公开(公告)号：US20080030271A1

公开(公告)日：2008-02-07

申请号：US11630842

申请日：2005-06-08

申请人： Takashi Aoyama ,  Hiroshi Miyagi

发明人： Takashi Aoyama ,  Hiroshi Miyagi

IPC分类号： H03F3/45

CPC分类号： H04B1/1646 ,  H04H40/63

摘要： A stereophonic separation can be adjusted without narrowing the dynamic range. Between the sources of a MOS transistor (Q5), to which a composite signal is inputted, and a MOS transistor (Q6), to which a reference voltage is inputted, there are connected in parallel the series connections of resistors and switch elements (R1) and (SW1), (R2) and (SW2), (R3) and (SW3), and so on. The separation level can be so adjusted in DC operations that the resistors (R1 to R5) may exert no influence on the output voltage of the MOS transistor (Q5), and in AC operations that the values of the parallel resistors (R1 to R5) may be varied.

摘要翻译： 可以调节立体声分离而不使动态范围变窄。 在输入了复合信号的MOS晶体管（Q5）的源极和输入了参考电压的MOS晶体管（Q 6）之间并联连接有电阻器和开关元件的串联连接 （R 1）和（SW 1），（R 2）和（SW 2），（R 3）和（SW 3）等。 电阻（R 1〜R 5）对MOS晶体管（Q 5）的输出电压不产生影响的DC动作中的分离电平可以调整，在并联电阻（R 1〜R 5）可以变化。

公开(公告)号：US5661810A

公开(公告)日：1997-08-26

申请号：US522314

申请日：1995-08-25

申请人： Djahanyar Chahabadi ,  Matthias Herrmann ,  Lothar Vogt ,  Jurgen Kaesser

发明人： Djahanyar Chahabadi ,  Matthias Herrmann ,  Lothar Vogt ,  Jurgen Kaesser

IPC分类号： H03H17/04 ,  H03H17/02 ,  H04B1/10 ,  H04B1/16 ,  H04B1/26 ,  H04B1/64 ,  H04H1/00 ,  H04H20/57 ,  H04H40/63 ,  H04H40/72 ,  H04H5/00

CPC分类号： H04H40/63 ,  H04H40/72 ,  H04H20/57

摘要： The circuit arrangement includes a first low-pass filter (2) for filtering an input signal (H3) proportional to the strength of a received radio signal; a second low-pass filter (3) for filtering the input signal (H3); a first weighting circuit (7) for weighting the first low-pass filter output signal with first coefficients to form a first weighted output signal; a circuit device for forming a masking signal for reducing stereo channel isolation from the first weighted output signal; a second weighting circuit (5) for forming a second weighted output signal weighted with second coefficients from the first low-pass filter output signal or the second low-pass filter output signal according to a switching signal (DD2) indicative of interference in the audio signals; a switch device (4) for selecting the first low-pass filter output signal for weighting in the second weighting circuit means (5) when no interference is indicated by the switching signal (DD2) and the second low-pass filter output signal for weighting in the second weighting circuit means (5) when interference is indicated by the switching signal (DD2); and a circuit device for forming a masking signal for damping the audio signal from the second weighted output signal.

摘要翻译： PCT No.PCT / DE94 / 00321 Sec。 371日期1995年8月25日 102（e）日期1995年8月25日PCT 1994年3月22日PCT公布。 公开号WO94 / 22229 日期1995年9月29日该电路装置包括：第一低通滤波器（2），用于对与接收的无线电信号的强度成正比的输入信号（H3）进行滤波; 用于对输入信号（H3）进行滤波的第二低通滤波器（3）; 第一加权电路（7），用于利用第一系数对第一低通滤波器输出信号进行加权，以形成第一加权输出信号; 电路装置，用于形成用于减少立体声信道隔离的屏蔽信号与第一加权输出信号; 第二加权电路（5），用于根据指示音频中的干扰的切换信号（DD2），从第一低通滤波器输出信号或第二低通滤波器输出信号形成用第二系数加权的第二加权输出信号 信号; 开关装置（4），用于当没有由开关信号（DD2）指示干扰和用于加权的第二低通滤波器输出信号时，在第二加权电路装置（5）中选择用于加权的第一低通滤波器输出信号 在第二加权电路装置（5）中，当由切换信号（DD2）指示干扰时; 以及电路装置，用于形成用于阻尼来自第二加权输出信号的音频信号的屏蔽信号。

公开(公告)号：US09913060B2

公开(公告)日：2018-03-06

申请号：US15471003

申请日：2017-03-28

申请人： Panasonic Intellectual Property Corporation of America

发明人： Hiroki Furukawa

IPC分类号： H04H40/72 ,  H04S1/00

CPC分类号： H04S1/002 ,  H04B1/1646 ,  H04H40/63 ,  H04H40/72 ,  H04S2420/07

摘要： A right expected value generator generates an expected value of a right channel spectrum from the right channel spectrum. Further, a left expected value generator generates an expected value of a left channel spectrum from the left channel spectrum. Further, a right channel spectrum corrector so corrects a right channel spectrum outputted from a second synthesizer that the right channel spectrum does not exceed the expected value of the right channel spectrum. Moreover, a left channel spectrum corrector so corrects a left channel spectrum outputted from the second synthesizer that the left channel spectrum does not exceed the expected value of the left channel spectrum.

公开(公告)号：US07133527B2

公开(公告)日：2006-11-07

申请号：US10486599

申请日：2002-08-06

申请人： Wolfdietrich Georg Kasperkovitz

发明人： Wolfdietrich Georg Kasperkovitz

IPC分类号： H04H5/00

CPC分类号： H03D1/2209 ,  H04B1/1646 ,  H04H40/63

摘要： An arrangement for decoding a stereo multiplex signal, comprising a baseband sum signal (L+R), a difference signal (L−R) which is amplitude-modulated on a suppressed sub-carrier and a pilot signal having a frequency located between the frequency bands of said sum and difference signals, said arrangement having an input for the stereo multiplex signal coupled through parallel stereo sum and difference signal paths to first and second inputs of a dematrix circuit, a synchronous demodulator being included in the difference signal path, a local sinusoidal sub-carrier being supplied to a carrier input of said synchronous demodulator for a synchronous demodulation of said amplitude-modulated difference signal (L−R) into baseband. To maximize stereo channel separation the arrangement is provided with an automatic gain control loop comprising a first mixer stage receiving a reference signal, a signal output thereof being coupled to a second mixer stage, both mixer stages having carrier inputs being supplied with said local sinusoidal sub-carrier for a respective up and down conversion of said reference signal, a signal output of said second mixer stage being coupled through a 6 dB attenuator to a difference circuit providing the difference between the output signal of the attenuator and the reference signal, said difference circuit being coupled to a control input of gain controlled amplifying means for varying the gain of said synchronous demodulator and said first and second mixer stages.

摘要翻译： 一种用于解码立体声多路复用信号的装置，包括基带和信号（L + R），在抑制子载波上被幅度调制的差分信号（LR）和具有频率位于 所述和差和差分信号，所述装置具有通过并行立体声和信号路径耦合到立体声多路复用信号的输入，以及差分信号路径中的第一和第二输入的同步解调器，局部正弦子 载波被提供给所述同步解调器的载波输入，用于将所述幅度调制差分信号（LR）同步解调成基带。 为了最大化立体声通道间隔，该装置设置有自动增益控制回路，该自动增益控制回路包括接收参考信号的第一混频器级，其信号输出耦合到第二混频器级，具有载波输入的两个混频器级被提供有所述局部正弦子 载波，用于对所述参考信号进行相应的上下转换，所述第二混频级的信号输出通过6dB衰减器耦合到提供衰减器的输出信号与参考信号之间的差的差电路，所述差 电路耦合到增益控制放大装置的控制输入，用于改变所述同步解调器和所述第一和第二混频器级的增益。

公开(公告)号：US4703501A

公开(公告)日：1987-10-27

申请号：US864656

申请日：1986-05-19

申请人： Yoshiro Sugai ,  Hiroyuki Kimura

发明人： Yoshiro Sugai ,  Hiroyuki Kimura

IPC分类号： H03G3/34 ,  H04B1/10 ,  H04B1/16 ,  H04H1/00 ,  H04H40/63 ,  H04H40/72 ,  H04H5/00

CPC分类号： H04H40/63 ,  H03G3/342 ,  H04B1/1646 ,  H04H40/72

摘要： A multiplex sound receiver in which a detection signal is extracted from a broadcast to indicate whether the broadcast is monaural, stereo, or multi-lingual. The detection signal is used for controlling the separating of the channels. According to the invention, the detection signal is processed in accordance with the strength of the broadcast or the noise level. For instance, the detection signal is integrated over a period that is increased when the field strength decreases.

摘要翻译： 一种多路复用声音接收器，其中从广播中提取检测信号以指示广播是单声道，立体声还是多语言。 检测信号用于控制通道的分离。 根据本发明，根据广播的强度或噪声水平来处理检测信号。 例如，当场强降低时，检测信号在增加的周期内被积分。

公开(公告)号：US4362906A

公开(公告)日：1982-12-07

申请号：US185846

申请日：1980-09-10

申请人： Kohji Ishida

发明人： Kohji Ishida

IPC分类号： H03D1/22 ,  H04B1/16 ,  H04H1/00 ,  H04H40/45 ,  H04H40/63 ,  H04H5/00

CPC分类号： H04H40/63 ,  H03D1/2236 ,  H04B1/1646

摘要： An FM receiver in which the length of the signal path is significantly shortened and in which separation between right and left channels is implemented by adjusting a DC bias voltage. A pulse train signal having a frequency dependent upon the instantaneous frequency of the received FM signal is generated. Subcarrier signals in and out of phase with a pilot signal component in the pulse train signal are produced and a variable DC component is added thereto. The subcarrier signals including the DC component are multiplied to obtain pulse train signals. The pulse train signals are integrated to yield right and left stereophonic channel signals.

摘要翻译： 一种FM接收器，其中信号路径的长度被显着地缩短，并且通过调整DC偏置电压来实现左和右声道之间的间隔。 产生具有取决于所接收的FM信号的瞬时频率的频率的脉冲串信号。 产生与脉冲序列信号中的导频信号分量相差和相位差的子载波信号，并向其添加可变的直流分量。 包括DC分量的副载波信号被乘以获得脉冲串信号。 脉冲串信号被积分以产生左右立体声通道信号。

公开(公告)号：US08934635B2

公开(公告)日：2015-01-13

申请号：US13519036

申请日：2010-12-21

申请人： Thomas Esnault ,  Frédéric Amadu

发明人： Thomas Esnault ,  Frédéric Amadu

IPC分类号： H04H20/47 ,  H04H40/63 ,  G10L19/008

CPC分类号： H04H40/63 ,  G10L19/008

摘要： A method of optimizing stereo reception for an analog radio by applying the demodulated right sound signal (SD) and left sound signal (SG) as input to a decorrelation module having a variable decorrelation rate. The decorrelation rate of the decorrelation module is modified as a function of the reception quality coefficient “alpha” provided by the radio. The decorrelation module applies a higher decorrelation rate for a smaller reception quality coefficient “alpha” and applies a lower decorrelation rate for a larger reception quality coefficient “alpha. Also, a module for generating high-pitched sounds to recreate the high-frequency component (SHF) of the right or left sound signals which has been removed in the event of poor reception.

摘要翻译： 一种通过将解调的右声音信号（SD）和左声音信号（SG）作为输入施加到具有可变去相关速率的去相关模块来优化模拟无线电的立体声接收的方法。 解相关模块的解相关率根据由无线电设备提供的接收质量系数“α”的函数被修改。 解相关模块对较小的接收质量系数“α”应用更高的去相关率，并且对较大的接收质量系数“α”应用较低的去相关速率。 另外，用于产生高音声音的模块，用于重现在接收不良的情况下被去除的右声音或左声音信号的高频分量（SHF）。

公开(公告)号：US20040208323A1

公开(公告)日：2004-10-21

申请号：US10486599

申请日：2004-02-11

发明人： Wolfdietrich Georg Kasperkovitz

IPC分类号： H04H005/00

CPC分类号： H03D1/2209 ,  H04B1/1646 ,  H04H40/63

摘要： An arrangement for decoding a stereo multiplex signal, comprising a baseband sum signal (LnullR), a difference signal (LnullR) which is amplitude-modulated on a suppressed sub-carrier and a pilot signal having a frequency located between the frequency bands of said sum and difference signals, said arrangement having an input for the stereo multiplex signal coupled through parallel stereo sum and difference signal paths to first and second inputs of a dematrix circuit, a synchronous demodulator being included in the difference signal path, a local sinusoidal sub-carrier being supplied to a carrier input of said synchronous demodulator for a synchronous demodulation of said amplitude-modulated difference signal (LnullR) into baseband. To maximize stereo channel separation the arrangement is provided with an automatic gain control loop comprising a first mixer stage receiving a reference signal, a signal output thereof being coupled to a second mixer stage, both mixer stages having carrier inputs being supplied with said local sinusoidal sub-carrier for a respective up and down conversion of said reference signal, a signal output of said second mixer stage being coupled through a 6 dB attenuator to a difference circuit providing the difference between the output signal of the attenuator and the reference signal, said difference circuit being coupled to a control input of gain controlled amplifying means for varying the gain of said synchronous demodulator and said first and second mixer stages.

摘要翻译： 一种用于解码立体声多路复用信号的装置，包括基带和信号（L + R），在抑制子载波上被幅度调制的差分信号（LR）和具有频率位于 所述和差和差分信号，所述装置具有通过并行立体声和信号路径耦合到立体声多路复用信号的输入，以及差分信号路径中的第一和第二输入的同步解调器，局部正弦子 载波被提供给所述同步解调器的载波输入，用于将所述幅度调制差分信号（LR）同步解调成基带。 为了最大化立体声通道间隔，该装置设置有自动增益控制回路，该自动增益控制回路包括接收参考信号的第一混频器级，其信号输出耦合到第二混频器级，具有载波输入的两个混频器级被提供有所述局部正弦子 载波，用于对所述参考信号进行相应的上下转换，所述第二混频级的信号输出通过6dB衰减器耦合到提供衰减器的输出信号与参考信号之间的差的差电路，所述差 电路耦合到增益控制放大装置的控制输入，用于改变所述同步解调器和所述第一和第二混频器级的增益。

公开(公告)号：US20040132418A1

公开(公告)日：2004-07-08

申请号：US10741187

申请日：2003-12-19

发明人： Jens Wildhagen

IPC分类号： H04B001/00

CPC分类号： H04H40/63 ,  H03D1/2254 ,  H04H2201/13

摘要： A signal receiver and a method for separating a RDS signal component from a received signal is described. After the received signal has been downconverted to the baseband, the baseband signal is split up into a first baseband signal for a first signal path and a second baseband signal for a second signal path. The first baseband signal is highpass filtered and forwarded to a frequency synchronization unit that generates a frequency synchronization carrier. The second baseband signal is modified in accordance with the frequency synchronization carrier provided by the first signal path, and a synchronized baseband signal is obtained that still comprises the full range of the RDS signal's spectral components.

摘要翻译： 描述信号接收机和用于从接收信号中分离RDS信号分量的方法。 在接收到的信号已经下变频到基带之后，基带信号被分成用于第一信号路径的第一基带信号和用于第二信号路径的第二基带信号。 第一基带信号被高通滤波并转发到产生频率同步载波的频率同步单元。 根据由第一信号路径提供的频率同步载波来修改第二基带信号，并且获得仍然包括RDS信号的全部范围的频谱分量的同步基带信号。

公开(公告)号：US20010026620A1

公开(公告)日：2001-10-04

申请号：US09822476

申请日：2001-04-02

发明人： Yuji Yamamoto

IPC分类号： H04H005/00

CPC分类号： H04H40/63 ,  H04B1/1676

摘要： A frequency modulation (FM) multiplex demodulation device is provided, in which the feeling of stereo is maintained excellent and the offensive noise to the ears can be reduced. The FM multiplex demodulation device includes: a filter for selecting a signal multiplexed by a subcarrier at 38 kHz from a composite signal; a noise detecting section for detecting noises from the composite signal; a ratio changing section for changing a composition ratio between an output signal from the filter and the composite signal, and for outputting a composed signal, the composition ratio being determined in response to the noises detected by the noise detecting section; a demodulating section for demodulating the multiplexed signal with multiplying the output signal from the ratio changing section by the subcarrier; an adding section for adding an output signal from the demodulating section to the composite signal; and a subtracting section for subtracting the output signal from the demodulating section from the composite signal.

摘要翻译： 提供了一种频率调制（FM）多路解调装置，其中立体声的感觉保持良好，并且可以减少对耳朵的令人反感的噪音。 FM多路解调装置包括：滤波器，用于从复合信号中选择由38kHz的副载波复用的信号; 噪声检测部分，用于从复合信号中检测噪声; 用于改变来自滤波器的输出信号与复合信号之间的组成比的比率变化部分，并且用于输出合成信号，该组成比是响应噪声检测部分检测到的噪声而确定的; 解调部分，用于通过将来自比例变化部分的输出信号乘以副载波来解调多路复用信号; 加法部分，用于将来自解调部分的输出信号加到合成信号上; 以及减法部分，用于从复合信号中减去来自解调部分的输出信号。