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公开(公告)号：US5561716A
公开(公告)日：1996-10-01
申请号：US343385
申请日：1994-11-22
申请人： Jurgen Kasser , Stefan Bartels
发明人： Jurgen Kasser , Stefan Bartels
CPC分类号： H04S1/00 , H03D1/2209
摘要： In a demodulator for a stereo signal transmitted by amplitude and phase modulation of a carrier, a phase signal and a quantity signal are formed. By multiplication of the quantity signal with the tangent of the phase signal reduced by a value to be preset, a difference signal is formed. The value to be preset is generated in such a way as to minimize the direct portion of the difference signal.
摘要翻译： 在通过载波的幅度和相位调制发送的用于立体声信号的解调器中，形成相位信号和量信号。 通过将量信号与相位信号的切线相乘而减少预设的值，形成差分信号。 产生要预设的值，以使差分信号的直接部分最小化。
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公开(公告)号：US5418815A
公开(公告)日：1995-05-23
申请号：US76131
申请日：1993-06-14
申请人： Tatsuya Ishikawa , Noboru Taga
发明人： Tatsuya Ishikawa , Noboru Taga
IPC分类号： H03B28/00 , H03D1/22 , H03D3/00 , H03D3/24 , H03D5/00 , H03D7/16 , H04L27/00 , H04L27/38 , H04N5/44 , H04N5/455 , H04N5/46 , H04N9/00
CPC分类号： H04N5/46 , H03D3/007 , H03D3/24 , H03D5/00 , H03D7/166 , H04L27/0008 , H04L27/3827 , H04N21/42638 , H04N5/4401 , H04N5/455 , H03B28/00 , H03D1/2245 , H03D3/006 , H03D7/161 , H03D7/165
摘要： A receiver for selectively receiving high frequency signals from analog modulated signals and digital modulated signals. The receiver has an intermediate frequency signal circuit for selecting a desired channel of the high frequency signals and for frequency-converting the high frequency signal of the selected channel into an intermediate frequency signal, a demodulator for demodulating the intermediate frequency signal, which is adapted to be capable of demodulating modulated signals in a variety of modulation systems, the demodulator including at least a digital section, and a controller for controlling the demodulator to be able to discriminate between the analog modulated signals and the digital modulated signals, based on a demodulated signal output from the digital section of the demodulator and to be switched into a demodulation mode suited for modulation system of the selected channel of the high frequency signals.
摘要翻译： 用于从模拟调制信号和数字调制信号中有选择地接收高频信号的接收机。 接收机具有中频信号电路，用于选择高频信号的期望信道，并将所选信道的高频信号频率转换成中频信号，解调器用于解调中频信号，该解调器适于 能够解调各种调制系统中的调制信号，解调器至少包括数字部分，以及控制器，用于控制解调器能够基于解调信号来区分模拟调制信号和数字调制信号 从解调器的数字部分输出并切换到适合所选频道的高频信号的调制系统的解调模式。
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73.发明授权
公开(公告)号：US4947408A
公开(公告)日：1990-08-07
申请号：US350813
申请日：1989-05-12
申请人： Ramin Sadr , William J. Hurd
发明人： Ramin Sadr , William J. Hurd
CPC分类号： H03D1/2245 , H03D3/007 , H03C3/005 , H03D2200/005 , H03D2200/0056 , H03D2200/006 , H03D3/006 , H03D5/00
摘要： In a digital device having an input thereto comprising a digital sample stream at a frequency F, a method for employing a component therein designed to work at a frequency less than F. The method in general comprises the steps of, dividing the digital sample stream into odd and even digital sample streams each at a frequency of F/2; passing one of the digital sample streams through the component designed to work at a frequency less than F wherein said component responds only to the odd or even digital samples in the one of the digital sample streams; delaying the other of the digital sample streams for the time it takes the one of the digital sample streams to pass through the component; and, adding the one of the digital sample streams after passing through the component with the delayed other of the digital sample streams. In the specific example, the component is a finite-impulse-response filter of order [(N+1)/2] and the step of delaying comprises passing the other of the digital sample streams through a shift register for a time (in sampling periods) of [(N+1)/2]+r, where r is a pipeline delay through the finite-impulse-response filter.
摘要翻译： 在具有其输入的数字设备中，其具有频率为F的数字采样流，其中使用其中设计成以小于F的频率工作的组件的方法。该方法通常包括以下步骤：将数字采样流分成 每个频率为F / 2的奇数和偶数数字采样流; 通过被设计为以小于F的频率工作的组件的数字采样流之一，其中所述分量仅对数字样本流中的一个数字样本流中的奇数或偶数数字采样进行响应; 在其中一个数字采样流通过该组件的时间内延迟数字采样流中的另一个; 并且在通过具有延迟的其他数字样本流的分量之后添加数字样本流中的一个。 在具体示例中，组件是[（N + 1）/ 2]阶的有限脉冲响应滤波器，并且延迟步骤包括使另一数字采样流通过移位寄存器一段时间 周期）[（N + 1）/ 2] + r，其中r是通过有限脉冲响应滤波器的流水线延迟。
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公开(公告)号：US4835792A
公开(公告)日：1989-05-30
申请号：US147540
申请日：1988-01-25
申请人： Faramaz Davarian
发明人： Faramaz Davarian
IPC分类号： H03D5/00 , H03J7/04 , H04L27/18 , H04L27/233
CPC分类号： H04L27/2331 , H03D5/00 , H03J7/04
摘要： A dual purpose receiver operable both on FM analog (voice) and MSK digital (data) signals has a demodulation section having a selectable time delay D.sub.1 for processing MSK digital signals and a time delay D.sub.2 for processing FM analog signals. A switch permits selection of the time delay for the demodulating mode desired. A second switch set according to how the first switch is set connects a digital processing circuit or an analog processing circuit to the output of the demodulation section. Small frequency errors due to frequency drift of the local oscillator or signal source and doppler effects can be eliminated by an automatic frequency control (AFC) circuit responsive to the output of the demodulator in the analog mode, and through a third switch responsive to a signal developed by mixing the input signal with the input signal delayed by a time delay D.sub.1, and mixing the output of that mixer with the binary output of the receiver in the MSK mode.
摘要翻译： 一种兼容于FM模拟（语音）和MSK数字（数据）信号的双用途接收器具有一个具有用于处理MSK数字信号的可选择时间延迟D1和用于处理FM模拟信号的时间延迟D2的解调部分。 开关允许选择所需的解调模式的时间延迟。 根据如何设置第一开关的第二开关组将数字处理电路或模拟处理电路连接到解调部分的输出端。 可以通过响应于模拟模式下的解调器的输出的自动频率控制（AFC）电路以及响应于信号的第三开关消除由于本地振荡器或信号源的频率漂移引起的小的频率误差和多普勒效应 通过将输入信号与延迟了时间延迟D1的输入信号混合，并将该混频器的输出与接收机的二进制输出以MSK模式进行混频而产生。
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公开(公告)号：US4583239A
公开(公告)日：1986-04-15
申请号：US662050
申请日：1984-10-18
申请人： Ian A. W. Vance
发明人： Ian A. W. Vance
IPC分类号： H04L27/227 , H03D3/00 , H04L27/152 , H04L27/38 , H03D1/22 , H03D5/00 , H04B1/30
CPC分类号： H03D3/007 , H04L27/1525 , H04L27/38 , H03D2200/005 , H03D2200/0052 , H03D3/006
摘要： A direct conversion receiver in which the quadrature I and Q signals are converted into pulse density modulated digital data streams by delta-sigma modulators 14, 15. The resultant digital data streams are then processed in a logic block 18 according to predetermined logic truth tables. The digital output of the processor 18 is then converted back to an analogue signal.
摘要翻译： 一种直接转换接收器，其中正交I和Q信号由Δ-Σ调制器14,15转换成脉冲密度调制的数字数据流。然后根据预定的逻辑真值表，在逻辑块18中对所得的数字数据流进行处理。 然后将处理器18的数字输出转换回模拟信号。
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76.发明授权
公开(公告)号：US4577157A
公开(公告)日：1986-03-18
申请号：US560686
申请日：1983-12-12
申请人： Joseph Reed
发明人： Joseph Reed
摘要： Apparatus is depicted which enables the sampling of the phase angle of a modulated signal and manipulates the sample signals to demodulate the same. The apparatus is particularly adaptable for use in demodulating the I and Q channel signals of a zero IF receiver. The system contains an angle sensing circuit which combines the I and Q channel signals in differential form to produce a series of output signals of an angular range indicative of the present value of the instanteous phase. The signals from the angle detector are coupled to an octant decoder which operates to determine the particular octant that the angle is to be included in. In the present system eight octants are used, each comprising 45.degree.. The octant decoder determines which octant the angle belongs in and assigns a predetermined angle value to that angle. In one embodiment, the assigned angle values are 0.degree., 45.degree., 90.degree., 135.degree., 180.degree., 225.degree., 270.degree. or 315.degree.. The value of the assigned angles are then sampled by means of a clock at a high frequency rate whereby the resultant pulses indicative of the angles are then processed as differentiated to produce an output signal indicative of the information content on the original signal.
摘要翻译： 描述了使得能够对调制信号的相位角进行采样并操纵采样信号以对其进行解调的装置。 该装置特别适用于解调零IF接收机的I和Q信道信号。 该系统包含一个角度感测电路，其组合了差分形式的I和Q通道信号，以产生一系列表示瞬时相位的当前值的角度范围的输出信号。 来自角度检测器的信号被耦合到八分圆解码器，其操作以确定该角度将被包括在内的特定八分圆。在本系统中，使用八个八分圆，每个八分之一包含45度。 八分圆解码器确定角度属于哪个八分圆，并且为该角度分配预定的角度值。 在一个实施例中，分配的角度值为0°，45°，90°，135°，180°，225°，270°或315°。 然后借助于高频率的时钟对所分配的角度的值进行采样，由此将指示角度的合成脉冲进行微分处理，以产生指示原始信号上的信息内容的输出信号。
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公开(公告)号：US4499426A
公开(公告)日：1985-02-12
申请号：US429380
申请日：1982-09-30
申请人： Norman W. Parker
发明人： Norman W. Parker
CPC分类号： H04B1/68 , H03C3/005 , H04B14/006
摘要： A baseband discriminator decodes a pair of trigonometric transform function signals, sin f(t) and cos f(t), to provide an original audio signal f(t) by first deriving the derivative of the audio signal from the pair of trigonometric signals and integrating that derivative. The discriminator is used in a new system of SSB transmission termed "transform modulation" and also in FM transmission.
摘要翻译： 基带鉴频器通过一对三角函数信号sin f（t）和cos f（t）来解码，以通过首先从一对三角信号中导出音频信号的导数来提供原始音频信号f（t），以及 整合该衍生物。 鉴别器用于称为“变换调制”的SSB传输的新系统中，也用于FM传输。
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公开(公告)号：US4388496A
公开(公告)日：1983-06-14
申请号：US291968
申请日：1981-08-11
申请人： Yukihiko Miyamoto
发明人： Yukihiko Miyamoto
CPC分类号： H03D5/00
摘要： An FM/AM stereo receiver for receiving an RF FM stereo signal by FM stereo broadcasting and an RF AM stereo signal of AM-PM or AM-FM system by AM stereo broadcasting. One limiter is used both as a limiter for limiting an IF FM stereo signal in an FM stereo receiving system and as a limiter for obtaining an IF PM or FM difference signal in an AM stereo receiving system. One FM demodulator is employed both as an FM demodulator for obtaining a composite signal in the FM stereo receiving system and as an IF demodulator for obtaining an IF PM difference signal or a difference signal in the AM stereo receiving system.
摘要翻译： FM / AM立体声接收机，通过FM立体声广播接收RF FM立体声信号，通过AM立体声广播接收AM-PM或AM-FM系统的RF AM立体声信号。 一个限幅器既用作限制FM立体声接收系统中的IF FM立体声信号的限制器，也用作在AM立体声接收系统中获得IF PM或FM差分信号的限幅器。 一个FM解调器既用作FM解调器，用于在FM立体声接收系统中获得复合信号，并且用作IF解调器，用于获得AM立体声接收系统中的IF PM差分信号或差分信号。
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公开(公告)号：US4130806A
公开(公告)日：1978-12-19
申请号：US799884
申请日：1977-05-23
CPC分类号： H04L27/06 , H03D3/007 , H03D5/00 , H03D2200/0047 , H03D2200/0056 , H03D2200/006 , H03D2200/0082 , H03D7/165
摘要： A digital filter and demodulation arrangement for passband signals, whose corresponding baseband signal has a bandwidth limited to a given maximum frequency. The passband signals are filtered according to two bandpass characteristics which, apart from their asymmetrical distortion relative to their central frequency, are versions from one another shifted 90.degree. in phase. The filtered passband signals are demodulated with an in-phase carrier and a quadrature carrier and the demodulated signals are combined to a baseband signal.In the digital filtering process the sampling frequency is reduced from a value higher than twice the highest frequency in the passband signals to a value which is not higher than twice said maximum frequency in the baseband signal and in the digital demodulation and combination processes the reduced sampling frequency is also used so that a considerable reduction in the internal processing speed is obtained.
摘要翻译： 用于通带信号的数字滤波器和解调装置，其相应的基带信号的带宽限制在给定的最大频率上。 根据两个带通特性对通带信号进行滤波，除了相对于它们的中心频率的不对称失真之外，它们的相位是相位相差90°。 滤波后的通带信号用同相载波和正交载波进行解调，解调后的信号与基带信号组合。
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公开(公告)号：US4001702A
公开(公告)日：1977-01-04
申请号：US628569
申请日：1975-11-03
申请人： Barry M. Kaufman
发明人： Barry M. Kaufman
摘要： A high speed arrangement for simultaneously demodulating the AM and FM information coming in on a tone frequency carrier. In the case of the incoming tone signal being only FM modulated, the FM demodulator extracts the data whereas the AM demodulator provides an output which can be used to squelch the FM demodulated data channel when noise or interference reaches a predetermined level.
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