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公开(公告)号：US3105117A
公开(公告)日：1963-09-24
申请号：US5030160
申请日：1960-08-17
申请人： LOEWE OPTA AG
发明人： EGON FRANK
IPC分类号： H04B1/16
CPC分类号： H04B1/1653
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公开(公告)号：US09356717B1
公开(公告)日：2016-05-31
申请号：US14664915
申请日：2015-03-23
申请人： Beken Corporation
发明人： Yiming Huang , Weifeng Wang
CPC分类号： H04H40/36 , H04B1/0003 , H04B1/1653 , H04H40/27
摘要： A device for selecting a channel comprises a speed detector configured to detect a speed of a channel selecting mechanism; a controller connected to the speed detector; and a frequency deviation detector connected to the controller and is configured to receive an input signal. The controller selects a wideband channel searching mode for the frequency deviation detector if the speed is higher than a speed threshold, or a narrowband channel searching mode if the speed is lower than the speed threshold. The frequency deviation detector detects an existence of a channel when either an actual frequency deviation of the input signal is lower than a first wideband frequency deviation threshold when the wideband channel searching mode is selected, or the actual frequency deviation is lower than a narrowband frequency deviation threshold when the narrowband channel searching mode is selected.
摘要翻译： 用于选择频道的装置包括：速度检测器，被配置为检测频道选择机构的速度; 连接到速度检测器的控制器; 以及连接到所述控制器并被配置为接收输入信号的频率偏差检测器。 如果速度高于速度阈值，则控制器选择频偏检测器的宽带信道搜索模式，如果速度低于速度阈值，则选择窄带信道搜索模式。 当选择宽带信道搜索模式时，当输入信号的实际频率偏差低于第一宽带频率偏差阈值时，频率偏差检测器检测信道的存在，或者实际频率偏差低于窄带频率偏差 选择窄带频道搜索模式时的阈值。
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63.发明授权System and method for detecting rated maximum system deviation (RMSD) and alleviating RMSD mismatch 有权用于检测额定最大系统偏差（RMSD）和减轻RMSD失配的系统和方法公开(公告)号：US09356638B1
公开(公告)日：2016-05-31
申请号：US13618082
申请日：2012-09-14
CPC分类号： H04B1/1653 , H04B1/1646 , H04H40/45 , H04H40/72 , H04H40/81 , H04R29/00 , H04S7/301
摘要： An FM audio receiver can include a mono/stereo detector that causes the audio receiver to output either a monophonic or a stereophonic signal based on a received pilot tone energy. An accurate operation of the receiver, including but not limited to correct decoding of monophonic/stereophonic reception, can be based on the receiver operating with the same rated maximum system deviation (RMSD) as the received signal itself. Aspects of the disclosure describe a system and method of detecting and matching a receiver's RMSD to that of a received signal by demodulating a carrier bearing a an input signal over a first bandwidth, extracting a pilot energy signal from the input signal, and demodulating the carrier bearing the input signal over a second bandwidth if the pilot energy signal is within a pilot energy range for a first predetermined amount of time.
摘要翻译： FM音频接收器可以包括单声道/立体声检测器，其使得音频接收器基于接收到的导频音能量输出单声道或立体声信号。 接收机的精确操作，包括但不限于单声道/立体声接收的正确解码，可以基于接收器以与接收信号本身相同的额定最大系统偏差（RMSD）来操作。 本公开的方面描述了通过在第一带宽上解调承载输入信号的载波来检测和接收接收机的RMSD与接收信号的RMSD相匹配的系统和方法，从输入信号中提取导频能量信号，并解调载波 如果导频能量信号在第一预定时间量内的导频能量范围内，则承载输入信号在第二带宽上。
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公开(公告)号：US08774416B2
公开(公告)日：2014-07-08
申请号：US10535060
申请日：2003-10-27
CPC分类号： H04B1/1653 , H04H40/45
摘要： The invention refers to a method for a receiver (1) having a signal path (3) incorporating a tuner (4), a frequency demodulator circuit (5) for supplying an analog stereo multiplex signal comprising a baseband stereo sum signal, a 19 kHz stereo pilot and a stereo difference signal, which is double sideband amplitude-modulated on a suppressed 38 kHz subcarrier, a sampler (6) for converting the analog stereo multiplex signal into a time discrete digital stereo multiplex signal and a stereo decoder (7) for decoding the time discrete digital stereo multiplex signal into a time-discrete digital stereo sum and a time discrete digital stereo difference signal. According to the invention the analog stereo multiplex signal is converted into a time discrete digital stereo multiplex signal and then the time discrete digital stereo multiplex signal is shifted over a frequency of 19 kHz to extract the pilot tone.
摘要翻译： 本发明涉及一种具有包括调谐器（4）的信号路径（3）的接收机（1）的方法，用于提供模拟立体声多路复用信号的频率解调器电路（5），该模拟立体声多路复用信号包括基带立体声和信号，19kHz 立体声导频和立体声差分信号，其是在抑制的38kHz子载波上进行幅度调制的双边带，用于将模拟立体声多路复用信号转换为时间离散数字立体声多路复用信号的采样器（6）和用于 将时间离散数字立体声多路复用信号解码为时间离散数字立体声和时间离散数字立体声差分信号。 根据本发明，模拟立体声多路复用信号被转换成时间离散数字立体声多路复用信号，然后时间离散数字立体声多路复用信号在19kHz的频率上移位以提取导频音。
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公开(公告)号：US08315568B1
公开(公告)日：2012-11-20
申请号：US13345650
申请日：2012-01-06
IPC分类号： H04B1/16
CPC分类号： H04L27/2334 , H04B1/1653 , H04H20/34 , H04H40/18 , H04H2201/13
摘要： Methods and apparatus are provided for receiving a first signal and generating an output signal indicative of radio data system (“RDS”) information. A receiver circuit of the invention can include mixer circuitry, lowpass filter circuitry, downsampler circuitry, and decoder circuitry. Advantageously, the receiver circuit can operate entirely within the digital domain, promoting interoperability with digital frequency modulation (“FM”) demodulator circuitry.
摘要翻译： 提供了用于接收第一信号并产生指示无线电数据系统（RDS）信息的输出信号的方法和装置。 本发明的接收机电路可以包括混频器电路，低通滤波器电路，下采样器电路和解码器电路。 有利地，接收器电路可以完全在数字域内操作，促进与数字频率调制（FM）解调器电路的互操作性。
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66.发明授权System and method for detecting rated maximum system deviation (RMSD) and alleviating RMSD mismatch 有权用于检测额定最大系统偏差（RMSD）和减轻RMSD失配的系统和方法公开(公告)号：US08295495B1
公开(公告)日：2012-10-23
申请号：US11871773
申请日：2007-10-12
IPC分类号： H04H40/81 , H04H20/47 , H04H20/88 , H04H40/36 , H04H40/54 , H04H40/72 , H04B1/10 , H04B1/06 , H04B7/00 , H04B1/16
CPC分类号： H04B1/1653 , H04B1/1646 , H04H40/45 , H04H40/72 , H04H40/81 , H04R29/00 , H04S7/301
摘要： An FM audio receiver can include a mono/stereo detector that causes the audio receiver to output either a monophonic or a stereophonic signal based on a received pilot tone energy. An accurate operation of the receiver, including but not limited to correct decoding of monophonic/stereophonic reception, can be based on the receiver operating with the same rated maximum system deviation (RMSD) as the received signal itself. Aspects of the disclosure describe a system and method of detecting and matching a receiver's RMSD to that of a received signal by demodulating a carrier bearing a an input signal over a first bandwidth, extracting a pilot energy signal from the input signal, and demodulating the carrier bearing the input signal over a second bandwidth if the pilot energy signal is within a pilot energy range for a first predetermined amount of time.
摘要翻译： FM音频接收器可以包括单声道/立体声检测器，其使得音频接收器基于接收到的导频音能量输出单声道或立体声信号。 接收机的精确操作，包括但不限于单声道/立体声接收的正确解码，可以基于接收器以与接收信号本身相同的额定最大系统偏差（RMSD）来操作。 本公开的方面描述了通过在第一带宽上解调承载输入信号的载波来检测和接收接收机的RMSD与接收信号的RMSD相匹配的系统和方法，从输入信号中提取导频能量信号，并解调载波 如果导频能量信号在第一预定时间量内的导频能量范围内，则承载输入信号在第二带宽上。
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67.发明授权System and method for estimating channel condition based on filtered pilot energy signal 有权基于滤波导频能量信号估计信道条件的系统和方法公开(公告)号：US08139772B1
公开(公告)日：2012-03-20
申请号：US11871777
申请日：2007-10-12
CPC分类号： H04B1/1653 , H04B1/1646 , H04H40/45 , H04H40/72 , H04H40/81 , H04R29/00 , H04S7/301
摘要： A receiver may estimate a channel condition based on a difference between a pilot energy signal and a filtered pilot energy signal. The receiver may further switch to a stereophonic mode when both the difference and an energy level of the pilot energy signal satisfy a predetermined requirement of the receiver, and switch to a monophonic mode when either the difference or the energy level of the pilot energy signal fail to satisfy the predetermined requirement of the receiver.
摘要翻译： 接收机可以基于导频能量信号和滤波的导频能量信号之间的差来估计信道状况。 当导频能量信号的差异和能量水平都满足接收机的预定要求时，接收机可以进一步切换到立体声模式，并且当导频能量信号的差值或能量级别失败时，接收机可以切换到单声道模式 以满足接收机的预定要求。
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公开(公告)号：US08064858B1
公开(公告)日：2011-11-22
申请号：US12916335
申请日：2010-10-29
申请人： Hui-Ling Lou
发明人： Hui-Ling Lou
IPC分类号： H04B1/16
CPC分类号： H04B1/1653
摘要： Systems and techniques for processing signals include, in at least one aspect, a method including: receiving an input signal having an associated carrier frequency; multiplying the input signal to produce a multiplied signal; filtering the multiplied signal to produce a high frequency component of the multiplied signal; delaying the multiplied signal to produce a delayed signal; and combining the high frequency component of the multiplied signal with the delayed signal to produce a scaling factor for use in detecting at least one of multiple signal bitstreams associated with the input signal.
摘要翻译： 用于处理信号的系统和技术在至少一个方面包括一种方法，包括：接收具有相关联载波频率的输入信号; 将输入信号相乘以产生相乘的信号; 对乘法信号进行滤波以产生相乘信号的高频分量; 延迟相乘的信号以产生延迟的信号; 以及将所述相乘的信号的高频分量与所述延迟信号组合以产生用于检测与所述输入信号相关联的多个信号比特流中的至少一个的缩放因子。
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公开(公告)号：US07587170B1
公开(公告)日：2009-09-08
申请号：US11488437
申请日：2006-07-17
IPC分类号： H04B1/16
CPC分类号： H04L27/2334 , H04B1/1653 , H04H20/34 , H04H40/18 , H04H2201/13
摘要： Methods and apparatus are provided for receiving a first signal and generating an output signal indicative of radio data system (“RDS”) information. A receiver circuit of the invention can include mixer circuitry, lowpass filter circuitry, downsampler circuitry, and decoder circuitry. Advantageously, the receiver circuit can operate entirely within the digital domain, promoting interoperability with digital frequency modulation (“FM”) demodulator circuitry.
摘要翻译： 提供了用于接收第一信号并产生指示无线电数据系统（“RDS”）信息的输出信号的方法和装置。 本发明的接收机电路可以包括混频器电路，低通滤波器电路，下采样器电路和解码器电路。 有利地，接收器电路可以完全在数字域内操作，促进与数字频率调制（“FM”）解调器电路的互操作性。
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70.发明申请Pilot signal detection circuit and semiconductor integrated circuit equipping the circuit 审中-公开导频信号检测电路和半导体集成电路配备电路公开(公告)号：US20070170946A1
公开(公告)日：2007-07-26
申请号：US10591880
申请日：2005-02-22
申请人： Masaaki Kato , Hiroshi Miyagi
发明人： Masaaki Kato , Hiroshi Miyagi
IPC分类号： G01R31/26
CPC分类号： H04B1/1653 , H03F3/189 , H03F3/45192 , H03F3/45753 , H03F2203/45212 , H03F2203/45424 , H03F2203/45521
摘要： The purpose of the present invention is to improve a detection accuracy of a pilot signal detection circuit. A pilot detection signal voltage is input to a differential amplifier circuit 16 and a reference voltage generated by a reference signal generation circuit 17 is input to a differential amplifier circuit 19. A pilot signal is compared with the reference voltage by the differential amplifier circuits 16 and 19. Output currents of the differential amplifier circuits 16 and 19 are converted into voltages by a current-to-voltage conversion circuit 21. And an input to the current-to-voltage conversion circuit 21 is fed back with a voltage proportionate with an offset voltage of the circuit and the offset voltage of the pilot signal detection circuit is cancelled.
摘要翻译： 本发明的目的是提高导频信号检测电路的检测精度。 导频检测信号电压被输入到差分放大电路16，由参考信号发生电路17产生的参考电压被输入到差分放大电路19.导频信号与差分放大电路16和 19。 差分放大电路16和19的输出电流由电流 - 电压转换电路21转换成电压。 并且，向电流 - 电压转换电路21的输入端以与电路的偏移电压成比例的电压反馈，导频信号检测电路的偏移电压被取消。
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