CN1120570C - 可调谐接收机 - Google Patents

可调谐接收机 Download PDF

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CN1120570C
CN1120570C CN99802764A CN99802764A CN1120570C CN 1120570 C CN1120570 C CN 1120570C CN 99802764 A CN99802764 A CN 99802764A CN 99802764 A CN99802764 A CN 99802764A CN 1120570 C CN1120570 C CN 1120570C
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channel
receiver
frequency
tuned
signal
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CN1290425A (zh
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J·O·萨罗
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Koninklijke Philips NV
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    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02Automatic frequency control
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/06Driving or adjusting arrangements; combined with other driving or adjusting arrangements, e.g. of gain control
    • H03J1/14Special arrangements for fine and coarse tuning
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/44Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/4446IF amplifier circuits specially adapted for B&W TV
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/44Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50Tuning indicators; Automatic tuning control

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Circuits Of Receivers In General (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

接收机(REC)通过信道选择命令(CSC)可调谐(TUN)到许多信道中(CH)的任何一个信道。该接收机调谐到(SRCH)具有识别信道(CH[i])的信道识别(CHIND)的信号(S)的信道(CH[i])。该接收机根据信道识别(CHIND)和用以调谐到这一信道(CH[i])的信道选择命令(CSC[j])来确定(DEF)调谐基准(REF)。这可以降低成本,因为接收机无需依赖于调谐部件的准确性、以便确定哪一个信道选择命令必须用来调谐到特定的信道。

Description

可调谐接收机
本发明涉及通过信道选择命令可调谐到许多信道中的任何一个信道的接收机。本发明可应用于(例如)移动式电话机,它基于将频带划分为多个信道的标准进行工作。
LS-A-5551235描述了一种接收机,它是包括发射机的蜂窝电话收发信机的一部分。接收机包含本地振荡器,归结到实际上,它以25kHz增量从1031MHz变化到1064MHz以便对具有25kHz带宽的信道的基站进行搜索。
合成器控制本振频率。合成器包括基准振荡器。M分频分频器连接到基准振荡器的输出端,而N分频分频器连接到本地振荡器的输出端。基准频率被M分频,而本振频率被N分频,N和M两者都是可编程的以至于它们可以变化。频率比较器比较分频器的输出信号。比较的结果是误差信号,它驱动本地振荡器的调谐端口。为了调整本振频率,N分频分频器被改变直到其输出频率基本上等于M分频分频器的输出频率。
基准振荡器是频率发生系统的基准,并且是(例如)2.5ppm(百万分之几)的振荡器。如果基准振荡器偏离2.5ppm,那么本地振荡器将偏离2.5ppm。通过减小中频(IF)滤波器和/或其它滤波器的带宽,基准振荡器的容差可以显著地放宽到10ppm。
本发明的目的是可以降低成本。
本发明考虑下列方面。通过信道选择命令可调谐到许多信道中的任何一个信道的接收机最好应当提供下面的确定性。必须用哪一个信道选择命令来将接收机调谐到特定的信道,这点是确定的。如果接收机不提供这一确定性,通常需要用各种信道选择命令,直到接收机调谐到所需信道。这是耗时的。而且,必须检测接收机调谐到所需信道。这可能也是耗时的或者更糟糕的是,对一个或多个信道来说甚至是不可能的。
先有技术接收机提供上述的确定性。信道选择命令可认为是N分频分频器的各种N值。合成器实际上将N分频分频器的N值转换成确定接收机被调谐信道的本振频率。本振频率存在误差,它实际上等于基准振荡器的频率误差。已经提到过基准振荡器的误差从2.5ppm(百万分率)放宽到10ppm,而归结到实际上,本振频率以25kHz的增量从1031MHz变化到1064MHz。这通过对具有25kHz带宽信道的基站进行搜索来完成。1000MHz频率的10ppm误差等于10kHz的误差。因此本振频率的误差在信道带宽之内。这样,必须向N分频分频器提供哪一个N值才能够把先有技术接收机调谐到特定的信道,这点是确定的。
按照本发明,通过信道选择命令可调谐到许多信道中的任何一个信道的接收机执行如下步骤。接收机调谐到具有识别信道的信道识别的信号的某信道。接收机根据信道识别和用于调谐到这一信道的信道选择命令来确定调谐基准。
上述步骤可提供这样的确定性:必须使用哪一个信道选择命令将接收机调谐到特定信道。因此按照本发明,接收机无需依赖于诸如基准振荡器这样的调谐部件的准确性,以提供这一确定性。这样,本发明可使用低精度调谐部件,它通常比高精度调谐部件便宜。因此本发明可降低成本。
通过并参考下文中作为非限制性例子描述的附图,本发明及附加特征(它们可有选择地用来实现本发明的优点)是明显的并被阐明。
图1是说明作为权利要求1要求的本发明基本特征的概念图。
图2是说明按照本发明的移动式电话接收机的例子的方框图。
图3是说明按照图2中说明的移动式电话接收机可能工作的方法的流程图。
首先,对参考字符的使用作出一些说明。全部附图用同一字母代号来表示各相似的实体。在单个附图中可能示出各个相似的实体。在那种情况下,数字被加到字母代号中以便区别彼此相似的实体。如果相似的实体号码是运行参数则数字将括在括号中。在说明书和权利要求书中,任何参考符号数可以在适当的地方省略。
图1说明本发明的基本特征。接收机REC通过信道选择命令CSC可调谐TUN到许多信道CH中的任何一个信道。在步骤SRCH,接收机调谐到具有识别信道的信道识别CHIND的信号S的信道CH[i]。在步骤DEF,接收机根据信道识别CHIND和用于调谐到这一信道CH[i]的信道选择命令CSC[j]来确定调谐基准REF。
图1中说明的特征可以用于(例如)按照将频带分成许多信道的标准工作的移动式电话机。被称为AMPS和NAMPS的移动电话标准定义了800MHz频带中30kHz宽的信道。被称为TACS和ETACS的移动电话标准定义了900MHz频带中25kHz宽的信道。这些信道中的某些信道是控制信道,用于传输包括附加信息的控制信息。附加信息包含本地控制信息,它可以包含由上面提及的被传送的信息来识别信道号的二进制字。例如在AMPS中,从834.36到835.65Mhz频率范围的信道号312到355专用于传输控制信息。
再体验一下图1中说明的特征,图2说明按照本发明的移动电话接收机的例子。该移动电话接收机适合于接收来自按照AMPS、NAMPS、TACS或ETACS标准工作的基站的无线电信号RF。该移动电话接收机包含下列主要功能单元:高频混频器RFMIX、中频检测器IFDET、控制器CON、存储器MEM、数模转换器DAC、基准振荡器RFO和合成器SYN。
图2中说明的移动电话接收机基本上工作如下。高频混频器RFMIX将位于特定信道的无线电信号RF转换中频信号IF。任何位于另一信道的无线电信号都被抑制。这样,高频混频器RFMIX实际上选择了一个信道。混合频率Fmix确定哪一个信道被选。
中频检测器IFDET从中频信号IF导出基带信号BB。它还提供指示无线电信号RF强度的电平指示LEV。控制器CON对包含在基带信号BB中的信息进行识别和解码。控制器CON提供基准频率调整值RFA和信道选择值N,N是整数。数模转换器DAC将基准频率调整值RFA转换成控制电压VC。基准频率振荡器RFO提供基准频率Fref,它作为控制电压VC的函数而变化。
合成器SYN根据基准频率Fref和信道选择值N提供来提供混合频率Fmix。混合频率Fmix是基准频率Fref乘以N再除以M,M是整数。M分频的基准频率Fref确定了固定频率的步长,即30kHz用于AMPS/NAMPS而25kHz用于TACS/ETACS。这样,如果信道选择值N逐1增加或减少,混合频率Fmix将按信道带宽30kHz或25kHz增加或减少。因此,通过逐1改变整数N,图2说明的移动电话接收机将一个信道一个信道地调谐。
图3说明图2中说明的移动电话接收机可能工作的方法。该方法总共包含三个阶段:控制信道搜索阶段SRCH、基准设置阶段REFS和信道选择阶段CHSEL。在控制搜索阶段SRCH,移动电话接收机搜索传送最强信号的控制信道。在基准设置阶段REFS,移动电话接收机从那个信号中导出信道号CH#。在信道选择阶段CHSEL,移动电话接收机使用这一信道号和用以调谐到所述控制信道的信道选择值,作为调谐到所需信道号CH#des的基准。
控制信道搜索阶段SRCH包含五个步骤S1-S5。在步骤S1,最大电平LEVmax被赋予零的初始值。此外,信道选择值N和基准频率调整RFA值被赋予启动值:N=Nstart和RFA=RFAstart。因此,移动电话接收机将调谐到其号可能尚不确切知道的某个信道。启动值Nstart的取值最好使得移动电话接收机调谐到频率范围的较低边界处,控制信道处在该位置。
在步骤S2,控制器CON检查移动电话接收机所调谐到的信道的电平指示LEV是否超过了最大电平LEVmax。如果是的话,执行步骤S3。如果不是的话,绕过步骤S3而直接执行S4。在步骤S3,控制器使最大电平LEVmax等于电平指示LEV。而且,它使得基准信道选择值Nref等于使用的信道选择值N:N=Nref。控制器将基准信道选择值Nref存储在存储器MEM中。
在步骤4,控制器CON检查信道选择值N是否等于结束值:N=Nend?结束值Nend的取值最好使得移动电话接收机调谐到频率范围的较高边界处,控制信道处在该位置。如果还没有达到结束值Nend,信道选择值N在步骤S5增加1:步骤S5中的INC[N]。因此,移动电话接收机将调谐到下一个控制信道。随后,对那个控制信道执行步骤S2-S4。如果信道选择值N等于结束值N=Nend,移动电话接收机将从控制信道搜索阶段SRCH进入基准设置阶段REFS。
基准设置阶段REFS包含五个步骤S6-S10。在步骤S6,控制器CON使得信道选择值N等于基准信道选择值N=Nref。因此,移动电话接收机将调谐到具有最强信号的控制信道。在步骤S7,控制器检查基带信号BB是否包含有效的数据:DATA?如果没有,在步骤S8中,控制器CON将基准频率调整值RFA增加1并重新执行步骤S7。如果基带信号BB包含有效数据,则执行步骤S9。在步骤S9中,控制器从包含前面提到的附加信息的基带信号RB中导出信道号CH#。在步骤SI0,控制器CON将信道号CH#作为基准信道号CH#ref存储在存储器MEM中。
信道选择阶段CHSEL包含步骤S11。在步骤S11中,控制器CON计算信道选择值N以便调谐到具有信道号CH#des的所需信道。信道选择值N是所需信道号CH#des减基准信道号CH#ref加基准信道选择值Nref。这样,基准信道号CH#ref和基准信道选择值Nref结合,用作为调谐基准。这个调谐基准提供这样的确定性:当赋予信道选择值N时,移动电话接收机将调谐到所需信道。
上文中的附图及其描述说明了而不是限制了本发明。显然在不超出从属权利要求范围情况下存在许多改变。在这方面,作出如下结束说明。
存在许多在各个单元物理扩展功能和功能元件的方式。在这方面,附图是非常概略的,每一个仅代表本发明的一个可能的实施例。这样,尽管附图示出作为不同单元的不同功能元件,这并不排除:某些功能元件、或所有功能元件可以用作为单个物理单元。权利要求中的任何参考符号不应解释为对权利要求的限制。

Claims (5)

1.一种通过信道选择命令(CSC)可调谐(TUN)到许多信道(CH)中的任何一个信道的接收机(REC),
其特征在于所述接收机包括:
根据具有识别一个信道(CH[i])的信道识别符(CHIND)的信号(S)将所述接收机调谐到(SRCH)所述信道(CH[i])的第一装置,及
根据所述信道识别符(CHIND)和用以调谐到这一信道(CH[i])的信道选择命令(CSC[j])来确定(DEF)调谐基准(REF)的第二装置。
2.权利要求1要求的接收机,其特征在于:所述第一装置在整个控制信道所在的频率范围执行所述调谐。
3.权利要求1要求的接收机,其特征在于:所述第一装置包含选择最强信号以确定调谐基准的第三装置。
4.一种控制通过信道选择命令(CSC)可调谐(TUN)到许多信道(CH)中的任何一个信道的接收机(REC)的方法,
其特征在于所述方法包含如下步骤:
调谐到(SRCH)具有识别所述信道(CH[i])的信道识别符(CHIND)的信号(S)的信道(CH[i]),及
根据所述信道识别(CHIND)和用以调谐到这一信道(CH[i])的信道选择命令(CSC[j])来确定(DEF)调谐基准(REF)。
5.操作包含许多可发送信号的信道(CH)的移动电话系统的方法,所述方法包含发送信号(S)的步骤,其中该信号(S)具有识别发送所述信号的信道(CH[i])的信道识别符(CHIND)。
CN99802764A 1998-12-08 1999-11-24 可调谐接收机 Expired - Fee Related CN1120570C (zh)

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KR100693190B1 (ko) 2007-03-13
DE69930161D1 (de) 2006-04-27
CN1290425A (zh) 2001-04-04
EP1053594A1 (en) 2000-11-22
KR20010040706A (ko) 2001-05-15
EP1053594B1 (en) 2006-03-01
WO2000035088A1 (en) 2000-06-15
JP2002532935A (ja) 2002-10-02
US6748198B1 (en) 2004-06-08
DE69930161T2 (de) 2006-11-23

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