초록 ▼

A receiver receives an ATV (e.g. HDTV) signal in an area that is subject to NTSC co-channel and other interference. The received signal is precoded at the transmitter for enabling reduction of NTSC co-channel interference in the received signal. The received signal includes field sync signals that a

A receiver receives an ATV (e.g. HDTV) signal in an area that is subject to NTSC co-channel and other interference. The received signal is precoded at the transmitter for enabling reduction of NTSC co-channel interference in the received signal. The received signal includes field sync signals that are successively field combed to produce a subtraction signal. The subtraction signal is comb filtered to reduce NTSC co-channel interference and applied to a comparator along with the unfiltered subtraction signal. The comparator determines whether the level of NTSC co-channel interference is sufficiently great to subject the received ATV signal to comb filtering for reducing the NTSC co-channel interference.

대표청구항 ▼

A method of receiving an ATV signal comprising a plurality of multi level symbols, having recurrent field sync signals, in an area of co-channel and other interference comprising: combining corresponding portions of successive ones of said field sync signals to develop a subtraction signal; processi

A method of receiving an ATV signal comprising a plurality of multi level symbols, having recurrent field sync signals, in an area of co-channel and other interference comprising: combining corresponding portions of successive ones of said field sync signals to develop a subtraction signal; processing the subtraction signal to reduce co-channel interference; comparing the subtraction signal with the processed subtraction signal; and selectively processing the received ATV signal to reduce co-channel interference based upon the comparison.