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公开(公告)号：EP3977156A1
公开(公告)日：2022-04-06
申请号：EP20813343.9
申请日：2020-01-16
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公开(公告)号：EP1959624A4
公开(公告)日：2013-08-21
申请号：EP05811486
申请日：2005-11-30
申请人： FUJITSU LTD
发明人： YAMAZAKI DAISUKE , GOTOH KUNIHIKO
CPC分类号： H04L27/06 , H03D1/22 , H04B1/707 , H04B2201/70715 , H04L25/067
摘要： A technique for modulating an amplitude shift keying (ASK)-modulated signal of which the modulation ratio is small is provided. A modulation ratio enhancement circuit 21 increases the modulation ratio of a current signal which is ASK-modulated with signal data. A branch unit 22, an average value detection unit 23, a comparator 24 and a buffer 25 constitute a demodulation unit so that the signal data is demodulated from a current signal of which the modulation ratio is increased by the modulation ratio enhancement circuit 21.
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公开(公告)号：EP1053590B1
公开(公告)日：2005-03-09
申请号：EP99960786.4
申请日：1999-10-16
申请人： ROBERT BOSCH GMBH
发明人： KRAWINKEL, Bernward
IPC分类号： H03D5/00
CPC分类号： H04B1/18
摘要： The invention relates to an input circuit for an FM/AM radio receiver with an FM intermediate frequency trap circuit (3) and an AM image frequency trap circuit (5) comprising an FM input circuit for receiving frequency-modulated input signals and an AM input circuit for receiving amplitude-modulated input signals in the output of a circuit for remote FM selection on the antenna output. In order to better decouple the FM input circuit from the AM input circuit, an AM image frequency trap circuit (5) is connected behind the FM intermediate frequency trap circuit (3) and PIN diodes (D1, D2) are provided between the FM intermediate frequency trap circuit (3) and the AM image frequency trap circuit (5) for switching from AM to FM mode wherein said PIN diodes (D1, D2) connect the FM intermediate frequency trap circuit (3) for high frequency signals to the ground when the FM mode is selected. In the AM mode, a control voltage is applied on the switching device between the FM intermediate frequency trap circuit (3) and the AM image frequency trap circuit (5) for automatic gain control (AGC).
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公开(公告)号：EP1016209B1
公开(公告)日：2003-06-11
申请号：EP98940409.0
申请日：1998-08-27
申请人： Radioscape Limited
CPC分类号： H03J3/08 , H03J1/0008 , H04B1/16 , H04B1/406 , H04H40/18
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公开(公告)号：EP1053590A1
公开(公告)日：2000-11-22
申请号：EP99960786.4
申请日：1999-10-16
申请人： ROBERT BOSCH GMBH
发明人： KRAWINKEL, Bernward
IPC分类号： H03D5/00
CPC分类号： H04B1/18
摘要： The invention relates to an input circuit for an FM/AM radio receiver with an FM intermediate frequency trap circuit (3) and an AM image frequency trap circuit (5) comprising an FM input circuit for receiving frequency-modulated input signals and an AM input circuit for receiving amplitude-modulated input signals in the output of a circuit for remote FM selection on the antenna output. In order to better decouple the FM input circuit from the AM input circuit, an AM image frequency trap circuit (5) is connected behind the FM intermediate frequency trap circuit (3) and PIN diodes (D1, D2) are provided between the FM intermediate frequency trap circuit (3) and the AM image frequency trap circuit (5) for switching from AM to FM mode wherein said PIN diodes (D1, D2) connect the FM intermediate frequency trap circuit (3) for high frequency signals to the ground when the FM mode is selected. In the AM mode, a control voltage is applied on the switching device between the FM intermediate frequency trap circuit (3) and the AM image frequency trap circuit (5) for automatic gain control (AGC).
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公开(公告)号：EP0570480A4
公开(公告)日：1994-07-06
申请号：EP92905667
申请日：1992-02-04
申请人： MOTOROLA INC
发明人： ECKLUND LAWRENCE M
CPC分类号： H03D3/241 , H03D5/00 , H04B1/1646
摘要： An improved AM-FM combined stereo receiver (100) is provided having a single processor (155) for removing, in the FM mode, arc-tangent distortion, and in the AM mode, to process the phase term from arc-tangent {L - R/1 + L + R} to determine {L - R/1 + L + R}. Further, the radio includes a single discriminator circuit (161, 137, 139) wherein, in the FM mode, the discriminator tank circuit (137, 139) is used to convert frequency deviation to baseband audio and, in the AM mode, the discriminator tank circuit is used as the frequency-determining element for the voltage controlled oscillator (VCO) (161), the VCO being used to translate the intermediate frequency (IF) signal to baseband.
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7.发明公开Signal receiver for terrestrial and satellite broadcastings 失效EmpfängerfürErd- und Satellitenrundfunk。
公开(公告)号：EP0276144A2
公开(公告)日：1988-07-27
申请号：EP88300463.2
申请日：1988-01-20
发明人： Sakashita, Seiji , Ozeki, Hiroaki , Kanno, Ippei
IPC分类号： H03D5/00
CPC分类号： H03D5/00
摘要： A signal receiver which is capable of receiving and demodulating a satellite broadcasting signal which is an FM signal and a terrestrial broadcasting signal which is an AM signal is disclosed. FM and AM signals are frequency-converted into signals having frequencies in a same intermediate frequency band by making common use of a radio frequency amplifier, a mixer, a local oscillator and an intermediate frequency filter. At the time of reception of an FM signal, the FM signal is demodulated in a phase-locked loop circuit, and a local oscillator is subjected to frequency modulation by a part of the demodulated signal, thereby constituting an FM negative feedback loop, and thus narrowing the occupied bandwidth of the FM signal. At the time of reception of an AM signal, the phase-locked loop circuit is used to regenerate a carrier, and the output signal of the phase-locked loop circuit is input to a multiplier to effect synchronous detection of the input signal. At this time, the FM negative feedback to the local oscillator is utilized to effect automatic frequency control, thereby achieving stabilization of the synchronous detection.
摘要翻译： 公开了能够接收和解调作为FM信号的卫星广播信号和作为AM信号的地面广播信号的信号接收机。 通过共同使用射频放大器，混频器，本地振荡器和中频滤波器，FM和AM信号被频率转换成具有相同中频频率的信号。 在接收到FM信号时，FM信号在锁相环电路中被解调，并且本地振荡器被解调信号的一部分进行频率调制，由此构成FM负反馈回路 缩小FM信号的占用带宽。 在接收到AM信号时，使用锁相环电路来再生载波，并且将锁相环电路的输出信号输入到乘法器以进行输入信号的同步检测。 此时，利用本地振荡器的FM负反馈来实现自动频率控制，从而实现同步检测的稳定。
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公开(公告)号：EP0074858B1
公开(公告)日：1987-07-08
申请号：EP82304870.7
申请日：1982-09-15
CPC分类号： H03D3/007 , H03D1/00 , H03D1/24 , H03D3/006 , H03D5/00 , H03D7/165 , H03D2200/0025 , H03D2200/0035 , H03D2200/005 , H03D2200/0052
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公开(公告)号：EP0020744B1
公开(公告)日：1983-07-20
申请号：EP80900178.7
申请日：1979-12-21
CPC分类号： H03D5/00
摘要： The AM-FM detector circuit is of integrated circuit format and comprises as an input stage, a differentially connected emitter follower pair (24, 26) which functions: in FM-mode to pass the more dominant one of two incoming FM-IF signals which are phase-displaced on a continuously variable basis about a 90 phase displacement at the FM-IF carrier frequency, and in AM-mode to operate as a full wave rectifier on two incoming, 180 phase displaced, AM signals. Onward of the input stage there is an FM-channel which includes a zero-crossing detector (33), and an AM-channel which includes a linear differential amplifier (37), and finally an ouput amplifier (41) which delivers, in either FM or AM mode, the recovered audio, and either an FM-AFC or AM-AGC signal. The detector circuit incorporates significant improvements, designed to insure temperature stability, compensation for variations in the IC fabricating process, over-all stability and especially dc-stability, and to provide, in AM-mode improved AGC performance and minimized audio distortion.
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公开(公告)号：EP0015706B1
公开(公告)日：1983-04-13
申请号：EP80300568.5
申请日：1980-02-26
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