JP2000201336A - Multi-media data processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently store received multi-media data and to reproduce video and sound in fidelity. SOLUTION: The multi-media data at a compressed and multiplexed state to be outputted from a ciphering and deciphering device 3 is stored in a digital data storage device 4. Thus, use efficiency of a storage medium of the digital data storage device 4 is enhanced. In addition, since degradation of data is eliminated in processes of storage and reading, fidelity reproduction of the video and the sound is enabled in a video output device 8 and a sound output device 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an image processing system comprising at least video data subjected to data compression processing (hereinafter referred to as compressed video data) and audio data subjected to data compression processing (hereinafter referred to as compressed audio data). The present invention relates to a multimedia data processing apparatus that receives multiplexed and modulated transmission data and decompresses compressed video data and compressed audio data, and in particular, reduces the capacity of a storage medium that stores multimedia data and stores and reads out the data. The present invention relates to a multimedia data processing device having improved data fidelity at the time of data transmission.

[0002]

2. Description of the Related Art With the recent development of digital communication technology, an infrastructure for distributing multimedia data via network lines such as satellite lines and terrestrial lines has been rapidly improved. Along with this, a receiving terminal device, that is, a terminal device capable of receiving and storing multimedia data is rapidly spreading.

FIG. 3 shows a block diagram of a conventional multimedia data processing apparatus. The multimedia data processing device includes a receiving device 101 that receives multimedia data from a network line, a demodulation device 102 that performs demodulation processing corresponding to a modulation method on a transmission side on the received multimedia data, An encryption / decryption device 103 that performs encryption / decryption processing corresponding to the encryption method on the transmission side on multimedia data, and compressed video data, compressed audio data, and other binary data output from the encryption / decryption device. A demultiplexing device 104 for demultiplexing the multiplexed multimedia data; and a video decompression device 105 for subjecting the demultiplexed compressed video data to video data decompression processing corresponding to the video data compression method on the transmission side.
And an audio decompression device 106 that performs an audio data decompression process corresponding to the transmission-side audio data compression method on the demultiplexed compressed audio data, and decompressed video data and audio output from the video decompression device 105. A data storage device 107 for storing the decompressed audio data output from the decompression device 106, and other binary data demultiplexed and demultiplexed by the demultiplexing device 104, and read from the video decompression device 105 or the data storage device 107. A video output device 108 for reproducing expanded video data that is output after being output, an audio output device 109 for reproducing expanded audio data output from the audio expansion device 106 or the data storage device 107, and a demultiplexing device. In the data processing device 110 which decodes other binary data demultiplexed by 104 or other binary data from the data storage device 107 It is made.

[0004]

However, in the above-described conventional multimedia data processing apparatus, when storing multimedia data received from a network line such as a satellite line or a terrestrial line, expanded video data and audio data are stored. , It was necessary to store a huge amount of video data. Therefore, the data storage device 107
Use efficiency of the storage medium was poor. Further, since the expanded video data and audio data are stored as analog data, it has been difficult to faithfully reproduce the data.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a multimedia data processing apparatus capable of efficiently storing received multimedia data and reproducing the stored multimedia faithfully. Aim.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention receives, from a network line, transmission data on which at least compressed video data and compressed audio data have been multiplexed and modulated. Receiving means, demodulating means for demodulating the output of the receiving means, digital data accumulating means for accumulating the output of the demodulating means, at least compressed video data and compressed audio data from the output of the demodulating means or the output of the digital data accumulating means. Multiplexing / demultiplexing means for demultiplexing compressed video data separated by the multiplexing / demultiplexing means, and audio decompressing means for expanding compressed audio data separated by the multiplexing / demultiplexing means. It was configured to be provided in the processing device. With this configuration, it is possible to improve the use efficiency of the storage medium of the digital data storage means for storing multimedia data, and to read the stored multimedia data faithfully.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention as set forth in claim 1 of the present invention relates to a receiving means for receiving, from a network line, transmission data on which at least compressed video data and compressed audio data have been multiplexed and modulated. Demodulating means for demodulating the output of the receiving means, digital data accumulating means for accumulating the output of the demodulating means, at least compressed video data and compressed audio data from the output of the demodulating means or the output of the digital data accumulating means. Multiplexing / demultiplexing means for demultiplexing the compressed video data separated by the multiplexing / demultiplexing means, and audio expanding means for expanding the compressed audio data separated by the multiplexing / demultiplexing means. A multimedia data processing apparatus characterized in that received and demodulated multimedia data are multiplexed and decoded. It has the effect of being accumulated in the barrel data storage means.

According to a second aspect of the present invention, in the first aspect of the invention, a modulating means for performing a modulation process on the output of the digital data storage means, and an output of the modulating means to a network line. A multimedia data processing device comprising:
The demodulated multimedia data is stored in the digital data storage means while being multiplexed, read, modulated, and transmitted to the network line.

According to a third aspect of the present invention, in the first aspect of the present invention, there is provided an encryption / decryption unit for performing an encryption / decryption process on an output of the demodulation unit, and the receiving unit is provided with at least a compression unit. Receives, from a network line, transmission data in which video data and compressed audio data have been subjected to multiplexing, encryption, and modulation, and outputs the output of the decryption unit to the digital data storage unit and the multiplex / demultiplex unit. This is a multimedia data processing device configured to input to the digital data storage device, and has an effect that the received, demodulated, and decrypted multimedia data is stored in the digital data storage means while being multiplexed.

According to a fourth aspect of the present invention, in the third aspect of the present invention, there is provided an encrypting means for performing an encryption process on an output of the digital data storage means, and an output of the encrypting means. A multimedia data processing device comprising a modulating means for performing a modulating process and a transmitting means for transmitting an output of the modulating means to a network line, wherein the received, demodulated and decrypted multimedia data is multiplexed. After being stored in the digital data storage means as it is, it is read, encrypted, modulated, and transmitted to the network line.

An embodiment of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) In a multimedia data processing apparatus according to a first embodiment of the present invention, received multimedia data is temporarily stored while being compressed and multiplexed, read and decompressed. It was configured to be able to play.

FIG. 1 is a block diagram of a multimedia data processing apparatus according to a first embodiment of the present invention.

This multimedia data processing device comprises a receiving device 1 for receiving multimedia data from a network line, and a demodulating device 2 for performing demodulation processing corresponding to the modulation method on the transmitting side on the received multimedia data.
And an encryption / decryption device 3 for performing an encryption / decryption process corresponding to the encryption method on the transmission side on the demodulated multimedia data, and digital data for storing multimedia data output from the encryption / decryption device 3 A storage device 4 and a multiplexing / demultiplexing device 5 for multiplexing / demultiplexing multimedia data in which the compressed video data, compressed audio data, and other binary data from the encryption / decryption device 3 or the digital data storage device 4 are multiplexed. A video decompression device 6 for performing a video data decompression process corresponding to a video data compression method on the transmission side on the demultiplexed compressed video data, and a transmission side audio data on the demultiplexed compressed audio data An audio decompression device 7 that performs audio data decompression processing corresponding to a compression method, and reproduces decompressed video data output from the video decompression device 6. That a video output apparatus 8, an audio output device 9 for reproducing audio data decompressed output from the audio decompression device 9, a data processing apparatus for decoding the other binary data separated multiplexed by the multiplexing separation unit 5
10 and are equipped.

In the multimedia data processing apparatus configured as described above, the multimedia data received by the receiving apparatus 1 from the network line is input to the demodulating apparatus 2 and demodulated for returning the modulation processing on the transmitting side to the original. Processed. The demodulated multimedia data is input to the encryption / decryption device 3, where the data is subjected to encryption / decryption processing for restoring the encryption processing on the transmission side. The decrypted multimedia data is input to the digital data storage device 4 and the demultiplexing device 5. The multimedia data input to the digital data storage device 4 is
The data is stored in a storage medium including a magnetic tape, a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

The multimedia data stored in the digital data storage device 4 is appropriately read and input to the demultiplexer 5. In the demultiplexing device 5, multimedia data input from the digital data storage device 4 or the decryption device 3 is separated into compressed video data, compressed audio data, and other binary data. The data is input to the decompression device 7 and the data processing device 10.

The compressed video data input to the video decompression device 6 is subjected to a data decompression process for restoring the data compression process on the transmission side, and is input to the video output device 8 for reproduction. The compressed audio data input to the audio decompression device 7 is subjected to a data decompression process for restoring the data compression process on the transmission side, and is input to the audio output device 9 for reproduction. Other binary data input to the data processing device 10 is decoded here.

As described above, in the multimedia data processing apparatus according to the first embodiment of the present invention, compressed video data and compressed audio data that have been compressed on the transmission side are stored without data expansion. Therefore, the storage medium can be used effectively. Further, since digital data is stored and read in the storage medium, the data is not degraded in the process of storing and reading. Therefore, the video output device 8 and the audio output device 9 can faithfully reproduce video and audio. Further, the multimedia data read from the digital data storage device 4 is:
Since the format is the same as that of the data output from the encryption / decryption device 3, it is possible to use the demultiplexing device 5 and subsequent devices in common when reproducing received data and when reading / reproducing stored data.

(Second Embodiment) In a multimedia data processing apparatus according to a second embodiment of the present invention, received multimedia data is temporarily stored while being compressed and multiplexed, and read and transmitted. It was configured to have a function.

FIG. 2 is a block diagram of a multimedia data processing apparatus according to a second embodiment of the present invention. This multimedia data processing device is different from the multimedia data processing device shown in FIG. 1 in that an encryption device 11 for performing an encryption process on an output of the digital data storage device 4 and an output device of the encryption device 11 A modulation device 12 for performing a modulation process, and a transmission device for transmitting an output of the modulation device 12 to a network line
13 and added. In this multimedia data processing device, a receiving device 1, a demodulation device 2, an encryption / decryption device 3,
Demultiplexer 5, video decompressor 6, audio decompressor 7,
Video output device 8, audio output device 9, data processing device 10
Have the same configuration and function as the blocks having the same names and the same reference numerals in FIG.

In the multimedia data processing device configured as described above, the receiving device 1 outputs the multimedia data received from the network line from the multiplexing / demultiplexing device 5 with or without the digital data storage device 4. The processing of outputting to the device 8, the audio output device 9, and the data output device 10 is the same as in the first embodiment. In this embodiment, the multimedia data read from the digital data storage device 4 is
After being subjected to encryption processing at 11 and modulation processing at modulation apparatus 12, the data is transmitted from transmission apparatus 13 to a network line. The encryption processing in the encryption apparatus 11, the modulation processing in the modulation apparatus 12, and the network line transmitted by the transmission apparatus 13 are respectively performed by the encryption processing on the transmission side of the reception apparatus 1.
The modulation processing or the network line may be the same or different.

As described above, according to the second embodiment of the present invention, the received multimedia data is efficiently stored without performing the data decompression process and the demultiplexing process, and the stored multimedia data is Thus, transmission can be performed again without performing data compression processing and multiplexing processing.

[0023]

According to the multimedia data processing device of the present invention, since the multimedia data which has been compressed and multiplexed is stored in the digital data storage device, the digital data storage device for storing the multimedia data is provided. In addition, the use efficiency of the storage medium can be improved, and multimedia data can be stored and read out faithfully. Also, the multimedia data read from the digital data storage device is
Since the format is the same as that of the data output from the decryption device, the demultiplexer and subsequent devices can be used commonly for reception / reproduction and read / reproduction, eliminating the need for extra data compression means. It has the effect of becoming.

[Brief description of the drawings]

FIG. 1 is a block diagram of a multimedia data processing device according to a first embodiment of the present invention;

FIG. 2 is a block diagram of a multimedia data processing device according to a second embodiment of the present invention;

FIG. 3 is a block diagram of a conventional multimedia data processing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving device 2 Demodulation device 3 Decryption device 4 Digital data storage device 5 Demultiplexing device 6 Video decompression device 7 Audio decompression device 8 Video output device 9 Audio output device 10 Data processing device 11 Encryption device 12 Modulation device 13 Transmission apparatus

Claims (4)

[Claims] 1. A receiving means for receiving, from a network line, transmission data on which at least compressed video data and compressed audio data have been multiplexed and modulated, and a demodulator for performing demodulation processing on an output of the receiving means. Means, digital data storage means for storing the output of the demodulation means,
Demultiplexing means for separating at least compressed video data and compressed audio data from the output of the demodulation means or the output of the digital data storage means, and video decompression means for decompressing the compressed video data separated by the demultiplexing means When,
A multimedia data processing apparatus, comprising: audio expansion means for expanding the compressed audio data separated by the demultiplexing / demultiplexing means. 2. The apparatus according to claim 1, further comprising: a modulating unit that modulates an output of the digital data storage unit; and a transmitting unit that transmits an output of the modulating unit to a network line. Multimedia data processing device. 3. An encryption / decryption unit for performing an encryption / decryption process on an output of the demodulation unit, wherein the receiving unit multiplexes, encrypts, and modulates at least compressed video data and compressed audio data. 2. The multi-function device according to claim 1, wherein the transmission data subjected to the decoding is received from a network line, and an output of the encryption / decryption unit is input to the digital data storage unit and the demultiplexing unit. Media data processing device. 4. An encryption unit for performing an encryption process on an output of the digital data storage unit, a modulation unit for performing a modulation process on an output of the encryption unit, and an output of the modulation unit is transmitted to a network line. 4. The multimedia data processing device according to claim 3, further comprising a transmission unit that performs the transmission.