Appeal No. 1999-1857
Application No. 08/579,156
BACKGROUND
The appellant's invention relates to a dual HDTV/NTSC receiving method using
symbol timing recovery and sync signal detection and apparatus thereof. An
understanding of the invention can be derived from a reading of exemplary claim 1,
which is reproduced below.
1. A receiver for selectively receiving one of a HDTV television signal and a NTSC
television signals coexisting in a plurality of television channels, the apparatus
comprising:
tuning means for converting a desired one of said HDTV and said NTSC signals
into an intermediate frequency signal;
sync detection means, coupled to receive said intermediate frequency signal
output from said tuning means, for detecting a sync signal of the NTSC signal;
timing recovery means, coupled to receive the intermediate frequency signal
output from said tuning means, for self-recovering symbol timing of an applied HDTV
signal, and outputting a symbol timing lock signal and an analog-to-digital converted
HDTV signal;
control means for judging whether a currently received television signal is said
NTSC signal or said HDTV signal based on the sync detection result of said sync
detection means and the symbol timing lock signal from said timing recovery means,
and for outputting a control signal according to a respective determination result; and
tuning control means for initially controlling said tuning means so that the desired
HDTV signal is received, and for subsequently controlling said tuning means on the
basis of the respective signal selected by said control signal among said HDTV and
NTSC signals output from said tuning means and said timing recovery means.
The prior art references of record relied upon by the examiner in rejecting the
appealed claims are:
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