H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/44, 350/72
H04N 11/12 (2006.01) H04N 11/14 (2006.01) H04N 11/24 (2006.01)
Patent
CA 1281411
ECONOMICAL HIGH-DEFINITION TELEVISION USING A MODULATED- SIGNAL COMBINATION Abstract A television (TV) system having a compatible high- definition signal receivable at conventional resolution by conventional TV receivers without auxiliary apparatus with carrier modulated high-definition luminance information being transmitted in a continuous spectrum spanning two conventional TV channels, carrier modulated quadrature amplitude modulated (QAM) high-frequency chrominance information being transmitted in one TV channel, and carrier modulated QAM low-frequency chrominance information being transmitted in another TV channel. At the transmitter, the high-definition luminance and chrominance signals are first comb filtered to reduce cross-effects between these types of information before modulation. A decoder recovers the high-definition luminance information by demodulating the transmitted signal and then selectively comb filtering the demodulated luminance information. The chrominance information is recovered from the transmitted signal by first notch filtering the transmitted high- definition signal to remove energy existing between the two sidebands of the QAM high-frequency chrominance information, and then, demodulating at the carrier frequency. The demodulating at the carrier frequency results in the QAM high- and low-frequency chrominance information forming a continuous spectrum that is then bandpass filtered. The high-definition I and Q chrominance signals are then recovered from the bandpass filtered chrominance information by a QAM demodulator. The QAM demodulation of the latter results in continuous high- definition I and Q chrominance signals. Another embodiment discloses a system having a compatible high-definition signal with carrier modulated high-definition luminance information being transmitted in a continuous spectrum spanning two TV channels including the high-frequency Q segment of the chrominance information as a single sideband component in one of the TV channels, the high-definition I chrominance segment and low-frequency Q segment is QAM coded and frequency translated to the other TV channel before being combined for transmission with the luminance and high-frequency Q segment.
498384
Locicero Joseph Lawrence
Pazarci Melih
Rzeszewski Theodore Stanley
American Telephone And Telegraph Company
Kirby Eades Gale Baker
LandOfFree
Economical high-definition television using a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Economical high-definition television using a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Economical high-definition television using a... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1316649