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1. 发明授权

US06269134B1 Data transmission method and apparatus in pulse amplitude modulation communication system 失效
标题翻译：脉冲幅度调制通信系统中的数据传输方法和装置
公开(公告)号：US06269134B1
公开(公告)日：2001-07-31
申请号：US09119740
申请日：1998-07-21
申请人： Young-Bin Yoon , Ki-Jo Kwon
发明人： Young-Bin Yoon , Ki-Jo Kwon
IPC分类号： H03K702
CPC分类号： H04L25/45 , H03K7/02
摘要： A data transmission apparatus and method in a pulse amplitude modulation (PAM) communication system that converts information to be transmitted into digital data, converts the digital signal into an analog signal, modulates the analog signal using a PAM modulator, and transmits the signal through a predetermined transmission channel. The method includes detecting distortion in the signal to be transmitted to the transmission channel; generating compensation information corresponding to the distortion detected; and changing digital data to be input to the PAM modulator based upon the compensation information generated.
摘要翻译：在将要发送的信息转换成数字数据的脉冲幅度调制（PAM）通信系统中的数据发送装置和方法，将数字信号转换为模拟信号，使用PAM调制器调制模拟信号，并通过一个预定的传输通道。该方法包括检测待发送到传输信道的信号中的失真; 产生与检测到的失真相对应的补偿信息; 以及基于生成的补偿信息来改变要输入到PAM调制器的数字数据。

2. 发明授权

US06650717B1 Asymmetric pulse amplitude modulation transmission of multi-stream data embedded in a hybrid IBOC channel 有权
标题翻译：嵌入在混合IBOC通道中的多流数据的非对称脉冲幅度调制传输
公开(公告)号：US06650717B1
公开(公告)日：2003-11-18
申请号：US09293851
申请日：1999-04-19
申请人： Robert Louis Cupo , Mohsen Sarraf , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
发明人： Robert Louis Cupo , Mohsen Sarraf , Mojtaba Shariat , Mohammad Hossein Zarrabizadeh
IPC分类号： H03K702
CPC分类号： H03K7/02 , H04H20/30 , H04H2201/186 , H04L5/06 , H04L27/02
摘要： In accordance with the principles of the present invention, in addition to conventional use of frequency division multiplexed upper and lower side bands, the spectral area occupied by the analog host will be utilized by applying a one-dimensional modulation, e.g., pulse amplitude modulation (PAM) as opposed to the conventional use of a two-dimensional modulation, e.g., quadrature amplitude modulation (QAM). Furthermore, the analog and digital information within the analog host bandwidth may be combined in quadrature to keep the signals orthogonal. Thus, should one side band under the analog carrier be deteriorated or obliterated by adjacent channel interference, the other side band under the analog carrier can still provide useful data and hence better digital audio codec performance. By transmitting one or two digital data streams asymmetrically with respect to the center frequency, particular digital side bands can be rendered useless as environmental conditions warrant (e.g., as they become detrimentally affected by adjacent channel interference), reducing bandwidth capacity but not affecting the quality of the received digital data transmitted in any of the remaining digital side band regions.
摘要翻译：根据本发明的原理，除了常规使用频分多路复用的上下边频带之外，通过应用一维调制（例如，脉冲幅度调制（ PAM），与常规使用二维调制（例如正交幅度调制（QAM））相反。此外，模拟主机带宽内的模拟和数字信息可以被正交组合以保持信号正交。因此，如果模拟载波下的一个边带被相邻信道干扰恶化或消除，则模拟载波下的另一个边带仍然可以提供有用的数据，从而提供更好的数字音频编解码器性能。通过相对于中心频率不对称地发送一个或两个数字数据流，在环境条件允许的情况下（例如，当它们受到相邻信道干扰的不利影响）时，特定的数字边带可能变得无用，减少带宽容量但不影响质量在任何剩余的数字边带区域中发送的接收数字数据。

3. 发明授权

US06784711B2 Sequential pulse train generator 有权
公开(公告)号：US06784711B2
公开(公告)日：2004-08-31
申请号：US10600785
申请日：2003-06-19
申请人： Jian-Shen Yu
发明人： Jian-Shen Yu
IPC分类号： H03K702
CPC分类号： G11C19/184 , G09G3/3677 , G09G2310/0289 , G09G2330/021 , G11C19/00 , G11C19/28
摘要： A sequential pulse train generator. Each stage of the sequential pulse train generator includes a dynamic shift register circuit, level shifter, and buffer composed of inverters. The dynamic shift register circuits, allow the pulse generator to operate with a low-voltage clock signal so that power consumption in transmission of the clock signal is reduced.

4. 发明授权

US06617938B1 Return to zero and sampling pulse generating circuits and method for direct digital up conversion 有权
标题翻译：返回零和采样脉冲发生电路和直接数字上转换的方法
公开(公告)号：US06617938B1
公开(公告)日：2003-09-09
申请号：US10113279
申请日：2002-04-01
申请人： James J. Komiak
发明人： James J. Komiak
IPC分类号： H03K702
CPC分类号： H03C1/02
摘要： Direct up-conversion of a signal is accomplished using a sampling pulse generator circuit and a gated differential amplifier, enabled by the sampling signal. When not enabled, the output of the differential amplifier is pulled to zero. The sampling pulse is generated from a base frequency sine wave which is squared with a limiting amplifier, and further passed through one or more frequency doublers producing a times two signal, a times four signal and so on. The squared base frequency and frequency doubled signals are logically ORed to produce a short duration pulse which repeats at the frequency of the base signal. The resulting output is an amplitude modulated pulse doublet time domain waveform.
摘要翻译：信号的直接上变频是通过采样脉冲发生器电路和门控差分放大器完成的，该差分放大器由采样信号使能。当不使能时，差分放大器的输出被拉至零。采样脉冲由与限幅放大器平方的基频正弦波产生，并进一步通过一个或多个产生二次信号，四次信号等的倍频器。平方的基频和倍频信号被逻辑或运算以产生在基信号的频率处重复的短持续时间脉冲。所得到的输出是幅度调制脉冲双频时域波形。

5. 发明授权

US06430226B1 Repeated decoding and encoding in subband encoder/decoders 失效
标题翻译：在子带编码器/解码器中重复解码和编码
公开(公告)号：US06430226B1
公开(公告)日：2002-08-06
申请号：US08738990
申请日：1996-10-24
申请人： Warner R. T. Ten Kate
发明人： Warner R. T. Ten Kate
IPC分类号： H03K702
CPC分类号： H04B1/667 , G06T9/007
摘要： An encoding apparatus is provided for encoding a wideband digital signal, including an input for receiving the wideband digital signal, a splitter unit for splitting the wideband digital signal into a number of M sub signals, a data reduction unit for data reducing the sub signals and a formatting unit for assembling digital information including the data reduced sub signals into a digital output signal having a format suitable for transmission or storage. During a repeated encoding and decoding of a wideband digital signal in a subband encoding/decoding system or a transform encoding/decoding system, signal degradation may occur. In order to avoid this, the apparatus further including a variable delay unit coupled between the input and the splitter for realizing a delay, the length of which is controlled by a control signal, and a control signal generator unit for generating the control signal.
摘要翻译：提供了一种编码装置，用于对包括用于接收宽带数字信号的输入端的宽带数字信号进行编码，用于将宽带数字信号分割为多个M个子信号的分离器单元，用于减少子信号的数据的数据缩减单元，以及格式化单元，用于将包括数据简化的子信号的数字信息组合成具有适于传输或存储的格式的数字输出信号。在子带编码/解码系统或变换编码/解码系统中的宽带数字信号的重复编码和解码期间，可能发生信号劣化。为了避免这种情况，该装置还包括耦合在输入和分路器之间的可变延迟单元，用于实现其长度由控制信号控制的延迟，以及用于产生控制信号的控制信号发生器单元。

6. 发明授权

US06608874B1 Method and apparatus for quadrature multi-pulse modulation of data for spectrally efficient communication 失效
标题翻译：用于频谱高效通信的数据的正交多脉冲调制方法和装置
公开(公告)号：US06608874B1
公开(公告)日：2003-08-19
申请号：US09005469
申请日：1998-01-12
申请人： Bassel F. Beidas , A. Roger Hammons, Jr.
发明人： Bassel F. Beidas , A. Roger Hammons, Jr.
IPC分类号： H03K702
CPC分类号： H04L27/18 , H03K7/02 , H04L25/03834
摘要： A modulator produces a modulated signal including a carrier and data signals representing data bits. The data signals include at least two in-phase modulating pulses which have different shapes and which are interfering in time and frequency; the data signals further include at least two quadrature modulating pulses which have different shapes and which are interfering in time and frequency. The modulator includes a filter for producing each shape of pulse, and combining circuits for combining the pulses with each other and with a carrier. The demodulator (or receiver) receives the combined signal and separates the pulses from the carrier. The demodulator further includes filters for separating the pulses, and a circuit for processing the pulses to reproduce the data bits. The processing circuit preferably includes one or more maximum likelihood sequence estimation equalizers.
摘要翻译：调制器产生包括载波的调制信号和表示数据位的数据信号。数据信号包括具有不同形状并且在时间和频率上干扰的至少两个同相调制脉冲; 数据信号还包括具有不同形状并且在时间和频率上干扰的至少两个正交调制脉冲。调制器包括用于产生每种脉冲形状的滤波器，以及用于组合脉冲彼此并与载体组合的电路。解调器（或接收器）接收组合信号并将脉冲与载波分离。解调器还包括用于分离脉冲的滤波器，以及用于处理脉冲以再现数据位的电路。处理电路优选地包括一个或多个最大似然序列估计均衡器。

7. 发明授权

US06535564B1 Adaptive quantization in a pulse-amplitude modulated system 有权
标题翻译：脉冲幅度调制系统中的自适应量化
公开(公告)号：US06535564B1
公开(公告)日：2003-03-18
申请号：US09343829
申请日：1999-06-30
申请人： Giridhar D. Mandyam
发明人： Giridhar D. Mandyam
IPC分类号： H03K702
CPC分类号： H03K7/02
摘要： A method and apparatus for adaptively quantizing a digital signal prior to digital-to-analog conversion during pulse shaping in a pulse-amplitude modulated (PAM) system. In the method and apparatus, scaling constants applied to the input signal prior to digital-to-analog conversion change according to the time-varying periodic probability density function (pdf) of the input signal. Spectral components added to the signal due to the adaptive scaling of the method may be removed by performing adaptive amplification on the output signal of the DAC before transmission as a PAM signal.
摘要翻译：一种用于在脉冲幅度调制（PAM）系统中的脉冲整形期间在数模转换之前自适应量化数字信号的方法和装置。在该方法和装置中，根据输入信号的时变周期性概率密度函数（pdf），施加到数模转换之前的输入信号的缩放常数变化。由于该方法的自适应缩放而添加到信号中的光谱分量可以通过在传输之前对DAC的输出信号执行自适应放大作为PAM信号来消除。

8. 发明授权

US06529569B1 Architecture for increasing density of channel bank in digital carrier system 失效
标题翻译：数字载波系统中信道库密度增加的体系结构
公开(公告)号：US06529569B1
公开(公告)日：2003-03-04
申请号：US09373655
申请日：1999-08-13
申请人： David O. Corp , Theodore A. Schweitzer , Erik G. Dragos
发明人： David O. Corp , Theodore A. Schweitzer , Erik G. Dragos
IPC分类号： H03K702
CPC分类号： H04Q1/10 , H04Q1/028 , H04Q1/15
摘要： A double density channel bank architecture compatible with an existing D4 backplane and D4 channel units transmits or receive PCM data on the PAM bus, while simultaneously transmitting or receiving PCM data on the PCM bus. A double density channel unit (CU) provides data for two transmit and two receive T-1 timeslots to increase the capacity of a D4 channel bank from 48 channels to 96 channels. Channel bank timing of PCM data on the PAM bus provides isolation of PCM data and PAM signals on PAM bus. Double density transmit and receive units each support an additional DS1. The receive unit transmits a signal on both CU channels to indicate T-1 failure and to commence trunk processing.
摘要翻译：与现有D4背板和D4通道单元兼容的双密度通道组架构在PAM总线上传输或接收PCM数据，同时在PCM总线上发送或接收PCM数据。双密度信道单元（CU）为两个发送和两个接收T-1时隙提供数据，以将D4信道组的容量从48个信道增加到96个信道。 PAM总线上的PCM数据的通道组定时提供PAM总线上PCM数据和PAM信号的隔离。双密度发送和接收单元每个都支持额外的DS1。接收单元在两个CU信道上发送信号以指示T-1故障并开始中继线处理。

9. 发明授权

US06198361B1 Contactless IC card system 有权
标题翻译：非接触式IC卡系统
公开(公告)号：US06198361B1
公开(公告)日：2001-03-06
申请号：US09327757
申请日：1999-06-07
申请人： Shigeru Arisawa
发明人： Shigeru Arisawa
IPC分类号： H03K702
CPC分类号： G06K7/0008 , G06K19/0723 , H03C1/08 , H03C1/14 , H03C1/36 , H03F3/72 , H03F2200/327 , H03F2203/7215 , H03K7/02 , H04L27/04 , H04L27/06
摘要： In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include first signal output means for outputting a first output signal having a predetermined phase with respect to that of an input signal, a second signal output means for outputting a second output signal having a predetermined phase with respect to that of the input signal, gate means for gating at least the second output signal, calculation means for adding, or subtracting the first output signal and the second output signal; and control means for controlling the operation of the gate means in response to a logic level of input data.
摘要翻译：在非接触IC卡系统中，以IC形式制造的调制电路以高功率效率工作。解调装置被配置为包括第一信号输出装置，用于输出相对于输入信号具有预定相位的第一输出信号;第二信号输出装置，用于输出具有预定相位的第二输出信号，所述输入信号，用于选通至少所述第二输出信号的门装置，用于相加或减去所述第一输出信号和所述第二输出信号的计算装置; 以及用于响应于输入数据的逻辑电平来控制门装置的操作的控制装置。

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