KR101873317B1 - Wireless broadband adapter for all interface standards - Google Patents

Abstract

The present invention relates to a broadband wireless adapter for transmitting video and audio signals from a smart player to a display device via a high-speed wireless channel, regardless of an interface standard such as MHL or MyDP, And a second broadband wireless adapter connected to the wired connection terminal of the display device.

Description

Background of the Invention [0002] Broadband wireless adapter devices irrespective of interface specifications {Wireless broadband adapter for all interface standards}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadband wireless adapter device irrespective of an interface standard, and more particularly, To a display device via a wireless channel.

A high-definition multimedia interface (HDMI) developed by home appliance companies as an interface that can integrally transmit digital video signals and audio signals to a display device without being compressed by a player such as a computer, a DVD player, and a video game console It is the DP (display port) that PC makers have created against HDMI.

It is a mobile high-definition link (MHL) that is made by the HDMI side, and it is the MyDP (mobility display port) that is made by the DP side as an interface to connect to the DP.

The mobile device is a smart phone in which an operating system is installed, a program can be installed, and voice and data communication can be performed through a communication network. MHL port or MyDP port (hereinafter referred to as "MHL / MyDP") of the smartphone and the HDMI port of the display device are wired in order to view contents such as high-definition video of the smartphone on a large screen or to allow a plurality of people to enjoy watching and enjoying it MHL-to-HDMI cable or MyDP-to-DP / HDMI cable that allows you to view various contents of your smartphone on a large screen by connecting to the Internet.

Hereinafter, a device capable of installing an application under an operating system (OS) and capable of voice or data communication through a communication network is collectively referred to as a smart device.

The wired connection between the smart device and the display device has disadvantages such as installation troubles, restriction of the content utilization, restriction of the user's activity area, etc., which can replace the MHL-to-HDMI cable or the MyDP-to-HDMI cable A wireless communication device and a wireless communication technique are required.

The first problem with the prior art is the cumbersome setting. WiFi or Wireless Gigabit (hereinafter referred to as WiFi) between the transmit and receive channels In order to link the channels, WiFi must be turned on and necessary settings must be made to enable interworking between the transmit and receive channels. It is necessary to install the app on the smartphone at the initial stage of interworking as needed. Such a process is a difficult and cumbersome process for a user to handle the device, stresses the user, and makes the user hesitate to use the device.

The second problem is that it requires a paring time. After setting the smartphone for WiFi channel interworking between sending and receiving, it takes additional tens of seconds until the transceiver is set up to be linked with WiFi channel. Moreover, when the channel setting fails or an automatic reset is executed, it is troublesome to wait for a longer time or to start the resetting again. Each time you use smartphone mirroring, this process puts stress on the user, causing the user to hesitate to use it, which causes the usage rate to drop.

The third is the limitation of wireless connection between devices. All smartphones and tablet PCs have WiFi capabilities, but display devices used as receiving devices may not have WiFi capabilities. In addition, cameras and camcorders that can be used as transmitters often do not have WiFi capabilities. This peripherals environment limits the wireless connectivity between devices and restricts the devices that can be connected.

Fourth, there is a limitation in real-time application due to signal delay. Due to the limitation of the transmission speed due to the limitation of the capacity of the WiFi channel, it is necessary to compress and transmit a high quality image to be wirelessly transmitted. The WiGig channel, which can transmit several gigabits per second, is a process of packetizing audio video signals through a packetizer on a frame-by-frame basis and then connecting them to WiFi or WiGig protocol stacks for uploading to the protocol stack, whether WiFi channel or WiGig channel, It goes through. This process is also reversed in the receiver to obtain the final required video and audio signals. This series of transmission and reception procedures leads to a delay in signal transmission and makes real-time processing difficult. Applications that require real-time processing, such as video transmission based on games or automotive safety, experience inconvenience.

In addition, it has different frame formats according to each of the wired video transmission standards (HDMI / MHL / DP / MyDP), so that packet transmission of different standard video signals in different frames for transmission to one wireless system and transmission Complex high-speed systems are required.

The fifth is power consumption of smart phones. The modulation method with a high order index used in WiFi requires a large SNR, and in particular, the OFDM modulation method requires a relatively large power signal transmission in order to secure linearity, thereby consuming a large amount of power. This is an inconvenience to the user because it is a factor limiting the long-time use such as a movie in a battery-operated smart phone.

As a conventional technique, Patent Document 1 discloses a technology for synchronizing synchronizing for wireless transmission of data while a multimedia source device transmits data to a multimedia sink device while wirelessly connecting and transmitting data Respectively.

The technique disclosed in Patent Document 1 compresses or packetizes a signal to be transmitted as a basic premise and transmits data according to a transmission protocol. When a WiFi channel is used, a data packet is transmitted on a protocol adaptation layer. In case of using Wi-Fi channel, compression process is performed before data is packetized due to the limit of transmission band.

At the time of transmission, the compressed and packetized information reaches the receiving device and must be restored to the information before compression and packetization. Therefore, a time delay due to compression and packetization inevitably occurs in the data communication process, and there is a limitation in applications requiring real-time processing such as image transmission for game or automobile safety. In addition, complicated signal processing is a limiting factor for long-time use of battery-powered smart devices.

Considering the peripheral environment, using only a Wi-Fi channel in a wireless connection for transmitting and receiving a large amount of information between devices has a limitation in using various multimedia source devices. Further, in order to transmit video or audio signals, which are large-capacity information, in real-time without loss of information, it is necessary to use a broadband high-speed wireless channel having a transmission rate of gigabit unit.

Accordingly, there is a need to develop an interface and a related high-speed transmission technology capable of transmitting large-capacity information such as an image or voice signal to a multimedia sink device such as a display device by connecting to output ports of various multimedia source devices.

1. U.S. Published Patent Application 2013-0195233 (published August 1, 2013)

The present invention, which is devised in accordance with the above-mentioned necessity, is characterized in that when a video signal and a voice signal are transmitted from a smart player to a display device, high-quality data of a large amount of data is uncompressed, regardless of an interface standard such as MHL or MyDP, And to provide an interface device for transmitting to a display device.

According to another aspect of the present invention, there is provided an interface device for wirelessly transmitting data signals from a smart device to a display device through a single channel, A clock signal separator for separating and removing the clock signal, a multiplexer for multiplexing the control data including the video data and the clock information, and a first wireless communication unit for wirelessly transmitting the data multiplexed in the single channel, The data signal is wirelessly transmitted in a single channel in an uncompressed manner irrespective of the interface standard of the interface.

As another embodiment of the broadband wireless adapter according to the present invention, in an interface device for wirelessly transmitting two channels from a smart device to a display device, the common mode clock signal of the MHL is separated and removed from the wired connection terminal of the smart device A clock signal separator for generating control data including clock information; A first high-speed wireless communication unit for wirelessly transmitting video data and a first low-speed wireless communication unit for wirelessly transmitting control data, wherein the video and control data signals are separated into two channels And wireless transmission.

And the wired connection terminal of the smart device is an MHL port or a MyDP port.

And the HDMI-to-MHL / MyDP converter is further used when the wired connection terminal of the smart device is an HDMI port.

When the wired connection terminal of the smart device is a DP port, the DP data is defined as 1-lane of MyDP.

As another embodiment of the present invention, an interface device for wirelessly receiving a data signal transmitted from a smart device to a display device through two channels includes: a second high-speed wireless communication unit wirelessly receiving image data; A second low-speed wireless communication unit for wirelessly receiving control data including clock information; A clock data recovery unit for recovering the clock and data of the video data received by the second high-speed wireless communication unit using the clock information received by the second low-speed wireless communication unit; and a clock data recovery unit for recovering the clock signal and the video data, And a clock signal mixing unit for mixing the video signal and the control data signal, the video signal and the control data signal being transmitted through the two wireless channels, regardless of the interface standard of the smart device.

As another embodiment of the present invention, a broadband wireless adapter device for wirelessly transmitting two channels and a broadband wireless adapter device for wirelessly receiving two channels are combined.

The broadband wireless adapter device according to the present invention supports high-speed wireless communication regardless of the interface standard between a smart device such as a smart phone, a smart pad, a tablet, a digital camera, and a notebook and a display device, Allows viewing on a larger screen display without compromising image quality.

Also, since the high-speed wireless channel connection using the millimeter wave frequency such as the 60 GHz band, the connection between the smart device and the display device is simplified, and the restriction on the distance and position between the devices is free.

In addition, the broadband wireless adapter device does not require cumbersome settings for wireless transmission and reception, and can be installed and used simply. It does not need to spend a couple of seconds of pairing time, It can be used for driving cars.

In addition, the battery operating time can be increased due to the low power operation.

1 is a conceptual diagram of a broadband wireless adapter device according to the present invention.
FIG. 2 shows an embodiment of transmitting control data including image data and clock information according to the present invention over one high-speed wireless channel.
FIG. 3 illustrates an embodiment in which video data according to the present invention is transmitted on a high-speed wireless channel and control data including clock information is transmitted using a low-rate wireless channel.
FIG. 4 illustrates an embodiment of receiving data wirelessly transmitted on a single channel according to the present invention.
FIG. 5 shows an embodiment of two-channel reception using a low-rate wireless channel in which control data including clock information is received by the image data according to the present invention on a high-speed wireless channel.
FIG. 6 shows another embodiment of the present invention in which the HDMI-to-MHL / MyDP converter is added to the first broadband wireless adapter before the output port of the smart device is HDMI.
7 is an application example in the case where the output port of the smart device is DP, according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings illustrate only the essential features for the sake of clarity of the invention and are not to be construed as limiting the drawings.

In the present invention, expressions such as the first and second expressions are used for expressing elements differently and do not have numerical or special meanings.

FIG. 1 is a conceptual diagram of a broadband wireless adapter according to the present invention. In order to wirelessly transmit a data signal from a smart device to a display device, a first broadband wireless adapter connected to a wired connection terminal of a smart device, And a second broadband wireless adapter connected to the second broadband wireless adapter.

Wherein the wired connection terminal of the smart device is a mobile high-definition link (MHL) port or a mobility display port (MyDP) port and the wired connection terminal of the display device is a high-definition multimedia interface (HDMI) .

The first and second broadband wireless adapters may be in the form of a dongle utilizing a gigabit high-speed wireless transmission technique using a sub-terahertz wave having a frequency band of 30 to 300 GHz or a millimeter wave of 100 GHz to 1 THz And a module type in which an RF module is integrated.

The interface developed by AV appliance companies as the main axis is HDMI, and the interface developed by PC-related companies against HDMI due to the problem of royalties and so on is related to the interface between smart mobile devices and HDMI. And the interface between the smart mobile device and the DP in the DP side is MyDP, compatibility becomes a problem.

According to the present invention, a broadband wireless adapter is provided irrespective of the interface cable to be provided according to the interface standard, thereby enabling connection to any interface standard such as MyDP-to-HDMI or MHL-to-HDMI.

FIG. 2 shows an embodiment of transmitting control data including video and audio data (hereinafter, referred to as 'video data') and clock information according to the present invention over one high-speed wireless channel.

The control data including the clock information of the present invention is provided for clock recovery of the receiving side as the clock frequency of the transmitting side and may include various information capable of controlling the display device in the smart device. The clock frequency of the transmitting side can be obtained by using a frequency counter or the like.

The present invention relates to a conventional wired protocol and a data frame, which is used by a manufacturer as it is, and transmits only a wireless part regardless of a protocol. In order to know a clock frequency, This is a technology that is simple enough to transmit regardless of this, and can transmit all video signals.

 The first broadband wireless adapter on the MHL / MyDP port side may include a clock signal separation unit, a high-speed multiplexer, a first wireless communication unit, and a control unit.

The clock signal separator removes a common mode clock from the wired connection terminal (MHL / MyDP port) of the smart device. In order to transfer the MHL + / MHL video signal to the radio, the common mode clock signal of the MHL port must be removed and removed. The common mode clock signal is removed by connecting two resistors between the MHL + / MHL signal lines with mixed common mode clock signals, and grounding the MHL + / MHL signal lines, respectively, and extracting the output between the two resistors.

On the other hand, since there is no common mode clock signal in the MyDP (p) / MyDP (n) video signal line, the signal before passing through the clock signal separator is the same as the signal after passing through the clock signal separator.

The high-speed multiplexer mixes and multiplexes the control data including the video data and the clock information for transmission on a single wireless channel. The multiplexing method can be multiplexed by time division (TDM) or frequency division (FDM).

The first wireless communication unit wirelessly transmits data multiplexed on a single channel through an antenna. The first wireless communication unit is composed of a transmitter / a receiver and a switch, and wirelessly transmits / receives control data including video data and clock information.

In the case of transmitting the image data of the smart mobile device by the selection signal Sel1 of the control unit through the high speed multiplexer, the transmitter is enabled. When receiving the control data including the clock information from the display device, And inputs control data including information to CBUS (C-wire) of the MHL / MyDP port.

As such, since the present invention does not use a wireless transmission protocol, there is no need to packetize data, and there is an advantage that a data signal can be wirelessly transmitted in a non-compressed manner irrespective of an interface standard of a smart device.

FIG. 3 shows an embodiment of two-channel transmission in which the image data according to the present invention is transmitted on a high-speed wireless channel and the control data including clock information is transmitted using a low-rate wireless channel.

 The clock signal demultiplexer separates and removes a common mode clock of the MHL, such as a single channel transmission, and generates control data including clock information obtained from a frequency counter or the like.

The first high-speed wireless communication unit only transmits the video data to the transmitter.

The first low-speed wireless communication unit is composed of a transmitter, a receiver, and a switch, and transmits / receives control data of the CBUS. The first low-speed communication unit may be Bluetooth, Zigbee, WiFi, IrDA, or the like.

2-channel wireless transmission has a disadvantage of having a low-speed channel in addition to a high-speed channel, but it has an advantage that a clock data recovery circuit (CDR) of a receiver can be implemented more easily than a single-channel high-speed wireless transmission. In high-speed wireless transmission, the CDR needs to operate at high speed, which consumes a lot of power. If a low-speed channel is additionally used, the clock frequency information can be separately received. Therefore, it can be implemented more simply than a heavy CDR for estimating and calculating a conventional clock, thereby reducing power consumption and realizing low-cost implementation.

Although the smart device transmits image data in one direction to the display device, the control data must be transmitted in both directions between the smart device and the display device.

In order to accommodate VGA, HD, FHD, 4k, and 8k video data, a broadband CDR including VCO and PLL operating at 400 MHz to 18 GHz must be implemented to accommodate each data transmission rate.

Implementation of a broadband CDR requires multiple VCOs and / or complex resonator banks, and requires a suitable bank selection method to operate correctly. Such a broadband CDR is high in complexity and has a large chip area and high power consumption. However, if it is possible to know the clock information (especially the clock frequency of the MHL) of the video signal at the time of transmission or acquire the resolution of the image and add the information to the low-speed wireless channel, the broadband CDR is simple It is possible to implement a low power small model receiver.

The present invention is advantageous in that the CDR can be implemented simply because the clock frequency of the transmitter is acquired and the control data including the clock information is transmitted in the low-rate radio channel to generate the clock in the CDR.

FIG. 4 illustrates an embodiment of receiving data wirelessly transmitted on a single channel according to the present invention. The second broadband wireless adapter on the side of the HDMI / DP port includes a second wireless communication unit, a clock data recovery unit (CDR), a high-speed demultiplexer, a clock signal mixing unit, and a control unit .

The second wireless communication unit wirelessly receives multiplexed data through a single channel through an antenna. The second wireless communication unit is composed of a transmitter / receiver and a switch. The video data is received by the receiver, and the control data including the clock information transmitted from the display device is transmitted to the first broadband wireless adapter through the transmitter.

The clock data restoration unit restores the clock and data using the clock information of the signal received by the second wireless communication unit.

The demultiplexer separates the video data and the control data. The separated image data is transmitted to the clock signal mixing unit, and the control data is connected to the CBUS and used as a control signal.

The clock signal mixing unit mixes the separated image data with a clock signal and transmits the mixed signal to the HDMI port. In the case of the MyDP signal, since there is no common mode clock signal in the video signal, it is directly transmitted to the HDMI port without passing through the clock signal mixing portion.

FIG. 5 shows an embodiment of two-channel reception of receiving image data according to the present invention on a high-speed wireless channel and using low-speed wireless channel for control data.

The second high-speed wireless communication unit performs only a function of receiving video data by a receiver.

The second low-speed wireless communication unit is composed of a transmitter, a receiver, and a switch, receives control data including clock information, and transmits / receives control data of the CBUS. The received clock information is transferred from the controller (micom) to the CDR to recover the clock.

The CDR has a plurality of resonator banks and a VCO, and by selecting a suitable resonator bank and VCO corresponding to the clock frequency according to the clock information, the clock is restored, so that the stabilization time can be shortened and the operation can be accurately performed.

The clock data restoration unit restores the clock and data of the signal received from the second high-speed wireless communication unit, such as a single channel receiver.

The clock signal mixing unit mixes the image data reconstructed by the clock data reconstruction unit with a clock signal. In the case of the MyDP signal, since there is no common mode clock signal in the video signal, it is directly transmitted to the HDMI port without passing through the clock signal mixing portion.

There may be cases where the output port of the smart device is HDMI or DP instead of MHL / MyDP port.

FIG. 6 shows another embodiment of the present invention in which the HDMI-to-MHL / MyDP converter is added to the first broadband wireless adapter before the output port of the smart device is HDMI. Or a bridge cable having an HDMI-to-MHL / MyDP converter function is used separately, the first broadband wireless adapter and the second broadband adapter can be used as they are.

FIG. 7 illustrates another embodiment of the present invention. When the output port of the smart device is DP, the DP data is defined as MyDP 1-lane, and the first broadband wireless adapter and the second broadband adapter can be used as they are.

Claims (6)

1. A broadband wireless adapter device for wirelessly transmitting from a smart device to a display device via two channels,
A clock signal separation unit for separating and removing the common mode clock signal of the MHL from the wired connection terminal of the smart device and generating control data including clock information of the MHL for clock recovery on the reception side;
A first high-speed wireless communication unit wirelessly transmitting image data;
And a first low-speed wireless communication unit wirelessly transmitting the control data,
Wherein the wireless communication device is connected to a wired connection terminal of the smart device and separates video and control data signals in an uncompressed manner regardless of an interface standard of the smart device and wirelessly transmits the video and control data signals through two channels. The method according to claim 1,
Wherein the wired connection terminal of the smart device is an MHL port or a MyDP port. The method according to claim 1,
Wherein the wired connection terminal of the smart device is an HDMI port, and further uses an HDMI-to-MHL / MyDP converter. The method according to claim 1,
Wherein when the wired connection terminal of the smart device is a DP port, the DP data is defined as 1-lane of MyDP. 1. A broadband wireless adapter device for wirelessly receiving a data signal sent from a smart device to a display device via two channels,
A second high-speed wireless communication unit for separating the common mode clock signal of the MHL and wirelessly receiving the removed video data;
A second low-speed wireless communication unit for wirelessly receiving control data including clock information of the MHL;
A clock data restoring unit for restoring the clock and data of the image data received by the second high-speed wireless communication unit using the clock information of the MHL received by the second low-speed wireless communication unit,
And a clock signal mixing unit for mixing the clock signal reconstructed by the clock data reconstruction unit with the image data,
The clock data restoration unit may restore the clock and data of the image data by selecting the resonator bank and the VCO corresponding to the clock frequency according to the clock information of the MHL,
Wherein the video and control data signals, which are connected to a wired connection terminal of the display device and are transmitted in an uncompressed manner regardless of an interface standard of the smart device, are separately received through two wireless channels. The broadband wireless adapter device according to claim 1, wherein the broadband wireless adapter device wirelessly transmits data on two channels of claim 1 and the broadband wireless adapter device wirelessly receives data on two channels.

Images