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公开(公告)号：EP1383248A2
公开(公告)日：2004-01-21
申请号：EP03101604.1
申请日：2003-06-03
IPC分类号： H04B1/28
CPC分类号： H04B1/28
摘要： A single conversion tuner is provided for receiving digital terrestrial broadcast signals. The tuner comprises a single frequency changer comprising a mixer (4) and local oscillator (7) controlled by a PLL synthesiser (6). A non-alignable variable low pass filter (3) is provided between the tuner input and the mixer (4), which is of the image reject type. The bandwidth of the filter (3) is varied so as to track the local oscillator frequency to provide sufficient attenuation of the image channel without requiring any alignment during manufacture.
摘要翻译： 提供用于接收数字地面广播信号的单个转换调谐器。 调谐器包括单个变频器，其包括由PLL合成器（6）控制的混频器（4）和本地振荡器（7）。 在调谐器输入和混合器（4）之间提供不可校正的可变低通滤波器（3），该混频器具有图像拒绝型。 改变滤波器（3）的带宽，以便跟踪本地振荡器频率，以在制造期间不需要任何对准，来提供图像通道的足够的衰减。
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公开(公告)号：EP1383248A3
公开(公告)日：2005-01-26
申请号：EP03101604.1
申请日：2003-06-03
IPC分类号： H04B1/28
CPC分类号： H04B1/28
摘要： A single conversion tuner is provided for receiving digital terrestrial broadcast signals. The tuner comprises a single frequency changer comprising a mixer (4) and local oscillator (7) controlled by a PLL synthesiser (6). A non-alignable variable low pass filter (3) is provided between the tuner input and the mixer (4), which is of the image reject type. The bandwidth of the filter (3) is varied so as to track the local oscillator frequency to provide sufficient attenuation of the image channel without requiring any alignment during manufacture.
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