device is regarded as receiving the screen-throwing starting instruction. For example, the screen launch function key is a function key in a screen control class application of the large screen device 110.

In step S220, according to the above-mentioned screen-throwing start instruction, the target ultrasonic carrier wave information corresponding to the large-screen device is determined.

Considering that in a real scene, a plurality of large screen devices may exist in the same space and simultaneously screen-casting (which may be the same screen-casting content or different screen-casting content independently) under the control of at least one screen-casting device, and the requirements that the large screen devices in adjacent closed spaces independently screen-casting, etc. are met, how to enable the screen-casting devices in each space to rapidly screen-casting based on the near-field transmission communication mode of ultrasonic waves and not to be interfered by other ultrasonic broadcast signals is a key problem.

In view of this, the embodiments of the present disclosure provide for the targeted ultrasound carrier information for large screen devices that distinguish between different spaces.

The target ultrasonic carrier information is used for distinguishing large-screen equipment in different spaces in at least one dimension of amplitude or frequency. Because of the screen-throwing scene, in the case that a plurality of large-screen devices exist in one space, the screen-throwing code information of the large-screen devices in the local area network has differences, and the corresponding target ultrasonic carrier information can be the same. Under the condition that a plurality of large-screen devices exist in one space, the target ultrasonic carrier wave information corresponding to the large-screen devices in different spaces is different and is used for distinguishing different spaces.

In other embodiments, the targeted ultrasound carrier information may also be used to distinguish between different large screen devices within the same space in at least one dimension of amplitude or frequency. That is, different large-screen devices in the same space can also correspond to different target ultrasonic carrier wave information under the screen projection scene.

The space here may be an enclosed space or an open space, for which there is a physical barrier between different enclosed spaces. For the open space, the coverage of the open space may be divided into different spaces, for example, 1 to 100 meters along a certain direction (length direction, width direction, height direction, diameter direction, etc.) (specific numerical values may be changed or adjusted according to practical situations) or divided into one space within a certain space range, 101 to 200 meters divided into another space, etc., and so on.

Fig. 3 schematically illustrates a detailed implementation flowchart of step S220 according to an embodiment of the present disclosure.

In some embodiments, referring to fig. 3, in step S220, according to the screen-throwing start instruction, the target ultrasonic carrier information corresponding to the large-screen device is determined, and the method includes the following steps: s310, S320 and S330.

In step S310, according to the screen-throwing start instruction, a target space where the large screen device is located is determined.

In some embodiments, according to the screen-throwing starting instruction, the equipment number of the large-screen equipment can be positioned, and according to the equipment number, the inquiry is performed in a preconfigured equipment list, so that the space information of the target space where the large-screen equipment corresponding to the equipment number is located can be obtained. The device list stores information of devices included in the space. For example, the space is a plurality of conference rooms of an enterprise, the device list stores related information of large screen devices placed in each conference room of the plurality of conference rooms contained in the enterprise, for example, the device list contains the following information: { one layer conference room 1XX, area XXX, internal structure YYY-large screen device X11, large screen device X12; two-layer conference room 2X1, area X, internal structure Y-large screen device X201, large screen device X202; two-layer meeting room 2X2, area XX, internal structure YY-large screen device X211; … … }.

In step S320, determining a target ultrasonic carrier frequency band corresponding to the target space according to a mapping table between the space and the ultrasonic carrier frequency band; the mapping table stores the corresponding relation among the space, the large screen equipment and the ultrasonic carrier frequency band.

Step S320 is a determination of the target ultrasonic carrier information of the large-screen device in the frequency dimension in the target space.

Multiple large screen devices in the same space can have the same ultrasonic carrier frequency band; of course, it may be different. When the same large screen device is matched with different screen throwing devices, the corresponding ultrasonic carrier wave frequency bands can be the same or different.

In step S330, the target ultrasonic power or the target ultrasonic amplitude corresponding to the large-screen device is determined according to the area information and the space configuration information of the space where the large-screen device and the screen throwing device are located.

Step S330 is a determination of the target ultrasonic carrier information of the large-screen device in the target space in the amplitude dimension (which may also be described as the power dimension).

According to an embodiment of the present disclosure, in the correspondence relation stored in the mapping table in the above step S320, there is at least one of the following cases a to D.

Case a: under the condition that different first large-screen equipment and second large-screen equipment in the same space carry out the same content screen projection, the first large-screen equipment and the second large-screen equipment have the same target ultrasonic carrier frequency band.

For example, in a conference room, the large screen device 1 and the large screen device 2 are about to perform content screen projection of the screen projection device S, and then both the target ultrasonic carrier frequency bands corresponding to the large screen device 1 and the large screen device 2 may be the same. The same target ultrasonic carrier frequency band can be used for simplified control. It can be understood that in this embodiment, when one screen-throwing device performs screen-throwing of the same content for a plurality of large-screen devices, the target ultrasonic carrier frequency bands of the large-screen devices may also be set to be different.

Case B: under the condition that different first large-screen equipment and second large-screen equipment in the same space independently throw the screen, the first large-screen equipment and the second large-screen equipment have different target ultrasonic carrier wave frequency bands. The content of the screen is not related to the screen content between the first large screen device and the second large screen device, and the screen is controlled independently.

For example, in a conference room, the large screen device 1 is to perform content screen projection of the screen projection device S1, and the large screen device 2 is to perform content screen projection of the screen projection device S2, so that the target ultrasonic carrier frequency bands corresponding to the large screen device 1 and the large screen device 2 are different.

In the case B, by means of a frequency regulation strategy, if one screen throwing device can receive a plurality of ultrasonic carrier signals with equivalent intensity from different large screen devices, the large screen device to be subjected to screen throwing control can be identified based on the difference of the frequency, and the screen throwing code information of the large screen device 1 to be subjected to screen throwing control can be correspondingly analyzed and decoded, corresponding decoding operation is not required to be performed on other irrelevant large screen devices, and interference of the ultrasonic carrier signals of other irrelevant large screen devices in the same space is avoided, for example, if the screen throwing device S1 receives the ultrasonic carrier signals broadcast by the large screen device 1 and the large screen device 2 at the same time, directional identification can be performed through the difference of target ultrasonic carrier frequency bands corresponding to the large screen device 1 and the large screen device 2, and the screen throwing code information of the large screen device 1 to be subjected to screen throwing control can be analyzed and decoded, and a screen throwing data link between the large screen throwing device 1 is established; the ultrasonic carrier signal of the large-screen device 2 is not required to be decoded, the interference of the ultrasonic carrier signal broadcast by the large-screen device 2 is avoided, and the screen-throwing code information of the large-screen device 1 can be successfully identified.

Case C: under the condition that the first space and the second space are different spaces and the third large screen device in the first space and the fourth large screen device in the second space are used for independently projecting screens, the target ultrasonic power or the target ultrasonic amplitude of the third large screen device meets the following conditions: the signal transmission distance in the first space is met, and the signal is attenuated to be below a first preset threshold value after reaching the second space; the target ultrasonic power or the target ultrasonic amplitude of the fourth large-screen device meets the following conditions: the signal transmission distance in the second space is met, and the signal transmission distance is attenuated to be below a second preset threshold value after reaching the first space; the third large-screen device and the fourth large-screen device have the same target ultrasonic carrier frequency band (the target ultrasonic carrier information of the frequency dimension is the same).

In the case C, the intensity of the ultrasonic carrier signals received by the screen projection equipment in different spaces is very weak by setting the regulation strategy of amplitude (or described as power), and the ultrasonic carrier signals can be basically used as noise without being told. Since the target ultrasonic amplitude (or power) of the third large screen device in the first conference room can ensure the signal transmission distance in the first conference room and is attenuated below the first threshold (for example, 2% -5% of the original signal strength) after reaching the second conference room, for the screen throwing device in the second conference room, the received ultrasonic carrier signal (for example, ultrasonic carrier signal H3) of the third large screen device corresponds to a very small target ultrasonic power or amplitude, and compared with the ultrasonic carrier control signal (for example, ultrasonic carrier signal H4) of the fourth large screen device with larger signal strength, the H3 signal can be almost ignored as background noise, and even if the third large screen device and the fourth large screen device have the same target ultrasonic carrier frequency band, by setting the amplitude or power, the interference of the H3 signal on the H4 signal to be actually decoded by the screen throwing device in the second conference room is small. Likewise, the H4 signal has little interference with the H3 signal to be decoded by the first conference room projection device. Thus, effective distinction, directional decoding and directional connection of large-screen devices in different spaces can be performed for the screen throwing device.

Case D: under the condition that a third large screen device in the first space and a fourth large screen device in the second space are used for independently projecting screens, the target ultrasonic power or the target ultrasonic amplitude of the third large screen device meets the following conditions: the signal transmission distance in the first space is met, and the signal is attenuated to be below a third preset threshold value after reaching the second space; the target ultrasonic power or the target ultrasonic amplitude of the fourth large-screen device meets the following conditions: the signal transmission distance in the second space is met, and the signal transmission distance is attenuated to be below a fourth preset threshold value after reaching the first space; the third large-screen device and the fourth large-screen device have different target ultrasonic carrier frequency bands (the target ultrasonic carrier information of the frequency dimension is different); wherein the third preset threshold is greater than the first preset threshold, and the fourth preset threshold is greater than the second preset threshold.

In the case D, by setting the strategy of comprehensively regulating and controlling the amplitude and the frequency, firstly, the screen throwing equipment in different spaces receives the weak intensity of the ultrasonic carrier signals of the large screen equipment in other spaces by setting the strategy of regulating and controlling the amplitude, and meanwhile, in order to further reduce the interference among the ultrasonic carrier signals with different intensities, the same screen throwing equipment can recognize the ultrasonic carrier signals of the large screen equipment with different intensities and correspondingly perform directional decoding on the ultrasonic carrier signals of the target large screen equipment to be subjected to screen throwing control on the basis of the frequency difference if the same screen throwing equipment can receive the ultrasonic carrier signals of the large screen equipment with different intensities by combining the strategy of regulating and controlling the frequency.

In some embodiments, the different target ultrasound carrier frequency bands include one of the following:

different target ultrasonic carrier frequency bands have different pairing identification frequencies; or alternatively

Different target ultrasonic carrier frequency bands have different pairing identification frequencies, and the pairing identification frequencies correspond to unique pairing groups; or alternatively

Different target ultrasonic carrier frequency bands have different pairing identification frequencies, and preset frequency intervals between coding frequencies used for coding the characters in the preset system in the different target ultrasonic carrier frequency bands have differences; or alternatively

Different target ultrasonic carrier frequency bands have different pairing identification frequencies, and the pairing identification frequencies correspond to unique pairing groups; the preset frequency intervals between the coding frequencies used for coding the characters in the preset system in different target ultrasonic carrier frequency bands are different; the pairing group is formed by large-screen equipment and screen throwing equipment.

For example, the target ultrasonic carrier frequency bands corresponding to the large screen devices of different conference rooms have differences; for example, the initial frequency (for example, as a pairing identification frequency) of the target ultrasonic carrier frequency band corresponding to the large-screen device T1 is 20000Hz, and the screen-projection code information after coding (binary, 8-ary, 16-ary, etc.) is transmitted based on coding frequencies 20100Hz, 20200Hz, 20300Hz, etc. with frequency intervals of 100Hz (the values are just examples and can be changed); the initial frequency (for example, as a pairing identification frequency) of the target ultrasonic carrier frequency band corresponding to the large-screen equipment T2 is 20100Hz; the carrier wave band interval adopted is 120Hz, and the coded screen projection code information is transmitted based on coding frequencies 20220Hz, 20340Hz, 20460Hz and the like with frequency intervals of 100Hz (the numerical values are only used as examples; the two are distinguished on the transmission frequency bands, namely, the target ultrasonic carrier frequency bands corresponding to the large-screen devices in different spaces are different.

In step S230, based on the target ultrasonic carrier information, the screen-projecting code information of the large-screen device is encoded to obtain a target ultrasonic carrier signal.

Fig. 4 schematically shows a detailed implementation flowchart of step S230 according to an embodiment of the present disclosure.

Referring to fig. 4, in the step S230, based on the target ultrasonic carrier information, the screen-projecting code information of the large-screen device is encoded to obtain a target ultrasonic carrier signal, which includes the following steps: s410, S420, S430, S440, and S450.

In step S410, determining the pairing identification frequency in the target ultrasonic carrier frequency band as a sequence header; the pairing identification frequency is used as the identification frequency for distinguishing large-screen devices in different spaces.

For example, the pairing identification frequency may be the starting frequency of the target ultrasonic carrier band. It will be appreciated that frequencies at other locations of the target ultrasound carrier frequency band may also be employed as the pairing identification frequency.

In some embodiments, the scenes corresponding to the large screen devices in different spaces corresponding to different pairing identification frequencies include: a plurality of different large screen devices in the same conference room (as an example of space) correspond to different pairing identification frequencies; different pairing identification frequencies correspond to large screen devices in different conference rooms.

In some embodiments, for the same large-screen device, in the case of having one or more corresponding large-screen devices, the paired groups formed by the plurality of large-screen devices and the corresponding large-screen devices have the same paired identification frequency, for example, the paired identification frequencies of the target large-screen device 1 and the two large-screen devices S1 and S2 are respectively: F0. the embodiment can be applied to a scene of the screen contents of a plurality of screen throwing devices displayed by the same large screen device, and when the screen throwing data fed back by the plurality of screen throwing devices are received at one side of the large screen device, the following logic needs to be executed: and distinguishing the screen throwing data returned by different screen throwing devices and carrying out independent synchronous screen throwing display in different areas of the display interface according to respective display logic. The same large screen device does not interfere with each other when a plurality of screen contents are simultaneously and independently displayed.

In some embodiments, the pairing identification frequency corresponds to a unique pairing group, and the pairing group is a pairing group formed by a large-screen device and a screen throwing device; for example, when a plurality of screen throwing devices are connected with the same target large screen device, different pairing groups can be distinguished based on different pairing identification frequencies. For the same large-screen device, under the condition of a plurality of screen-throwing devices, a group of pairing identification frequencies for the large-screen device can be constructed and used for screen-throwing control display corresponding to different screen-throwing devices. For example, the target large screen apparatus 1 and the two control apparatuses S1 and S2 constitute a pairing group: large screen device 1-screen throwing device S1, large screen device 1-screen throwing device S2; the pairing identification frequency corresponding to the pairing group large screen device 1-the screen throwing device S1 is as follows: f1, pairing identification frequency corresponding to the pairing group large-screen equipment 1-screen throwing equipment S2 is as follows: F2. therefore, different pairing groups can be distinguished under the condition that the same target large-screen device and a plurality of screen throwing devices have pairing relation, the uniqueness of pairing group identification is ensured, and particularly when the plurality of screen throwing devices return corresponding screen throwing data, the same large-screen device can distinguish different screen throwing devices and display the corresponding areas in a directional mode based on pairing identification frequency. The embodiment can also be applied to a scene in which the same large screen device displays the screen contents of a plurality of screen devices. The same large screen device does not interfere with each other when a plurality of screen contents are simultaneously and independently displayed.

In some embodiments, where the supported highest transmission frequency is determined to be 22kHz based on shannon's principle, the range of the targeted ultrasonic carrier frequency band may be a frequency band in the range of 20kHz to 22kHz or less, based on a sampling rate of 44K for the audio module.

In step S420, the screen-projection code information is parsed into a character string corresponding to a preset system. The preset system comprises one of the following components: binary, octal, hexadecimal, etc.

In step S430, a sequence body for encoding the character string is generated according to the encoding frequency used for encoding the character of the preset system in the target ultrasonic carrier frequency band; the corresponding coding frequencies of the different characters of the preset system have preset frequency intervals.

In some embodiments, 16 is taken as an example of the preset system, and the pairing group is 3 groups, for example, a large screen device 1-a screen throwing device S1, a large screen device 2-a screen throwing device S2 and a large screen device 3-a screen throwing device S3. In order to ensure that signals transmitted by ultrasonic waves do not interfere with human ears and the interference among coding frequencies is reduced as much as possible, the frequency interval is 100Hz, and particularly, the frequency interval can be selected to be 80-200 Hz through experiments; the specific range may be adjusted. As an example, the starting frequencies (examples of pairing identification frequencies) respectively corresponding to the 3 pairing groups are 20000Hz, 20100Hz, 20200Hz, respectively corresponding to each increment of 100Hz from 20300Hz for a total of 16 frequencies (20300 Hz-21800 Hz) corresponding to the transmission of 16-ary encoded characters 0 to F, that is, 20300Hz for the encoding frequency as character 0 in 16-ary (that is, frequency 20300Hz for character 0 in hexadecimal), 20400Hz for the encoding frequency as 16-ary character 1, and so on, 21800Hz for the encoding frequency as 16-ary character F.

And splicing the coding frequencies in sequence to obtain a sequence body. The screen-shot information (depending on the length of the code length) may be sent one or more times depending on the capacity of the ultrasound transmission (e.g., how long the frequency is transmitted at one time).

In step S440, the sequence header and the sequence body are spliced to obtain a coded frequency sequence.

In step S450, the amplitude of the code frequency sequence is modulated to the target ultrasonic amplitude, or the power of the code frequency sequence is modulated to the target ultrasonic power; the coded frequency sequence obtained after modulation is used as a target ultrasonic carrier signal.

In the embodiment including steps S410 to S450, in the encoding process, the encoding frequency sequence obtained by encoding includes a sequence header and a sequence body, and the sequence body is obtained by performing frequency encoding on the encoding frequency according to the character string corresponding to the screen projection code information; the sequence head is obtained by determining the pairing identification frequency in the target ultrasonic carrier frequency band, the pairing identification frequency is used as the identification frequency for distinguishing the large-screen equipment in different spaces, and the distinguishing of the large-screen equipment in different spaces can be realized by identifying the sequence head, so that the directional control of the different large-screen equipment is realized. In some embodiments, the starting frequency of the target ultrasonic carrier frequency band can be used as a distinguishing mark capable of indicating different large-screen devices, so that the method is convenient and simple to set. It will be appreciated that frequencies at other locations of the target ultrasound carrier frequency band may also be employed as the pairing identification frequency.

In some embodiments, the pairing identification frequency corresponds to a unique pairing group formed by the control device and the controlled device, namely, the pairing identification frequency can simultaneously point to the large-screen device and the corresponding screen throwing device, and the pairing identification frequency also has specific points in the process of executing screen throwing data analysis and decoding operations; the method can realize that the same large screen device does not interfere with each other when a plurality of screen contents are simultaneously and independently displayed.

In step S240, broadcasting the target ultrasonic carrier signal based on the audio module of the large-screen device, so that the target ultrasonic carrier signal is transmitted to a screen throwing device in a space where the large-screen device is located; the screen-throwing code information is used for establishing a screen-throwing data link between the large screen equipment and the screen-throwing equipment.

Referring to fig. 1, the audio module N of the large-screen device 110 broadcasts a target ultrasonic carrier signal, so that the target ultrasonic carrier signal is transmitted to a screen-throwing device in a space where the large-screen device is located, for example, one or more screen-throwing devices 120 in the space. It will be appreciated that the number of large screen devices 110 may also be one or more.

In step S250, based on the established screen-throwing data link, screen-throwing data from the screen-throwing device is received and screen-throwing display is performed.

In some embodiments, one screen-casting device may cast content onto one large screen device or onto multiple large screen devices; or multiple screen-throwing devices can throw respective contents onto one large screen device, and the contents of different screen-throwing devices are presented on the large screen device according to different time sequences, namely, the contents of one screen-throwing device are allowed to be played in the same time period. In some embodiments, the content of a plurality of screen throwing devices is allowed to be presented on the same large screen device in the same period, for example, the content of each screen throwing device can be independently presented according to different areas, and two screen throwing devices a and B establish a screen throwing data link with the large screen device T, so in the large screen device T, a first area is used for presenting the screen throwing content of the screen throwing device a, a second area is used for presenting the screen throwing content of the screen throwing device B, and the first area and the second area are two areas which are mutually independent in pixel space.

In the embodiment including steps S210 to S250, the transmission of the screen-throwing code information is performed between the large screen device and the screen-throwing device based on the ultrasonic wave with the frequency greater than 20kHz, so that the transmission and the reception of the screen-throwing code information can be effectively realized by using the respective audio modules (self-contained hardware devices) of the large screen device and the screen-throwing device, the ultrasonic wave can efficiently transmit signals in a short distance, the transmission of the screen-throwing code information is not required to be performed based on the internet communication mode, and the screen-throwing device can conveniently and rapidly establish a screen-throwing data link between the screen-throwing device and the large screen device based on the screen-throwing code information; through determining the target ultrasonic carrier wave information corresponding to the large screen equipment, under the scene that one or more large screen equipment exists in one space or the large screen equipment in the adjacent multiple spaces is used for broadcasting the screen code information based on ultrasonic waves, corresponding coding processing of the screen code information is carried out based on the target ultrasonic carrier wave information corresponding to each large screen equipment, and a target ultrasonic carrier wave signal is obtained, so that the screen equipment can distinguish the large screen equipment in different spaces after receiving the target ultrasonic carrier wave signal, and corresponding screen throwing data links are established for the target large screen equipment needing to be thrown, directional connection between the screen throwing equipment and the large screen equipment is realized, and mutual interference in the process of simultaneously broadcasting the screen throwing code information based on the ultrasonic waves by the large screen equipment is reduced or even avoided.

Fig. 5 schematically illustrates an interactive process timing diagram of a method of performing a screen throw with a large screen device according to an embodiment of the present disclosure.

According to an embodiment of the present disclosure, the screen projection code information includes: the large screen device is arranged at the network address and the port number of the intranet, the intranet refers to the built local area network, and the traffic data of the network operation service side is not generated.

Referring to fig. 5, the method for projecting a screen applied to a large-screen apparatus includes the following steps in addition to the steps S210 to S250: s501, S502, and S503.

In step S501, a link establishment request initiated by a screen throwing device is received; the link establishment request includes: the target large-screen equipment requiring connection is positioned at a target network address and a target port number of an intranet; the target network address and the target port number are obtained by analyzing the received target ultrasonic carrier signal by the screen throwing equipment.

In step S502, the destination network address and the destination port number are verified.

In step S503, in the case that the verification is passed, a screen-projection data link between the large screen device and the screen-projection device is established.

In some embodiments of the present disclosure, under some architectures, a link establishment request is sent in a directional manner, and a link establishment request for a certain network address and port number is sent in a directional manner to a large-screen device corresponding to the network address and port number, where the large-screen devices of other network addresses and port numbers do not receive the link establishment request; under some architectures, the link establishment request is sent in a non-directional manner, the link establishment request of the screen throwing device can be sent to a plurality of large screen devices in the same space, and each large screen device responds to the link establishment request matched with the network address and the port number of the large screen device by verifying the target network address and the target port number.

Further details of this embodiment, interaction procedures and advantages etc. may be understood by reference to the first embodiment, the third embodiment described later, and will not be described in detail here.

A third exemplary embodiment of the present disclosure provides a method of screen projection applied to a screen projection device.

Referring to fig. 5, the method for projecting a screen, provided in this embodiment, includes the following steps: s510 to S540.

In step S510, based on the audio module of the above-mentioned screen-projection device, at least one target ultrasonic carrier signal to be matched with the broadcast of the large-screen device is received.

In step S520, the target ultrasonic carrier signal is analyzed and decoded, so as to obtain the screen-projection code information of at least one large-screen device to be matched.

According to an embodiment of the present disclosure, in the step S520, the analyzing and decoding process is performed on the target ultrasonic carrier signal to obtain the screen projection code information of at least one large-screen device to be matched, including: analyzing the signal head of the target ultrasonic carrier signal, and determining at least one large-screen device to be matched corresponding to the pairing identification frequency; decoding the signal body of the target ultrasonic carrier signal according to the coding frequency in the target ultrasonic carrier frequency band corresponding to the at least one large-screen device to be matched to obtain screen projection code information of the at least one large-screen device to be matched; wherein, the screen projection code information comprises: the large-screen equipment to be matched is arranged at the network address and the port number of the intranet, and the intranet refers to the built local area network and does not generate flow data of a network operation server.

Because the large screen equipment and the screen throwing equipment have agreed coding and decoding rules, the coding rules of the coding side can be matched when the decoding side decodes the large screen equipment and the screen throwing equipment; in other embodiments, in order to increase the security of signal transmission or avoid being cracked, encryption algorithms or security policies may be added to the encoding rules.

In step S530, a link establishment request is initiated according to the screen-throwing code information of the target large-screen device to be screened, where the link establishment request is used to request to establish a screen-throwing data link between the screen-throwing device and the target large-screen device.

In step S540, based on the established screen-throwing data link, screen-throwing data is sent to the above-mentioned target large-screen device.

Further details, interaction procedures, advantageous effects, etc. of this embodiment may be understood in conjunction with fig. 5 and the contents of the first to third embodiments, and will not be described here again.

A fourth exemplary embodiment of the present disclosure provides a large screen apparatus.

Fig. 6 schematically illustrates a block diagram of a large screen apparatus according to an embodiment of the present disclosure.

Referring to fig. 6, a large screen apparatus 600 provided in an embodiment of the present disclosure includes: an instruction receiving module 601, an ultrasonic carrier information determining module 602, an encoding module 603, a signal transmitting module 604, a data receiving module 605 and a display module 606.

The instruction receiving module 601 is configured to receive a screen-on start instruction.

The ultrasonic carrier information determining module 602 is configured to determine, according to the screen-throwing start instruction, the target ultrasonic carrier information corresponding to the large-screen device.

The encoding module 603 is configured to encode the screen-projection code information of the large-screen device based on the target ultrasonic carrier information, so as to obtain a target ultrasonic carrier signal.

The signal sending module 604 is disposed in the audio module of the large-screen device, and is configured to broadcast the target ultrasonic carrier signal, so that the target ultrasonic carrier signal is transmitted to a screen throwing device in a space where the large-screen device is located; the screen-throwing code information is used for establishing a screen-throwing data link between the large screen equipment and the screen-throwing equipment.

The data receiving module 605 is configured to receive the screen-projection data from the screen-projection device based on the established screen-projection data link.

The display module 606 is configured to perform a screen-projection display based on the screen-projection data.

The large screen apparatus 600 further includes: the device comprises a request receiving module, a verification module and a connection module.

The request receiving module is used for receiving a link establishment request initiated by the screen throwing equipment; the link establishment request includes: the target large-screen equipment requiring connection is positioned at a target network address and a target port number of an intranet; the target network address and the target port number are obtained by analyzing the received target ultrasonic carrier signal by the screen throwing equipment.

The verification module is configured to verify the target network address and the target port number.

And the connection module is used for establishing a screen-throwing data link between the large screen equipment and the screen-throwing equipment under the condition that verification is passed.

For further details and advantages of this embodiment, reference may be made to the descriptions related to the first embodiment and the second embodiment, which are not repeated here.

In a fourth aspect, embodiments of the present disclosure provide a screen projection device.

Referring to fig. 7, a screen projection apparatus 700 provided in an embodiment of the present disclosure includes: a signal receiving module 701, a decoding module 702, a link establishing module 703 and a data transmitting module 704.

The signal receiving module 701 is disposed in the audio module of the screen-throwing device, and is configured to receive a target ultrasonic carrier signal broadcast by at least one large-screen device to be matched.

The decoding module 702 is configured to parse and decode the target ultrasonic carrier signal to obtain screen code information of at least one large-screen device to be matched.

The link establishment module 703 is configured to initiate a link establishment request according to information of a screen-casting code of a target large-screen device to be screen-cast, where the link establishment request is used to request to establish a screen-cast data link between the screen-casting device and the target large-screen device.

The data sending module 704 is configured to send the screen-throwing data to the target large-screen device based on the established screen-throwing data link.

For further details and advantages of this embodiment, reference may be made to the descriptions related to the first and third embodiments, which are not repeated here.

Any of the functional modules included in the large-screen apparatus 600 or the screen projection apparatus 700 may be combined into one module to be implemented, or any of the modules may be split into a plurality of modules. Or at least some of the functionality of one or more of the modules may be combined with, and implemented in, at least some of the functionality of other modules. At least one of the functional modules comprised by the large screen device 600 or the projection device 700 may be implemented at least partly as a hardware circuit, e.g. a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a system on a chip, a system on a substrate, a system on a package, an Application Specific Integrated Circuit (ASIC), or in hardware or firmware in any other reasonable way of integrating or packaging the circuits, or in any one of or in a suitable combination of three of software, hardware and firmware. Or at least one of the functional modules comprised by the large screen device 600 or the projection device 700 may be at least partly implemented as computer program modules which, when executed, perform the respective functions.

It should be noted that, in the technical solution provided by the embodiment of the present disclosure, the related aspects of collecting, updating, analyzing, processing, using, transmitting, storing, etc. of the personal information of the user all conform to the rules of relevant laws and regulations, and are used for legal purposes without violating the public order colloquial. Necessary measures are taken for the personal information of the user, illegal access to the personal information data of the user is prevented, and the personal information security, network security and national security of the user are maintained.

It should be noted that in this document, relational terms such as "first" and "second" and the like are 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. Moreover, 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. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of projection, for use with a large screen device, the method comprising:

Receiving a screen-throwing starting instruction;

determining target ultrasonic carrier wave information corresponding to the large-screen equipment according to the screen-throwing starting instruction;

coding the screen-throwing code information of the large-screen equipment based on the target ultrasonic carrier information to obtain a target ultrasonic carrier signal;

Broadcasting the target ultrasonic carrier signal based on an audio module of the large screen device, so that the target ultrasonic carrier signal is transmitted to a screen throwing device in a space where the large screen device is located; the screen-throwing code information is used for establishing a screen-throwing data link between the large screen equipment and the screen-throwing equipment;

And receiving the screen projection data from the screen projection equipment based on the established screen projection data link and performing screen projection display.

2. The method of claim 1, wherein the target ultrasonic carrier information is used to distinguish large screen devices in different spaces in at least one dimension of amplitude or frequency;

According to the screen-throwing starting instruction, determining the target ultrasonic carrier wave information corresponding to the large-screen equipment comprises the following steps:

determining a target space where the large-screen equipment is located according to the screen-throwing starting instruction;

Determining a target ultrasonic carrier frequency band corresponding to the target space according to a mapping table between the space and the ultrasonic carrier frequency band; the mapping table stores the corresponding relation among the space, the large screen equipment and the ultrasonic carrier frequency band;

And determining the target ultrasonic power or the target ultrasonic amplitude corresponding to the large screen equipment according to the area information and the space construction information of the space where the large screen equipment and the screen throwing equipment are located.

3. The method according to claim 2, wherein the encoding the screen-projection code information of the large-screen device based on the target ultrasonic carrier information to obtain a target ultrasonic carrier signal comprises:

Determining the pairing identification frequency in the target ultrasonic carrier frequency band as a sequence head; the pairing identification frequency is used for distinguishing the identification frequency of large-screen equipment in different spaces;

analyzing the screen-throwing code information into a character string corresponding to a preset system;

generating a sequence body for encoding the character string according to the encoding frequency used for encoding the character of the preset system in the target ultrasonic carrier frequency band; the corresponding coding frequencies among different characters of the preset system have preset frequency intervals;

Splicing the sequence header and the sequence body to obtain a coding frequency sequence;

Modulating the amplitude of the coded frequency sequence to the target ultrasonic amplitude or modulating the power of the coded frequency sequence to the target ultrasonic power; the coded frequency sequence obtained after modulation is used as a target ultrasonic carrier signal.

4. The method according to claim 2, wherein in the correspondence, there is at least one of the following cases:

under the condition that different first large-screen equipment and second large-screen equipment in the same space carry out the same content screen projection, the first large-screen equipment and the second large-screen equipment have the same target ultrasonic carrier frequency band; or alternatively

Under the condition that different first large-screen equipment and second large-screen equipment in the same space are used for independently casting screens, the first large-screen equipment and the second large-screen equipment have different target ultrasonic carrier wave frequency bands; or alternatively

Under the condition that the first space and the second space are different spaces and the third large screen device in the first space and the fourth large screen device in the second space are used for independently projecting screens, the target ultrasonic power or the target ultrasonic amplitude of the third large screen device meets the following conditions: the signal transmission distance in the first space is met, and the signal is attenuated to be below a first preset threshold value after reaching the second space; the target ultrasonic power or the target ultrasonic amplitude of the fourth large screen device meets the following conditions: the signal transmission distance in the second space is met, and the signal transmission distance is attenuated to be below a second preset threshold value after reaching the first space; the third large-screen device and the fourth large-screen device have the same target ultrasonic carrier frequency band; or alternatively

Under the condition that a third large screen device in the first space and a fourth large screen device in the second space are used for independently projecting screens, the target ultrasonic power or the target ultrasonic amplitude of the third large screen device meets the following conditions: the signal transmission distance in the first space is met, and the signal is attenuated to be below a third preset threshold value after reaching the second space; the target ultrasonic power or the target ultrasonic amplitude of the fourth large screen device meets the following conditions: the signal transmission distance in the second space is met, and the signal transmission distance is attenuated to be below a fourth preset threshold value after reaching the first space; the third large-screen device and the fourth large-screen device have different target ultrasonic carrier frequency bands; wherein the third preset threshold is greater than the first preset threshold and the fourth preset threshold is greater than the second preset threshold.

5. The method of claim 2, wherein the different target ultrasound carrier frequency bands include one of:

Different target ultrasonic carrier frequency bands have different pairing identification frequencies, and preset frequency intervals between coding frequencies for coding the characters of the preset system in the different target ultrasonic carrier frequency bands have differences; or alternatively

6. The method of any of claims 1-5, wherein the screen shot information comprises: the large screen device is arranged at a network address and a port number of an intranet, wherein the intranet refers to a built local area network and does not generate flow data of a network operation service side;

the method further comprises the steps of:

Receiving a link establishment request initiated by screen throwing equipment; the link establishment request includes: the target large-screen equipment requiring connection is positioned at a target network address and a target port number of an intranet; the target network address and the target port number are obtained by analyzing the received target ultrasonic carrier signal by the screen throwing equipment;

verifying the target network address and the target port number;

7. A method of screening applied to a screening apparatus, the method comprising:

Receiving at least one target ultrasonic carrier signal broadcast by large-screen equipment to be matched based on an audio module of the screen throwing equipment;

analyzing and decoding the target ultrasonic carrier signal to obtain screen-throwing code information of at least one large-screen device to be matched;

Initiating a link establishment request according to screen-throwing code information of a target large-screen device to be screened, wherein the link establishment request is used for requesting to establish a screen-throwing data link between the screen-throwing device and the target large-screen device;

and sending the screen throwing data to the target large-screen equipment based on the established screen throwing data link.

8. The method of claim 7, wherein the parsing and decoding the target ultrasonic carrier signal to obtain the screen projection code information of the at least one large screen device to be matched comprises:

Analyzing the signal head of the target ultrasonic carrier signal, and determining at least one large-screen device to be matched corresponding to the pairing identification frequency;

Decoding a signal body of the target ultrasonic carrier signal according to the coding frequency in the target ultrasonic carrier frequency band corresponding to the at least one large-screen device to be matched to obtain screen projection code information of the at least one large-screen device to be matched;

Wherein, throw screen code information includes: and the large screen equipment to be matched is arranged at the network address and the port number of the intranet, wherein the intranet refers to the built local area network and does not generate flow data of a network operation server.

9. A large screen apparatus, comprising:

the instruction receiving module is used for receiving a screen throwing starting instruction;

the ultrasonic carrier wave information determining module is used for determining the target ultrasonic carrier wave information corresponding to the large-screen equipment according to the screen throwing starting instruction;

the coding module is used for coding the screen-throwing code information of the large-screen equipment based on the target ultrasonic carrier wave information to obtain a target ultrasonic carrier wave signal;

The signal sending module is arranged in the audio module of the large screen device and is used for broadcasting the target ultrasonic carrier signal so that the target ultrasonic carrier signal is transmitted to the screen throwing device in the space where the large screen device is located; the screen-throwing code information is used for establishing a screen-throwing data link between the large screen equipment and the screen-throwing equipment;

the data receiving module is used for receiving the screen projection data from the screen projection equipment based on the established screen projection data link;

And the display module is used for carrying out screen projection display based on the screen projection data.

10. A screen projection device, comprising:

The signal receiving module is arranged in the audio module of the screen throwing device and is used for receiving at least one target ultrasonic carrier signal broadcasted by the large screen device to be matched;

The decoding module is used for analyzing and decoding the target ultrasonic carrier signal to obtain screen projection code information of at least one large-screen device to be matched;

The system comprises a link establishment module, a screen display module and a screen display module, wherein the link establishment module is used for initiating a link establishment request according to screen display code information of a target large-screen device to be screened, and the link establishment request is used for requesting to establish a screen display data link between the screen display device and the target large-screen device;

And the data transmitting module is used for transmitting the screen throwing data to the target large-screen equipment based on the established screen throwing data link.

11. A screen projection system, comprising: large screen equipment and screen throwing equipment;

The large screen device for performing the method of any one of claims 1-6 or the large screen device of claim 9;

The screen projection device is used for executing the method of claim 7 or 8 or is the screen projection device of claim 10.