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41.发明授权
公开(公告)号：US4169968A
公开(公告)日：1979-10-02
申请号：US872984
申请日：1978-01-27
Applicant: Norman W. Parker
Inventor： Norman W. Parker
CPC classification number: H04H20/49
Abstract: The cosine correction factor of a receiver for compatible AM stereo reception is controlled by the amount of high frequency energy present in the demodulated signal. Large amounts of such energy indicate a low signal-to-noise ratio and cosine correction under such conditions is then not desirable. During periods of excessive high frequency energy, a filter circuit output causes a switching circuit to remove the derived cosine correction factor and cause division of the demodulated signal by a factor of one instead.
Abstract translation: 用于兼容AM立体声接收的接收机的余弦校正因子由解调信号中存在的高频能量的量来控制。 大量的这种能量表明低的信噪比和在这种条件下的余弦校正是不期望的。 在过高的高频能量期间，滤波器电路输出导致开关电路去除导出的余弦校正因子，并且导致解调信号的除数为1。 余弦相位检测器（24）的输出通过开关电路（27）耦合到分频器（25）。 检测器（24）的输出还耦合到高通滤波器（29），其输出耦合到开关电路（27）的第一控制输入端。 第二控制输入（30）提供参考信号。 当接收信号的S / N比低时，仅包含接收信号的相位信息的限幅器的输出包含大量高频能量时，高通滤波器（29）提供切换 电路（27），足以将检测器（24）的输出与分频器（25）断开的控制电压，并且替换参考电压，其使得分频器（25）有效地将解调信号（ LR）cos DIAMETER信号乘以1。
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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
Applicant: Rafael Jan Jozef Meeusen
Inventor： Rafael Jan Jozef Meeusen
CPC classification number: H04B1/1653 , H04H40/45
Abstract: 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.
Abstract translation: 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：US08050412B2
公开(公告)日：2011-11-01
申请号：US11011565
申请日：2004-12-14
Applicant: David Chaohua Wu
Inventor： David Chaohua Wu
CPC classification number: H04N5/607 , H04H20/48 , H04N5/602 , H04N21/8106 , H04N21/85406
Abstract: A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value and a left channel signal value. A DSP (60) recursively finds a preferred coefficient value for a scaling that reduces stereo separation due to amplitude variation of the right and left channel signal values. The preferred coefficient value is thereafter used for scaling the right and left channel signal values.
Abstract translation: 解调器（10）将电视信号转换为视频基带信号和包括表示右声道信号值和左声道信号值的立体声信号的音频基带信号。 DSP（60）递归地找到由于右和左声道信号值的幅度变化而减小立体声分离的缩放的优选系数值。 此后优选的系数值用于缩放左右声道信号值。
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公开(公告)号：US07894609B2
公开(公告)日：2011-02-22
申请号：US10520316
申请日：2003-07-01
Applicant: Björn Heinsen
Inventor： Björn Heinsen
CPC classification number: H04S1/007
Abstract: Disclosed is a stereo signal processing apparatus, in particular for a digital BTSC television decoder, comprising a sub-channel signal processing section which comprises an input for inputting an input sub-channel signal, a DBX expanding means and an output for outputting an output sub-channel signal. The particularity of the present invention is that said sub-channel signal processing section further comprises a phase error compensating means for correcting a phase error of said DBX expanding means so that at said output of said sub-channel signal processing section the phase of the output sub-channel signal is essentially constant or zero over a predetermined frequency range.
Abstract translation: 公开了一种立体声信号处理装置，特别是对于数字BTSC电视解码器，其包括子信道信号处理部分，其包括用于输入输入子信道信号的输入，DBX扩展装置和用于输出输出子信号的输出 通道信号。 本发明的特征在于，所述子信道信号处理部分还包括相位误差补偿装置，用于校正所述DBX扩展装置的相位误差，使得在所述子信道信号处理部分的所述输出处，输出的相位 子信道信号在预定频率范围内基本上恒定或为零。
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公开(公告)号：US5915028A
公开(公告)日：1999-06-22
申请号：US809739
申请日：1997-05-13
Applicant: Djahanyar Chahabadi
Inventor： Djahanyar Chahabadi
CPC classification number: H04H20/49 , H04S1/007 , H03D1/2209
Abstract: An amplitude demodulator for demodulating a quadrature-amplitude modulated stereo signal for radio receivers, where a digital intermediate-frequency signal is constructed from a received signal, the intermediate-frequency signal is converted into a baseband, creating two orthogonal components thereby, a magnitude signal and a phase signal are derived from the orthogonal components, a tangent is constructed from the phase signal, and the tangent is multiplied by the magnitude signal to create a stereo difference signal.
Abstract translation: PCT No.PCT / DE95 / 01227 Sec。 371日期1997年5月13日 102（e）日期1997年5月13日PCT提交1995年9月8日PCT公布。 公开号WO96 / 10290 日期1996年4月4日一种用于解调用于无线电接收机的正交幅度调制立体声信号的幅度解调器，其中从接收信号构建数字中频信号，将中频信号转换为基带，产生两个正交分量 从而从正交分量导出幅度信号和相位信号，从相位信号构建切线，并将正切乘以幅度信号以产生立体声差分信号。
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Patent Agency Ranking
公开(公告)号：US5359661A
公开(公告)日：1994-10-25
申请号：US954997
申请日：1992-10-01
Applicant: Gregory J. Manlove , Detlef Griessman , Richard A. Kennedy , Thomas G. Block
Inventor： Gregory J. Manlove , Detlef Griessman , Richard A. Kennedy , Thomas G. Block
CPC classification number: H04H20/49 , Y10S331/02
Abstract: An AM stereo receiver in which a synchronous in-phase signal is determined comprises a low pass filter circuit for determining an average DC value of the synchronous in-phase signal, a reference voltage supply for providing a reference voltage indicative of a predetermined portion of the DC value of the synchronous in-phase signal occurring during a 100% IF signal level condition, a comparison circuit for comparing the average DC value of the synchronous in-phase signal to the predetermined reference, and an output circuit outputting a signal indicative of an out-of-lock condition when the average DC value of the synchronous in-phase signal falls below the predetermined reference.
Abstract translation: 其中确定同步同相信号的AM立体声接收机包括用于确定同步同相信号的平均DC值的低通滤波器电路，用于提供指示所述同步同相信号的预定部分的参考电压的参考电压电源 在100％IF信号电平条件期间发生的同步同相信号的DC值，用于将同步同相信号的平均DC值与预定基准进行比较的比较电路，以及输出指示 当同步同相信号的平均DC值低于预定参考值时，锁定状态失效。
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公开(公告)号：US5008939A
公开(公告)日：1991-04-16
申请号：US387504
申请日：1989-07-28
Applicant: Amar G. Bose , William R. Short
Inventor： Amar G. Bose , William R. Short
CPC classification number: H04H20/49 , H04B1/1027 , H04B1/302 , H04B2001/1063
Abstract: A receiver for receiving an amplitude modulated signal with upper and lower sidebands, comprising: an independent sideband decoder for providing demodulated upper and lower sideband audio signals, a combiner for differentially combining the upper and lower sideband audio signals to provide a noise signal, a quality detector apparatus for providing upper and lower quality signals representative of undesired noise in the upper and lower sideband audio signals respectively, and a selector responsive to the quality signals for processing the upper and lower sideband audio signals to provide an output audio signal with reduced noise. The quality detector includes a correlator for correlating the noise and audio signal in the associated sideband to provide the quality signals. In another aspect of the invention, the receiver also comprises a plurality of band-pass filters for selectively transmitting spectral components of the upper and lower sideband audio signals in contiguous frequency bands, a corresponding plurality of said combiners, and a summer for summing the output audio signals provided by said selectors. The quality detectors and the selectors are associated with a respective band pass filter.
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48.发明授权
公开(公告)号：US4955072A
公开(公告)日：1990-09-04
申请号：US396669
申请日：1989-08-22
Applicant: Nenad Tomljenovic
Inventor： Nenad Tomljenovic
Abstract: In the case of a method for the generation of an amplitude-modulated ISB transmission signal from different AF signal (NF1,2), the signal vectors are split into signal components (x1,y1 and x2,y2, respectively), components sums (X,Y) are formed from the signal components and an amplitude signal (A(t)) and a harmonic phase signal are derived from the component sums. Amplitude signal and phase signal are then further processed separately and combined at the single transmitting tube (43) by combined amplitude modulation and phase modulation into the final transmission signal.
Abstract translation: 在用于从不同的AF信号（NF1,2）产生幅度调制的ISB发送信号的方法的情况下，将信号矢量分成信号分量（分别为x1，y1和x2，y2），分量和 X，Y）由信号分量形成，并且从分量和导出振幅信号（A（t））和谐波相位信号。 然后将幅度信号和相位信号分别进一步处理，并通过组合幅度调制和相位调制在单个发射管（43）处组合成最终传输信号。
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公开(公告)号：US4845750A
公开(公告)日：1989-07-04
申请号：US121361
申请日：1987-11-16
Applicant: Lawrence M. Ecklund , Roy H. Espe
Inventor： Lawrence M. Ecklund , Roy H. Espe
CPC classification number: H04H20/49
Abstract: In an AM stereophonic receiver a voltage is developed in response to negative overmodulation in the received signal, to detection of a pilot tone, to detection of a minimum or no signal strength condition, and to external control. Predetermined levels of this voltage are utilized to enable/disenable various function circuits within the receiver to optimize the operation.
Abstract translation: 在AM立体声接收机中，响应于接收信号中的负调制，检测导频，检测最小或无信号强度条件以及外部控制，产生电压。 该电压的预定电平用于使/禁用接收器内的各种功能电路以优化操作。
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公开(公告)号：US4747141A
公开(公告)日：1988-05-24
申请号：US544752
申请日：1983-10-24
Applicant: Leonard R. Kahn
Inventor： Leonard R. Kahn
CPC classification number: H04H20/49
Abstract: A simplified stereo signal decoder is disclosed for use in an AM stereo receiver which receives composite AM stereo broadcast signals comprising a radio frequency carrier wave having amplitude modulation representing stereo sum (L+R information and phase modulation representing stereo difference (L-R) information. The decoder makes novel use of a common, commercially available integrated circuit (IC) that normally is used as a tone detector or a frequency-modulation (FM) detector. The decoder provides synchronous detection of the (L-R) information, combined two-mode phase-locked loop (PLL) recovery of the carrier component and enabling of the (L-R) signal output, and delayed enabling of the (L-R) signal output for a "stereo bloom" effect. The decoder is particularly useful for decoding independent sideband (ISB) AM stereo broadcast signals.
Abstract translation: 公开了一种用于AM立体声接收机的简化立体声信号解码器，其接收包括具有代表立体声和（L + R信息和表示立体声差异（LR）信息的相位调制）的幅度调制的射频载波的复合AM立体声广播信号。 解码器通常用作通常用作音调检测器或调频（FM）检测器的商用集成电路（IC），解码器提供对（LR）信息的同步检测，组合的双模相位 锁定回路（PLL）恢复载波分量并使能（LR）信号输出，并且延迟（LR）信号输出对“立体声开花”效应的使能，解码器特别适用于解码独立边带（ISB ）AM立体声广播信号。
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