KR100677970B1 - Transmission apparatus and method thereof for television system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission apparatus of a television system for transmitting a composite video signal received from the outside to a television, and more particularly, to a signal processing without additionally using a scaling chip for determining and scaling information of a composite video signal. A transmission apparatus of a television system capable of doing this, and a transmission method thereof.

To this end, the present invention provides an encoding chip for converting a composite video signal received from the outside to a television, and an AD conversion chip for converting an analog signal into a digital signal and outputting the analog signal to the encoding chip. And an AV decoder for determining information of the composite video signal, decoding the composite video signal, and outputting the composite video signal to the AD conversion chip, and controlling the encoding chip to enable adaptive encoding according to the determined information of the composite video signal. And an AV decoding chip having a microcomputer, and a transmitter for transmitting the encoded signal to the television. Accordingly, as the AV decoding chip determines information and controls the encoding chip, signal processing of the composite video signal is possible without using a separate scaling chip. Therefore, the product cost of the wireless transmission device is lowered, the labor maneuver is reduced, the production efficiency is improved.

Television, Transmitter, Encoding Chip, AV Decoding Chip, Scaling Chip, Wireless LAN

Description

Transmission apparatus and method for transmitting same in television system

1 is a schematic view showing a general wireless television system.

Figure 2 is a block diagram schematically showing a transmission apparatus of a wireless television system according to the prior art.

3 is a block diagram schematically showing the configuration of a radio transmitter of the radio television system according to the present invention.

4 is a block diagram showing in detail the configuration of a radio transmitter of the radio television system according to the present invention.

5 is a configuration diagram schematically showing a microcomputer of the wireless transmission apparatus according to the present invention.

6 is a flowchart illustrating an example of a method for wirelessly transmitting a composite video signal of a television system according to the present invention.

7 is a flowchart illustrating another example of a method for wirelessly transmitting a composite video signal of a television system according to the present invention.

<Description of the symbols for the main parts of the drawings>

310: AV decoding chip 311: AV decoder

312: microcomputer 312a: memory unit

312b: comparison unit 320: AD conversion chip

330: encoding chip 340: central processing unit

350: wireless LAN

The present invention relates to a transmission apparatus of a television system and a transmission method thereof, and more particularly, to a transmission of a television system capable of signal processing and transmitting a composite video signal received from the outside without separately using a scaling chip. An apparatus and a transmission method thereof.

In general, in the television broadcasting method, phase distortion, which is a defect of the National Television System Committee (NTSC) method and the NTSC method, in which the luminance (Y) and the color difference signals (I, Q) are multiplexed and the audio is carried on a frequency bandwidth of 6 MHz. As a method to improve the PAL (phase alteration by line) method proposed by Telefunken of Germany in 1962, NTSC and PAL broadcasting methods are configured to have a field frequency of 60Hz and 50Hz, respectively. Therefore, the television system should be able to determine the field frequency according to each broadcasting scheme and to adaptively process the composite video signal.

Hereinafter, a television system for receiving a composite video signal according to each broadcasting method will be described with reference to the accompanying drawings. However, here, the wireless television system will be described as an example.

1 is a block diagram schematically illustrating a general wireless television system, and FIG. 2 is a block diagram schematically illustrating a wireless transmission apparatus for a wireless television system according to the prior art.

As shown in the drawing, the wireless television system 100 receives a composite video signal input through a general airwave signal input port 111, a DVD / VCR input port 112, or an S-video input port (not shown). A wireless transmission apparatus 110 for transmitting to the wireless television 120, a wireless television 120 for receiving and displaying a composite video signal transmitted from the wireless transmission apparatus 110, and a user's control command. It is configured to include a remote control 130 for input.

Meanwhile, as shown in FIG. 2, the wireless transmitter 110 may include an audio / video decoding chip 210, an analog to digital conversion chip 220, and an audio / video decoding chip 220. And a scaling chip 230, and an encoding chip 240.

The AV decoding chip 210 is for decoding a composite video signal of an audio and video received from the outside, and the AD conversion chip 220 is for converting an analog signal output from the AV decoding chip 210 into a digital signal. will be. The scaling chip 230 is for controlling the encoding method of the encoding chip 240 by determining the information of the composite video signal converted into the digital signal, and for scaling the size of the image, and the encoding chip 240 is a scaling chip ( It is for adaptively encoding the composite video signal under the control of 230).

That is, since the NTSC composite video signal uses 60 Hz and the PAL composite video signal uses 50 Hz, the scaling chip 230 uses the encoding chip 240 according to the information (50 Hz / 60 Hz) for proper encoding. Will be controlled.

Although not shown, the composite video signal adaptively encoded as described above is transmitted to the wireless television 120 through a transmission unit such as a wireless LAN and an antenna. In addition, when a control signal such as a channel change is received by the wireless television 120 by the viewer's remote controller 130, the wireless television 120 transmits the control signal to the wireless transmitter 110. In addition, the wireless transmitter 110 adjusts a tuner according to the control signal to transmit the composite video signal of the channel selected by the viewer to the wireless television 120.

However, the wireless transmitter 110 according to the prior art as described above had to be separately provided with the scaling chip 230 to be adaptively encoded according to the information of the composite video signal received from the outside. Therefore, there is a problem that the product cost of the wireless transmission device 110 is increased, and the labor of labor increases.

Accordingly, the present invention provides a transmission apparatus and a transmission method thereof of a television system capable of judging information of a complex video signal received from the outside and adaptive encoding thereof according to the present invention without separately including the scaling chip as described above.

A transmission apparatus of a television system of the present invention for achieving the above object includes an encoding chip for converting the composite video signal into a predetermined code sequence in order to transmit a composite video signal received from the outside to a television, and An AD converter chip for converting the composite video signal into a digital signal and outputting the composite video signal to the encoding chip; and an AV decoder for determining information of the composite video signal and decoding the composite video signal and outputting the composite video signal to the AD conversion chip. And an AV decoding chip having a microcomputer for controlling the encoding chip to enable adaptive encoding according to the determined information of the composite video signal, and a transmitter for transmitting the encoded composite video signal to a television. do.

Here, the microcomputer preferably further includes a comparator for comparing the information of the preceding composite video signal stored in the memory unit with the information of the subsequently received composite video signal.

In addition, the memory unit is preferably a shift register.

The transmitter may be a wireless transmitter further comprising a wireless LAN connected to an output terminal of the encoding chip and an antenna connected to an output terminal of the wireless LAN.

Meanwhile, in the method for transmitting a composite video signal received from the outside to a television, a first step of receiving the composite video signal and a second monitoring whether or not a source switching interlock signal is received by a user input And if the source switch interlock signal is received, determine the information of the composite video signal, reset the encoding chip according to the information, encode the composite video signal, and if the source switch interlock signal is not received. And a third step of encoding the composite video signal without resetting the encoding chip and a fourth step of transmitting the encoded composite video signal to the television.

Here, the information of the composite video signal is determined by the AV decoder, and the reset of the encoding chip is controlled by a microcomputer that receives the information of the composite video signal from the AV decoder.

On the other hand, it is preferable that the encoding unit reset of the third step is performed only when the two pieces of information are different from each other by comparing the information of the previously received composite video signal with the newly received composite video signal.

The fourth step may be wirelessly transmitted by a wireless LAN connected to an output terminal of the encoding unit and an antenna connected to the wireless LAN.

Hereinafter, a wireless transmitter of a wireless television system according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram schematically showing the configuration of a wireless transmission apparatus of a wireless television system according to the present invention. As shown in FIG. 3, the wireless transmitter of the present invention includes an AV decoding chip 310, an AD conversion chip 320, and an encoding chip 330.

The AV decoding chip 310 decodes the composite video signal received from the outside and determines a broadcast method of the composite video signal. The information on the composite video signal determined as described above may be NTSC having a field frequency of 60 Hz or PAL having a field frequency of 50 Hz as described above. The AD conversion chip 320 converts the analog composite video signal output from the AV decoding chip 310 into a digital signal. The encoding chip 330 adaptively encodes the composite video signal according to the corresponding information input from the AV decoding chip 310, and further includes a scaling function of a screen size.

Hereinafter, referring to FIG. 4, a more clear understanding of a configuration capable of wireless transmission without having the scaling chip 230 as described above will be possible.

4 is a block diagram showing in detail the configuration of a wireless transmission apparatus of a wireless television system according to the present invention according to the present invention. As shown, the wireless transmitter of the present invention comprises an AV decoding chip 310 having an AV decoder 311 and a microcomputer 312, an AD conversion chip 320 and an encoding chip 330. .

The AV decoder 311 decodes a composite video signal such as a broadcast signal input from the outside, a video signal supplied from a video device, and an S-video signal supplied from various other digital devices, and the input composite video signal. Includes the ability to determine the information.

Here, the composite video signals are received by connecting an antenna cable, an RCA cable, an S-video cable, etc. to an input port of a wireless transmitting device. For example, a broadcast signal transmitted from a broadcast program provider is received through a VHF antenna cable connected to an input port of a wireless transmitter, and is input to the AV decoding chip 310 through a predetermined RF receiver including a tuner or the like.

On the other hand, the AV decoder 311 is connected to each other by the AD conversion chip 320 and the data line so that the decoded analog composite video signal can be converted into a digital signal. The AD conversion chip 320 is connected to each other by an encoding chip 330 and a data line so that the composite video signal converted into a digital signal can be encoded. In addition, in order to transmit the encoded composite video signal to the wireless television 120, the encoding chip 330 is connected to the wireless LAN 350 through an I2C bus mainly used for control, and the wireless LAN 350 is an antenna ( 360).

Further, the AV decoder 311 is connected to the microcomputer 312 by an I2C bus or the like so as to output the determined information of the composite video signal to the microcomputer 312. The microcomputer 312 stops the encoding chip 330 when the source switching interlock signal is received from the user, and then initializes the encoding chip 330 to enable adaptive encoding according to the corresponding information. It is connected to the encoding chip 330 by a bus.

The encoded composite video signal transmits the composite video signal to the wireless television via the wireless LAN 350 connected by the I2C bus and the antenna 360 connected to the wireless LAN 350. In this case, the CPU 340 adjusts the microcomputer 312 or controls the I2C buses according to a control signal such as a channel change received from the wireless television.

Accordingly, the encoding chip 330 can be adaptively encoded in synchronization with the corresponding information of the composite video signal. Although not shown, the encoding chip 330 may further include a screen converting unit for converting the size of the screen, which is also controlled by the microcomputer. Hereinafter, such a microcomputer will be described with reference to FIG. 5.

5 is a configuration diagram schematically showing a microcomputer of the wireless transmission apparatus according to the present invention. As shown, the microcomputer 312 includes a memory unit 312a capable of storing information of the received composite video signal, information of a preceding composite video signal previously stored in the memory unit 312a, and a newly received composite video signal. And a control unit 312c for controlling the encoding chip 330 according to whether or not to convert the information of the composite video signal determined by the comparing unit 312b. For this purpose, the memory unit 312a is preferably a shift register.

That is, as shown, when a user's source switching interlock command is received, information of a previously received composite video signal ("0": PAL) and newly received information of the composite video signal ("1": NTSC) ), Only when the two pieces of information are different from each other, the encoding chip 330 is stopped, and then the encoding chip 330 is reset in the format of the new broadcast method ("1": NTSC).

As described above, the wireless transmission apparatus of the present invention discriminates the information of the composite video signal from the AV decoder 311, and the microcomputer 312 controls the encoding chip 330 by using the corresponding information. Since the screen size can be adjusted by the chip 330, scaling processing corresponding to each broadcasting method is performed without a separate scaling chip 230. In addition, as described above, the microcomputer 312 may further include a comparator 312b to reduce the processing time of the composite image signal. Hereinafter, the operation of the radio transmitting apparatus will be described with reference to FIG.

6 is a flowchart schematically illustrating a method for transmitting a composite video signal of a wireless transmission apparatus according to the present invention. Referring to FIG. 6 with reference to the configuration of FIG. 4, first, a composite video signal is received from the outside (S600), and at this time, the microcomputer 312 determines whether a source switching interlock signal is received by a user's local key input ( S610). Here, the source means a composite video signal input from the outside.

If the source switching interlock signal is not input, the AV decoder 311 decodes the composite video signal (S650). Thereafter, the analog composite video signal decoded by the AD conversion chip 320 is converted into a digital signal (S660). The encoding chip 330 encodes the digital signal output from the AD conversion chip 320 (S670). As such, the encoded composite video signal is wirelessly transmitted to the wireless television 120 through the wireless LAN 350 and the antenna 360 (S680). Next, it is determined whether or not the broadcast transmission ends (S690) to terminate broadcast transmission or continue.

If the source switching interlock signal is input to the microcomputer 312, the microcomputer 312 stops encoding of the encoding chip 330 (S620). Thereafter, the AV decoder 311 determines the information of the composite video signal (S630) and outputs the corresponding information to the microcomputer 312, and the microcomputer 312 encodes the chip 330 to enable proper encoding of the broadcast information. Reset (S640). That is, the encoding chip 330 is initialized to enable encoding suitable for 50 Hz or 60 Hz. During this period, the viewer will only see a black screen, as in the conventional case.

Meanwhile, the composite video signal is decoded by the AV decoder 311 (S650), converted into a digital signal by the AD conversion chip 320 (S660), and adaptive in the encoding chip 330 reset to a new encoding format. Are encoded (S680). Then, the encoded composite video signal is wirelessly transmitted to the wireless television 120 through the wireless LAN 350 and the antenna 360 (S690). In operation S690, it is determined whether to terminate the transmission of the composite video signal.

In the above, the method of resetting the encoding chip 330 after stopping the encoding by the user's source switching interlock signal has been described as an example. However, in the present invention, adaptive encoding of the composite video signal is also possible without partially stopping the encoding, which will be described with reference to FIG. 7.

7 is a flowchart schematically showing another example of a composite video signal transmission method of a wireless transmission device according to the present invention. Referring to FIG. 7 with reference to the configuration of FIG. 4, first, a composite video signal is received from the outside (S700), and at this time, it is determined whether a source switching interlock signal by a user's local key input is received. In step S710). In this case, when the source switching interlock signal is not input, it has already been described with reference to FIG. 6 and will be omitted.

If the source switching interlock signal is input to the microcomputer 312 (S710), the comparator 312b of the microcomputer 312 compares the information of the composite video signal stored in the memory unit 312a with a predetermined period (S720).

If the preceding broadcast information and the broadcast information of the newly received composite video signal are the same, that is, the preceding information and the newly received information stored in the memory unit 312a are both 50Hz ("0" in FIG. 5) or 60Hz (FIG. If it is equal to each other as "1" of 5, the operation of stopping the encoding chip 330 is not performed, and then decoding (S740), digital conversion (S750), and encoding (S760) are performed.

However, if the information of the newly received composite video signal and the previously received composite video signal are different from each other, as described with reference to FIG. 6, the microcomputer 312 stops encoding of the encoding chip 330 (S730). The AV decoder 311 determines the information of the composite video signal and outputs the corresponding information to the microcomputer 312. The microcomputer 312 receiving the information of the composite video signal resets the encoding chip 330 to enable the encoder to appropriately encode the information (S731).

Next, the composite video signal is decoded (S740), converted into a digital signal (S750), and encoded by the encoding chip 330 reset to a new encoding format (S760). Thereafter, wireless transmission is performed to the wireless television 120 through the wireless LAN 350 and the antenna 360 (S770), and it is determined whether to terminate the transmission of the composite video signal (S780).

According to this, the excessive reset process of the encoding chip 330 is omitted, thereby improving the operation speed of the wireless transmitter.

In the above, the transmission apparatus of the television system and its transmission method which concern on this invention were demonstrated. Such a technical configuration of the present invention will be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

In particular, while the wireless television has been described as an example, the present invention is not limited thereto, and it is obvious that the present invention can be applied in various wired / wireless communication environments including the transmission apparatus using the AV decoder chip and the scaling chip. will be.

Accordingly, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the foregoing description, and the meanings of the claims and All changes or modifications derived from the scope and the equivalent concept should be construed as being included in the scope of the present invention.

As described above, according to the transmission apparatus of the television system and the transmission method thereof according to the present invention, the AV decoder determines the information of the composite video signal and the microcomputer controls the encoding chip. Therefore, since it is possible to adaptively encode the composite video signal without a separate scaling chip, the product cost is lowered and the labor cost is reduced, thereby improving the production efficiency of the product.

Claims (8)

An encoding chip for converting the composite video signal received from the outside into a predetermined code sequence; An AD conversion chip which converts the analog composite video signal into a digital signal and outputs the digital signal to the encoding chip; The AV chip determines the information of the composite video signal, decodes the composite video signal and outputs the composite video signal to the AD conversion chip, and enables the encoding chip to be adaptively encoded according to the determined information of the composite video signal. An AV decoding chip having a microcomputer for controlling; And A transmitter for transmitting the encoded composite video signal to a television Transmitter of the television system comprising a. The method of claim 1, And the microcomputer further comprises a comparing unit which compares the information of the previous composite video signal stored in the memory unit with the information of the subsequently received composite video signal. The method of claim 2, And the memory unit is a shift register. The method according to any one of claims 1 to 3, And the transmitter is a wireless transmitter further comprising a wireless LAN connected to an output terminal of the encoding chip and an antenna connected to an output terminal of the wireless LAN. A first step of receiving a composite video signal from the outside; A second step of monitoring whether a source switching interlock signal by a user input has been received; If the source switching interlock signal is received, after determining the information of the composite video signal and resetting the encoding chip according to the information, the composite video signal is encoded. If the source switching interlock signal is not received, the encoding is performed. A third step of encoding the composite video signal without resetting the chip; And A fourth step of transmitting the encoded composite video signal to the television; The transmission method of the television system transmission device characterized by including the. The method of claim 5, The information of the composite video signal is determined by an AV decoder, and the resetting of the encoding chip is controlled by a microcomputer that receives the information of the composite video signal from the AV decoder. The method of claim 5, The encoding unit reset of the third step may be performed only when the two pieces of information are different from each other by comparing the information of the previously received composite video signal with the newly received composite video signal. Transmission method. The method according to any one of claims 5 to 7, The fourth step is a transmission method of the television system transmitting apparatus, characterized in that the wireless transmission by the wireless LAN and the antenna connected to the output terminal of the encoding unit.

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