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133 条记录 (耗时 0.024 秒)

    VSB reception system
    26.
    发明授权
    VSB reception system 有权
    VSB接收系统

    公开(公告)号：US07324610B2

    公开(公告)日：2008-01-29

    申请号：US10614932

    申请日：2003-07-07

    申请人： Woo Chan Kim

    发明人： Woo Chan Kim

    IPC分类号： H03D1/24

    CPC分类号： H03D1/24

    摘要： VSB reception system with a frequency domain equalizer including a demodulating part for receiving, converting, and demodulating a signal, a frequency domain equalizing part for equalizing the demodulated signal for removing a distorted component from the demodulated signal, and a noise removing part for (a) receiving the equalized signal, (b) calculating a reference error signal that is a difference between the equalized signal and the signal having the noise removed therefrom, (c) calculating an error signal that is a difference between the reference error signal and the extracted noise signal, (d) renewing parameters with reference to the reference error signal and the error signal, and (e) calculating a difference between the equalized signal and the extracted noise signal, to provide a signal having the noise removed therefrom.

    摘要翻译： 具有频域均衡器的VSB接收系统，包括用于接收，转换和解调信号的解调部分，用于对解调信号进行均衡的频域均衡部分，用于从解调信号中去除失真分量;以及噪声去除部分，用于（ ）接收均衡信号，（b）计算作为均衡信号与去除噪声的信号之间的差的参考误差信号，（c）计算作为参考误差信号与提取的噪声信号之间的差的误差信号 噪声信号，（d）参考参考误差信号和误差信号更新参数，以及（e）计算均衡信号和提取的噪声信号之间的差异，以提供从其中去除噪声的信号。

    VSB receiver and carrier recovery apparatus thereof
    27.
    发明申请
    VSB receiver and carrier recovery apparatus thereof 有权
    VSB接收机和载波恢复装置

    公开(公告)号：US20050141645A1

    公开(公告)日：2005-06-30

    申请号：US11002874

    申请日：2004-12-01

    申请人： Joon Kim ,  Tok Kim

    发明人： Joon Kim ,  Tok Kim

    IPC分类号： H03D1/24 ,  H04L1/00 ,  H04L27/00 ,  H04L27/06 ,  H04L27/22 ,  H04N5/38 ,  H04N5/44 ,  H04N5/455

    CPC分类号： H04L27/066 ,  H03D1/24 ,  H04L1/004 ,  H04L2027/0028 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04L2027/0069 ,  H04L2027/0087 ,  H04N5/38 ,  H04N5/4401 ,  H04N5/455

    摘要： There are provided a VSB receiver and a carrier recovery apparatus thereof, in which a carrier is recovered using a VSB modulated signal. In the VSB receiver, a digital processing part selects a desired channel frequency through an antenna, converts the channel frequency into an intermediate frequency, and digitalizes the channel frequency by passing a predetermined band of the intermediate frequency. A carrier recovery part extracts pilot signals by using a first LPF having a first bandwidth and a second LPF having a second bandwidth, and recovers a baseband carrier wave signal from a passband signal by using one of the extracted pilot signals. A clock demodulation part removes the pilot signal from the baseband carrier wave signal and extracts a synchronizing signal. A noise removing part removes a linear noise and a residual phase jitter of the baseband signal by using the synchronizing signal. A decoding part decodes the baseband signal whose noise is removed. Accordingly, the carrier recovery can be stably performed even when the pilot signal is weak.

    摘要翻译： 提供了一种VSB接收机及其载波恢复装置，其中使用VSB调制信号来恢复载波。 在VSB接收机中，数字处理部通过天线选择期望的信道频率，将信道频率转换为中频，并通过中频的预定频带进行数字化。 载波恢复部分通过使用具有第一带宽的第一LPF和具有第二带宽的第二LPF来提取导频信号，并且通过使用所提取的导频信号之一从通带信号中恢复基带载波信号。 时钟解调部分从基带载波信号中去除导频信号并提取同步信号。 噪声去除部通过使用同步信号去除基带信号的线性噪声和残留相位抖动。 解码部分对噪声被去除的基带信号进行解码。 因此，即使导频信号弱，也能够稳定地进行载波恢复。

    Decimation of baseband DTV signals prior to channel equalization in digital television signal receivers
    28.
    再颁专利
    Decimation of baseband DTV signals prior to channel equalization in digital television signal receivers 失效
    在数字电视信号接收机的信道均衡之前抽取基带DTV信号

    公开(公告)号：USRE38456E1

    公开(公告)日：2004-03-09

    申请号：US09973825

    申请日：2001-10-11

    申请人： Chandrakant B. Patel ,  Allen LeRoy Limberg

    发明人： Chandrakant B. Patel ,  Allen LeRoy Limberg

    IPC分类号： H04N5455

    CPC分类号： H04N5/4446 ,  H03D1/24 ,  H03D5/00 ,  H04B1/28 ,  H04L1/0054 ,  H04L1/0071 ,  H04N5/4401 ,  H04N5/455

    摘要： A radio receiver uses the same tuner for receiving a selected digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal. The final IF signal is digitized at a rate that is a multiple of both the symbol frequencies of the QAM and VSB signals, for synchrodyning to baseband. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of the multiple of both the symbol frequencies of the QAM and VSB signals by applying automatic frequency and phase control (AFPC) signals developed in the digital circuitry to a local oscillator of the tuner. Baseband DTV signals obtained by synchrodyning the final IF signals have a sample rate higher than symbol rate to facilitate symbol synchronization. The baseband DTV signals are decimated to symbol rate before performing channel equalization to reduce the number of multipliers required in the channel equalization filter.

    Method and apparatus for pilot-aided carrier acquisition of vestigial sideband signal
    29.
    发明授权
    Method and apparatus for pilot-aided carrier acquisition of vestigial sideband signal 有权
    用于导航辅助载波采集残留边带信号的方法和装置

    公开(公告)号：US06665355B1

    公开(公告)日：2003-12-16

    申请号：US09391973

    申请日：1999-09-08

    申请人： Ting-Yin Chen ,  Ravi Bhaskaran ,  Christopher Keate ,  Kedar D. Shirali

    发明人： Ting-Yin Chen ,  Ravi Bhaskaran ,  Christopher Keate ,  Kedar D. Shirali

    IPC分类号： H03D124

    CPC分类号： H03D1/24

    摘要： An inexpensive synchronous detection module is disclosed for a sideband signal receiver that provides for flexibility in design of the tuner. The detection module is adaptable to detection of upper or lower sideband signals. One embodiment includes an analog-to-digital converter, a Hilbert transform filter, a sideband selection switch, a complex multiplier, a carrier recovery. loop, a matched filter, and a decimator. The analog-to-digital converter oversamples an intermediate frequency (IF) signal from the tuner, and the Hilbert transform filter generates a Hilbert transform of the digital IF signal. An analytic IF signal can be generated from the digital IF signal by multiplying the Hilbert transform of the digital IF signal by j(=sqrt(−1)), and adding the resulting imaginary-valued signal to the digital IF signal. The sideband selection switch can “flip” the analytic IF signal by inverting the imaginary-valued signal. The complex multiplier multiplies the analytic IF signal by a complex-value sinusoid to shift the analytic IF signal to baseband. The resulting analytic baseband signal is match filtered and decimated to form a baseband double sideband signal with one sample per symbol period. The carrier recovery loop operates on the imaginary part of the analytic baseband signal to generate the complex sinusoid that shifts the analytic IF signal to baseband.

    摘要翻译： 公开了一种边缘信号接收机的便宜的同步检测模块，其提供了调谐器设计的灵活性。 检测模块适用于检测上或下边带信号。 一个实施例包括模数转换器，希尔伯特变换滤波器，边带选择开关，复数乘法器，载波恢复。 循环，匹配滤波器和抽取器。 模数转换器从调谐器中抽取中频（IF）信号，希尔伯特变换滤波器产生数字IF信号的希尔伯特变换。 通过将数字IF信号的希尔伯特变换乘以j（= sqrt（-1）），并将产生的虚值信号与数字IF信号相加，可以从数字IF信号产生分析IF信号。 边带选择开关可以通过反相虚值信号来“翻转”分析IF信号。 复数乘法器将分析的IF信号乘以复数值正弦波，以将分析的IF信号移位到基带。 所得到的分析基带信号被匹配滤波和抽取以形成基带双边带信号，每个符号周期具有一个样本。 载波恢复循环在分析基带信号的虚部上运行，以产生将分析IF信号转换为基带的复数正弦波。

    Digital VSB detector with bandpass phase tracker using Ng filters, as for use in an HDTV receiver
    30.
    发明授权
    Digital VSB detector with bandpass phase tracker using Ng filters, as for use in an HDTV receiver 失效
    数字VSB检测器，带有使用Ng滤波器的带通相位跟踪器，用于HDTV接收机

    公开(公告)号：US5731848A

    公开(公告)日：1998-03-24

    申请号：US577469

    申请日：1995-12-22

    申请人： C. B. Patel ,  Allen LeRoy Limberg

    发明人： C. B. Patel ,  Allen LeRoy Limberg

    IPC分类号： H04N5/21 ,  H04N5/44

    CPC分类号： H04N5/4401 ,  H03D1/24 ,  H04L27/066 ,  H04L2027/0028 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04L2027/0087 ,  H04L27/063 ,  H04N5/21

    摘要： In a radio receiver for receiving vestigial sideband (VSB) signals including symbol codes descriptive of digital signals, HDTV signals being exemplary of such VSB signals, a tuner provides for selecting one of channels at different locations in a frequency band used for transmitting such VSB signals. The tuner also includes mixers for performing plural conversion of the selected channel to a final intermediate-frequency signal, which is digitized by an analog-to-digital converter. A phase tracker, operative on narrow-bandpass filtered portions of the digitized final intermediate-frequency signal centering on its carrier frequency, suppresses an imaginary portion of the final intermediate-frequency signal, arising from multipath distortion or from phase incoherency in local oscillations used during frequency conversion. A digital controlled oscillator in the phase tracker supplies digital descriptions of the carrier wave for the final intermediate-frequency signal to a synchronous detector, which synchronous detector detects the real portion of the digitized final intermediate-frequency signal in accordance with those digital descriptions of the carrier wave. The phase tracker generates the real and imaginary portions of the digitized final intermediate-frequency signal using a pair of all-pass digital filters, which exhibit a constant .pi./2 difference in phase response for the digitized bandpass signals and have finite impulse responses.

    摘要翻译： 在用于接收包括描述数字信号的符号代码的残留边带（VSB）信号的无线电接收机中，HDTV信号是这样的VSB信号的示例，调谐器提供用于在用于发送这样的VSB信号的频带中的不同位置处选择一个信道 。 调谐器还包括用于执行所选频道的多个转换到由模数转换器数字化的最终中频信号的混频器。 基于其载波频率的数字化最终中频信号的窄带通滤波部分的相位跟踪器抑制由多径失真引起的最终中频信号的虚部，或从多径失真引起的本地振荡中的相位不相干性 变频。 相位跟踪器中的数字控制振荡器将最终中频信号的载波的数字描述提供给同步检波器，该同步检测器根据这些数字描述的数字化最终中频信号的实际部分 载波。 相位跟踪器使用一对全通数字滤波器产生数字化的最终中频信号的实部和虚部，其对于数字化带通信号呈现相位响应的常数π/ 2差并且具有有限的脉冲响应。