公开(公告)号：US06590944B1

公开(公告)日：2003-07-08

申请号：US09261468

申请日：1999-02-24

申请人： Brian William Kroeger

发明人： Brian William Kroeger

IPC分类号： H03D100

CPC分类号： H04H20/30 ,  H04H60/11 ,  H04H2201/20

摘要： A method is provided for processing a composite digital audio broadcast signal to mitigate intermittent interruptions in the reception of said digital audio broadcast signal. The method includes the steps of separating an analog modulated portion of the digital audio broadcast signal from a digitally modulated portion of the digital audio broadcast signal, producing a first plurality of audio frames having symbols representative of the analog modulated portion of the digital audio broadcast signal, and producing a second plurality of audio frames having symbols representative of the digitally modulated portion of the digital audio broadcast signal. The first plurality of audio frames is then combined with the second plurality of audio frames to produce a blended audio output. A method is also provided for transmitting a composite digital audio broadcast signal having an analog portion and a digital portion to mitigate intermittent interruptions in the reception of said digital audio broadcast signal. The method comprises the steps of arranging symbols representative of the digital portion of the digital audio broadcast signal into a plurality of audio frames, producing a plurality of modem frames, each of the modem frames including a predetermined number of the audio frames, and adding a frame synchronization signal to each of the modem frames. The modem frames are then transmitted along with the analog portion of the digital audio broadcast signal, with the analog portion being delayed by a time delay corresponding to an integral number of the modem frames. The invention also encompasses radio receivers and transmitters which process signals according to the above methods.

摘要翻译： 提供一种用于处理复合数字音频广播信号以减轻接收所述数字音频广播信号的间歇性中断的方法。 该方法包括以下步骤：从数字音频广播信号的数字调制部分分离数字音频广播信号的模拟调制部分，产生具有表示数字音频广播信号的模拟调制部分的符号的第一多个音频帧 并且产生具有表示数字音频广播信号的数字调制部分的符号的第二多个音频帧。 然后将第一组多个音频帧与第二多个音频帧组合以产生混合音频输出。 还提供一种用于发送具有模拟部分和数字部分的复合数字音频广播信号以减轻接收所述数字音频广播信号的间歇性中断的方法。 该方法包括以下步骤：将代表数字音频广播信号的数字部分的符号排列成多个音频帧，产生多个调制解调器帧，每个调制解调器帧包括预定数量的音频帧， 帧同步信号到每个调制解调器帧。 然后，调制解调器帧与数字音频广播信号的模拟部分一起传输，其中模拟部分被延迟与整数个调制解调器帧相对应的时间延迟。 本发明还包括根据上述方法处理信号的无线电接收机和发射机。

公开(公告)号：US06577182B1

公开(公告)日：2003-06-10

申请号：US09868854

申请日：2001-08-27

申请人： Sébastien Morand

发明人： Sébastien Morand

IPC分类号： H03D100

CPC分类号： H03D1/18

摘要： A device for demodulating a modulated signal resulting from an amplitude modulation of a sinusoidal signal of frequency fo by a signal of frequency fm according to an unknown modulation rate, comprising a transistor (10) where the gate is connected to the modulated signal (Et) so as to obtain in the transistor (10) output a derived signal (St) equal to a power N of the modulated signal, N being an integer greater than 1, and a filter for selecting the frequency component fm in the transistor output signal. The device can be used to demodulate an amplitude-modulated signal received by a scanner of a system identifying contactless portable objects.

摘要翻译： 一种用于根据未知调制速率解调由频率fo的正弦信号的幅度调制产生的调制信号的频率fm的信号的装置，包括晶体管（10），其中栅极连接到调制信号（Et） 以便在晶体管（10）中获得等于调制信号的功率N的导出信号（St），N是大于1的整数，以及用于选择晶体管输出信号中的频率分量fm的滤波器。 该装置可以用于解调由识别非接触式便携式对象的系统的扫描器接收的幅度调制信号。

公开(公告)号：US06563888B1

公开(公告)日：2003-05-13

申请号：US09413224

申请日：1999-10-05

申请人： Hideyuki Toriyama

发明人： Hideyuki Toriyama

IPC分类号： H03D100

CPC分类号： H04N1/00931 ,  H04L7/0037 ,  H04L7/033 ,  H04L7/0331 ,  H04L7/044 ,  H04L2027/0036 ,  H04L2027/0067 ,  H04L2027/0083 ,  H04N1/32561 ,  H04N2201/0081 ,  H04N2201/0082

摘要： A data transmission/reception system made up of a transmission device for transmitting data according to a transmission clock signal and a reception device for receiving the data according to a reception clock signal. On receiving synchronization data representing the transmission clock signal from the transmission device, the reception device generates the reception clock signal which is synchronous to the transmission clock signal using a PLL circuit, and notifies the transmission device of an input voltage applied to a VCO in the PLL circuit on completing PLL processing. The transmission device adjusts a frequency of the transmission clock signal based on the notified input voltage so that the reception clock signal will be synchronized to the transmission clock signal at a median frequency in a synchronous range of the VCO in the PLL circuit. The reception device samples image data transmitted from the transmission device, in accordance with the reception clock signal which is synchronous to the transmission clock signal of the adjusted frequency.

摘要翻译： 一种由根据传输时钟信号发送数据的发送装置和根据接收时钟信号接收数据的接收装置构成的数据发送/接收系统。 接收装置接收到表示来自发送装置的发送时钟信号的同步数据时，使用PLL电路生成与发送时钟信号同步的接收时钟信号，并向发送装置通知施加到VCO的输入电压 PLL电路完成PLL处理。 发送装置根据所通知的输入电压来调整发送时钟信号的频率，使得接收时钟信号以PLL电路中的VCO的同步范围内的中频为同步发送时钟信号。 接收装置根据与调整后的频率的发送时钟信号同步的接收时钟信号，对发送装置发送的图像数据进行采样。

公开(公告)号：US06556633B2

公开(公告)日：2003-04-29

申请号：US10033604

申请日：2001-11-02

申请人： Francesco Brianti ,  Marco Demicheli

发明人： Francesco Brianti ,  Marco Demicheli

IPC分类号： H03D100

CPC分类号： G11B20/10009 ,  G11B20/1403 ,  H04L7/0062 ,  H04L7/0066 ,  H04L7/0083 ,  H04L7/0334 ,  H04L25/03178 ,  H04L25/497

摘要： A partial response Class 4 detector in a recording and retrieval system and method of operating the detector for correcting the timing error of the detector. The detector includes a sequence table and comparison circuitry for comparing a sequence of data samples that includes previous and subsequent data samples with allowed sequences determined from the sequence table. When the sequence is an allowed sequence then there is high likelihood that data sample is correct, and the timing error for the data sample is determined in the phase error estimator and is corrected for. Otherwise, no correction is made for the timing error. In the preferred embodiment of the invention the coordinates of the sequence table correspond to the data samples, and the slope of the data stream at the data sample is stored in the sequence table. This reduces the size and increases the speed of the phase error estimator since the slope is now provided to it from the sequence table and it does not need determine the slope.

公开(公告)号：US06553082B2

公开(公告)日：2003-04-22

申请号：US09960938

申请日：2001-09-25

申请人： Bruno Jechoux ,  Marian Rudolf

发明人： Bruno Jechoux ,  Marian Rudolf

IPC分类号： H03D100

CPC分类号： H04L25/0226 ,  H04B7/0851 ,  H04L25/0228

摘要： The present invention concerns a channel estimation sequence (SE) intended to be transmitted by a transmitter (1) to a receiver (2) via a channel (3) so that it can implement a channel estimation method, the said channel estimation sequence consisting of two concatenated sequences (S and G) respectively consisting of two complementary sequences (s and g), the said channel estimation method consisting, on the transmitter side, of transmitting the said channel estimation sequence and, on the receiver side, of a correlation process consisting of correlating the said received signal with the first (s) of the said complementary sequences, correlating the said received signal with the second (g), delayed one, of the said complementary sequences, adding the results of the said two correlations, and deducing the said characteristics of the said channel (3) from the result of the said correlation process.  According to the present invention, the said two complementary sequences (s and g) are extended periodically by extensions (esf, esd and egf, egd) which constitute replicas of their starting part and/or ending part and which are respectively concatenated at the end and/or start of the sequence.  The present invention also concerns a channel estimation method which uses such a channel estimation sequence.

公开(公告)号：US06519299B1

公开(公告)日：2003-02-11

申请号：US09256347

申请日：1999-02-24

申请人： Chung Wei-Ku ,  Fu-Yen Kuo

发明人： Chung Wei-Ku ,  Fu-Yen Kuo

IPC分类号： H03D100

CPC分类号： H04J13/0077 ,  H04B1/709

摘要： A correlator and matched filter for use with coded transmission, such as CDMA, form new codes from the sums and differences of the original codes, where only one of the new codes is non-zero for each element position and effect hardware savings using the new codes.

公开(公告)号：US06507619B1

公开(公告)日：2003-01-14

申请号：US09535902

申请日：2000-03-24

申请人： John S. Thomson ,  Paul J. Husted

发明人： John S. Thomson ,  Paul J. Husted

IPC分类号： H03D100

CPC分类号： H03M13/6325 ,  H03M13/25 ,  H03M13/2707 ,  H03M13/4169 ,  H03M13/6502 ,  H04L1/0054 ,  H04L27/38

摘要： A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than binary valued parameters. It performs the Viterbi algorithm using these many-valued parameters to provide results superior to hard decision decoding. Rather than applying a hard 0-1 function to the QAM data, the system uses a non-stepped linear or curved transfer function to assign values to the bits. This results in performance superior to pure hard decision decoding and approaches that of soft decision decoding; moreover, it is applicable in many situations where soft decision decoding cannot be used.

摘要翻译： 维特比解码系统将接收的QAM星座中的比特解释为多值参数，而不是二进制值参数。 它使用这些多值参数来执行维特比算法，以提供优于硬判决解码的结果。 系统使用非阶梯线性或弯曲传递函数来向位指定值，而不是将硬0-1函数应用于QAM数据。 这导致性能优于纯硬判决解码和软判决解码的方法; 此外，它适用于许多软判决解码不能使用的情况。

公开(公告)号：US06504882B1

公开(公告)日：2003-01-07

申请号：US09397756

申请日：1999-09-16

申请人： Yong-Chan Kim

发明人： Yong-Chan Kim

IPC分类号： H03D100

CPC分类号： H04L1/0059 ,  H03M13/093 ,  H03M13/4107 ,  H03M13/4169 ,  H03M13/6362 ,  H03M13/6516 ,  H04L1/0054 ,  H04L1/0069

摘要： There is provided a viterbi decoder for decoding convolutional data. The convolutional data includes punctured data and non punctured data. The decoder includes a branch metric unit for calculating branch metrics of the received convolutional data. An add-compare-select unit selects current and next path selection information and calculates a current state metric and a next state metric of the punctured data, from the branch metrics and a previous state metric. A traceback unit traces the current and the next path selection information selected in the add-compare-select unit to find a maximum likelihood path from which the convolutional data was received, and outputs decoded data. A controller generates a plurality of decoding control signals to the branch metric unit, the add-compare-select unit, and the traceback unit.

摘要翻译： 提供了一种用于对卷积数据进行解码的维特比解码器。 卷积数据包括打孔数据和非打孔数据。 解码器包括用于计算接收的卷积数据的分支度量的分支度量单位。 加法比较选择单元从分支度量和先前的状态度量中选择当前和下一路径选择信息并计算打孔数据的当前状态度量和下一状态度量。 回溯单元跟踪在加法比较选择单元中选择的当前和下一个路径选择信息，以找到从其接收卷积数据的最大似然路径，并输出解码数据。 控制器产生多个解码控制信号到分支度量单元，加法比较选择单元和回溯单元。

公开(公告)号：US06493405B1

公开(公告)日：2002-12-10

申请号：US09260238

申请日：1999-03-02

申请人： David A. Olaker ,  Greg P. Segallis

发明人： David A. Olaker ,  Greg P. Segallis

IPC分类号： H03D100

CPC分类号： H04B1/709 ,  H04B1/69 ,  H04B2001/6912

摘要： A correlator includes a circuit for serially receiving in phase (I) and quadrature (Q) signal data along parallel I and Q signal channels and converting the data to blocks of n bit parallel I and n bit parallel Q signal data. At least one programmable read only memory (PROM) stores I and Q reference data. The memory receives and stores within each respective parallel I and Q signal channel a current block of n bit parallel I and n bit parallel Q signal data and the immediately previous received blocks of n bit parallel I and n bit parallel Q signal data. A data bus receives the n bit parallel I and Q reference data and the n bit parallel I and Q signal data. The n bit parallel I and Q reference data are correlated with a one bit shifted version of the respective n bit parallel I and Q signal data from an adjacent previous path to produce a correlated I component signal output and a correlated Q component signal output.

摘要翻译： 相关器包括沿着并行I和Q信号通道串行接收同相（I）和正交（Q）信号数据的电路，并将数据转换成n位并行I和n位并行Q信号数据的块。 至少一个可编程只读存储器（PROM）存储I和Q参考数据。 存储器在每个相应的并行I和Q信号通道内接收并存储n位并行I和n位并行Q信号数据的当前块以及n位并行I和n位并行Q信号数据的紧接在前的接收块。 数据总线接收n位并行I和Q参考数据以及n位并行I和Q信号数据。 n位并行I和Q参考数据与来自相邻先前路径的相应n位并行I和Q信号数据的一位移位版本相关，以产生相关I分量信号输出和相关Q分量信号输出。

公开(公告)号：US06480555B1

公开(公告)日：2002-11-12

申请号：US09388666

申请日：1999-09-02

申请人： Kenneth A. Renard ,  Priya S. Nadathur ,  James C. Baker ,  Alexander W. Hietala

发明人： Kenneth A. Renard ,  Priya S. Nadathur ,  James C. Baker ,  Alexander W. Hietala

IPC分类号： H03D100

CPC分类号： H04L7/04 ,  H04L27/14 ,  H04L2007/047

摘要： A radio communication device provides extended burst tone detection for a demodulated I and Q input signal. The device includes a first burst detector coupled with the input signal and provides a first detection signal when a FCB tone is detected. A frequency shifter is coupled with the input signal and frequency translates the input signal by a predetermined amount. A second burst detector is coupled with the translated input signal and provides a second detection signal when a FCB tone is detected. A combiner is coupled with the first and second detection signals and indicates FCB tone detection when either of the first and second detection signals indicate FCB tone detection.

摘要翻译： 无线电通信设备为解调的I和Q输入信号提供扩展的突发音检测。 该装置包括与输入信号耦合的第一突发检测器，并且当检测到FCB音时提供第一检测信号。 频率移位器与输入信号耦合，频率将输入信号转换预定量。 第二突发检测器与转换的输入信号耦合，并且当检测到FCB音时提供第二检测信号。 组合器与第一和第二检测信号耦合，并且当第一和第二检测信号中的任一个指示FCB音检测时，指示FCB音检测。