Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1998-07-23
2004-11-30
Hsu, Alpus H. (Department: 2665)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C375S240280
Reexamination Certificate
active
06826183
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a data transmission/reception method and apparatus thereof that is MPEG-2 based, transmitting and receiving input data, including at least video and audio data dependent upon the MPEG-2 standard. Wherein, the input data may also include “user data” containing “system data”, an “error correction code”, an “error detection code”, and other related connections. The audio data is not limited to “uncompressed audio data”, extending to “audio data, not dependent upon the MPEG-2 standard”.
Note that the MPEG-2 stands for “Moving Picture Experts Group 2”, and is a world-wide standard, in terms of image compression.
2. Description of the Related Art
The conventional MPEG-2 based transmission/reception of MPEG-2 based video data(hereafter, referred to as merely “video data”), uncompressed audio data, and user data are constructed in the following fashion: First, a transport stream is directly fabricated from a PES stream of the video data; another transport stream is then fabricated from a PES private stream of the uncompressed audio data; and yet another transport stream is fabricated from a PES private stream of the user data. Secondly, the fabricated transport streams are multiplexed sent and received.
“PES” stands for “Packetized Elementary Stream”, denoting a data stream such as packetized video/audio data, the format of which is defined in the MPEG-2 standard. The “PES stream” denotes a PES data stream, the format of which is defined in the MPEG-2 standard. The “transport stream” denotes a stream mainly used in a transmission system, the format of which is also defined in the MPEG-2 standard. The “PES private stream” denotes a user-usable data stream, defined in the MPEG-2 standard.
In addition, an error correction code and an error detection code, unique to a recording apparatus, may be attached as user data to video data. In this case, since the combination of the video data, the error correction code, and the error detection code is against the MPEG-2 standard, they are conventionally transmitted and received by being put into a PES private stream, and a transport stream is then fabricated with the PES private stream.
Furthermore, in a data transmission/reception apparatus handling both the 525/59.94 component signal and the 625/50 component signal, different transport streams are fabricated with respective PES private streams for the component signals. Wherein, the “525/59.94 component signal” denotes a component video signal dependent upon the NTSC(National Television System Committee) color system, with 525 lines and a field frequency of 59.94 Hz. More specifically, it includes three primary-color signals of R(Red), G(Green), and B(Blue). Alternatively, it includes a luminance signal(Y) and color difference signals(Cb and Cr). Note that hereafter the “525/59.94 component signal may be referred to as merely a “525 signal”. The “625/50 component signal” denotes a component video signal dependent upon the NTSC color system, with 625 lines and a field frequency of 50 Hz. Like the 525/59.94 component signal, the 625/50 component signal includes three primary-color signals of R(Red), G(Green), and B(Blue). Alternatively, it includes a luminance signal(Y) and color differential signals(Cb and Cr). Note that hereafter the “625/50 component signal may be referred to as simply a “625 signal”,
In the conventional technologies, the ratios of video data, uncompressed audio data, and user data to a frame of video data are not fixed. Moreover, their locations to the frame are also not fixed. In addition, detection of a transport header is made, however it is not protected.
Many earlier technologies relevant to the present invention are disclosed. For example, Laid-open Hei-7-30854 (hereafter, referred to as reference 1) describes an “image signal encoding apparatus” minimizing possible degradation of an encoded image quality, with a superior error-proof characteristic. Reference 1 describes: an image preprocessing unit that converts an image signal into an image signal with the format suitable for a low bit rate coding method; and an image coding unit that MPEG-based-encodes the converted image into the resulting encoded image data. A time-series data conversion unit then changes the time-series order of the encoded data into another, leading to decrease a possible encoding-error propagating area. Subsequently, a channel encoding unit attaches an error correction code, transmitting and recording the resultant data onto a transmission/recording medium. In regards to the conventional approaches, the possible encoding-error propagating area will be drastically reduced. This enables for successful fabrication of an image coding apparatus with a low bit rate coding and a high error-proof characteristic.
Laid-open Hei-5-119788 (hereafter, referred to as reference 2) discloses a “transmission/reception apparatus” exactly reproducing audio data and image data, which has external noise-proof and robust against a low transmission cable quality. According to the reference 2, a RF modulation circuit of a transmission unit 2PSK-modulates reproduced and EFM-encoded sound data, image data, and time data, digitally transmitting them to a reception unit, via a transmission line. A RF demodulation circuit of the reception unit 2PSK-demodulates the transmitted sound data. An EFM decoder then RFM-demodulates the resulting demodulated sound data, correcting for error and de-interleaving it. Since transmitted data is digital data, it can be safely transmitted even though the quality of the transmission line is low. In addition, even though an external noise may have negative influence on the data, it will be exactly reproduced by EFM-demodulating, correcting for error, and de-interleaving the influenced data by the aforementioned EFM-decoder.
Laid-open Hei-4-79588 (hereafter, referred to as reference 3) discloses a “digital transmitted data signal processing apparatus and recording/reproduction apparatus”, which can record an image and sound signals with a single format for both a high-speed recording and a normal-speed recording, on a magnetic tape by the following manner: First, the image and sound signals are compressed in their time axes. It is then compressed in terms of their bit length. Thirdly, a parity signal is attached to them. Lastly, they are subjected to modulation-processing, and then transmitted. According to the reference 3, the output signal of a compression circuit is received by a parity attachment circuit, in which the output signal is subjected to signal-processing such as attaching an error correction parity signal and outputting in serial order the resulting parity attached image and sound signals with a given transmission format, to a modulation circuit. The modulation circuit then modulates the serial signal in accordance with the characteristics of a transmission line, and the frequency band. For example, in the case of transmission via an electric radio wave, the signal is subjected to four-phase modulation (QPSK-modulation). A transmission circuit then outputs the resultant modulated signal to a transmission channel. Therefore, high-speed recording with a format identical to that of normal-speed recording, is allowed to be recorded onto the magnetic tape.
According to the aforementioned conventional technologies, for a MPEG-2 based transmission/reception of MPEG-2 based video data, uncompressed audio data, and user data, a problem exists where there is difficulty in identifying the uncompressed audio data and user data, since both the uncompressed audio data and the user data are PES private streams.
In addition, when an error correction code, an error detection code, and the other related connections unique to a recording apparatus, are attached to video data, they are combined into a PES private stream. A transport stream is then fabricated from the transmitted/received PES stream. In this case, a problem arises when the video data separated from a received data cannot be identified as MPEG-2 b
Dickstein Shapiro Morin & Oshinsky LLP.
Hsu Alpus H.
NEC Corporation
Nguyen Toan D.
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