Pulse or digital communications – Repeaters
Reexamination Certificate
2007-11-27
2007-11-27
Tran, Khanh C. (Department: 2611)
Pulse or digital communications
Repeaters
Reexamination Certificate
active
10839315
ABSTRACT:
Provided is a modulation apparatus that can reduce time delay of on-channel repeaters in a terrestrial digital television broadcasting system. The time delay is caused by a filter during the modulation operation in the on-channel repeaters. The modulation apparatus of the present research includes: a baseband signal forming unit for forming a baseband signal by combining the output signals of an equalization unit with the pre-defined field/segment synchronization signals in the on-channel repeaters; a pilot inserting unit for inserting a pilot signal to the baseband signal; an up-sampling unit for up-sampling the baseband signal with the pilot signal; a VSB filtering unit for filtering the up-sampled baseband signal based on a Window technique and/or an Equi-Ripple filter to thereby form an in-phase (I) signal and a quadrature (Q) signal; an up-converting unit for up-converting the frequencies of the filtered I and Q signals to frequencies of an intermediate frequency (IF) band; an adding unit for adding the up-converted I and Q signals and converting a resultant signal into a digital VSB signal of the IF band; and a digital-to-analogue converting unit for converting the digital signal of the IF band to an analogue signal.
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patent: 6128539 (2000-10-01), Markandey et al.
patent: 6603804 (2003-08-01), Khoini-Poorfard et al.
patent: 6618443 (2003-09-01), Kim et al.
“On-Channel Repeater for Digital Television Boradcasting Service”, IEEE Transactions on Broadcasting, vol. 48, No. 2, Jun. 2002, pp. 97-102.
Kim Seung-Won
Lee Soo-In
Lee Yong-Tae
Park Sung-Ik
Seo Jae-Hyun
Blakely & Sokoloff, Taylor & Zafman
Electronics and Telecommunications Research Institute
Tran Khanh C.
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