KR100443808B1 - A revive and transfer device and method of the compression image and audio data - Google Patents

Abstract

The present invention restores the compression of a stored video file that is compressed in a mass storage device such as a hard disk of a PC, a CD-ROM, a DVD, etc., and then reproduces it as an analog image or an audio signal to be viewed on a TV. The present invention relates to a device for reproducing and transmitting compressed video and audio data using a 2.4 GHz band for wireless transmission to a display device.

The present invention restores files compressed in various file formats used in a PC, and in the case of a PC having a built-in DVD-ROM, various codes are embedded in a program so that a DVD title can be played. Video file restoring means configured to restore compressed video files stored in the system, PCI bridge that converts the contents of the restored file to NTSC or PAL for viewing on TV, NTSC video data transmitted through the PCI bus Or a video scaler that converts the size of the image into a PAL screen format, a filter for removing distortion from the enlarged screen through the video scaler, and a video D / D that converts the digital video signal from the filter into an analog signal. Received from the A converter, the audio D / A converter, the video D / A converter and the audio D / A converter. A wireless transmitter comprising a 2.4 GHz transmitter for transmitting a signal at 2.4 GHz, a 2.4 GHz receiver for receiving a 2.4 GHz signal transmitted from the wireless transmitter, and a video signal and an audio signal from a signal received from the 2.4 GHz receiver. And a video receiving unit and an audio output unit for outputting through the unit, and a wireless receiving unit including a power supply unit for supplying operation power to the respective units.

Description

A revive and transfer device and method of the compression image and audio data

The present invention relates to an apparatus for reproducing and transmitting compressed video and audio data using the 2.4 GHz band and a method thereof, and more particularly to a stored video file compressed in a mass storage device such as a hard disk of a PC or a CD-ROM or DVD. It restores the compression and reproduces it as analog video and audio signal so that it can be viewed on TV and transmitted to the display device in a short distance wirelessly.

In general, video or audio data requires a large amount of storage space to be digitized and stored. In spite of the development of various storage media and the characteristics of storage media which are becoming more and more large-capacity, storing data in high-definition storage without video and audio compression requires a lot of cost and time.

Therefore, most video and audio are stored after being digitized and compressed. The most commonly used compression method is the MPEG (Moving Picture Experts Group) algorithm. In addition, various compression methods are used according to application fields.

Among the video data stored in this way, it is stored on the DVD, which can be viewed and listened to by video and audio through a TV after restoring and playing through a DVD player, etc., and linked with a PC such as a hard disk or CD-ROM. The data stored in the media can be viewed through a PC monitor through a process of restoring and reproducing using a dedicated playback software on a PC or the like.

Most of the video files except the video files played on the dedicated DVD player are viewed using the PC monitor. However, when viewing through the PC monitor, only small screens or large images may be provided due to differences in the general TV signal and resolution. In this case, a disadvantage occurs in that blocks are generated in the image.

In addition, there is a device that converts the screen appearing on the PC monitor so that you can watch it on a TV, etc., but this is a function that simply converts the screen of the PC monitor 1: 1 to correspond to the TV screen, etc. to be converted and transmitted so that it is displayed on the TV screen. Since the device only performs the video file, it cannot be played on the TV screen.

In such a prior art device, in order to view a video screen on a full screen through a TV or the like, a window for providing a video on the PC monitor must be enlarged to the full screen.

In addition, there is a conventional product that provides a function that shows only the video that is played on the TV screen through the full screen, but in this product, much of the performance of the VGA must be used to implement this function, There is a problem that leads to a slow overall speed.

The present invention is to solve such a conventional problem, the object of the present invention is to restore the various video compressed files stored in the PC to obtain the uncompressed video and audio data, and not the VGA output signal The present invention provides an apparatus and method for reproducing and transmitting compressed video and audio data, which processes video and audio data directly, and converts the video and audio data into a video signal and an audio signal for viewing on a TV.

1 is a block diagram showing the overall configuration of the present invention

2 is a block diagram of an RF transmitter of the present invention

3 is a block diagram of an RF receiver of the present invention.

4 is a connection diagram of the present invention and TV, etc.

5 is a flowchart of operation according to the present invention.

<Explanation of Signs of Major Parts of Drawings>

2: Video file restoration method 3: PCI bridge 4: Video scaler

5: filter 6: video converter 7: audio converter

8: 2.4 GHz transmitter 10: wireless transmitter 20: wireless receiver

21: 2.4 GHz receiver 22: Video output unit 23: Audio output unit

100: PC 200: TV

The apparatus for reproducing and transmitting compressed video and audio data according to the present invention for achieving the above object includes a restoring means for restoring a video file stored in a mass storage medium of a PC, which can be viewed on a TV with a PC monitor. Signal conversion means for converting NTSC or PAL, wireless transmission means for transmitting analog signals wirelessly to a remote TV, etc., receiving video and audio signals transmitted by RF and demodulating them to original analog video and audio. It is characterized by comprising a wireless receiving means for making and connecting to the TV and the like.

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

Figure 1 is a block diagram showing the overall configuration of the present invention, the moving picture file recovery means (2) is a PC of the DVD-ROM is built in to restore the compressed files in various file formats used in the PC (100) In this case, various codes are embedded in the program to play DVD titles, and the built-in codes are used to restore compressed video files stored in the PC.

Next, the wireless transmission means 10 converts the contents of the restored file into the NTSC or PAL by the PCI board, and provides the TV bridge 3 for viewing on the TV, and the NTSC image data transmitted through the PCI bus. Or a video scaler 4 for converting an image size to a PAL screen format, a filter 5 for removing distortion from a screen enlarged through the video scaler 4, and a digital output through the filter. A video D / A converter 6 for converting a video signal into an analog signal, an audio D / A converter 7 and a video D / A converter 6 and an audio D / A converter 7 It consists of a 2.4 GHz transmitter 8 for transmitting signals at 2.4 GHz.

Next, the wireless receiving means 20 outputs video and audio from the 2.4 GHz receiver 21, which receives the 2.4 GHz signal transmitted from the wireless transmitter 10, and the signal received from the 2.4 GHz receiver 21. The video output unit 22 and the audio output unit 23 to perform the output, and the power supply unit 24 for supplying the operating power to the respective parts.

Fig. 2 is a block diagram showing the detailed configuration of the 2.4 GHz transmitter 8 of Fig. 1, which shows pre-emphasis 31-33 for improving the frequency characteristics of analog-converted sound and video, and audio signals on the left and right sides. Modulators 34 and 35 for modulating the difference of signals to different frequencies, BPFs 36 and 37 for filtering the modulated audio signal to a required signal band, and video and audio amplification for amplifying video and audio signals. The signal from the amplifier 38, the VCO 39 receiving a signal from the PLL 42 and generating a frequency of 2.4 GHz, the transmission amplifier 40 for amplifying the transmission output, and the signal from the transmission amplifier 40. And an PLL 42 for providing a voltage according to the phase difference of the oscillation frequency.

3 is a block diagram illustrating a detailed configuration of the 2.4 GHz receiver 21 of FIG. 1, an RF input unit 51 for receiving a 2.4 GHz radio signal received through an antenna, and a low noise amplification for the input RF signal. A first RF amplifier 52, an RF AGC 53 for adjusting the gain of the RF signal through the first RF amplifier 52, and a second amplifier for gain and amplification of the signal output through the RF AGC 53; Second and third RF amplifiers 54 and 55, a BPF 56 for passing a signal amplified by the amplifier 55 to a set band, and a PLL synthesizer 58 for comparing a phase difference between an input frequency and an oscillation frequency. ), An OSC 59 generating an oscillation signal, a mixer 57 outputting an intermediate frequency from the signals input from the BPF 56 and the OSC 59, and an intermediate outputted through the mixer 57. An IF AGC 60 for adjusting the gain of the frequency, a small filter 61 for filtering the output signal of the IF AGC 60, and the small filter 61; Amplifiers 62 and 63 for amplifying the signal through a predetermined level; AGC detector 64 for detecting AGC from the signal output through the amplifier 53 and sending it to the RF AGC 53; 63. The PLL FM modulator 65 modulates the signal output from the terminal 63 and outputs the analog video / audio signal again. In the drawing, reference numerals 66 and 67 denote signal buffers.

4 is a diagram illustrating a connection configuration between the present invention and a TV. When a signal is wirelessly transmitted from the wireless transmitting means 10 embedded in the PC 100, the wireless receiving means connected to the TV 200 ( It is configured to receive and output the signal through 20).

The operation of the present invention configured as described above will be described in detail with reference to the operation flowchart of FIG. 5.

The video data embedded in the PC 100 is restored through a dedicated program and converted into uncompressed video and audio data, and the converted digital data is transferred to the PCI bridge 3 through the PCI bus, and the PCI bridge ( 3) Digital data is transmitted at high speed to the video D / A converter 6 and the audio data to the audio D / A converter 7 through the video scaler 4, respectively.

In general, the DMA method is used for high-speed transfers without any degradation in CPU speed. When using DMA, video and audio signals are transmitted by using each DMA so that video and audio are simultaneously transmitted.

The video signals among the transmitted video and audio signals are made with various screen resolutions according to the intention of the person producing the video file. Among the images that do not match the resolution of NTSC or PAL, the resolution must be converted. The part which plays this role is the video scaler 4.

In general, the size of the screen compressed and stored in the PC 100 is stored in the size of CIF or QCIF. In order to convert such video signals into NTSC or PAL, the video signal must be enlarged twice or four times in the horizontal and vertical directions.

The video scaler 4 not only enlarges the size of the input video in the above manner but also converts the video of any size to the resolution of NTSC or PAL.

The video from the video scaler 4 may be distorted in the process of enlarging the image, and the two-dimensional filter 5 is used to compensate for the distortion.

Accordingly, the digital image data passing through the filter 5 is converted into an analog signal through the video D / A converter 6, where the digital image data is converted into an analog composite or S-video analog signal.

Next, the digital audio signal input through the PCI bridge circuit is converted into an analog audio signal through the audio D / A converter 7, and the analog audio signal makes two channels of stereo.

In this case, when the input digital voice signal supports 5.1 channel, an additional analog to digital converter is used to generate the 5.1 channel voice signal.

The analog video signal and the audio signal thus produced are wirelessly transmitted through the 2.4 GHz transmitter 8.

That is, the 2.4GHZ transmitter 8 has an internal circuit as shown in FIG. 2. First, video and audio signals are input to the pre-emphasis unit 31-33, respectively. Highlights the necessary features of the incoming analog signal, making it a newly reconstructed signal for more efficient transmission.

The signal through the pre-emphasis 31-33 is then converted into an electrical signal in a modified form so that the transmitter can send a signal through the modulators 34 and 35, which are modulators.

In this case, the left voice signal is modulated to 6.5 MHz and the right voice signal to 6.0 MHz to make a difference between the left and right voice signals.

The modulated voice signal is filtered to the required signal band via the BPFs 36 and 37 to make the band set for transmission.

In addition, the audio signal that has passed through the BPFs 36 and 37 is amplified once again through the amplifier 38, and the VCO 39 receives the signal from the PLL 42 and again passes through the amplifier 40 and is required for transmission. The antenna 41 outputs a frequency of 2.4 GHz for transmitting video and audio data signals in the amplified state.

Here, the PLL 42 receives a clock signal from a transmission tuner and outputs a synchronized channel signal. The PLL 42 compares a phase difference between a frequency output from the VCO 39 and an input frequency inside the PLL 42 to obtain a desired frequency phase. Modulate and output the VCO oscillation frequency phase so as to output.

On the other hand, the 2.4 GHz receiver 21 of the wireless receiving means 20 receives the 2.4 GHz signal through the receiving antenna. The signal receives a specific RF signal including video and audio through the RF input unit 51 connected to the antenna.

The signal from the RF input unit 51 is amplified by the first RF amplifier 52 that performs the LNA function for low noise amplification. The LNA is used to minimize noise generated when amplifying the amplified RF signal sent by the transmitter.

The RF AGC 53 compresses a wide bandwidth input signal of a low noise amplified signal in a constant proportional relationship to adjust gain so that an output signal having a narrow bandwidth can be obtained.

The second amplifier 54 and the third amplifier 55 are used to obtain the amplification degree required by the amplifier circuit connected in series.

The BPF 56 filters the front end amplified signal output to the required signal band in order to pass the signal in the set band.

The PLL synthesizer 58 compares the internally input frequency with the phase of the oscillation frequency of the OSC 59 to output a stable oscillation frequency when the phases are the same or different by 90 degrees, and the OSC 59 when the phases are different. Since the phase of the oscillation frequency is modulated to output the phase of the oscillation frequency in the same direction as the received frequency, the desired frequency signal can be output.

The mixer 57 mixes the oscillation frequency signal output from the PLL synthesizer 58 and the oscillation frequency signal output through the BPF 56 to remove an intermediate frequency of 479.5 MHz from which a frequency band for transmitting video and audio signals has been removed. Output

The IF AGC 60 compresses the intermediate frequency output from the mixer 57 in proportion to the desired bandwidth and adjusts the gain so as to obtain an amplified signal having a narrow bandwidth.

The IF signal is filtered through the small filter 61 and the amplifiers 62 and 63 to demodulate the original video and audio signals by the PLL FM modulator 65 in the case of normal signals, and in the AGC detector 64 in the case of abnormal signals. The signal is fed back to the RF AGC 53 and the IF AGC 60, and gain adjustment is made to produce a signal of a normal frequency band.

As such, the video signal and the audio signal generated by the wireless transmission means 10 of the PC 100 are transmitted through a wireless reception means 20 such as an external TV 200 as shown in FIG. 4 through the video and audio output terminals. The signal transmitted from the PC 100 can be viewed through the screen of the TV 200.

5 is a flowchart illustrating an operation of a software unit for restoring and controlling image data of the present invention.

First, when a start command is executed in the process of restoring a compressed file, a file open function in Windows is called to open a file to be played, search for various installed codecs, and make a list of codecs to be played (S1, S2). step).

After checking the header of the opened file, figure out how it is compressed (step S3), and if the file is compressed using the codec already installed on the PC, specify the codec to be used from the already detected codec list, but it is not installed. If it is a compressed file created using a non-codec, the process for installing an appropriate codec is performed (steps S4-S6).

If compressed with an already installed codec, obtain the location and pointer of the file currently selected by the user (step S7) and start reading the file from this location (step S8), and install and compress a predefined codec while reading the file. Prepare to restore the old file.

If there is an error or a missing part in the compressed part while reading the file, the user is informed of the problem and the restoration is stopped (steps S9 and S10).

If the file is normal without any error during restoration, the video and audio are separately restored to be uncompressed raw data (steps S11 and S12).

The raw data thus made is transmitted to the monitor and speaker of the PC through the VGA and the sound card of the PC 100 and simultaneously to the PCI bridge 3 of the wireless transmission means 100 via the PCI bus of the PC 100 ( Step S13).

Through the present invention as described above, to restore the video file to which the various compression algorithms stored in the mass storage medium in a PC, etc. applied to make an analog signal and transmit this signal wirelessly to receive this signal from a remote place to connect to the TV, etc. In addition, it is possible to view a video that was only seen through the monitor of an existing PC by using a remote TV or the like. In addition, the present invention allows a video to be processed directly and independent of a screen on a PC monitor. Since it is possible to display on the TV screen, it is possible to use a limited PC resources more efficiently, such as being able to perform a separate operation on the PC while playing the video through the TV.

Claims (4)

In case of PC with DVD-ROM by restoring the compressed file in various file formats used in PC, various codes are embedded in the program so that DVD title can be played and stored in PC by using the built-in code. Video file restoration means for restoring a compressed video file to convert the video and audio data into an uncompressed state; PCI bridge to convert NTSC or PAL to high speed transmission of the converted video and audio data for viewing on TV, and video to convert the size of the video data transmitted through the PCI bridge into NTSC or PAL screen format. A scaler, a filter for removing distortion from a screen enlarged by the video scaler, a video D / A converter for converting a digital video signal from the filter into an analog signal, and digital audio data transmitted through the PCI bridge. Wireless transmitting means comprising a 2.4 GHz transmitter for transmitting signals received from the audio D / A converter to analog, the video D / A converter and the audio D / A converter at 2.4 GHz; A 2.4 GHz receiver for receiving a 2.4 GHz signal transmitted from the wireless transmitter, a video output unit and an audio output unit for outputting a video signal and an audio signal from a signal received from the 2.4 GHz receiver through a TV, etc. Apparatus for reproducing and transmitting compressed video and audio data, comprising a wireless receiving means comprising a power supply unit for supplying power. The apparatus of claim 1, wherein the 2.4 GHz transmitter comprises: a pre-emphasis for improving frequency characteristics of the analog-converted sound and video; a modulator for modulating the difference of signals with different frequencies for the left and right voice signals; A BPF for filtering the received audio signal to a required signal band, an amplifier for video audio amplification for amplifying video and audio signals, a VCO receiving a signal from a PLL and generating a frequency of 2.4 GHz, and amplifying a transmission output for an antenna. Apparatus for reproducing and transmitting compressed video and audio data, characterized in that it comprises a transmission amplifier for transmitting through, and a PLL for providing a voltage according to the phase difference of the oscillation frequency. The RF receiver of claim 1, wherein the 2.4 GHz receiver comprises: an RF input unit configured to receive a 2.4 GHz radio signal received through an antenna; a first RF amplifier for low noise amplification of the input RF signal; and an RF through the first RF amplifier. RF AGC for adjusting the gain of the signal, second and third RF amplifiers for performing gain and amplification of the signal output through the RF AGC, BPF for passing the signal amplified by the amplifier in the set band, and input PLL synthesizer for comparing the phase difference between the frequency and the oscillation frequency, the OSC generating the oscillation signal, the mixer outputting the intermediate frequency from the signals input from the BPF and OSC, and the gain of the intermediate frequency output through the mixer. IF AGC to be adjusted, a small filter for filtering the output signal of the IF AGC, an amplifier for amplifying the signal through the small filter to a predetermined level, AGC from the signal output through the amplifier And an AGC detector for detecting and sending the signal to the RF AGC, and a PLL FM modulator for modulating the signal output from the amplifier and outputting the analog video / audio signal again. . When the start command is executed when the compressed file is restored, the first step of calling the file open function in Windows to open the file to be played and searching the codecs to create a list of codecs to be played, Check the header of the opened file, find out how it is compressed, and if the file is compressed using the codec already installed on the PC, specify the codec to use from the list of codecs already found, but use the codec that is not installed. Is a compressed file, the second step of performing a process for installing an appropriate codec, If compressed with a codec that is already installed, the third step is to obtain the location and pointer of the file currently selected by the user and read the file. A fourth step of stopping the restoration if there is an error or a missing part in the compressed part while reading the file in the third step, A fifth step of reconstructing the video and the audio separately from the uncompressed video and audio data, if the file is a normal file without errors during the reconstruction in the third step; Transmitting the raw data to the monitor and the speaker of the PC through the VGA and the sound card of the PC and simultaneously transferring the raw data to the PCI bridge of the wireless transmission means through the PCI bus of the PC; Converts the video data of the raw data into a screen format of NTSC or PAL, converts the converted video data into an analog video signal, converts the audio data of the raw data into an analog signal, and converts the converted video data and audio And a seventh step of modulating and wirelessly transmitting data using a predetermined carrier frequency.