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公开(公告)号：EP0492653B1
公开(公告)日：1996-06-19
申请号：EP91122302.2
申请日：1991-12-27
发明人： Kubo, Kazuhiko , Konishi, Takaaki
IPC分类号： H03H7/01
CPC分类号： H03H7/1758 , H03H7/0115 , H03H2001/0078 , H03H2001/0085
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公开(公告)号：EP1158667B1
公开(公告)日：2006-12-20
申请号：EP01111204.2
申请日：2001-05-14
发明人： Azakami, Hiroshi , Konishi, Takaaki , Kato, Hisaya , Tokunaga, Naoya , Ozeki, Hiroaki , Ueda, Kazuya
IPC分类号： H03G3/30
CPC分类号： H03G3/3089
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公开(公告)号：EP0800224A2
公开(公告)日：1997-10-08
申请号：EP97302071.2
申请日：1997-03-26
IPC分类号： H01P1/203
CPC分类号： H01P1/20336
摘要： A receiving apparatus is presented, in which a channel frequency can be selected over a wide band with an increased attenuation at an image frequency and/or at a local oscillation frequency by including a tunable filter having a following construction.
Microstrip lines are connected between either one of the input or the output terminal or both of the input and output terminals of the tunable filter; a plurality of resonant circuits are formed by each of a plurality of coils and a plurality of variable capacitance diodes; and the coils are electromagnetically coupled and where a voltage applied to each cathode of each of a plurality of variable capacitance diodes through each of a plurality of resistors is controlled to tune a frequency to be received.-
公开(公告)号：EP1158667A3
公开(公告)日：2005-07-13
申请号：EP01111204.2
申请日：2001-05-14
发明人： Azakami, Hiroshi , Konishi, Takaaki , Kato, Hisaya , Tokunaga, Naoya , Ozeki, Hiroaki , Ueda, Kazuya
IPC分类号： H03G3/30
CPC分类号： H03G3/3089
摘要： A digital demodulation apparatus is provided for automatically controlling gain based on a state of receiving a digital modulated signal. The digital demodulation apparatus ( DSp ) amplifies a digital modulated signal wave ( Sb ) received through the air with the gain automatically controlled so as to have a predetermined amplitude. In the above apparatus ( DSp ), a receive level variation detector (62) detects receive level variation ( D , C/N) of the received digital signal wave ( Sb ). A gain controller (15, Sac ) controls the gain based on the detected receive level variation ( D, C/N).
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公开(公告)号：EP0810750B1
公开(公告)日：2005-07-13
申请号：EP97303435.8
申请日：1997-05-20
IPC分类号： H04H1/00
CPC分类号： H04H40/18 , H03B5/1203 , H03B5/1231 , H03B5/1243 , H03D3/007 , H03J1/005 , H03L7/18
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公开(公告)号：EP1168605A2
公开(公告)日：2002-01-02
申请号：EP01114768.3
申请日：2001-06-25
发明人： Konishi, Takaaki , Azakami, Hiroshi , Ueda, Kazuya , Tokunaga, Naoya , Kato, Hisaya , Ozeki, Hiroaki
IPC分类号： H03G3/30
摘要： In an automatic gain control amplifier ( AGCa ), an RF automatic gain controller (2) controls the gain of a radio frequency signal ( Srf ). A frequency converter (3, 4) frequency-converts the radio frequency signal ( Srfa ) into an intermediate frequency signal ( Sifa ). An IF automatic gain controller (5) controls the gain of the intermediate frequency ( Sifa ). A level detector ( LDa ) detects a signal level of the gain-controlled intermediate frequency signal ( Sifa ), and generates a level signal ( SLa ). An automatic gain control signal generator (SGa, SGb) separately controls, based the level signal ( SLa, SLb ), the RF automatic gain controller (2) and the IF automatic gain controller (5).
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公开(公告)号：EP1158667A2
公开(公告)日：2001-11-28
申请号：EP01111204.2
申请日：2001-05-14
发明人： Azakami, Hiroshi , Konishi, Takaaki , Kato, Hisaya , Tokunaga, Naoya , Ozeki, Hiroaki , Ueda, Kazuya
IPC分类号： H03G3/30
CPC分类号： H03G3/3089
摘要： A digital demodulation apparatus is provided for automatically controlling gain based on a state of receiving a digital modulated signal.
The digital demodulation apparatus ( DSp ) amplifies a digital modulated signal wave ( Sb ) received through the air with the gain automatically controlled so as to have a predetermined amplitude. In the above apparatus ( DSp ), a receive level variation detector (62) detects receive level variation ( D , C/N) of the received digital signal wave ( Sb ). A gain controller (15, Sac ) controls the gain based on the detected receive level variation ( D, C/N).摘要翻译： 提供一种用于根据接收数字调制信号的状态来自动控制增益的数字解调装置。 数字解调装置（DSp）以自动控制的增益放大通过空气接收的数字调制信号波（Sb），以具有预定的幅度。 在上述装置（DSp）中，接收电平变化检测器（62）检测接收数字信号波（Sb）的接收电平变化（D，C / N）。 增益控制器（15，Sac）基于检测到的接收电平变化（D，C / N）来控制增益。
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公开(公告)号：EP0810750A3
公开(公告)日：1999-08-18
申请号：EP97303435.8
申请日：1997-05-20
IPC分类号： H04H1/00
CPC分类号： H04H40/18 , H03B5/1203 , H03B5/1231 , H03B5/1243 , H03D3/007 , H03J1/005 , H03L7/18
摘要： A digital broadcast receiver for receiving a digital modulation signal of the present invention includes channel selection means inputting a digital modulation signal of a radio frequency band and frequency converting a desired digital modulation signal into a designa'ted intermediate frequency signal; oscillation means for generating a local oscillation signal used for frequency conversion at the channel selection means; oscillation frequency control means for controlling a frequency of the local oscillation signal at the oscillation means; phase noise characteristic control means for improving a phase noise characteristic of the local oscillation signal generated at the oscillation means; filter means for extracting the intermediate frequency signal selected at channel selection means; orthogonal detection means for orthogonally detecting the intermediate frequency signal extracted at the filter means; A/D converter means for converting the analog output of the orthogonal detection means into a digital signal; and digital demodulation means for digitally demodulating the output of the A/D converter means; and makes a high performance digital reception possible which can improve an AFC function by the channel selection means and can improve a bit error rate at the same time.
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公开(公告)号：EP1164788A3
公开(公告)日：2008-10-29
申请号：EP01113523.3
申请日：2001-06-12
IPC分类号： H04N5/44
CPC分类号： H04N5/4446 , H03G3/3068 , H03G3/3089 , H04H40/18 , H04N5/4401 , H04N5/50 , H04N5/52 , H04N21/42607
摘要： In a digital broadcast receiving apparatus for amplifying a received modulated digital signal wave (RF) with automatically adjusted gain and demodulating the modulated signal wave to a digital signal (SDMD), a tuner (2) frequency-converts the modulated digital signal wave (Srf) to generate a first modulated signal (SMA). A first automatic gain control amplification unit (AGC1) controls gain of the tuner (2) to make a level of the first modulated signal ( SMA ) at a first predetermined level. An A/D converter (3) converts the first modulated signal (SMA) into a second modulated signal (SMD). A demodulator (7) demodulates the second modulated signal (SMD) to generate a first demodulated digital signal (SDD). A second automatic gain control amplifier (AGC2a) generates a second demodulated digital signal (SMDa) where frequency fluctuations included in the digital modulated wave (Srf) are eliminated.
摘要翻译： 在用于放大具有自动调整的增益的接收调制数字信号波（RF）并将调制信号波解调为数字信号（SDMD）的数字广播接收装置中，调谐器（2）将调制数字信号波（Srf ）以生成第一调制信号（SMA）。 第一自动增益控制放大单元（AGC1）控制调谐器（2）的增益以使第一调制信号（SMA）的电平处于第一预定电平。 A / D转换器（3）将第一调制信号（SMA）转换为第二调制信号（SMD）。 解调器（7）解调第二调制信号（SMD）以产生第一解调数字信号（SDD）。 第二自动增益控制放大器（AGC2a）产生其中包含在数字调制波（Srf）中的频率波动被消除的第二解调数字信号（SMDa）。
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公开(公告)号：EP1168605A3
公开(公告)日：2004-10-13
申请号：EP01114768.3
申请日：2001-06-25
发明人： Konishi, Takaaki , Azakami, Hiroshi , Ueda, Kazuya , Tokunaga, Naoya , Kato, Hisaya , Ozeki, Hiroaki
IPC分类号： H03G3/30
摘要： In an automatic gain control amplifier ( AGCa ), an RF automatic gain controller (2) controls the gain of a radio frequency signal ( Srf ). A frequency converter (3, 4) frequency-converts the radio frequency signal ( Srfa ) into an intermediate frequency signal ( Sifa ). An IF automatic gain controller (5) controls the gain of the intermediate frequency ( Sifa ). A level detector ( LDa ) detects a signal level of the gain-controlled intermediate frequency signal ( Sifa ), and generates a level signal ( SLa ). An automatic gain control signal generator (SGa, SGb) separately controls, based the level signal ( SLa, SLb ), the RF automatic gain controller (2) and the IF automatic gain controller (5).
摘要翻译： 在自动增益控制放大器（AGCa）中，RF自动增益控制器（2）控制射频信号（Srf）的增益。 变频器（3,4）将射频信号（Srfa）频率转换为中频信号（Sifa）。 IF自动增益控制器（5）控制中频增益（Sifa）。 电平检测器（LDa）检测增益控制中频信号（Sifa）的信号电平，并产生电平信号（SLa）。 自动增益控制信号发生器（SGa，SGb）基于电平信号（SLa，SLb），RF自动增益控制器（2）和IF自动增益控制器（5）分别进行控制。
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