H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/21 (2006.01)
Patent
CA 2254146
When analog and digital television signals are amplified by the same high- power amplifier in a combined analog- and digital-format television transmitter, intermodulation distortion (IMD) is caused by a digital television (DTV) signal that occupies a channel that is immediately below and adjacent an analog-format (e.g., NTSC) television signal. This cross-channel IMD must be corrected. The IMD correction may be achieved by essentially pre-correcting for radio frequency (RF) IMD by processing corresponding DTV and NTSC television signals at intermediate frequency (IF). The pre- correction is preferably achieved by tapping the DTV IF signal and using it to pre- compensate for the expected RF IMD that is inherent in the NTSC IF signal.
Acrodyne Industries Inc.
Ridout & Maybee Llp
LandOfFree
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