Title: Frequency variation multiple stage filtering method used in ATSC high resolution digital TV
Application Number: 200610147237 Application Date: 2006.12.14
Publication Number: 1988644 Publication Date: 2007.06.27
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04N7/015;H03H17/02
Applicant(s) Name: Central Research Inst., Shanghai Guangdian (Group) Address:
Inventor(s) Name: Liu Caiyong;Zhu Hai
Attorney & Agent: zhangjing ji
Abstract:
    The invention relates to a multi-frequency filtering method which applies on the ATSC HDTV digital televisions. It cascades a number of root raised cosine Finite Impulse Response Filter and other corrugated low Finite Impulse Response Filter to frequency-filter and get sample after the interpolation zero about the right baseband digital data interpolation zero, finally, it gets the Intermediate Frequency Digital figures. The invention greatly reduces the order of Digital Filter with the unchanged multiple sampling filter system and transmission function circumstances.
Time: 9