KR101729858B1 - Apparatus and method for TV mirroring - Google Patents

Apparatus and method for TV mirroring Download PDF

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Publication number
KR101729858B1
KR101729858B1 KR1020150148542A KR20150148542A KR101729858B1 KR 101729858 B1 KR101729858 B1 KR 101729858B1 KR 1020150148542 A KR1020150148542 A KR 1020150148542A KR 20150148542 A KR20150148542 A KR 20150148542A KR 101729858 B1 KR101729858 B1 KR 101729858B1
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KR
South Korea
Prior art keywords
channel
transmission
channel frequency
broadcast band
idle
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KR1020150148542A
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Korean (ko)
Inventor
신현철
우성철
김승현
손지훈
김성수
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광운대학교 산학협력단
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1454—Digital output to display device ; Cooperation and interconnection of the display device with other functional units involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display

Abstract

Disclosed are an apparatus and a method of TV mirroring. The apparatus for TV mirroring comprises: a broadcast band converter which converts video and sound signals received from a smart device such that the video and sound signals corresponds to a TV standard and modulates the video and sound signals on which a conversion has been performed, thus frequencies of the video and sound signals correspond to a transmission channel frequency set within a TV broadcast band; a beam former which transmits the modulated video and sound signals to a TV based on an optimum beam transmission direction and optimum transmission power; a frequency manager which determines a channel frequency of an idle channel capable of communicating in the TV broadcast band, setting the determined channel frequency to the transmission channel frequency; and a beam forming controller which sets the optimum beam transmission direction and the optimum transmission power using a signal to noise ratio (SNR) of a reception signal regarding a transmission signal of the beam former.

Description

[0001] Apparatus and method for TV mirroring [0002]

The present invention relates to a TV mirroring apparatus and method.

Recently, there is an increasing demand for a mirroring system that allows a screen of a smart device such as a mobile phone or a tablet PC to be viewed on a large screen. However, in order to mirror the screen of the smart device to the video output device, a separate transceiver or a signal converter such as a WiFi connection device is required for the video output device. In order to provide such a separate apparatus, the cost is increased and the complexity of the video output apparatus is increased.

1 is a view schematically illustrating a configuration of a conventional mirroring system.

A method of mirroring a screen of the smart device 10 on a large screen of the TV 20 as shown in FIG. 1 includes the steps of providing a separate wireless transceiver 11 and 21 to the smart device 10 and the TV 20 There is a technology for connecting the smart device 10 and the TV 20 in a communicative manner. For example, the wireless transceiver 11, 21 may be a communication device using Wi-Fi.

However, this technology is disadvantageous in that the TV 20 and the smart device 10 must be connected to the same Wi-Fi network and a separate Wi-Fi router is required. Alternatively, in the case where WiFi Direct which does not require a Wi-Fi router is used, the smart device 10 and the TV 20 both have to support the Wi-Fi direct function. There is a drawback.

As a wireless communication technology other than Wi-Fi, there is also a method of communicating the smart device 10 and the TV 20 using Wireless-USB technology. Wireless-USB is MB-OFDM-based UWB, and has a transmission rate of 480Mbps. This method also has a disadvantage in that it requires a separate wireless transceiver 11, 21 supporting Wireless-USB technology.

In addition, the smart device 10 and the TV 20 may be communicatively connected using WiGig technology based on IEEE 802.11ad. WiGig is a standard for realizing high-speed wireless LAN in the 60GHz band. Although it has a high transmission speed, it has a disadvantage in that it uses a high frequency band and has a physical obstacle such as a wall between two wirelessly connected communication devices There is a disadvantage that the connection can be easily disconnected.

As described above, there is a disadvantage that the conventional communication connection method for mirroring as shown in FIG. 1 requires a separate wireless transceiver 11, 21. However, if the signal is transmitted using the TV broadcast band, as shown in FIG. 2, the TV 20 can be a mirroring screen output device itself without adding additional radio transceivers 11 and 21 .

2 is a diagram illustrating a mirroring system using a TV broadcast band.

As shown in FIG. 2, a TV broadcast band transmitter 15 for transmitting a signal using a TV broadcast band is connected only to the smart device 10, so that a mirroring system can be configured.

For this reason, a mirroring scheme based on compression and modulation suitable for TV standard and TV broadcast bands has also been proposed. However, in general, it is not possible to freely use this mirroring scheme because it is not routinely possible to send signals in the TV band without permission.

On the other hand, in recent years, technology permitting license-exemption for non-locally-used bands among TV broadcast bands has been approved or under review. Thus, if license-free use of the TV idle broadcast band is allowed, a mirroring scheme using the TV broadcast band can be used.

There are some problems in that the mirroring method using the TV broadcast band is actually used. First, since the license-exemption of the TV idle broadcast band has not yet been approved worldwide, there is a problem that the mirroring device using the TV broadcast band can not be used except for a specific region in the world. In particular, in Korea, since the regulation on the use of the TV idle broadcast band is not established by the current regulations, it is impossible to use the mirroring device using the TV broadcast band. Another problem is that in order to operate the mirroring device using the TV broadcast band, an antenna for transmitting and receiving radio waves must be attached to the transmitter and the receiver. Since a normal antenna has isotropic transmission characteristics, transmission and reception are performed in the TV idle broadcast band There is a problem of causing interference to other adjacent video output devices.

In the conventional mirroring systems, there is a limit in that an antenna and a transceiver that are supported by each mirroring device must be provided. In addition, when a wireless connection is made, interference may occur to other adjacent video output devices, There is also a possibility.

The present invention provides a TV mirroring apparatus and method for mirroring video and sound of a smart device to a TV using a TV broadcast band.

According to an aspect of the present invention, a TV mirroring apparatus for mirroring video and sound of a smart device to a TV is disclosed.

The TV mirroring apparatus according to an embodiment of the present invention converts a video and audio signal input from the smart device into a TV standard and then modulates the converted video and audio signals at a transmission channel frequency set in the TV broadcasting band A beamformer for transmitting the modulated image and the sound signal to the TV according to an optimum beam transmission direction and an optimal transmission power, a controller for determining a channel frequency of an idle channel capable of communicating in the TV broadcast band, And a beamforming controller for setting the optimum beam transmission direction and the optimal transmission power using a frequency manager setting the transmission channel frequency and a signal to noise ratio (SNR) of a reception signal for a transmission signal of the beamformer .

And a spectrum sensing unit for sensing a spectrum of the TV broadcast band and searching for TV idle broadcast band information, wherein the frequency manager determines a channel frequency of the idle channel using the TV idle broadcast band information.

And a channel information storage unit for obtaining and storing channel information of the TV broadcast band from a channel database for each region, and the frequency manager determines the channel frequency of the idle channel using the stored channel information.

And a channel selection interface unit for selecting a channel from the user, wherein the frequency manager determines the channel frequency of the channel selected by the user as the channel frequency of the idle channel.

The frequency manager outputs the TV idle broadcast band information or the channel information through the channel selection interface unit to select an idle channel from the user and set the channel frequency of the selected idle channel to the transmission channel frequency.

The beam forming controller sets the beam delivery direction in which the SNR of the reception signal to the transmission signal of the beam former is maximized in the optimum beam delivery direction with the transmission power of the beam former set to the maximum.

The beamforming controller sets the transmission power at which the SNR of the reception signal falls within a predetermined optimum SNR range as the optimal transmission power in a state where the optimum beam transmission direction is set in the beamformer.

Wherein the broadcast band converter comprises: a TV encoder for encoding video and audio signals input from the smart device to a TV standard; a TV modulator for modulating the encoded video and audio signals according to the TV standard; And an RF transmitter for modulating the signal to a transmission channel frequency set in the TV broadcast band.

Wherein the TV encoder comprises an MPEG-2 / AC-3 encoder, an MPEG-2 TS transport encoder and a Reed-Solomon encoder, the TV modulator is an ATSC (Advanced Television System Committee) modulator, An RF modulator and an ATSC duplexer.

The beam former includes an array antenna for transmitting an input signal by radio waves, a power controller for controlling transmission power of the transmitted radio waves, and a phased array beamforming circuit for controlling the beam delivery direction and the beam width of the transmitted radio waves.

According to another aspect of the present invention, a TV mirroring method is disclosed in which a TV mirroring device mirrors video and sound of a smart device to a TV.

A method of TV mirroring according to an exemplary embodiment of the present invention includes receiving video and audio signals from the smart device, converting the input video and audio signals according to a TV standard, Modulating the transformed image and sound signals at the set transmission channel frequency, determining an SNR of a received signal for a transmitted beamformer, Setting an optimum beam transmission direction and an optimal transmission power by using a signal to noise ratio and transmitting the modulated image and sound signal to the TV according to the optimum beam transmission direction and the optimum transmission power do.

The step of setting the determined channel frequency as a transmission channel frequency includes the steps of: detecting a TV idle broadcast band information by sensing a spectrum of the TV broadcast band; and determining a channel frequency of the idle channel using the TV idle broadcast band information .

The step of setting the determined channel frequency as a transmission channel frequency may include obtaining channel information of the TV broadcast band from a channel database for each region and storing the channel information and determining a channel frequency of the idle channel using the stored channel information .

The step of setting the determined channel frequency as a transmission channel frequency includes a step of selecting a channel from a user and a step of determining a channel frequency of the channel selected by the user as a channel frequency of the idle channel.

Wherein the step of setting the determined channel frequency to a transmission channel frequency comprises the steps of: selecting the idle channel from the user by outputting the TV idle broadcast band information or the channel information; and setting the channel frequency of the selected idle channel to the transmission channel frequency .

Wherein the step of setting the optimum beam delivery direction and the optimal transmission power comprises the steps of: setting a transmission power of the beamformer to a maximum; measuring an SNR of a reception signal with respect to a transmission signal of the beamformer by a beam delivery direction of the beamformer And setting a beam delivery direction having a maximum SNR among the beam delivery directions of the beam former to the optimum beam delivery direction.

Wherein the step of setting the optimum beam delivery direction and the optimal transmission power comprises the step of decreasing the transmission power of the beam former from the maximum transmission power step by step while the optimum beam transmission direction is set in the beamformer, And setting transmission power included in a preset optimal SNR range as the optimum beam transmission power when the SNR measurement of the reception signal is completed for each transmission power.

The apparatus and method for TV mirroring according to the embodiment of the present invention can use the TV itself as a video output device for outputting a mirrored screen without adding a separate receiver by mirroring the video and sound of the smart device to the TV using the TV broadcast band have.

1 schematically illustrates a configuration of a conventional mirroring system;
2 is a diagram illustrating a mirroring system using a TV broadcast band;
3 is a view schematically illustrating a configuration of a TV mirroring apparatus according to an embodiment of the present invention.
FIG. 4 schematically illustrates a configuration of the broadcast band converter of FIG. 3; FIG.
Fig. 5 schematically illustrates the configuration of the beam former of Fig. 3; Fig.
6 is a flowchart illustrating a TV mirroring method according to an embodiment of the present invention.
7 is a flowchart illustrating a method of setting an optimum beamformer according to an embodiment of the present invention.
8 is a view showing an application example of a beam-forming antenna according to an embodiment of the present invention.

As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. In this specification, the terms "comprising ", or" comprising "and the like should not be construed as necessarily including the various elements or steps described in the specification, Or may be further comprised of additional components or steps. Also, the terms "part," " module, "and the like described in the specification mean units for processing at least one function or operation, which may be implemented in hardware or software or a combination of hardware and software .

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a view schematically illustrating a configuration of a TV mirroring apparatus according to an embodiment of the present invention. FIG. 4 is a schematic view illustrating the configuration of the broadcast band converter of FIG. 3, Fig. 1 is a schematic view illustrating a configuration of a display device. Hereinafter, a TV mirroring apparatus according to an embodiment of the present invention will be described with reference to FIG. 3, with reference to FIGS. 4 and 5. FIG.

Referring to FIG. 3, the TV mirroring apparatus 100 includes a broadcast band converter 110, a beam former 120, and a mirroring controller 130.

The broadcast band converter 110 encodes and modulates the video and audio signals input from the smart device 10 according to the TV standard, and modulates the modulated video and audio signals into signals of the TV broadcast band. At this time, the broadcast band converter 110 frequency-converts the image and sound signals modulated with the channel frequency of the idle channel set by the frequency manager 131, which will be described later, in the TV broadcast band.

3, the broadcast band converter 110 includes a TV encoder 111 for encoding the video and audio signals input from the smart device 10 according to the TV standard, A TV modulator 112 that modulates to the standard and an RF transmitter 113 that modulates the modulated video and audio signals to the channel frequency of the idle channel set in the TV broadcast band.

4, TV encoder 111 includes an MPEG-2 / AC-3 encoder, an MPEG-2 TS transport encoder, and a Reed-Solomon encoder, An Advanced Television System Committee (ATSC) modulator, and the RF transmitter 113 may include an RF modulator and an ATSC duplexer. That is, the video and audio signals input from the smart device 10 are encoded by the MPEG-2 / AC-3 encoder in accordance with the DTV standards MPEG-2 and AC-3, And can be multiplexed into an MPEG-2 TS packet. In order to increase the mobile reception performance and prevent data loss, the Reed-Solomon type channel coding can be performed by the Reed Solomon encoder in the multiplexed video and audio signals. The encoded image and sound signals are modulated by the ATSC modulator, which is a DTV standard, by the ATSC modulator, and then frequency up-converted by the RF modulator to the channel frequency set in the UHF band. Then, the frequency up-converted image and sound signals with the channel frequency set in the UHF band can be transmitted to the beam former 120 by the ATSC duplexer to be transmitted to the TV 20 through the antenna.

The beam former 120 transmits the video and audio signals modulated at the channel frequency set in the TV broadcast band to the TV 20 in accordance with the beam transmission direction and the transmission power set by the beamforming controller 135 to be described later.

For example, referring to FIG. 5, beamformer 120 may comprise a power controller 121, a phased array beamforming circuit 122, and an array antenna 123. In this case, the power controller 121 can control the transmission power of the outgoing radio waves, and the phased array beamforming circuit 122 can control the transmission power of the outgoing radio waves in the beam delivery direction And the beam width can be controlled. The beamformer 120 according to an embodiment of the present invention is not limited to the structure shown in FIG. 5. Generally, the beamformer 120 may have any structure as long as it can control the transmission power, the beam delivery direction, and the beam width.

The mirroring controller 130 sets the channel frequency of the idle channel that can be communicated using at least one of the TV idle broadcast band information, the stored channel information, and the input channel selection information to the transmission channel frequency of the broadcast band converter 110, The beam delivery direction and the transmission power of the beam former 120 are optimally set.

3, the mirroring controller 130 includes a frequency manager 131, a spectrum sensing unit 132, a channel information storage unit 133, a channel selection interface unit 134, and a beam forming unit 134. [ ) Controller 135. The controller 135 may be any of a variety of types.

The spectrum sensing unit 132 senses the spectrum of the TV broadcast band and searches the TV idle broadcast band information. For example, the spectrum sensing unit 132 may sense the spectrum of the TV broadcast band through the ATSC duplexer of the RF transmitter 113. [

The channel information storage unit 133 acquires and stores channel information of the TV broadcast band from the regional channel database.

The channel selection interface unit 134 is an interface for selecting a channel from a user. For example, the channel selection interface unit 134 outputs the idle channel information of the TV idle broadcast band detected by the spectrum sensing unit 132 or the channel information stored in the channel information storage unit 133, The user can receive the channel selection information of the desired channel.

The frequency manager 131 receives the TV idle broadcast band information retrieved by the spectrum sensing unit 132, the channel information stored in the channel information storage unit 133, or the channel selection information input from the user through the channel selection interface unit 134 The broadcast band converter 110 determines the channel frequency of the communicable idle channel and sets the determined channel frequency to the broadcast band converter 110 (i.e., the RF modulator of the RF transmitter 113) It is possible to modulate the image and sound signals at a channel frequency set in the channel frequency setting unit.

For example, the frequency manager 131 checks the idle channels from the TV idle broadcast band information searched by the spectrum sensing unit 132 or the channel information stored in the channel information storage unit 133, and selects one of the identified idle channels The channel frequency of the selected idle channel can be set in the broadcast band converter 110. [ Alternatively, the frequency manager 131 may output the TV idle broadcast band information retrieved by the spectrum sensing unit 132 or the channel information stored in the channel information storage unit 133 through the channel selection interface unit 134, And the channel frequency of the selected idle channel may be set in the broadcast band converter 110. [

The beamforming controller 135 optimally sets the beam delivery direction and the transmission power of the beam former 120 using the SNR (Signal to Noise Ratio) of the reception signal to the transmission signal of the beam former 120. For example, the beam forming controller 135 may set the beam delivery direction at which the SNR of the received signal to the transmission signal of the beam former 120 becomes the maximum, while setting the transmission power of the beam former 120 to the maximum, The optimal beam transmission direction of the beam former 120 is set and the SNR of the reception signal for the transmission signal of the beam former 120 is set to a predetermined optimum SNR range It is possible to set the transmit power included in the beamformer 120 as the optimum transmit power.

6 is a flowchart illustrating a TV mirroring method according to an embodiment of the present invention.

In step S610, the TV mirroring apparatus 100 receives video and audio signals from the smart device 10. [

In step S620, the TV mirroring apparatus 100 converts the input video and audio signals according to the TV standard. For example, the TV mirroring apparatus 100 may encode the input video and audio signals using MPEG-2, AC-3, MPEG-2 TS, Reed-Solomon, or the like and modulate the video and audio signals using the ATSC method.

In step S630, the TV mirroring apparatus 100 determines a channel frequency of an idle channel that can be communicated using at least one of TV idle broadcast band information, pre-stored channel information, and input channel selection information, and transmits the determined channel frequency to a transmission channel Set it to frequency. For example, the TV mirroring apparatus 100 may identify the idle channels from the TV idle broadcast band information or the stored channel information, which are detected through spectral sensing of the TV broadcast band, and arbitrarily select one idle channel among the identified idle channels , The channel frequency of the selected idle channel can be set to the transmission channel frequency. Alternatively, the TV mirroring apparatus 100 outputs the TV idle broadcast band information or the stored channel information retrieved through the spectrum sensing of the TV broadcast band to select the idle channel from the user, and the channel frequency of the selected idle channel to the transmission channel frequency Can be set.

In step S640, the TV mirroring apparatus 100 frequency-converts the image and sound signals converted in accordance with the TV standard with the channel frequency of the set idle channel.

In step S650, the TV mirroring apparatus 100 optimally sets the beam delivery direction and the transmission power of the beam former 120. [ For example, the TV mirroring apparatus 100 can optimally set the beam delivery direction and the transmission power of the beam former 120 using the SNR (Signal to Noise Ratio) of the reception signal for the transmission signal. This will be described later in detail with reference to FIG.

In step S660, the TV mirroring apparatus 100 determines whether the user's reception status is satisfied. For example, the user can check the reception status of the video and audio signals of the smart device 10 through the TV 20, and input the satisfaction information to the TV mirroring device 100. [

In step S670, the TV mirroring apparatus 100 ends the channel setting when the user satisfies the reception state.

In step S680, the TV mirroring apparatus 100 resets the transmission channel frequency when the user is unsatisfied with the reception state. For example, the TV mirroring apparatus 100 may arbitrarily select another idle channel among the idle channels identified in step S630, and then set the channel frequency of the selected idle channel to the transmission channel frequency.

7 is a flowchart illustrating a method of setting an optimal beamformer according to an embodiment of the present invention. The flowchart of FIG. 7 shows a concrete example of the step 650 of FIG. 6, which is performed by the beam-forming controller 135 of the TV mirroring apparatus 100 shown in FIG.

In step S651, the beamforming controller 135 sets the transmission power of the beam former 120 to the maximum. For example, the beamforming controller 135 may control the power controller 121 of the beam former 120 shown in FIG. 5 to maximize the output power.

In step S652, the beamforming controller 135 measures the SNR of the reception signal for the transmission signal of the beam former 120 for each beam transmission direction of the beamformer 120. [ For example, the beamforming controller 135 may comprise an SNR measurement module (not shown). The beamforming controller 135 sets the beam sending direction to the initial sector in a state in which the beam former 120 transmits a signal with the maximum transmission power, The SNR of the received signal can be measured. Then, the beamforming controller 135 can measure the SNR of the received signal with respect to the transmission signal of the beam former 120 while changing the beam delivery direction to all settable sectors in the same manner.

In step S653, the beamforming controller 135 calculates the beam delivery direction having the maximum SNR among the beam delivery directions of the beam former 120 using the SNR values of the reception signals measured for each beam delivery direction of the beam former 120 And sets the determined beam delivery direction to the optimum beam delivery direction of the beam former 120. [

In step S654, the beamforming controller 135 measures the SNR of the received signal with respect to the transmission signal of the beam former 120 while stepwise decreasing the transmission power of the beam former 120 from the maximum transmission power.

In step S655, when the SNR measurement of the received signal is completed for each transmit power of the beam former 120, the beamforming controller 135 uses the SNR value of the received signal measured for each transmit power to be included in a predetermined optimum SNR range And sets the determined transmission power to the optimum beam transmission power of the beam former 120. [0050] For example, the optimal SNR range may be a range of SNRs that satisfy the minimum quality while enabling communication.

8 is a view illustrating an application example of a beam-forming antenna according to an embodiment of the present invention. In FIG. 8, only the beamforming antenna and the general isotropic antenna are shown separately for the sake of convenience and ease of explanation. This is because the beamformer 120 and the beamformer 120, which are applied to the TV mirroring apparatus 100 shown in FIG. 3, Means that a beam forming controller 135 for controlling the former 120 is installed in at least one of the TV mirroring apparatus 100 and the TV 20. [ That is, the beamforming antenna may be an array antenna 123 included in the beamformer 120, and the beamforming antenna may be applied to the beamformer 120 and the beamforming controller 135.

8 (a) shows a case where a beam forming antenna is applied to both the TV mirroring apparatus 100 and the TV 20, and FIG. 8 (b) shows a case where a beam forming antenna is applied to the TV mirroring apparatus 100, 8 (c) shows a case where an isotropic antenna is applied to the TV mirroring apparatus 100 and a beam-forming antenna is applied to the TV 20, and FIG. 8 .

For example, in the case of FIG. 8A, the beamforming controller 135 of each of the TV mirroring apparatus 100 and the TV 20 sequentially performs the optimal setting method of the beam former 120 described in FIG. 7 We must proceed. 8 (b) and 8 (c), the beamforming controller 135 on the side of the TV mirroring apparatus 100 and the TV 20 on which the beam forming antenna is installed is set to the optimum setting of the beam former 120 Method, and no setting is made for the other isotropic antenna.

On the other hand, the components of the above-described embodiment can be easily grasped from a process viewpoint. That is, each component can be identified as a respective process. Further, the process of the above-described embodiment can be easily grasped from the viewpoint of the components of the apparatus.

In addition, the above-described technical features may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

It will be apparent to those skilled in the art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. Should be regarded as belonging to the following claims.

10: Smart Devices
20: TV
100: TV mirroring device
110: Broadcast band converter
120: beam former
130: Mirroring controller

Claims (18)

A TV mirroring apparatus for mirroring video and sound of a smart device to a TV,
A broadcast band converter for converting the video and audio signals input from the smart device to TV standards and modulating the converted video and audio signals at a transmission channel frequency set in a TV broadcast band;
A beam former for transmitting the modulated image and sound signals to the TV according to an optimum beam transmission direction and an optimum transmission power;
A frequency manager for determining a channel frequency of an idle channel communicable in the TV broadcast band and setting the determined channel frequency to the transmission channel frequency; And
And a beamforming controller for setting the optimum beam transmission direction and the optimal transmission power by using SNR (Signal to Noise Ratio) of a reception signal for a transmission signal of the beamformer,
Wherein the broadcast band converter comprises:
A TV encoder for encoding video and audio signals input from the smart device according to a TV standard;
A TV modulator for modulating the encoded video and audio signals according to the TV standard; And
And an RF transmitter for modulating the modulated video and audio signals at a transmission channel frequency set in the TV broadcast band,
Wherein the TV encoder comprises an MPEG-2 / AC-3 encoder, an MPEG-2 TS transport encoder and a Reed-Solomon encoder, the TV modulator is an ATSC (Advanced Television System Committee) modulator, An RF modulator and an ATSC duplexer.
The method according to claim 1,
And a spectrum sensing unit for sensing the TV idle broadcast band information by sensing the spectrum of the TV broadcast band,
Wherein the frequency manager determines the channel frequency of the idle channel using the TV idle broadcast band information.
3. The method of claim 2,
Further comprising a channel information storage unit for acquiring and storing channel information of the TV broadcast band from a channel database for each region,
Wherein the frequency manager determines the channel frequency of the idle channel using the stored channel information.
The method of claim 3,
Further comprising a channel selection interface unit for selecting a channel from a user,
Wherein the frequency manager determines the channel frequency of the channel selected by the user as the channel frequency of the idle channel.
5. The method of claim 4,
The frequency manager outputs the TV idle broadcast band information or the channel information through the channel selection interface unit to select an idle channel from the user and sets the channel frequency of the selected idle channel to the transmission channel frequency To the TV mirroring device.
The method according to claim 1,
Wherein the beam forming controller sets the beam delivery direction in which the SNR of the reception signal to the transmission signal of the beam former is maximized in the optimum beam delivery direction with the transmission power of the beam former set to a maximum. A TV mirroring device.
The method according to claim 6,
Wherein the beam forming controller sets the transmission power at which the SNR of the reception signal falls within a predetermined optimum SNR range to the optimal transmission power in a state in which the optimum beam delivery direction is set in the beamformer .
delete delete The method according to claim 1,
The beam former comprises:
An array antenna for transmitting an input signal through radio waves;
A power controller for controlling transmission power of the transmission radio wave; And
And a phased array beam forming circuit for controlling a beam sending direction and a beam width of the transmitted radio wave.
A TV mirroring method in which a TV mirroring device mirrors video and sound of a smart device to a TV,
Receiving an image and sound from the smart device;
Converting the input video and audio signals according to a TV standard;
Determining a channel frequency of an idle channel communicable in a TV broadcast band and setting the determined channel frequency to a transmission channel frequency;
Modulating the converted video and audio signals at the set transmission channel frequency;
Setting an optimum beam transmission direction and an optimal transmission power using an SNR (Signal to Noise Ratio) of a reception signal with respect to a transmission signal of a beam former; And
And transmitting the modulated video and audio signals to the TV according to the optimum beam transmission direction and the optimal transmission power,
Wherein the step of converting the input video and audio signals according to a TV standard comprises:
Encoding a video and audio signal input from the smart device to a TV standard by a TV encoder; And
The TV modulator modulating the encoded video and audio signals to the TV standard,
The modulating the converted video and audio signals with the set transmission channel frequency comprises:
Modulating the video and audio signals modulated to the TV standard by the RF transmitter to the set transmission channel frequency,
Wherein the TV encoder comprises an MPEG-2 / AC-3 encoder, an MPEG-2 TS transport encoder and a Reed-Solomon encoder, the TV modulator is an ATSC (Advanced Television System Committee) modulator, An RF modulator, and an ATSC duplexer.
12. The method of claim 11,
Wherein setting the determined channel frequency to a transmission channel frequency comprises:
Sensing a spectrum of the TV broadcast band and searching for TV idle broadcast band information; And
And determining a channel frequency of the idle channel using the TV idle broadcast band information.
13. The method of claim 12,
Wherein setting the determined channel frequency to a transmission channel frequency comprises:
Acquiring and storing channel information of the TV broadcast band from a channel database for each region; And
And determining a channel frequency of the idle channel using the stored channel information.
14. The method of claim 13,
Wherein setting the determined channel frequency to a transmission channel frequency comprises:
Receiving a channel from a user; And
And determining the channel frequency of the channel selected by the user as the channel frequency of the idle channel.
15. The method of claim 14,
Wherein setting the determined channel frequency to a transmission channel frequency comprises:
Outputting the TV idle broadcast band information or the channel information to select an idle channel from the user; And
And setting the channel frequency of the selected idle channel to the transmission channel frequency.
12. The method of claim 11,
Wherein the step of setting the optimum beam delivery direction and the optimal transmission power comprises:
Setting a transmission power of the beam former to a maximum;
Measuring an SNR of a reception signal with respect to a transmission signal of the beam former according to beam delivery directions of the beam former; And
And setting a beam delivery direction having a maximum SNR among the beam delivery directions of the beam former to the optimum beam delivery direction.
17. The method of claim 16,
Wherein the step of setting the optimum beam delivery direction and the optimal transmission power comprises:
Measuring an SNR of the received signal while gradually reducing the transmit power of the beam former from the maximum transmit power in a state where the optimum beam delivery direction is set in the beam former; And
Further comprising setting transmission power included in a preset optimal SNR range to the optimal transmission power when the SNR measurement of the reception signal is completed for each transmission power.
A computer-readable recording medium recording a program for executing the method of any one of claims 11 to 17 in a computer.

KR1020150148542A 2015-10-26 2015-10-26 Apparatus and method for TV mirroring KR101729858B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11088742B2 (en) 2017-12-06 2021-08-10 Samsung Electronics Co., Ltd. Electronic device for performing beamforming in wireless communication system and method therefor
WO2022154194A1 (en) * 2021-01-13 2022-07-21 엘지전자 주식회사 Image display device
WO2023024630A1 (en) * 2021-08-27 2023-03-02 海信视像科技股份有限公司 Display device, terminal device, and content display method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11088742B2 (en) 2017-12-06 2021-08-10 Samsung Electronics Co., Ltd. Electronic device for performing beamforming in wireless communication system and method therefor
WO2022154194A1 (en) * 2021-01-13 2022-07-21 엘지전자 주식회사 Image display device
WO2023024630A1 (en) * 2021-08-27 2023-03-02 海信视像科技股份有限公司 Display device, terminal device, and content display method

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