Receiver for digital television signals having carriers near upper frequency boundaries of TV broadcasting channels
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 23, 2003
Grant Date -
N/A
app pub date -
Feb 2, 1999
filing date -
Feb 20, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a receiver for receiving digital television (DTV) signals with carriers near the upper frequency boundaries of TV broadcasting channels, co-channel interfering NTSC video carrier and its lower frequency sidebands are removed from intermediate-frequency signal by trap filtering, preferably in SAW filtering used in the intermediate-frequency amplifier. Co-channel interfering NTSC chroma burst and lower frequency chroma sidebands also are removed from intermediate-frequency signal by trap filtering. Artifacts of co-channel interfering NTSC audio signal in baseband DTV signal recovered by in-phase synchrodyne circuitry are cancelled using Hilbert-transformed artifacts of co-channel interfering NTSC audio signal recovered by quadrature-phase synchrodyne circuitry. Locating DTV carriers close to 270 kHz below the uppermost limits of the TV broadcasting channels facilitates artifacts arising from chroma signals, video carriers and low-frequency video modulation of co-channel interfering NTSC signals being further reduced using comb filtering.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully