Title:
【発明の名称】復調位相誤差を減じるための回路
Document Type and Number:
Japanese Patent JP2627270
Kind Code:
B2
Abstract:
In a television receiver including an automatic deghosting system 24, Fig. 1 (634, Fig. 6) means 18, 22 are provided for synchronously demodulating IF television signals to generate baseband signals representing the in phase (I) and quadrature phase (Q) modulation components of the IF signals. A carrier signal extractor circuit 14 extracts the received carrier signal from the radio frequency television signal. A phase locked loop 16 coupled to the carrier signal extracting circuit generates a phase difference signal representing the difference in phase between the oscillatory and the extracted carrier signals. A demodulation phase error detector 26, (630) coupled to the synchronous demodulation means generates a phase control signal proportional to the difference in phase between the direct carrier signal as broadcast and the received carrier signal which may include ghosts. A phase correction circuit 312, 316, 318, Fig. 3 or a ROM (632, Fig. 6) responds to the phase control signal and modifies the phase difference signal (or the first baseband signal) to generate a modified first baseband signal with substantially reduced crosstalk distortion components.
More Like This:
Inventors:
Edward Litchiard Quimble The Third
Henry Garton Lewis Giunia
Henry Garton Lewis Giunia
Application Number:
JP13103987A
Publication Date:
July 02, 1997
Filing Date:
May 27, 1987
Export Citation:
Assignee:
RCS Thomson Licensing Corporation
International Classes:
H03D3/00; H04N5/21; H04N5/455; (IPC1-7): H04N5/455; H04N5/21
Domestic Patent References:
| JP535559A | ||||
| JP50151025A |
Attorney, Agent or Firm:
Hiroshi Tanaka (1 outside)