Title:
DIGITAL BROADCAST RECEIVER
Document Type and Number:
WIPO Patent Application WO2004112384
Kind Code:
A3
Abstract:
A tuner (101) has a dual AGC function, and frequency-converts an input signal into an IF signal. An orthogonal detector (102) calculates a complex signal from the IF signal. A demodulator (103) demodulates a digital signal from the complex signals. An error corrector (104) corrects the error of the digital signal. A signal level detector (105) calculates a level judgment signal from the IF signal. A demodulation level detector (107) detects a signal level of a demodulation signal on a desired band from an output signal of the demodulator. When a demodulation level judgment unit (108) generates a judgment signal representing an influence from interference waves in adjacent channel affecting on a signal on the desired band from the demodulation signal, a control signal generator (106) feeds back a gain control signal to the tuner in accordance with the judgment signal.
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| JP5161253 | Variable gain circuit |
| JPS5344152 | AUTOMATIC GAIN CONTROL CIRCUIT BY PILOT SIGNAL |
| JPS5619214 | AGC CIRCUIT |
Inventors:
WATANABE KOU
HAYASHI DAISUKE
KATO HISAYA
YAGI TETSUYA
HAYASHI DAISUKE
KATO HISAYA
YAGI TETSUYA
Application Number:
PCT/JP2004/008704
Publication Date:
June 02, 2005
Filing Date:
June 15, 2004
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
WATANABE KOU
HAYASHI DAISUKE
KATO HISAYA
YAGI TETSUYA
WATANABE KOU
HAYASHI DAISUKE
KATO HISAYA
YAGI TETSUYA
International Classes:
H03G3/30; H04N5/44; H04N5/52; (IPC1-7): H04N5/52
Domestic Patent References:
| WO2001006777A1 | 2001-01-25 | |||
| WO1999056424A1 | 1999-11-04 |
Foreign References:
| US5999559A | 1999-12-07 | |||
| GB2348328A | 2000-09-27 | |||
| EP0814568A1 | 1997-12-29 | |||
| US20020131533A1 | 2002-09-19 | |||
| EP1067698A1 | 2001-01-10 |
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