KR20020018730A - Storing and playback of multi-channel video and audio signal - Google Patents

Abstract

PURPOSE: An apparatus for storing and reproducing multichannel video/audio signals is provided to simultaneously store and to reproduce multichannel video/audio signals, thus allowing a user to selectively watch or hear the signals. CONSTITUTION: An apparatus for storing and reproducing multichannel video/audio signals includes an RF receiver(11) for receiving RF video/audio signals and converting the signal into baseband signals, a multichannel tuner(12) for accepting the baseband signals to detect analog video/audio signals by channels, and A/D converters(13-1,13-2,13-n) for converting the analog signals into digital video/audio signals. The apparatus further has MPEG encoders(14-1,14-2,14-n) for MPEG-encoding the digital signals to generate video/audio MPEG signals, a PN signal generator(15) for generating a PN signal required for CDMA modulation/demodulation, and a CDMA modulator(16) for CDMA-modulating the MPEG signals using the PN signal. The apparatus also has a digital signal storage(17) for storing the modulated signals by channels, a CDMA demodulator for CDMA-demodulating the signals stored in the digital signal storage, a decoders for MPEG-decoding the demodulated signals to generate digital video/audio signals, D/A converters for converting the signals into baseband analog signals, and a multichannel modulator for converting the baseband signals into RF video/audio signals by channels.

Description

Multi-channel video / audio signal storage and playback device {STORING AND PLAYBACK OF MULTI-CHANNEL VIDEO AND AUDIO SIGNAL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage and playback apparatus for multichannel video / audio signals, and more particularly to a digital signal storage apparatus for multichannel video / audio signals using moving picture expert group (MPEG) and code division multiple access (CDMA) technologies. And a multi-channel video / audio signal storage and reproducing apparatus capable of storing the multi-channel video / audio signal from the digital signal storage device.

In general, a video tape recorder (VTR) is a device capable of simultaneously storing and reproducing video images and audio sounds, and is also referred to as a video cassette recorder (VCR) by using a cassette tape.

The VTR device includes an RF receiver, a tuner, a storage / playback head, a magnetic tape, and the like, and stores a video / audio signal received on a television (TV) on a magnetic tape, and stores the video / audio stored on the magnetic tape. Play the signal.

In this case, the VTR device may store and play only one channel video / audio signal.

In addition, recently widely used digital signal storage and reproducing apparatuses, such as a video CD device and a DVD ROM drive device, can store and reproduce only one channel of video / audio signal.

However, as described above, the conventional video / audio signal storage and reproducing apparatus such as a VTR device, a video CD device, a DVD ROM drive device, and the like store and reproduce only one channel of video / audio signal. There was a problem that it is impossible to store and play audio signals.

In particular, in the case of the VTR device, it is not only possible to store video / audio signals of other channels broadcasted at the same time, but also to reproduce video / audio signals of multiple channels.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to store a multi-channel video / audio signal in a digital signal storage device using MPEG encoding / decoding and CDMA modulation / demodulation techniques. Multi-channel video / audio allowing users to selectively watch multi-channel video / audio by simultaneously storing and playing back multi-channel video / audio signals, such as playing multi-channel video / audio signals from The present invention provides a device for storing and reproducing a signal.

1 is a block diagram of a storage device for a multi-channel video / audio signal according to the present invention;

2 is a block diagram of an apparatus for reproducing a multichannel video / audio signal according to the present invention;

3 is a block diagram of a multi-channel video / audio signal storage device according to the present invention in the case of using a disc;

4 is a block diagram of a multi-channel video / audio signal reproducing apparatus according to the present invention in the case of using a disc.

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

11: RF receiver 12: multi-channel tuner

12-1 to n: 1st to nth tuners 13-1 to n: 1st to nth A / D converters

14-1 to n, 32-1 to n: first to nth MPEG encoders

15,22,33,42 PN signal generator 16,34 CDMA modulator

17, 21: digital signal storage unit 23, 43: CDMA demodulator

24-1 to n, 44-1 to n: first to nth MPEG decoders

25-1 to n, 45-1 to n: First to nth D / A converters

26,46: multichannel modulator 31: video server

35: disk 41: disk driver

An apparatus for storing and reproducing a multichannel video / audio signal according to the present invention for achieving the above object includes an RF receiver for inputting a multichannel RF video / audio signal received by a television into a baseband signal; A multi-channel tuner comprising first to n-th tuners for inputting the baseband signal converted by the RF receiver to detect analog video / audio signals for each channel, and multiple detected by the first to n-th tuners in the multi-channel tuner. MPEG-1 first to n-th A / D converters for converting analog video / audio signals of channels into digital video / audio signals, and multi-channel digital video / audio signals converted by the first to n-th A / D converters. First through n-th MPEG encoders for encoding video / audio MPEG signals, a PN signal generator for generating PN signals required for CDMA modulation / demodulation, and a PN signal generator. A CDMA modulator for CDMA modulating a multichannel video / audio MPEG signal generated by the first to nth MPEG encoders using the generated PN signal, and a multichannel CDMA digital video / audio signal modulated by the CDMA modulator A digital signal storage unit for storing each channel, a CDMA demodulator for CDMA demodulating multi-channel CDMA digital video / audio signals stored in the digital signal storage unit using the PN signal generated by the PN signal generator, and the CDMA demodulator First to n-th MPEG decoders for generating digital video / audio signals by MPEG decoding the multi-channel video / audio MPEG signals demodulated in each channel, and the multi-channels generated by the first to n-th MPEG decoders. A first to n-th D / A converter for converting a digital video / audio signal into a baseband analog video / audio signal, and the first to n-th D / A converters It characterized in that the configuration of analog video / audio signals of the base band of the multi-channel transform in the ventilation to a multichannel modulator to convert RF video / audio signals for each channel.

Hereinafter, the configuration and operation of a multi-channel video / audio signal storage and playback apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a storage device for a multi-channel video / audio signal according to the present invention. An RF receiver 11 for inputting a multi-channel RF video / audio signal received on a television (TV) and converting the signal into a baseband signal 11 And a first to nth tuners 12-1 to n for inputting the baseband signal converted by the RF receiver 11 to detect analog video / audio signals for each channel. And first to nth A / s for converting the multichannel analog video / audio signals detected by the first to nth tuners 12-1 to n in the multichannel tuner 12 into digital video / audio signals. MPEG-encoding the multi-channel digital video / audio signals converted by the D converters 13-1 to n and the first to nth A / D converters 13-1 to n to generate a video / audio MPEG signal. First to n-th MPEG encoders 14-1 to n, and PN signals for generating PN signals required for CDMA modulation. CDMA modulation of the multi-channel video / audio MPEG signal generated by the first to nth MPEG encoders 14-1 to n using the generator 15 and the PN signal generated by the PN signal generator 15. CDMA modulator 16 and a digital signal storage unit 17 for storing the multi-channel CDMA digital video / audio signal modulated by the CDMA modulator 16 for each channel.

FIG. 2 is a block diagram of a multi-channel video / audio signal reproducing apparatus according to the present invention. The digital signal storage unit 21 stores multi-channel CDMA digital video / audio signals for each channel, and CDMA demodulation. CDMA demodulation of multi-channel CDMA digital video / audio signals stored in the digital signal storage unit 21 using the PN signal generator 22 generating the PN signal and the PN signal generated by the PN signal generator 22. First to n-th MPEG decoders 24 to MPEG-decode the multi-channel video / audio MPEG signals demodulated by the CDMA demodulator 23 for each channel to generate digital video / audio signals. -1 to n), and first to second converting multichannel digital video / audio signals generated by the first to nth MPEG decoders 24-1 to n into baseband analog video / audio signals. n D / A converters 25-1 to n, The multichannel baseband analog video / audio signal converted by the first to nth D / A converters 25-1 to n is converted into an RF video / audio signal for each channel. It is composed.

The present invention utilizes the CDMA modulation / demodulation technique by providing the CDMA modulator 16 and the CDMA demodulator 23 as described above because of the effect of increasing the capacity of the communication in the CDMA communication system.

In addition, the present invention is applicable to a digital multichannel disk (Disk) application.

3 is a block diagram of a multi-channel video / audio signal storage device according to the present invention when a disc is used, and stores a multi-channel digital video / audio signal and, if necessary, digital video / audio for each channel. A first to n-th MPEG encoder for generating a video / audio MPEG signal by MPEG encoding the video server 31 for outputting a signal and the multi-channel digital video / audio signal output from the video server 31 for each channel; 32-1 to n, a PN signal generator 33 for generating a PN signal required for CDMA modulation, and a first to n-th MPEG decoder using the PN signal generated by the PN signal generator 33; A CDMA modulator 34 for performing CDMA modulation on the multi-channel video / audio MPEG signal generated at 32-1 to n, and a multi-channel CDMA digital video / audio signal modulated by the CDMA modulator 34 for each channel. Not saved It consists of a disc (35).

Fig. 4 is a block diagram of a multi-channel video / audio signal reproducing apparatus according to the present invention when a disc is used. The disc driver 41 driving the disc 35 to read multi-channel CDMA digital video / audio signals is shown in Fig. 4. ), A PN signal generator 42 for generating a PN signal required for CDMA demodulation, and a multi-channel CDMA digital video read by the disk driver 41 using the PN signal generated by the PN signal generator 42. CDMA demodulator 43 for CDMA demodulation / audio signal, and first to second MPEG decoding of the multi-channel video / audio MPEG signal demodulated by the CDMA demodulator 43 for each channel to generate a digital video / audio signal. Multi-channel digital video / audio signals generated by the n-decode decoders 44-1 to n and the first to n-th MPEG decoders 44-1 to n are converted into baseband analog video / audio signals. Convert Is a multi-channel baseband analog video / audio signal converted by the first through n-th D / A converters 45-1 through n and the first through n-th D / A converters 45-1 through n. Is composed of a multi-channel modulator 46 for converting each channel into an RF video / audio signal.

Referring to the operation of the multi-channel video / audio signal storage and playback device of the present invention configured as described above are as follows.

First, referring to FIG. 1, an operation of a storage device of a multichannel video / audio signal is described. The RF receiver 11 converts a multichannel RF video / audio signal received from a television (TV) into a baseband signal. The first to nth tuners 12-1 to n in the multichannel tuner 12 input baseband signals converted by the RF receiver 11 to detect analog video / audio signals for each channel.

Subsequently, the first through n-th A / D converters 13-1 through n detect the multi-channel analog video / audio detected by the first through nth tuners 12-1 through n in the multichannel tuner 12. Converts the signal into a digital video / audio signal, and the first through n-th MPEG encoders 14-1 through n convert the digital signal of the multi-channel converted by the first through n-th A / D converters 13-1 through n. The video / audio signal is MPEG encoded to generate a video / audio MPEG signal.

The PN signal generator 15 generates a PN signal necessary for CDMA modulation of the CDMA modulator 16 and outputs the PN signal to the CDMA modulator 16.

Then, the CDMA modulator 16 uses the PN signal generated by the PN signal generator 15 to output the multi-channel video / audio MPEG signal generated by the first to n-th MPEG encoders 14-1 to n. CDMA modulation is performed to store the modulated multi-channel CDMA digital video / audio signal in the digital signal storage unit 17 for each channel.

Next, referring to FIG. 2, the CDMA demodulator 23 uses the PN signal generated by the PN signal generator 22 to describe the operation of the apparatus for reproducing the multichannel video / audio signal. CDMA demodulates the multichannel CDMA digital video / audio signal stored in the CDMA demodulator, and the first to n-th MPEG decoders 24-1 to n decode the multichannel video / audio MPEG signal demodulated by the CDMA demodulator 23. MPEG video is decoded for each channel to generate a digital video / audio signal.

Subsequently, the first to n-th D / A converters 25-1 to n convert the multi-channel digital video / audio signals generated by the first to n-th MPEG decoders 24-1 to n into baseband. It is converted into an analog video / audio signal and output to the multichannel modulator 26.

Then, the multi-channel modulator 26 converts the multi-channel baseband analog video / audio signal converted by the first to n-th D / A converters 25-1 to n into RF video / audio signals for each channel. By converting and inputting to a television (TV), the user can watch multiple channels of video / audio simultaneously.

3, the operation of the multi-channel video / audio signal storage device in the case of using the disc 35 will be described. In the video server 31, the first to n-th MPEG encoders 32-1 to n are used. A video / audio MPEG signal is generated by MPEG encoding the output multi-channel digital video / audio signal for each channel.

Subsequently, the CDMA modulator 34 uses the PN signal generated by the PN signal generator 33 to convert the multi-channel video / audio MPEG signal generated by the first to n-th MPEG encoders 32-1 to n into CDMA. It modulates and stores the modulated multichannel CDMA digital video / audio signal on the disc 35 for each channel.

Finally, referring to FIG. 4, the operation of the multichannel video / audio signal reproducing apparatus in the case of using the disc 35 will be described. In the CDMA demodulator 43, the disc 35 is driven by the disc driver 41. CDMA demodulates the multi-channel CDMA digital video / audio signal to be read.

Subsequently, the first to n-th MPEG decoders 44-1 to n MPEG-decode the multi-channel video / audio MPEG signals demodulated by the CDMA demodulator 43 for each channel to generate digital video / audio signals. The first to n-th D / A converters 45-1 to n convert the multi-channel digital video / audio signals generated by the first to n-th MPEG decoders 44-1 to n into baseband analog. A video / audio signal is converted and output to the multichannel modulator 46.

Then, the multi-channel modulator 46 converts the multi-channel baseband analog video / audio signal converted by the first to n-th D / A converters 45-1 to n into RF video / audio signals for each channel. By converting and inputting to a television (TV), the user can watch multiple channels of video / audio simultaneously.

As described above, according to the present invention, by using MPEG encoding / decoding and CDMA modulation / demodulation techniques, multi-channel digital video / audio signals can be simultaneously stored in a digital signal storage device and can be reproduced from a digital signal storage device. It is possible to watch video / audio simultaneously.

As described above, multichannel video / audio signals are stored in a digital signal storage device using MPEG and CDMA techniques, and the multichannel video / audio signals are reproduced from the digital signal storage device. As the video / audio signal can be stored and played back, the user can select and watch multiple channels of video / audio simultaneously.

In addition, it is possible not only to store video / audio signals of multiple channels that are broadcast at the same time, but also to play them simultaneously, so that the user can watch the broadcast more conveniently and can store and play more video / audio. There is.

Claims (2)

An RF receiver for inputting a multi-channel RF video / audio signal received by a television into a baseband signal; A multichannel tuner comprising first to nth tuners for inputting the baseband signal converted by the RF receiver to detect analog video / audio signals for each channel; First to n-th A / D converters for converting the multi-channel analog video / audio signals detected by the first to nth tuners in the multichannel tuner into digital video / audio signals; First to n-th MPEG encoders which MPEG-encode the multi-channel digital video / audio signals converted by the first to n-th A / D converters to generate video / audio MPEG signals; A PN signal generator for generating a PN signal required for CDMA modulation / demodulation; A CDMA modulator for performing CDMA modulation on the multi-channel video / audio MPEG signal generated by the first to n-th MPEG encoders using the PN signal generated by the PN signal generator; A digital signal storage unit for storing the multi-channel CDMA digital video / audio signal modulated by the CDMA modulator for each channel; A CDMA demodulator for CDMA demodulating a multi-channel CDMA digital video / audio signal stored in the digital signal storage unit by using the PN signal generated by the PN signal generator; First to n-th MPEG decoders for decoding the multi-channel video / audio MPEG signals demodulated by the CDMA demodulator for each channel to generate digital video / audio signals; First to n-th D / A converters for converting the multichannel digital video / audio signals generated by the first to n-th MPEG decoders into baseband analog video / audio signals; Multi-channel video / characterized in that the multi-channel modulator for converting the baseband analog video / audio signal of the multi-channel converted by the first to n-th D / A converter for each channel into RF video / audio signal Apparatus for storing and reproducing audio signals. The method of claim 1, wherein when the digital signal storage unit is a disk, A video server for storing multi-channel digital video / audio signals and outputting digital video / audio signals for each channel as needed; First to n-th MPEG encoders for encoding a multi-channel digital video / audio signal output from the video server for each channel to generate a video / audio MPEG signal; A PN signal generator for generating a PN signal required for CDMA modulation / demodulation; A CDMA modulator for performing CDMA modulation on the multi-channel video / audio MPEG signal generated by the first to n-th MPEG decoders using the PN signal generated by the PN signal generator; A disk for storing the multi-channel CDMA digital video / audio signal modulated by the CDMA modulator for each channel; A disk driver for driving the disk to read a multichannel CDMA digital video / audio signal; A CDMA demodulator for CDMA demodulating a multi-channel CDMA digital video / audio signal read by the disc driver using the PN signal generated by the PN signal generator; First to n-th MPEG decoders for decoding the multi-channel video / audio MPEG signals demodulated by the CDMA demodulator for each channel to generate digital video / audio signals; First to n-th D / A converters for converting the multichannel digital video / audio signals generated by the first to n-th MPEG decoders into baseband analog video / audio signals; Multi-channel video / characterized in that the multi-channel modulator for converting the baseband analog video / audio signal of the multi-channel converted by the first to n-th D / A converter for each channel into RF video / audio signal Apparatus for storing and reproducing audio signals.