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公开(公告)号：EP1794883A1
公开(公告)日：2007-06-13
申请号：EP05789530.2
申请日：2005-09-26
申请人： Unitron
发明人： DELEU, Stephen
IPC分类号： H03J5/02
CPC分类号： H03J5/0263
摘要： An electronic filter device for the reception of TV-signals, comprising a plurality of frequency determining elements settable by means of an analog setting voltage, a memory (2) for storing digital values representative of the analog setting voltages and conversion circuitry (11- 14) for converting the digital values into the analog setting voltages. The conversion circuitry comprises a first part (11-13) for generating a digitally modulated signal for each digital value, the digitally modulated signal having a modulated characteristic representative of the digital value, and a second part (14) for converting each of the digitally modulated signals into the analog setting voltages.
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公开(公告)号：EP0036335A2
公开(公告)日：1981-09-23
申请号：EP81301154.1
申请日：1981-03-18
发明人： Terami, Koji , Fujimoto, Isao
CPC分类号： H03J5/244 , H03J5/0263
摘要： A station selecting apparatus comprises a preset signal generating circuit in the form of a charging/discharging circuit (23) including a parallel connection of a variable resistor (231) and a capacitor (232) and being adapted to generate a pulsive preset signal having a pulse width determined by the discharging time constant of the charging/discharging circuit (23). A variable reactance device which determines the tuning frequency is controlled in accordance with the pulse width of the preset signal. A semifixed resistor (236) is connected between the variable resistor (231) of the circuit (23) and the ground for the purpose of defining the minimum pulse width of the preset signal and a further semifixed resistor (238) is connected in parallel with the variable resistor (231) for the purpose of defining the maximum pulse width of the preset signal, so that the tuning frequency is limited to a predetermined range.
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公开(公告)号：EP0011646A4
公开(公告)日：1980-06-10
申请号：EP79900135
申请日：1979-08-28
申请人： FUJITSU TEN LTD
发明人： ITO TATSUO
CPC分类号： H03J7/06 , H03J5/0263 , H03J5/246
摘要： An electronically tuned radio receiver adapted for digital selection is provided with circuit means (b9) for detecting that the received frequency is outside a band, and circuits (60, 62, 48, 50) for bringing the received frequency back within the band in response to an output from the circuit means (b9). In changing over bands, these circuits make it possible to avoid the inconvenience of changing the received frequency to a value below the lower frequency limit of a band. Moreover, pulse generator circuits (144, 142) are connected to the strobe terminal G of a multiplexer (46) which changes over selection systems. This circuit is intended to rationalize selection speed.
摘要翻译： 适用于数字选择的电子调谐的无线电接收机配备有用于检测所接收的频率在频带之外的电路装置（b9），以及用于将接收到的频率带回到频带内的电路（60,62,48,50） 到电路装置（b9）的输出。 在转换频段时，这些电路可以避免将接收频率改变为低于频段下限频率值的不便。 此外，脉冲发生器电路（144,142）连接到转换选择系统的多路复用器（46）的选通端子G. 此电路旨在合理选择速度。
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公开(公告)号：EP1794883B2
公开(公告)日：2018-03-21
申请号：EP05789530.2
申请日：2005-09-26
申请人： Unitron
发明人： DELEU, Stephen
IPC分类号： H03J5/02
CPC分类号： H03J5/0263
摘要： An electronic filter device for the reception of TV-signals, comprising a plurality of frequency determining elements settable by means of an analog setting voltage, a memory (2) for storing digital values representative of the analog setting voltages and conversion circuitry (11-14) for converting the digital values into the analog setting voltages. The conversion circuitry comprises a first part (11-13) for generating a digitally modulated signal for each digital value, the digitally modulated signal having a modulated characteristic representative of the digital value, and a second part (14) for converting each of the digitally modulated signals into the analog setting voltages.
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公开(公告)号：EP0050392B1
公开(公告)日：1985-05-22
申请号：EP81201152.6
申请日：1981-10-19
发明人： Kelland, Martin John
CPC分类号： H03J5/0263 , H03J7/06 , H03L7/16
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公开(公告)号：EP0050392A1
公开(公告)日：1982-04-28
申请号：EP81201152.6
申请日：1981-10-19
发明人： Kelland, Martin John
CPC分类号： H03J5/0263 , H03J7/06 , H03L7/16
摘要： An automatic frequency control system comprises frequency measuring means (IFM), which produces a frequency quantity representing the frequency of its input signal, and controllable-frequency signal generating means (VCO), which produces an output signal whose frequency depends on a control signal supplied to its control input. In a normal mode of operation, IFM derives its input signal from an external source connected to an input terminal (T), and the system derives from the frequency quantity produced by IFM a control signal for VCO, using a predetermined transfer characteristic, so that the output frequency of VCO is dependent on the frequency of the input signal to IFM, being for example equal to the frequency of the signal at T. In order that the system may have an accurate and rapid response, said transfer characteristic is predetermined in a calibration mode of operation in which different control signals for VCO are derived from a calibration signal generator (CSG), consequent input signals for IFM are derived from the output of VCO, and different consequent frequency quantities produced by IFM are associated with respective control signals for VCO by storing digital words representing these control signals in a random-access memory (RAM) at respective addresses which are consequent frequency quantities from IFM. The system may be recalibrated at intervals to take account of drifts in the system.
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公开(公告)号：EP0007943A1
公开(公告)日：1980-02-20
申请号：EP78900133
申请日：1979-04-09
申请人： RCA CORP
CPC分类号： H03J5/0263 , G04G15/006
摘要： Un recepteur de television comprend un chassis (12) ayant un syntonisateur numerique (14) pour generer des signaux d'oscillation locaux pour syntoniser le recepteur sur des canaux respectifs en reponse a des signaux binaires representant les numeros des canaux correspondants et une unite de traitement des signaux (18) servant a commander au moins une caracteristique du recepteur, tel que le niveau sonore, en reponse a des signaux binaires representant la caracteristique controlable. Le recepteur comprend egalement un micro-ordinateur (34) ayant une MAS (130) (Memoire a Acces Selectif) avec au moins une adresse de memoire pour stocker des signaux binaires representant le temps present et une pluralite d'adresses de memoire pour stocker des signaux binaires representant des temps futurs, ainsi que des numeros de canaux devant etre syntonises a ces temps. Une partie de la commande (100) du micro-ordinateur relie les signaux binaires representant le numero du canal associe au temps futur au syntonisateur numerique lorsque le temps present correspond au temps futur. Un clavier (32) ayant dix touches a numero pour generer des signaux binaires representant les chiffres decimaux de 0 a 9 et deux touches caracteristiques pour generer des signaux binaires representant une augmentation et une diminution de la caracteristique controlable est prevu pour permettre a l'usager de commander les differents modes de fonctionnement du recepteur. Lorsqu'un usager actionne les touches a numero pour former un numero faisant partie d'une gamme predeterminee de numeros de canaux, par exemple, 2-83, la partie de commande du micro-ordinateur provoque la syntonisation d'un canal. Par la suite, en operant les touches a numero pour former un numero inclus dans une gamme predeterminee de numeros de canaux, le canal change, de meme que l'operation des touches de la caracteristique provoque le changement de la caracteristique controlable. Lorsqu'un usager opere les touches a numero pour former un numero ne faisant pas partie de la gamme
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公开(公告)号：EP1538831A1
公开(公告)日：2005-06-08
申请号：EP04028144.6
申请日：2004-11-26
IPC分类号： H04N5/44
CPC分类号： H03J5/0245 , H03J1/0041 , H03J5/0263 , H03J5/0281 , H03J7/026 , H04N5/44 , H04N5/50 , H04N21/4263 , H04N21/4384
摘要： It is an object of the invention to provide a channel selecting unit capable of implementing a channel selecting operation accurately in a short time with a simple circuit configuration. AFT voltages from a tuner 10 of a picture recording and playback portion 1 and a tuner 20 of a receiver portion 2 are detected by an AFT voltage detecting portion 30, while a synchronous signal separated at a video information processing portion 13 of the picture recording and playback portion 1 is counted by a pulse counter 31 and the presence or absence of synchronization is detected by a synchronization detecting potion 33. A channel selecting portion 32 transmits a tuning instruction signal to the tuner 10 and allows tuning frequency data f 1 and an AFT voltage value V 0 , at the time when synchronization was detected, to be stored in a storage portion 4, thereby implementing the channel selecting operation based on stored data at the time of channel select processing of the tuner 20.
摘要翻译： 本发明的目的是提供一种能够以简单的电路配置在短时间内精确地实现频道选择操作的频道选择单元。 来自图像记录和再现部分1的调谐器10和接收机部分2的调谐器20的AFT电压由AFT电压检测部分30检测，而在图像记录的视频信息处理部分13分离的同步信号和 重放部分1被脉冲计数器31计数，并且由同步检测部分33检测是否存在同步。信道选择部分32向调谐器10发送调谐指令信号，并且允许调谐频率数据f1和AFT电压 在检测到同步时的值V0被存储在存储部分4中，从而在调谐器20的频道选择处理时基于存储的数据实现频道选择操作。
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9.发明公开
公开(公告)号：EP0615670A1
公开(公告)日：1994-09-21
申请号：EP93921879.0
申请日：1993-09-29
申请人： BECKER GMBH
发明人： KLOS, Rainer
IPC分类号： H03J5
CPC分类号： H03J5/0263
摘要： Afin de syntoniser un récepteur radiophonique au moyen de touches associés à des stations, un nombre déterminé de fréquences d'émission est premièrement enregistré sous chaque touche associée à une station dans un ordre prédéterminé. Lorsque l'on actionne la touche associée à la station pendant une durée minimum prédéterminée, la fréquence d'émission réellement réglée est inscrite dans la première zone de mémoire. On inscrit ensuite la fréquence d'émission de la station émettrice que l'on vient de syntoniser dans la zone suivante de mémoire en actionnant encore une fois la même touche associée à la station pendant la durée minimum prédéterminée. On répète ce processus jusqu'à ce que toutes les zones de mémoire de la touche associée à la station soient occupées. On syntonise successivement dans l'ordre prédéterminé les fréquences d'émission émettrice enregistrées sous une touche associée à une station en actionnant plusieurs fois ladite touche.
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公开(公告)号：EP0273046A4
公开(公告)日：1990-09-26
申请号：EP87903806
申请日：1987-05-29
CPC分类号： H04N21/812 , H03J1/0091 , H03J5/0263 , H04N7/162
摘要： A fast tuning subsystem includes a tuner (24A, 24B) for selecting a channel, with a voltage controlled oscillator for determining the channel frequency the tuner selectively receives. A predictor supplies a selected predicted voltage signal from memory (56) to the oscillator to slew the channel frequency at a rapid slew rate to the frequency corresponding to the selected predicted voltage signal. An error detector (26) generates a tuning error signal indicative of the tuning error of the tuner off the frequency for the selected channel. The tuning error signal is combined (76) with the selected predicted voltage signal to provide a control signal for adjusting the channel frequency to reduce the tuning error. This feedback provides successively a relatively fast correction mode and a relatively slow station-keeping mode. The tuning subsystem automatically and from time to time updates the signals stored in the memory for respective channels.
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