Filing Information

Inventor(s)	Hyeon-kyu Lee · Hyun-soo Shin · Ki-bum Kim ·
Assignee(s)	Samsung Electronics Co., Ltd. ·  View assignee updates
Attorney/Agent(s)	Sughrue, Mion, Zinn, Macpeak & Seas, PLLC ·
Primary Examiner	Sherrie Hsia ·
Application Number	US8890617
Filing date	07/09/1997
Issue date	06/13/2000
Predicted expiration date	07/09/2017
U.S. Classifications	348/554  · 348/555  ·
International Classifications	H04N 546  ·
Kind Code	A
International Classifications	348554;555;558;726;725 ·
Foreign Priority	KR9627670 - 07/09/1996 ·

Patent Family

Abstract

In an HDTV receiver which can be used with both an 8-VSB (Vestigial Side Band) system and a 16-VSB system, since there are so many common modulation parts which are commonly operated between the two systems, an operation mode is automatically switched by using the autocorrelation of the operation modes of the received data without requiring manual operation, and signals for controlling the entire system are thereby realized efficiently and economically in operating the HDTV receiver.

Independent Claims | See all claims (13)

1. 1. An apparatus for switching an operation mode of an HDTV system operating a plurality of multilevel modulation/demodulation systems, comprising:a mode switching unit for receiving a modulated input signal; selecting one operation mode from a plurality of operation modes based upon an autocorrelation of the operation modes for the multilevel modulation demodulation systems; and supplying a control signal and a sync control signal corresponding to the selected operation mode to the apparatus operated when switching the system between the plurality of multilevel modulation/demodulation systems.
2. 7. Amended) A method for switching an operation mode of an HDTV system operating a plurality of multilevel modulation/demodulation systems, comprising:receiving a modulated input signal;selecting one operation mode out of a plurality of operation modes based upon an autocorrelation of the operation modes for the multilevel modulation/demodulation systems; andsupplying a control signal and a sync control signal corresponding to the selected operation mode to the HDTV system operated when switching the operation mode of the HDTV system.
3. 13.13. An apparatus for switching an operation mode of an HDTV system, comprising. a tuner which tunes a transmitted HDTV signal;an intermediate frequency (IF) filter/sync detector which detects an intermediate frequency and a sync signal from the signal tuned by said tuner;an NTSC rejection filter which removes a carrier of an NTSC signal from an output of said IF filter/sync detector; an equalizer which removes an ISI (intersymbol interference) of a signal output from said NTSC rejection filter;a phase tracking loop connected to said equalizer and recovering a phase state by tracking a deviated phase;a Trellis Coded Modulation (TCM) decoder which corrects random errors in a signal output from said phase tracking loop;a demultiplexer which demultiplexes an output signal of said TCM decoder;a data deinterleaver connected to said demultiplexer and deinterleaving interleaved signals in a signal output from said demultiplexer;a Reed-Solomon decoder connected to said data deinterleaver and correcting burst errors in a signal output from said data deinterleaver;a derandomizer connected to said Reed-Solomon decoder and deramdomizing a randomized signal output from said Reed-Solomon decoder to remove the burstiness of the signal;a sync extraction unit attached to one side of said IF filter/sync detector and extracting the sync signal from the tuned HDTV signal; anda mode switching unit which receives an output of said sync extractions unit, selects one operation mode based upon an autocorrelation of operation modes for multilevel VSB (Vestigial Side Band) systems, and supplies a control signal and a sync control signal corresponding to the selected operation mode to the apparatus which is operated when switching the HDTV system.