公开(公告)号：US07295631B2

公开(公告)日：2007-11-13

申请号：US10143057

申请日：2002-05-10

Applicant: Jens Wildhagen

Inventor： Jens Wildhagen

IPC: H03K9/00

CPC classification number: H04B1/1661 ,  H04B1/1676 ,  H04H20/34 ,  H04H40/45 ,  Y02D70/40

Abstract: A stereo demultiplexer is proposed which can be calculation power efficiently implemented in a DSP. Modern digital FM receivers exploit the information content in the in quadrature component of the modulated difference signal for a noise reduction. The proposed stereo demultiplexer derives the in phase component and the in quadrature component of the difference signal with a minimized number of sinus and cosinus calculations by first downconverting the modulated difference signal to a not synchronized complex baseband signal on basis of a fixed frequency, thereafter a complex sampling rate decimation unit sampling rate decimates the not synchronized complex baseband signal with a factor N and a second complex mixer synchronizes and coherent demodulates the sampling rate decimated not synchronized baseband signal on basis of a first complex carrier signal derived on basis of the pilot carrier signal and the fixed frequency. The proposed stereo demultiplexer can easily be combined with a noise reduction system and the digital demodulation of the RDS and ARI signals.

Abstract translation: 提出了一种可以在DSP中有效实现计算能力的立体声解复用器。 现代数字FM接收机利用调制差分信号的正交分量中的信息内容进行降噪。 所提出的立体声解复用器通过基于固定频率首先将调制的差分信号下变频到不同步的复基带信号，以最小数量的窦道和余弦计算得出差分信号的同相分量和正交分量，之后 复数采样率抽取单元采样率用因子N抽取不同步的复基带信号，第二复合混频器基于基于导频载波导出的第一复载波信号来同步和相干解调采样率抽取非同步基带信号 信号和固定频率。 所提出的立体声解复用器可以容易地与降噪系统和RDS和ARI信号的数字解调组合。

公开(公告)号：US20060274717A1

公开(公告)日：2006-12-07

申请号：US11484628

申请日：2006-07-12

Applicant: Carsten Merkle ,  Jens Wildhagen ,  Markus Zumkeller

Inventor： Carsten Merkle ,  Jens Wildhagen ,  Markus Zumkeller

IPC: H04J3/24

CPC classification number: H04H20/22 ,  H04H20/26 ,  H04H20/95 ,  H04H40/18 ,  H04H60/27

Abstract: A radio transmission signal consisting of signal frames that comprise a dynamic data part and a quasi-static data part according to the present invention is characterized in that the dynamic data part of a respective frame contains an indicator showing in which following frame the quasi-static data part of this respective frame will be repeated. Therewith, an alternative frequency of e.g. a digital shortwave signal like a DRM signal can easily and satisfactorily be checked before a fast seamless switching to this alternative frequency can be performed. The inventive method to perform a seamless switching of a receiver from a first currently tuned frequency to a second alternative frequency is characterized by the step of receiving at least one set of samples from a respective signal transmitted on at least one second frequency during a time period during which said indicator assures that it is secure that only data that has been transmitted at least once is transmitted as signal on said first frequency to gather some information about said alternative frequency.

公开(公告)号：US07092460B1

公开(公告)日：2006-08-15

申请号：US09691711

申请日：2000-10-18

Applicant: Jens Wildhagen

Inventor： Jens Wildhagen

IPC: H03D3/22

CPC classification number: H04B1/1646

Abstract: In a stereo demultiplexer receiving a frequency demodulated stereo-multiplex signal (m(t)) which comprises at least a stereo-difference signal (md(t)), a stereo-sum signal (ms(t)) and a pilot carrier, a PLL-circuit (4) to recover the pilot carrier and/or at least one harmonic thereof receives the sampling rate decimated stereo-sum signal (ms(t)) as input signal, which is sampling rate decimated by a decimation factor of D. Therefore, the sampling rate decimation filter in the sum path is used for the sampling rate decimation to generate the 2nd harmonic or any other harmonic of the pilot carrier. This sampling rate decimation filter is available anyway and therefore the sampling rate decimation of the pilot carrier can be performed without an additional filter.

Abstract translation: 在立体声解复用器中，接收包括至少立体声差分信号（m（t））的频率解调立体声多路复用信号（m（t）），立体声和信号（m < （t））和导频载波，用于恢复导频载波和/或其至少一个谐波的PLL电路（4）接收采样率抽取立体声和信号（m SUB） s（t））作为输入信号，其是抽取因子D抽取的采样率。因此，求和路径中的采样率抽取滤波器用于采样率抽取以产生2 < 谐波或导频载波的任何其他谐波。 该采样率抽取滤波器可用，因此导频载波的采样率抽取可以在没有附加滤波器的情况下执行。

公开(公告)号：US07076222B2

公开(公告)日：2006-07-11

申请号：US10299406

申请日：2002-11-19

Applicant: Jens Wildhagen

Inventor： Jens Wildhagen

IPC: H04B1/06

CPC classification number: H03G3/001 ,  H03G3/3036 ,  H03G3/3052

Abstract: An automatic gain control loop for a radio receiver, comprising a switchable lowpass filter (21) to reduce distortions in an analogue gain control signal (6) by switching said switchable lowpass filter (21) to a low time constant in case a change of a gain control signal (6) of the automatic gain control loop lies above a predetermined threshold, which low time constant is lower than a normally used time constant, comprises a hold unit (24) which affects that said switchable lowpass filter (21) uses said low time constant a predetermined time after a change of the gain control signal (6) of the automatic gain control loop lies below said predetermined threshold.

Abstract translation: 一种用于无线电接收机的自动增益控制回路，包括可切换低通滤波器（21），用于通过在所述低通滤波器（6）的改变时将所述可切换低通滤波器（21）切换到低时间常数来减少模拟增益控制信号（6）中的失真 所述自动增益控制环路的增益控制信号（6）位于预定阈值之上，所述预定阈值低于常用时间常数，所述预定阈值包括保持单元（24），所述保持单元影响所述可切换低通滤波器（21）使用所述 在自动增益控制环路的增益控制信号（6）的改变之后的预定时间内的低时间常数低于所述预定阈值。

公开(公告)号：US6075410A

公开(公告)日：2000-06-13

申请号：US259230

申请日：1999-03-01

Applicant: Jens Wildhagen

Inventor： Jens Wildhagen

IPC: H03D3/00 ,  G01Q80/00 ,  H04B1/26 ,  H04H20/88 ,  H04L27/233 ,  H04L27/14

CPC classification number: H04L27/2332

Abstract: A method and device for digitally demodulating a frequency modulated signal includes: calculating a phase of a digital complex baseband signal of a received frequency modulated signal, calculating an unwrapped phase of the calculated phase, detecting and eliminating 2.pi. phase jumps in the unwrapped phase to generate a corrected phase, and differentiating the corrected phase.

Abstract translation: 用于对频率调制信号进行数字解调的方法和装置包括：计算接收频率调制信号的数字复基带信号的相位，计算所计算的相位的展开相位，检测和消除展开相位中的2π相位跳变到 生成校正相位，并且校正相位。

公开(公告)号：US07697910B2

公开(公告)日：2010-04-13

申请号：US10741187

申请日：2003-12-19

Applicant: Jens Wildhagen

Inventor： Jens Wildhagen

IPC: H04B1/16

CPC classification number: H04H40/63 ,  H03D1/2254 ,  H04H2201/13

Abstract: 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.

Abstract translation: 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：US07292694B2

公开(公告)日：2007-11-06

申请号：US10225854

申请日：2002-08-22

Applicant: Jens Wildhagen

Inventor： Jens Wildhagen

IPC: H04H5/00

CPC classification number: H04B1/1676 ,  H04H40/72

Abstract: A method to denoise a stereo signal which comprises a stereo sum signal (Us(z)) and a stereo difference signal (Ud(z)), wherein a stereo to mono blending on basis of an attenuation of the stereo difference signal (Ud(z)) is performed, determines an attenuation of the stereo difference signal (Ud(z)) under consideration of the difference signal amplitude. Therefore, a stereo signal noise reducer which performs a stereo to mono blending on basis of an attenuation of the stereo difference signal, comprises an attenuation factor determination unit which determines an attenuation factor (Hatt) under consideration of the difference signal amplitude.

Abstract translation: 一种去噪立体声信号的方法，其包括立体声和信号（U S）（z）和立体声差分信号（U SUB）（z），其中立体声信号 执行基于立体声差分信号（U SUB（z））的衰减的单声道混合，确定立体声差分信号（U SUB）（z）的衰减 ））考虑差分信号幅度。 因此，基于立体声差分信号的衰减来执行立体声到单声道混合的立体声信号降噪器包括衰减因子确定单元，该衰减因子确定单元确定考虑到的衰减因子（HAT） 差信号幅度。

公开(公告)号：US07224675B1

公开(公告)日：2007-05-29

申请号：US09565246

申请日：2000-05-05

Applicant: Carsten Merkle ,  Jens Wildhagen ,  Markus Zumkeller

Inventor： Carsten Merkle ,  Jens Wildhagen ,  Markus Zumkeller

IPC: H04Q7/00

CPC classification number: H04H20/22 ,  H04H20/26 ,  H04H20/95 ,  H04H40/18 ,  H04H60/27

Abstract: A radio transmission signal consisting of signal frames that comprise a dynamic data part and a quasi-static data part according to the present invention is characterized in that the dynamic data part of a respective frame contains an indicator showing in which following frame the quasi-static data part of this respective frame will be repeated. Therewith, an alternative frequency of e.g. a digital shortwave signal like a DRM signal can easily and satisfactorily be checked before a fast seamless switching to this alternative frequency can be performed. The inventive method to perform a seamless switching of a receiver from a first currently tuned frequency to a second alternative frequency is characterized by the step of receiving at least one set of samples from a respective signal transmitted on at least one second frequency during a time period during which said indicator assures that it is secure that only data that has been transmitted at least once is transmitted as signal on said first frequency to gather some information about said alternative frequency.

Abstract translation: 根据本发明的由包括动态数据部分和准静态数据部分的信号帧组成的无线电传输信号的特征在于，各个帧的动态数据部分包含指示符，其中在下面的帧中准静态 将重复该相应帧的数据部分。 因此，例如， 诸如DRM信号的数字短波信号可以在可以执行到该替代频率的快速无缝切换之前容易且令人满意地被检查。 执行接收机从第一当前调谐频率到第二替代频率的无缝切换的本发明方法的特征在于，在一段时间段内从在至少一个第二频率上发射的相应信号中接收至少一组采样的步骤 在此期间，所述指示器确保仅将已经发送的数据至少一次的信号作为所述第一频率上的信号发送以收集关于所述替代频率的一些信息是安全的。

公开(公告)号：US07170950B2

公开(公告)日：2007-01-30

申请号：US10191190

申请日：2002-07-09

Applicant: Jens Wildhagen ,  Dietmar Schill

Inventor： Jens Wildhagen ,  Dietmar Schill

IPC: H03C1/52

CPC classification number: H04H60/07 ,  H03C1/60 ,  H04H20/36 ,  H04H2201/12 ,  H04H2201/20

Abstract: An AM simulcast broadcast signal combining a digital transmission signal and an analogue transmission signal in one transmission channel. The digital transmission signal is modulated to one sideband of a carrier of the transmission channel and a correcting signal (C) is modulated to the other sideband of the carrier of the transmission channel, which correcting signal (C) is determined so that the envelope demodulation of the transmission channel represents the analogue transmission signal.

Abstract translation: 在一个传输信道中组合数字传输信号和模拟传输信号的AM同播广播信号。 数字传输信号被调制到传输信道的载波的一个边带，并且校正信号（C）被调制到传输信道的载波的另一个边带，该校正信号（C）被确定为使得包络解调 的传输信道表示模拟传输信号。

公开(公告)号：US20050147181A1

公开(公告)日：2005-07-07

申请号：US11068286

申请日：2005-02-28

Applicant: Dieter Schill ,  Jens Wildhagen

Inventor： Dieter Schill ,  Jens Wildhagen

IPC: H04B3/06 ,  B66F7/06 ,  H04L25/03 ,  H04L27/04

CPC classification number: B66F7/065 ,  H04L25/03057 ,  H04L25/03343 ,  H04L2025/03617 ,  H04L2025/03681

Abstract: A method for preprocessing a signal and for signal processing are suggested, wherein an iterative process with at least one iteration is performed to generate an output signal (O) based on an input signal (I). In each iteration a preceding intermediate output signal (PIO) and said input signal (I) are received (S21). A process (g) is applied (S22) to said preceding intermediate output signal (PIO) to transform the latter according to a given transfer function (h) so as to generate a transformed preceding intermediate output signal (TPIO). Then, said input signal (I) is subtracted (S23) from said transformed intermediate output signal (TPIO). Thereby, an intermediate error signal (IE) is generated and then added to said intermediate output signal (PIO) so as to generate a succeeding intermediate output signal (SIO) which is used as an output signal (O) after the iterative process stopped.

Abstract translation: 提出了一种用于预处理信号和信号处理的方法，其中执行具有至少一次迭代的迭代过程以基于输入信号（I）生成输出信号（O）。 在每次迭代中，接收前一中间输出信号（PIO）和所述输入信号（I）（S21）。 将过程（g）应用于所述先前的中间输出信号（PIO），以根据给定的传递函数（h）对其进行变换，以便产生变换的先前的中间输出信号（TPIO）。 然后，从所述变换的中间输出信号（TPIO）中减去所述输入信号（I）（S 23）。 由此，产生中间误差信号（IE），然后将其相加到所述中间输出信号（PIO），以产生在迭代处理停止之后用作输出信号（O）的后续中间输出信号（SIO）。