Television – Synchronization – Sync separation
Patent
1997-05-07
2000-08-15
Lee, Michael H.
Television
Synchronization
Sync separation
348525, 375365, H04N 510
Patent
active
061044350
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a high definition television (HDTV) receiver and its data receiving method, and more particularly, to an apparatus and method for generating a segment sync signal from data received.
BACKGROUND ART
Generally, for an HDTV, a television broadcasting station inserts a sync signal in front of signals transmitted in units of horizontal lines, and a receiver detects the sync signal from the transmitted signals, synchronizes the horizontal line signals, and processes the received signal. According to their types, HDTVs have different formats of transmission data of horizontal lines. FIG. 1 shows the format of data segment of US Grand Alliance (GA) HDTV, in which one data segment is made up with 832 symbols, 828 symbols for data and four symbols for a data segment sync signal. One data segment corresponds to one horizontal line of NTSC mode. The sync signal of the data segment is formed with four symbols indicative of the starting of the respective data segments, as shown in FIG. 1. Here, the data segment sync signal is made in such a certain pattern that four symbols have the signal levels of +5, -5, -5, +5, respectively. The data segment signals have random levels of signal.
For this reason, in an apparatus for receiving a transmission signal of GA mode, it must be processed after the sync signal of data segment must be detected for the first cycle of four symbols of the respective data segments for the synchronization of data segment signals received thereafter.
DISCLOSURE OF INVENTION
Therefore, it is an object of the present invention to provide an apparatus and method for generating a sync signal indicative of the starting of a data segment received in an HDTV.
It is another object of the present invention to provide an apparatus and method for generating a sync signal indicative of the starting of a data segment in an HDTV, using its signal level characteristic.
To accomplish the object of the present invention, there is provided an apparatus for generating a sync signal of a data segment in a high definition television, comprising: means for delaying and integrating received data segment signals in the period of the segment; means for delaying the output of the integration means in the period of sync signals, multiplying the delayed sync signals by a correlation value of a corresponding sync signal, and summing the multiplied sync signals, to thereby detect a sync signal having its peak for the period of the sync signal; and means having a predetermined reference value and for comparing the output of the sync detecting means with the reference value, to thereby generate the sync signal of data segment.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 shows a format of data segment in an HDTV;
FIG. 2 is a block diagram of a data segment sync signal generator in accordance with the present invention;
FIG. 3 is a circuit diagram of one embodiment of the data segment sync signal generating portion of FIG. 2;
FIG. 4A is a diagram of waveform showing the output characteristic of the segment sync detector of FIG. 3;
FIG. 4B is a diagram of waveform showing the output characteristic of the segment sync generator of FIG. 3; and
FIG. 5 is a circuit diagram of another embodiment of the data segment sync signal generating portion of FIG. 2.
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. It should be noted that like components are designated like reference numerals throughout the specification as many as possible.
In the preferred embodiment, the term "HDTV" means a HDTV of GA mode. The term "data segment signal" means a signal of 832 symbols in which 828 symbols are for data and four symbols are for sync signals, a shown in FIG. 1. The term "sync signal" means a symbol of four bits which indicates the starting of the data segment signal. The first and fourth sync symbols have a first signal level, whereas the second and third sync symbols have a se
REFERENCES:
patent: 5414699 (1995-05-01), Lee
patent: 5416524 (1995-05-01), Citta et al.
patent: 5594506 (1997-01-01), Yang
patent: 5648987 (1997-07-01), Yang et al.
Lee Michael H.
Samsung Electronics Co,. Ltd.
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