Pulse or digital communications – Receivers – Automatic gain control
Reexamination Certificate
2007-11-27
2007-11-27
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Automatic gain control
C375S219000, C375S260000, C375S340000, C375S233000, C348S678000, C348S455000, C348S555000, C348S685000, C330S254000, C330S279000, C330S280000
Reexamination Certificate
active
09878427
ABSTRACT:
In a digital broadcast receiving apparatus for amplifying a received modulated digital signal wave with automatically adjusted gain and demodulating the modulated signal wave to a digital signal, a tuner frequency-converts the modulated digital signal wave to generate a first modulated signal. A first automatic gain control amplification unit controls gain of the tuner to make a level of the first modulated signal at a first predetermined level. An A/D converter converts the first modulated signal into a second modulated signal. A demodulator demodulates the second modulated signal to generate a first demodulated digital signal. A second automatic gain control amplifier generates a second demodulated digital signal where frequency fluctuations included in the digital modulated wave are eliminated.
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Azakami Hiroshi
Konishi Takaaki
Tokunaga Naoya
Ueda Kazuya
Fan Chieh M.
Wenderoth , Lind & Ponack, L.L.P.
Zheng Eva
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