H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 11/06 (2006.01) H04N 5/38 (2006.01) H04N 5/44 (2006.01) H04N 11/14 (2006.01)
Patent
CA 2260491
An N-level digitally encoded signal at a symbol rate f s substantially equal to three times the NTSC color subcarrier frequency, N being a plural integer, modulates a carrier signal of a frequency within a few hundred kilocycles of the NTSC audio carrier, for transmission through a channel subject at times to the presence of a co-channel NTSC analog television signal. The modulation is suppressed-carrier amplitude-modulation generating first and second amplitude-modulation sidebands. Any portion of the amplitude-modulation sidebands extending outside the channel is suppressed in the transmitted signal, thereby making the first amplitude- modulation sideband a vestigial sideband providing an image for only a portion of the second amplitude-modulation sideband closer in frequency to the carrier signal. The amplitude responses of the vestigial sideband and the portion of the second amplitude-modulation sideband closer in frequency to the carrier signal are halved in the transmitted signal compared to the amplitude response of a remaining portion of the second amplitude-modulation sideband further in frequency from the carrier signal. A fixed-amplitude pilot signal of the same frequency as the suppressed carrier is included in the transmitted signal.
R. William Wray & Associates
Samsung Electronics Co. Ltd.
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