KR101461855B1 - System for optical distribution of digital signal - Google Patents

Abstract

Disclosed is a system performing the optical distribution of a digital signal among a broadcasting signal, a DVI signal, and an HDMI signal using an optical cable. The system includes: a first transceiver (100), a second transceiver (200), and an optical cable (300) bidirectionally transmitting an original digital signal from the first transceiver to the second transceiver, or from the second transceiver to the first transceiver. When the original digital signal is transmitted from the first transceiver to the second transceiver, the first transceiver receives and encodes the original digital signal to serialize the signal into an electric signal, and the second transceiver receives, deserializes, and decodes the serialized signal from the first transceiver through the optical cable to restore the signal into the original digital signal. When the original digital signal is transmitted from the second transceiver to the first transceiver, the second transceiver receives and encodes the original digital signal to serialize the signal into an electric signal, and the first transceiver receives, deserializes, and decodes the serialized signal from the first transceiver through the optical cable to restore the signal into the original digital signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system for distributing digital signals,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical dispersion or optical transmission system for digital signals and more specifically to a system for serializing a broadcast signal, an HDMI signal or a DVI signal into an electrical signal, Demodulates, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes, demultiplexes,

Generally, in a data transmission system, a plurality of devices are organically connected to each other to exchange data with each other to form a single entity. Therefore, even if the individual performance of each device is improved, it is difficult to perform the inherent performance of the device unless a smooth data transfer is performed at the interface between the devices, that is, at the interface. In particular, when data is converted into a mutually recognizable signal structure in order to link two or more devices having different operating principles, the quality of the data often deteriorates.

One of the important interfaces, Digital Visual Interface (DVI), was developed by the Digital Display Working Group (DDWG), a group of companies including Intel, Silicon Image, HP, Compaq and NEC. It was first released, and since about 2005, most LCE monitors and graphics cards have begun to run out of DVI ports.

As an interface to be compared with DVI, there is "HDMI (High Definition Multimedia Interface) ". DVI is mainly used in computers, but HDMI is mainly used in A / V devices such as TVs and Blu-ray players. Unlike DVI, which can only transmit video signals, HDMI is different in that voice signals can be transmitted simultaneously through a single cable. However, since the same type of digital image data is used internally, DVI-HDMI conversion gender or cable can be used to output video images.

The digital signal transmitted to the HDMI interface is basically a combination of the DVI video signal and the S / PDIF audio signal. Therefore, if a gender or a conversion cable for converting the terminal type is used, it is possible to connect the HDMI type reproducer and the DVI type output device or vice versa. In addition to the video signal and the sound signal, the HDMI transmits internally an encryption signal for copyright protection called HDCP (High-bandwidth Digital Content Protection).

1 shows an example of a basic DVI format digital video transmission system. Referring to FIG. 1, the digital video transmission system includes a host device 11, a display device 12, and a cable. Here, the cable is connected between the input / output terminals TH1 to TH14 of the host apparatus 11 and the input / output terminals TD1 to TD14 of the display apparatus 12. [ The host apparatus 11 includes a TMDS transmission unit 111 and a graphic control unit 112. [ The display device 12 includes a serial EEPROM 122 and a TMDS receiver 121. The TMDS transmitter 111 in the host device 11 converts the clock signal SCS and the digital image data SVID into TMDS signals according to the DVI format and outputs them to the display device 12. A serial EEPROM (122) in the display unit 12, extended display identification data of the display device (12): storing (EDID Extended Display Identification Data) and, I ² C (Inter-Integrated Circuit) Host according to a communication protocol And provides extended display identification data (EDID) to the graphics controller 112 in the device 11. [ The graphic controller 112 in the host device 11 controls the operation of the TMDS transmitter 111 according to the extended display identification data. The TMDS receiver 121 in the display device 12 restores the DVI format TMDS signals from the host device 11 into the clock signal SCS and the digital video data SVID. The basic structure of a digital video transmission system of HDMI format has a similar structure.

In such a conventional digital image transmission system, the maximum distance between the host device and the display device is limited to about 10 meters. If the distance between the host device and the display device is long, a transmission / reception reinforcement device such as an optical cable module or a repeater is required. Such a transmission / reception enhancing apparatus is provided with a transmitter and a receiver. The transmitting unit is coupled to the host device, the receiving unit is coupled to the display device, and the communication line is connected between the transmitting unit and the receiving unit. In the above-described transmission and reception apparatus, transmission and reception lines of a plurality of channels, that is, optical fiber lines (optical cables) or electric lines, must be connected between a transmitter and a receiver. Therefore, in the digital image transmission system equipped with the transmission / reception reinforcement device, it is not easy to install and manage, and the manufacturing cost is high.

In order to solve such a problem, Korean Patent Registration No. 10-0911245 (Registered Jul. 31, 2009) discloses a digital image transmission system for transmitting extended display identification data (EDID) between a transmitter and a receiver of a transmission / And the number of transmission / reception lines in the transmission / reception reinforcement device is greatly reduced, so that it is easy to manage and install and the manufacturing cost can be reduced.

However, the prior art has a transmitting side bi-directional multiplexer / demultiplexer (TBMD) and a transmitting side radio transceiver (TWT) to transmit the EDID, and correspondingly a receiving side bi-directional multiplexer / demultiplexer (RBMD) (RWT), so that the number of transmission / reception lines can be greatly reduced. However, since the system is complicated and difficult to implement, it is also possible to expand the transmission / It is difficult to see.

Accordingly, there is a need in the art to provide a communication port between a transmitter and a receiver via an optical cable, and to more effectively increase the scalability in distributing and transmitting digital signals such as a broadcast signal, a DVI signal, or an HDMI signal Is required.

Prior Art 1: Korean Patent Registration No. 10-0911245 (registered on July 31, 2009) Prior Art 2: Korean Patent Registration No. 10-0993484 (published Nov. 4, 2010)

Accordingly, an object of the present invention is to provide a communication port between transceivers through an optical cable, and in order to effectively enhance the scalability in distributing and transmitting a digital signal such as a broadcast signal, a DVI signal, or an HDMI signal, To transmit a digital signal between the transceivers in both directions through the optical transmission line.

According to an aspect of the present invention, an optical dispersion or optical transmission system for digital signals is a system for optical distribution or optical transmission of a digital signal using an optical cable, A first transceiver that receives and encodes an original digital signal and serializes it into an electrical signal; an optical cable that transmits a serialized signal from the first transceiver; And a second transceiver for receiving a signal of the first digital signal through the optical cable, deserializing and decoding the original digital signal, and transmitting the original digital signal to the terminal.

According to an exemplary embodiment, the original digital signal may be any one of a broadcast signal, a DVI signal, and an HDMI signal.

According to one embodiment, the first transceiver comprises a receiver for receiving the original digital signal, an encoder for encoding the original digital signal from the receiver, a serializer for serializing the encoded signal in the encoder into an electrical signal, The second transceiver includes a deserializer serialized from the serializer and deserializing a signal transmitted through the optical cable, a decoder for decoding the deserialized signal and restoring the deserialized signal into a raw digital signal, and a transmitter for transmitting the restored original digital signal to the terminal.

According to one embodiment, the first transceiver further comprises a distributor 140 for distributing the serialized signal by the first transceiver to a plurality of ports.

According to one embodiment, in the first transceiver, the encoder and the serializer may be implemented as Field Programmable Gate Array (FPGA), and the deserializer and the decoder may also be implemented in the FPGA in the second transceiver.

According to one embodiment, the optical dispersion or optical transmission system of the digital signal further includes an up-scaler which is located between the second transceiver and the terminal, raises the resolution of the original digital signal and sends it to the terminal side can do.

According to another aspect of the present invention, there is provided an optical dispersion or optical transmission system for a digital signal, which is configured to transmit an original digital signal of a broadcast signal, a DVI signal, and an HDMI signal to an optical A system for optical distribution or optical transmission comprising a first transceiver, a second transceiver, and a second transceiver connected to the first transceiver and the second transceiver, Wherein the first transceiver transmits the original digital signal from the first transceiver to the second transceiver side when the first transceiver transmits the original digital signal from the first transceiver to the second transceiver side, And encodes the received signal to serialize it into an electrical signal, and the second transceiver When receiving the serialized signal from the first transceiver through the optical cable, deserializes and decodes the serialized signal to recover the original digital signal, and when transmitting the original digital signal from the second transceiver to the first transceiver side, The first transceiver receives the serial signal from the second transceiver through the optical cable, deserializes and decodes the original signal, and restores the original signal into a digital signal. The second transceiver receives the original digital signal and encodes the original digital signal to serialize it as an electrical signal. do.

According to one embodiment, each of the first transceiver and the second transceiver includes a receiver for receiving the original digital signal, which is used for transmission in either direction of bi-directional transmission, and a receiver for receiving the original digital signal from the receiver A serializer for serializing an encoded signal in the encoder into an electrical signal; and a distributor for distributing the serialized signal to a plurality of ports in the serializer, A deserializer for deserializing a signal transmitted from the serializer through the optical cable and used for transmission in one direction, a decoder for decoding the deserialized signal and restoring the deserialized signal into a raw digital signal, And a transmitter for transmitting the recovered original digital signal.

According to one embodiment, the encoders and serializers in each of the first transceiver and the second transceiver are implemented in FPGA (field programmable gate array), and deserializer and decoder in FPGA.

The present invention provides an optical dispersion or optical transmission system of a digital signal capable of bidirectionally transmitting a digital signal between transceivers through an optical cable, thereby making it possible to expand a digital signal such as a broadcast signal, a DVI signal or an HDMI signal, .

1 is a diagram showing an example of a basic DVI format digital image transmission system.
2 is a block diagram of an optical dispersion or optical transmission system of a digital signal according to an embodiment of the present invention.
FIG. 3A is a detailed block diagram of digital signal processing components of the transceivers 100, 200 through the optical cable 300 in FIG.
FIG. 3B is a detailed block diagram of the digital signal processing components of the transceivers 100 and 200 through the optical cable 300 in FIG. 2, which distributes the serialized signal from one port to a plurality of ports 310 Lt; RTI ID = 0.0 > 140 < / RTI >
4 is a block diagram illustrating a specific example of bidirectional transmission through optical cable 300 in an optical dispersion or optical transmission system of a digital signal according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings and the associated description are provided to assist those of ordinary skill in the art in aiding the understanding of the invention and are therefore to be construed as illustrative and not restrictive, It will not be interpreted.

First, terms used in this specification will be described.

The serializer performs the function of converting the parallel signal into the serial signal, and the deserializer performs the reverse function. In a terminal such as a PC, data is usually processed in parallel. In order to transmit data in a transmission path, it is necessary to transmit data in one line. Therefore, it is necessary to change parallel data transmitted in a plurality of lines in series. A serializer and a deserializer are used. For example, when data is transmitted over an optical cable, data is serialized and transmitted. In the form of SerDes, which can perform both functions (ie, Serialize and Deserialize) . For example, in order to process a large amount of data, most of the operations inside the semiconductor chip are processed to 32 bits or 16 bits. When sending the processed signal to another chip, the data width is serialized to 1 bit and the receiving side restores the signal of 1 bit width to 32 bits or 16 bits again. SerDes performs this function. As data processing speeds up, the amount of signal transmission is also increasing. There are two ways to increase the amount of data transmission: increase signal line or increase signal transmission speed. If signal line is increased, power consumption is increased and possibility of data transmission failure is increased, so it is difficult to increase signal transmission amount. . Therefore, it is SerDes that appeared as a way to quickly take one signal line itself instead of increasing the signal line. To implement SerDes, from the logic point of view, a Parallel In Serial Out (PISO) block and a Serial In Parallel Out (SIPO) block are needed inside the chip. From the SI (Serial In) / PI (Parallel In) viewpoint, it is necessary to separate the power between the noise sensitive SerDes block and the other logic blocks. In addition, to improve SI, the chip has a termination (On Die Termination (ODT) or On Chip Termination (OCT)). Unlike GPIO, it is designed in uni-direction to maximize SI performance.

DVI (Digital Visual Interface) is a standard image interface optimized for the image quality of digital display devices such as flat panel liquid crystal display computer displays and digital projectors.

HDMI (High Definition Multimedia Interface) is one of the uncompressed digital video / audio interface standards. HDMI provides interfaces between devices such as AV devices, monitors, and digital televisions in multimedia sources such as set-top boxes and DVD players that support them. HDMI is a modification of DVI, a standard interface for personal computers and displays, for AV electronic products. In December 2002, HDMI 1.0 specifications were decided. video. Since the audio is transmitted from the player to the television without compressing the audio, no decoder chip or software is required, and the connected devices are compatible with each other. In addition, since video, audio, and control signals are transmitted through a single cable, it is possible to simplify the wiring of the AV device, which is troublesome. In addition, since control signals can also be sent, each AV device can be used organically. In the physical layer, the difference signal (TMDS) is used to minimize the change, the high-bandwidth digital content protection (HDCP) is used for signal encryption, EDID is used for device authentication, and the Consumer Electronics Control (CEC) is used for connection of the entire control system. There are two types of connection connectors: Type A and Type B, the standard is Type A, and Type B is a 29 pin connector, defined to support resolutions in excess of 1080p (1920 x 1080).

Field Programmable Gate Array (FPGA) is a semiconductor device that includes a programmable logic element and a programmable internal line. Programmable logic elements can be programmed by replicating the functions of basic logic gates, such as AND, OR, XOR, NOT, and more complex decoders or combinatorial functions of computational functions. Most FPGAs contain a memory element with a simple flip-flop or a more complete block of memory for the programmable logic element.

The terms represented by DVI signal and HDMI signal in this specification refer to DVI system signal and HDMI system signal, respectively, and are referred to as DVI signal and HDMI signal for convenience in the description.

The broadcast signal in this specification may be a digital signal obtained by receiving an analog signal.

Figure 2 is a block diagram of an optical dispersion or optical transmission system of a digital signal according to an embodiment of the present invention. Figure 3 is a block diagram of a digital signal processing component of transceivers 100, 200 via an optical cable 300 in Figure 2 And FIG. 3B is a detailed block diagram of the digital signal processing components of the transceivers 100 and 200 through the optical cable 300 in FIG. 2, in which a serialized signal is transmitted from a plurality of 4 shows an optical dispersion or transmission system of a digital signal according to an embodiment of the present invention in which the optical signal is transmitted through the optical cable 300 in both directions, Fig.

2, a system for optical distribution or optical transmission of a digital signal using an optical cable includes a first transceiver 100, an optical cable 300, And second transceivers 200a and 200d. In the relationship between 200a and 200b, or between 200d and 200e, the first transceiver is 200a or 200d and the second transceiver is 200b or 200e. Similarly, in the relationship between 200b and 200c, or between 200e and 200f, the first transceiver is 200b or 200e and the second transceiver is 200c or 200f. As shown in the figure, a digital signal connecting one transceiver and another transceiver through an optical cable 300 is transmitted and can be extended to any desired length. The embodiment shown in FIG. 2 is a simplified block diagram for explaining the expandability, for example, and therefore the scope of the present invention is not necessarily limited to the embodiment shown in FIG. In the following description, the first transceiver 100 will be described as a first transceiver, and the second transceiver 200a or 200b directly connected to the first transceiver 100 through the optical cable 300 will be described with reference to FIG.

The first transceiver 100 receives an original digital signal such as a broadcast signal, a DVI signal, or an HDMI signal, encodes it, and serializes it into an electrical signal. The specific configuration of the first transceiver 100 will be described with reference to FIG.

The optical cable 300 is a path for transmitting a serialized signal from the first transceiver to the second transceiver 200 at the subsequent stage.

The second transceiver 200 receives the signal from the first transceiver 100 through the optical cable 300 and deserializes and decodes the signal to restore the original digital signal such as a broadcast signal, a DVI signal, or an HDMI signal To the terminals 1000a and 1000d.

Referring to FIG. 3A, the first transceiver 100 includes a receiver 110 receiving a digital original signal, an encoder 120 encoding an original digital signal from the receiver 110, And serializers 130a, 130b, 130c, 130d 130 for serializing the received signals into electrical signals. In the first transceiver 100, the encoder 120 and the serializer are implemented as an FPGA (Field Programmable Gate Array).

The second transceiver 200 includes a deserializer 260a, 260b, 260c, 260d, 260 deserialized from the serializer 130 to deserialize the signal transmitted through the optical cable 300, A decoder 270 for decoding a signal and restoring it to a original digital signal, and a transmitter 280 for transmitting the restored original digital signal to a terminal (1000a or 1000d in FIG. 2). In the second transceiver 200, deserializer 260 and decoder 270 are implemented in an FPGA.

Further, the optical dispersion or optical transmission system of the digital signal may further include an up-scaler (not shown) for raising the resolution of the original digital signal and transmitting the signal to the terminals 1000a, 1000b, 1000c, 1000d, 1000e and 1000f . For example, an upscaler may be added where the resolution needs to be increased, such as between 200a and 1000a, between 200b and 1000b, between 200c and 1000c, and so on.

In the above description, any of the transceivers is described as having either the function of the transmitter or the function of the receiver. However, any of the transceivers may include both the function of the transmitter and the function of the receiver. Reference is further made to FIG. In FIG. 4, the receiver 110 and the transmitter 280 are omitted for convenience.

3B illustrates an example in which the first transceiver 100 further includes a spreader 140 for spreading a serialized signal by the serializer 130 to a plurality of ports 310. [ As shown in FIG. 3B, it is possible to extend any one port to a plurality of ports through the distributor 140.

2 to 4, a system for optically distributing or transmitting optical signals of any one of a broadcast signal, a DVI signal, and an HDMI signal using an optical cable includes a first transceiver 100 The second transceiver 200 and the first transceiver 200 to the first transceiver 100 and the second transceiver 200 to the first transceiver 100 and the second transceiver 200, The digital transceiver 100 transmits the original digital signal to the second transceiver 200. The first transceiver 100 transmits the original digital signal to the second transceiver 200 through the optical cable 300, The first transceiver 100 receives and encodes the original digital signal and serializes it into an electrical signal and the second transceiver 200 transmits the serialized signal from the first transceiver 100 to the optical cable 3 00), deserializes and decodes the original digital signal, and when the original digital signal is transmitted from the second transceiver 200 to the first transceiver 100, the second transceiver The first transceiver 100 receives the serial signal from the second transceiver 200 through the optical cable 300, and performs deserialization and serialization on the serial signal. And reconstructs the original digital signal.

Here, the first transceiver 100 includes a receiver 110 (see FIG. 3A) for receiving the original digital signal, which is used for transmission in either direction of bidirectional transmission, And a serializer 130 for serializing an encoded signal in the encoder 120 into an electrical signal as well as a serializer 230 for use in transmission in the other direction of the bidirectional transmission A decoder 170 for decoding the deserialized signal and restoring the deserialized signal into an original digital signal, a decoder 170 for decoding the decoded original digital signal, (See FIG. 3A). In the relation with the first transceiver 100, reference numeral 10a denotes a control unit such as a computer, through which a digital signal is inputted, and the digital signal is directly supplied to the terminal 1000a side and displayed, Dispersed or optically transmitted and may be provided and displayed on the terminal 1000b side. Likewise, in relation to the second transceiver 200, reference numeral 10b denotes a control unit such as a computer, through which a digital signal is inputted, and the digital signal is directly transmitted to the terminal 1000b side, Or may be provided to the terminal 1000a and displayed.

Similar to the first transceiver 100, the second transceiver 200 includes a receiver 110 (see FIG. 3A) for receiving the original digital signal, which is used for transmission in either direction of bidirectional transmission, As well as a serializer 230 for serializing the encoded signal in the encoder 220 into an electrical signal, as well as a serializer 230 for encoding the original digital signal from the transmitter 220, A deserializer 260 used to deserialize a signal transmitted from the serializer 130 through the optical cable 300, a decoder 270 decoding the deserialized signal and restoring the deserialized signal into a raw digital signal, And a transmitter 280 (see FIG. 3A) for transmitting the recovered original digital signal.

In the first transceiver 100, the encoder 120 and the serializer 130 may be implemented in an FPGA, and the deserializer 160 and the decoder 170 may be implemented in an FPGA. Similarly, in the second transceiver 200, the encoder 220 and the serializer 230 may be implemented in an FPGA, and the deserializer 260 and the decoder 270 may be implemented in an FPGA.

As described above, the present invention provides an optical dispersion or optical transmission system of a digital signal that enables bidirectional transmission of a digital signal between transceivers through an optical cable, thereby distributing a digital signal such as a broadcast signal, a DVI signal, or an HDMI signal And has very high scalability in transmission.

100: first transceiver
200, 200a, 200b, 200c, 200d, 200e, 200f: a second transceiver
300: Optical cable
1000a, 1000b, 1000c, 1000d, 1000e, 1000f: terminal
110: receiver
120: Encoder
130, 130a, 130b, 130c, 130d: serializer
140: Dispersing machine
260, 260a, 260b, 260c, 260d: a deserializer
270: decoder
280: Transmitter

Claims (8)

A system for optically distributing a digital signal of a broadcast signal, a DVI signal, and an HDMI signal using an optical cable,
A first transceiver 100 for receiving and encoding an original digital signal and serializing the original digital signal into an electrical signal;
An optical cable (300) for transmitting a serialized signal from the first transceiver;
A second transceiver 200 receiving a signal from the first transceiver through the optical cable, deserializing and decoding the signal, restoring the original digital signal, and transmitting the original digital signal to the terminal; And
And an up-scaler located between the second transceiver and the terminal for raising the resolution of the original digital signal and sending it to the terminal side,
The first transceiver includes a receiver for receiving the original digital signal, an encoder for encoding the original digital signal from the receiver, a serializer for serializing the encoded signal in the encoder into an electrical signal, And a spreader 130 for distributing the serialized signal to a plurality of ports 310, the serializer being implemented as an FPGA,
The second transceiver includes a deserializer serialized from the serializer and deserializing a signal transmitted through the optical cable, a decoder for decoding the deserialized signal and restoring the deserialized signal into an original digital signal, Wherein the deserializer and the decoder are implemented as FPGAs, and a transmitter for transmitting the reconstructed original digital signal to the terminal side. delete delete delete delete A system for optically distributing a digital signal of a broadcast signal, a DVI signal, and an HDMI signal using an optical cable,
A first transceiver 100;
A second transceiver 200; And
And an optical cable (300) for providing a path for allowing bi-directional transmission of an original digital signal from the first transceiver to the second transceiver side or from the second transceiver to the first transceiver side However,
Wherein each of the first transceiver and the second transceiver comprises:
A transmitter for receiving the original digital signal; an encoder for encoding the original digital signal from the receiver; and an encoder for serializing the encoded signal into an electrical signal And a distributor for distributing the serialized signal by the serializer to a plurality of ports,
A deserializer for deserializing a signal transmitted from the serializer and transmitted through the optical cable, a demodulator for decoding the deserialized signal and outputting the original digital signal, And a transmitter for transmitting the restored original digital signal,
The another transceiver is connected to the second transceiver through an optical cable so that the original digital signal can be sent to another transceiver side having the same configuration as that of the second transceiver or to the terminal side, Wherein an up-scaler is provided between the second transceiver and the terminal for raising the resolution of the original digital signal and sending it to the terminal side. delete delete

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