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1.发明公开TUNER INPUT FILTER WITH ELECTRONICALLY ADJUSTABLE CENTER FREQUENCY FOR ADAPTING TO ANTENNA CHARACTERISTIC 审中-公开输入滤波器和电子可调的中心频率调谐器对齐到天线特性
公开(公告)号：EP1500194A1
公开(公告)日：2005-01-26
申请号：EP03728536.8
申请日：2003-04-25
IPC分类号： H03J1/00
CPC分类号： H04N5/50 , H03J1/0066 , H03J3/185 , H03J3/20 , H03J2200/28 , H04N5/52 , H04N21/4383 , H04N21/44209
摘要： A system, apparatus and/or method provides frequency response adjustment of an RF input filter (208) of an RF tuner (40) based on impedance of an antenna system (24) that is providing reception of RF signals to the RF tuner. The frequency response adjustment is preferably accomplished dynamically and/or with respect to each frequency tuned. Particularly, the system, method and/or apparatus provides compensation at the RF tuner level for mistuning effects produced on the RF tuner (40) by antenna system impedance (29) presented at the antenna input (30) that is other than a designed for impedance. Frequency response of an RF input filter (208, 216) for the RF tuner (40) is electronically adjustable with an independent or semi-independent control voltage signal based on one or more measured parameters of a tuning frequency. Frequency response adjustment may include adjustment of a center frequency of the RF input filter bandpass frequency range and/or altering the bandpass frequency range of the RF input filter. The subject invention expands the capability of an RF signal receiver, particularly one using at least one electronically adjustable RF filter at the input of an electronic alignment type tuner.
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2.发明公开METHOD AND APPARATUS FOR PROVIDING DUAL AUTOMATIC GAIN CONTROL DELAY SETTINGS IN A TELEVISION RECEIVER 有权DEVICE AND METHOD FOR PROVIDING双自动增益控制的延迟设置电视接收机
公开(公告)号：EP1197080A1
公开(公告)日：2002-04-17
申请号：EP00948656.4
申请日：2000-07-13
IPC分类号： H04N5/52
CPC分类号： H04N5/46 , H04N5/4401 , H04N5/52 , H04N21/42638
摘要： The present invention provides a method and apparatus for processing a received television signal comprising one of a first type of television signal and a second type of television signal. Specifically, the method comprises amplifying said received television signal in response to a control signal. If the received television signal comprises the first type of television signal, the RF amplifier gain is reduced when said received television signal exceeds a first signal level. If the received television signal comprises the second type of television signal, the RF amplifier gain is reduced when said received television signal exceeds a second signal level. The second signal level is greater than said first signal level. A concomitant apparatus is also provided. As the first signal level is lower for the first type of television signal, reception of the first type of television signal is improved.
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3.发明授权METHOD AND APPARATUS FOR PROVIDING DUAL AUTOMATIC GAIN CONTROL DELAY SETTINGS IN A TELEVISION RECEIVER 有权DEVICE AND METHOD FOR PROVIDING双自动增益控制的延迟设置电视接收机
公开(公告)号：EP1197080B1
公开(公告)日：2003-09-17
申请号：EP00948656.4
申请日：2000-07-13
IPC分类号： H04N5/52
CPC分类号： H04N5/46 , H04N5/4401 , H04N5/52 , H04N21/42638
摘要： The present invention provides a method and apparatus for processing a received television signal comprising one of a first type of television signal and a second type of television signal. Specifically, the method comprises amplifying said received television signal in response to a control signal. If the received television signal comprises the first type of television signal, the RF amplifier gain is reduced when said received television signal exceeds a first signal level. If the received television signal comprises the second type of television signal, the RF amplifier gain is reduced when said received television signal exceeds a second signal level. The second signal level is greater than said first signal level. A concomitant apparatus is also provided. As the first signal level is lower for the first type of television signal, reception of the first type of television signal is improved.
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公开(公告)号：EP1171998B1
公开(公告)日：2003-09-17
申请号：EP00926211.4
申请日：2000-04-20
CPC分类号： H04N5/4446 , H04N5/4401 , H04N5/46
摘要： An IF signal processing arrangement for processing both analog and digital signals is disclosed in the present application. The signal processing arrangement includes a signal source for providing one of digital and analog IF signals, a first SAW filter having an output for filtering the IF signal, digital signal processing circuitry coupled to the output for processing a filtered digital IF signal, and analog signal processing circuitry coupled to the output for processing which includes filtering a filtered analog signal.
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公开(公告)号：EP1171998A1
公开(公告)日：2002-01-16
申请号：EP00926211.4
申请日：2000-04-20
CPC分类号： H04N5/4446 , H04N5/4401 , H04N5/46
摘要： An IF signal processing arrangement for processing both analog and digital signals is disclosed in the present application. The signal processing arrangement includes a signal source for providing one of digital and analog IF signals, a first SAW filter having an output for filtering the IF signal, digital signal processing circuitry coupled to the output for processing a filtered digital IF signal, and analog signal processing circuitry coupled to the output for processing which includes filtering a filtered analog signal.
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