公开(公告)号：US5608446A

公开(公告)日：1997-03-04

申请号：US437349

申请日：1995-05-09

申请人： Daniel J. Carr ,  Eric L. Edberg ,  Venkata C. Majeti ,  John L. Shepherd

发明人： Daniel J. Carr ,  Eric L. Edberg ,  Venkata C. Majeti ,  John L. Shepherd

IPC分类号： H04H20/79 ,  H04H20/86 ,  H04H40/18 ,  H04H60/94 ,  H04L12/28 ,  H04L25/14 ,  H04M11/00 ,  H04N7/173 ,  H04N7/14

CPC分类号： H04L12/2801 ,  H04H20/79 ,  H04H60/94 ,  H04L25/14 ,  H04N7/17309 ,  H04H20/86 ,  H04H40/18

摘要： Data communications apparatus and methods employing a bidirectional low bandwidth channel and a unidirectional high bandwidth channel. A PC is coupled to an information source by a communications system which provides both a bidirectional low bandwidth channel between the PC and the information source and a high bandwidth channel in which the information source is the source and the PC is the sink. A component of the communications system termed the director responds to a message received in the low bandwidth channel by switching the information being sent from the information source to the PC to the high or low bandwidth channel as specified in the message. The message may come either from the PC or the information source. A graphical user interface at the PC provides the user with "buttons" to specify the bandwidth. The apparatus and methods may be advantageously employed to provide telecommuting services.

摘要翻译： 采用双向低带宽信道和单向高带宽信道的数据通信装置和方法。 PC通过在PC和信息源之间提供双向低带宽信道的通信系统和信息源是源的高带宽信道并且PC是信宿的通信系统耦合到信息源。 被称为导向器的通信系统的组件通过将从信息源发送的信息切换到消息中指定的高或低带宽信道来响应在低带宽信道中接收的消息。 消息可能来自PC或信息源。 PC上的图形用户界面为用户提供了“按钮”来指定带宽。 该装置和方法可以有利地用于提供远程办公服务。

公开(公告)号：US5606618A

公开(公告)日：1997-02-25

申请号：US173850

申请日：1993-12-27

申请人： Gerardus C. P. Lokhoff ,  Y. F. Dehery ,  G. Stoll ,  G. Theile

发明人： Gerardus C. P. Lokhoff ,  Y. F. Dehery ,  G. Stoll ,  G. Theile

IPC分类号： G01L7/04 ,  G10L19/00 ,  G10L19/02 ,  G10L19/14 ,  G11B20/00 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/30 ,  H03M5/14 ,  H04B1/66 ,  H04B14/04 ,  H04H20/28 ,  H04H20/30 ,  H04H20/31 ,  H04H20/47 ,  H04H20/88 ,  H04H20/89 ,  H04H20/95 ,  H04H40/18 ,  H04H40/36 ,  H04H60/07 ,  H04H60/13 ,  H04H60/18 ,  H04J3/16 ,  H04L7/00 ,  H04N7/08 ,  H04H5/00 ,  G10L1/06

CPC分类号： H04H20/88 ,  G10L19/008 ,  G10L19/0208 ,  G11B20/00007 ,  G11B20/10 ,  G11B20/10527 ,  G11B20/12 ,  G11B20/1833 ,  G11B27/3027 ,  H04B1/665 ,  H04B1/667 ,  H04H20/28 ,  H04H20/30 ,  H04H20/47 ,  H04H20/89 ,  H04H20/95 ,  H04H40/36 ,  H04H60/07 ,  H04H60/13 ,  G11B20/00086 ,  G11B20/00992 ,  G11B2020/10592 ,  G11B2020/10601 ,  G11B2220/90 ,  G11B2220/913 ,  G11B2220/93 ,  H04H20/31 ,  H04H40/18 ,  H04H60/18

摘要： Reproduction accuracy of, for example a digital stereo audio signal, is improved by transmitting sample data as sub-signals such as frequency subband signals. In one or more subbands, corresponding components such as left and right stereo channels are combined so that only one composite signal is transmitted per subband. An indicator signal is transmitted, indicating which subbands are combined. Scale factor signals for all subbands, and for the relative intensity of the respective subband signals which were combined, may also be transmitted. In the receiver a subband signal is derived for each channel from the composite signal, before synthesis of the full channel signals which will be reproduced.

摘要翻译： 通过将样本数据作为子信号（例如频率子带信号）发送来改善例如数字立体声音频信号的再生精度。 在一个或多个子带中，组合诸如左立体声通道和右立体声通道的相应组件，使得每个子频带仅传送一个复合信号。 发送指示符信号，指示哪些子带被组合。 也可以发送所有子带的比例因子信号，以及组合的各个子带信号的相对强度。 在接收机中，在合成将被再现的全信道信号之前，从复合信号中为每个信道导出子带信号。

公开(公告)号：US5521944A

公开(公告)日：1996-05-28

申请号：US246737

申请日：1994-05-20

申请人： Wilhelm Hegeler ,  Jurgen Kasser ,  Detlev Nyenhuis ,  Lothar Vogt

发明人： Wilhelm Hegeler ,  Jurgen Kasser ,  Detlev Nyenhuis ,  Lothar Vogt

IPC分类号： H04L27/22 ,  H04H20/34 ,  H04H40/18 ,  H04L27/00 ,  H04L27/233

CPC分类号： H04H40/18 ,  H04L27/2332 ,  H04H20/34 ,  H04H2201/13 ,  H04L2027/0057

摘要： In a circuit for a demodulator of a radio data signal in a radio receiver, the multiplex signal in digital form is mixed into the baseband, in two phase positions shifted 90.degree. with respect to each other, after band-pass filtering, together with a reference carrier generated at a sampling clock rate produced in the radio receiver, thus producing a first and a second mix signal. A first and a second auxiliary signal with, respectively, a sine waveform and a cosine waveform are produced. The first mix signal is multiplied by the first auxiliary signal, and the second mix signal by the second auxiliary signal. The results of these multiplications are added together, producing a first output signal. The first mix signal is multiplied by the second auxiliary signal, and the second mix signal by the first auxiliary signal, and the results subtracted from each other, thus producing a second output signal. The phase position of the auxiliary signals is controlled in such a manner that the first output signal corresponds to the radio data signal (RDS) shifted down into the baseband.

摘要翻译： 在无线电接收机中用于无线电数据信号的解调器的电路中，数字形式的多路复用信号在带通滤波之后相对于彼此偏移90°的两个相位位置混合到基带中，以及 以在无线电接收机中产生的采样时钟速率产生的参考载波，从而产生第一和第二混合信号。 产生分别具有正弦波形和余弦波形的第一和第二辅助信号。 第一混合信号乘以第一辅助信号，第二混合信号乘以第二辅助信号。 将这些乘法的结果相加在一起，产生第一个输出信号。 第一混合信号乘以第二辅助信号，第二混合信号乘以第一辅助信号，并将结果彼此相减，从而产生第二输出信号。 以这样的方式控制辅助信号的相位位置，使得第一输出信号对应于向下移入基带的无线电数据信号（RDS）。

公开(公告)号：US5436591A

公开(公告)日：1995-07-25

申请号：US290756

申请日：1994-08-17

申请人： Werner Henze

发明人： Werner Henze

IPC分类号： H03D3/04 ,  H04H20/34 ,  H04H40/18 ,  H03D3/00 ,  H04H1/00

CPC分类号： H04H40/18 ,  H03D3/04 ,  H04H20/34 ,  H04H2201/13

摘要： In a demodulator for radio data signals the transmission of which is made by phase-keying of a suppressed subcarrier the occurence of transient times is avoided in that the received signal of subcarrier frequency is transformed into a first square wave signal (A) and that a second square wave signal of subcarrier of frequency is formed which is brought into such a time relationship to the first square wave signal that by means of a comparison of both square wave signals a phase information for the first square wave signal (A) is obtained. Demodulator can be implemented by means of only digital components.

摘要翻译： PCT No.PCT / DE93 / 00158 Sec。 371日期：1994年8月17日 102（e）日期1994年8月17日PCT提交1993年2月18日PCT公布。 第WO93 / 17509号公报 日期：1993年9月2日。在用于无线电数据信号的解调器中，通过抑制子载波的相位锁定来进行发送，避免了发生瞬时时间，因为副载波频率的接收信号被变换为第一方波 信号（A），并且形成频率副载波的第二方波信号，其与第一方波信号形成时间关系，通过两个方波信号的比较，第一方波的相位信息 信号（A）。 解调器只能通过数字元件实现。

公开(公告)号：US5315583A

公开(公告)日：1994-05-24

申请号：US684529

申请日：1991-04-11

申请人： John L. Murphy ,  Mark J. Rich

发明人： John L. Murphy ,  Mark J. Rich

IPC分类号： H04H20/31 ,  H04H20/95 ,  H04H40/18 ,  H04H40/54 ,  H04H60/07 ,  H04L1/00 ,  H04L27/26 ,  H04J13/00

CPC分类号： H04L1/0071 ,  H04H20/31 ,  H04H20/95 ,  H04H40/18 ,  H04H60/07 ,  H04L27/2602 ,  H04L27/2657 ,  H04L27/2675 ,  H04H2201/183 ,  H04H40/54 ,  H04L1/0057 ,  H04L2001/0093

摘要： A radio broadcasting system for a composite signal consisting of a frequency modulated (fm) analog signal and a multicarrier modulated digital signal is provided which is resistive to multipath degradation. The fm signal and the digital multicarrier modulated signal are fully coherent. The digital signal uses a plurality of carriers having a maximum amplitude at least 20 dB below the unmodulated fm signal. The multicarrier modulated signal is phase locked to a recovered analog fm pilot tone in the composite baseband spectrum of the fm signal which is at least 20 dB above the multicarrier modulated signal, which enables rapid and reliable acquisition of signal for coherent detection. In a specific embodiment the multicarrier modulated signal is a synthesized vector-modulated signal which is a quadrature phase shift keyed (QPSK) modulated set of synthesized carriers each occupying 9.5 kHz of spectrum replicated twenty-one times within a 199.5 kHz bandwidth with no more than two bits per vector. An efficient channel coding consisting of high efficiency block coding, such as BCH 255, 239 code, is employed in connection with time interleaving of bits to mitigate the effects of frequency selective multipath and broadband multipath. The broadcast system is designed to be used in support of compressed digital audio programming material. In demodulation, a demodulator is phased-locked to the recovered high-amplitude analog pilot tone to coherently demodulate the digital signal, to deinterleave, to decode the block encoded signal and to format the recovered data stream for source decoding.

摘要翻译： 提供了一种用于由频率调制（fm）模拟信号和多载波调制数字信号组成的复合信号的无线电广播系统，其对多径降级具有阻力。 fm信号和数字多载波调制信号是完全相干的。 数字信号使用具有比未调制的fm信号低至少20dB的最大幅度的多个载波。 多载波调制信号被锁定到fm信号的复合基带频谱中的恢复的模拟fm导频音，其在多载波调制信号之上至少20dB，这使得能够快速可靠地获取用于相干检测的信号。 在具体实施例中，多载波调制信号是合成矢量调制信号，它是一个合成载波的正交相移键控（QPSK）调制集合，每个合成载波在199.5kHz带宽内占据复制二十一次频谱的9.5kHz频谱，不超过 每个矢量两位。 与诸如BCH 255,239码之类的高效率块编码组合的有效信道编码被用于与时间交织比特相结合以减轻频率选择性多路径和宽带多径的影响。 广播系统设计用于支持压缩数字音频编程材料。 在解调中，解调器被锁相到恢复的高幅度模拟导频音，以相干地解调数字信号，去交织，解码块编码信号，并格式化恢复的数据流以进行源解码。

公开(公告)号：US5195109A

公开(公告)日：1993-03-16

申请号：US650042

申请日：1991-02-04

申请人： Harald Bochmann ,  Henrik Schulze ,  Joachim Hagenauer ,  Peter Hoher

发明人： Harald Bochmann ,  Henrik Schulze ,  Joachim Hagenauer ,  Peter Hoher

IPC分类号： H04B1/10 ,  H04B1/26 ,  H04H40/18

CPC分类号： H04H40/18

摘要： A novel receiver for subcarriers in a radio broadcasting system is described, in which the characteristic frequency of the mixing oscillator is varied under program control. An incoming signal from antenna 1 passes through an input stage 2 to a mixing stage 3. Mixing stage 3 receives the output of an oscillator 4. The output of the mixing stage passes into an intermediate frequency filter stage 5, which preferably includes A/D converters 13 and demultiplexers 14. Stage 5 feeds a plurality of demodulators 6, which may include equalizers 12. Buffer memories 7 store information from demodulated subcarrier signals, and feed an evaluation unit 8. Evaluation unit 8 has a first output which drives a speaker 9 and a second output which is applied to a memory 11. A control unit 10, connected to the output of memory 11, controls the frequency generated by mixing oscillator 4. This system facilitates digital signal transmission by compensating for poor transmission conditions which would otherwise cause serious dropouts in the digital signal.

摘要翻译： 描述了在无线电广播系统中用于副载波的新型接收机，其中混频振荡器的特征频率在程序控制下变化。 来自天线1的输入信号通过输入级2到混合级3.混合级3接收振荡器4的输出。混合级的输出进入中频滤波器级5，其优选地包括A / D 转换器13和解复用​​器14.阶段5馈送多个解调器6，其可以包括均衡器12.缓冲存储器7存储来自解调的子载波信号的信息，并馈送评估单元8.评估单元8具有驱动扬声器9的第一输出 以及施加到存储器11的第二输出。连接到存储器11的输出的控制单元10控制由混频振荡器4产生的频率。该系统通过补偿不利的传输条件来促进数字信号传输，否则将导致 严重的数字信号丢失。

公开(公告)号：US5023933A

公开(公告)日：1991-06-11

申请号：US257512

申请日：1988-10-13

申请人： Frank P. Karkota, Jr.

发明人： Frank P. Karkota, Jr.

IPC分类号： H04B1/16 ,  H04H20/34 ,  H04H40/18

CPC分类号： H04B1/1646 ,  H04H20/34 ,  H04H40/18

摘要： An SCA receiver is provided which has a close to ideal passband characteristic which greatly improves frequency response to produce a brighter sound due to the use of ceramic resonator elements. The use of ceramic resonator elements and a superheterodyne approach also provides a receiver which can be rapidly aligned and which has improved noise protection, lower distortion, increased stability, less residual subcarrier in the audio, and more consistent performance from one unit to the next. In one embodiment the superheterodynes circuit operates at 455 kHz which up-converts the usual 67 kHz signal by mixing it with the output of a ceramic resonator controlled local oscillator/mixer. The ceramic resonator and ceramic filter along with the local oscillator/mixer I.C. provides low group delay, improved impulse noise rejection, while most importantly achieving at least an order of magnitude better audio response over the signal bandwidth. Moreover, in the manufacturing process, complicated alignment is eliminated which decreases the alignment time from as much as two hours to typically under two minutes.

摘要翻译： 提供了具有接近理想通带特性的SCA接收机，由于使用了陶瓷谐振器元件，极大地改善了频率响应以产生更亮的声音。 使用陶瓷谐振器元件和超外差方法还提供了可以快速对准的接收器，其具有改进的噪声保护，更低的失真，增加的稳定性，更少的音频中的残余副载波，以及从一个单元到下一个单元的更一致的性能。 在一个实施例中，超外差电路工作在455kHz，其通过将其与陶瓷谐振器受控的本地振荡器/混频器的输出混合来对通常的67kHz信号进行上变频。 陶瓷谐振器和陶瓷滤波器以及本地振荡器/混频器I.C. 提供低群延迟，改善脉冲噪声抑制，而最重要的是在信号带宽上实现至少一个数量级的音频响应。 此外，在制造过程中，消除了复杂的对准，其将对准时间从多达两个小时缩短到通常在两分钟之内。

公开(公告)号：US5001728A

公开(公告)日：1991-03-19

申请号：US235111

申请日：1988-08-23

申请人： Friedrich Fu/ ldner

发明人： Friedrich Fu/ ldner

IPC分类号： H03M5/12 ,  H04H20/34 ,  H04H40/18

CPC分类号： H04H20/34 ,  H03M5/12 ,  H04H40/18 ,  H04H2201/13

摘要： A binary encoded phase modulated signal (biphase signal) is demodulated by determining the period of time (T) elapsing between each two successive jumps in the level of the biphase signal; providing a clock frequency (B) approximately corresponding to the bit rate of the biphase signal with the aid of a clock generator; comparing the clock duration (1/B) of the clock frequency with the period of time (T) between each two jumps in level; and, with the aid of a sample and hold circuit controlled by the clock frequency (B), always ascertaining the logical value of the biphase signal and emitting a signal corresponding to the logical value whenever, immediately prior to a bit period, twice in succession, a value between 1/4 and 3/4 of 1/B is ascertained for the period of time (T), or a value between 3/4 and 5/4 of 1/B is ascertained for the period of time (T). Additionally, a signal characterizing interference can be emitted, or the output can be suppressed, if a value less than 1/4 of 1/B or greater than 5/4 of 1/B is ascertained as the period of time (T). This makes it possible, in the presence of a biphase signal, to recover the original data with high security in a relatively simple manner.

摘要翻译： 二值编码相位调制信号（双相信号）通过确定双相信号电平中每两个连续跳变之间经过的时间（T）来解调; 借助于时钟发生器提供近似对应于双相信号比特率的时钟频率（B）; 将时钟频率的时钟持续时间（1 / B）与每两个跳跃之间的时间段（T）进行比较; 并且借助于由时钟频率（B）控制的采样和保持电路，总是确定双相信号的逻辑值并发出与逻辑值相对应的信号，每当紧接在位周期之前，连续两次 ，确定1 / B的1/4和3/4之间的值（T），或者确定1 / B的3/4和5/4之间的值（T ）。 另外，如果确定小于1 / B的1/4或1 / B的5/4以上的值作为时间段（T），则可以发出表征干扰的信号，或者可以抑制输出。 这使得在存在双相信号的情况下可以以相对简单的方式以高安全性恢复原始数据成为可能。

公开(公告)号：US4969209A

公开(公告)日：1990-11-06

申请号：US212863

申请日：1988-06-29

申请人： Pierre R. Schwob

发明人： Pierre R. Schwob

IPC分类号： H04B1/06 ,  H03J1/00 ,  H04B1/16 ,  H04H40/18 ,  H04H60/51 ,  H04N5/44 ,  H04N5/50 ,  H04N7/088

CPC分类号： H04N7/0887 ,  H03J1/0075 ,  H04H40/18 ,  H04N5/44 ,  H04H60/51 ,  H04N5/50

摘要： A broadcast receiver is capable of selecting a broadcast station based upon a user selected program format and the geographical location of the receiver. The receiver includes a memory storing a database of information relating to frequencies of broadcast stations broadcasting into particular geographical locations and the program format of each such broadcast frequency. After a user inputs the geographical location of the receiver and a desired program format, the database may be scanned to select a broadcast frequency corresponding to the input geographical location and program format for retrieval. This selected frequency is used to tune the receiver. The geographical location, identification information, and program format for the selected frequency are then visually displayed.

公开(公告)号：US4393273A

公开(公告)日：1983-07-12

申请号：US226561

申请日：1981-01-19

申请人： Theodoor A. C. M. Claasen ,  Gerardus C. M. Gielis ,  Johan M. Schmidt ,  Harry B. Schoonheijm

发明人： Theodoor A. C. M. Claasen ,  Gerardus C. M. Gielis ,  Johan M. Schmidt ,  Harry B. Schoonheijm

IPC分类号： H04H20/34 ,  H04H40/18 ,  H04J1/00 ,  H04L7/027 ,  H04L7/033 ,  H04H5/00

CPC分类号： H04L7/0337 ,  H04H20/34 ,  H04H40/18 ,  H04L7/033

摘要： An FM-receiver with transmitter characterization, having a tuning unit, an IF-amplifier, a demodulation circuit for demodulating a discrete transmitter characterization signal, a clock regeneration circuit, a decoding device for decoding the discrete transmitter characterization signal and a signal processing unit. The clock regeneration circuit regenerates a clock signal the period of which is obtained by dividing the frequency of the stereo pilot signal. Synchronization of the clock signal phase with the phase of the clock signal used in the transmitter is carried out by detecting, using of a periodic window signal, the average phase of the code edges in the discrete transmitter characterization signal and by choosing the phase of the regenerated clock signal to be equal thereto.

摘要翻译： 具有发射机表征的FM接收机，具有调谐单元，IF放大器，用于解调离散发射机表征信号的解调电路，时钟再生电路，用于解码离散发射机表征信号的解码装置和信号处理单元。 时钟再生电路通过对立体声导频信号的频率进行分频而获得周期的时钟信号。 时钟信号相位与发射机中使用的时钟信号的相位的同步通过使用周期性窗口信号来检测离散发射机表征信号中的码边缘的平均相位并通过选择相位 再生时钟信号等于其。