专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

41. 发明授权

US07038732B1 DTV signal with GCR components in plural-data-segment frame headers and receiver apparatus for such signal 失效
标题翻译：具有多数据段帧头中的GCR分量的DTV信号和用于这种信号的接收机装置
公开(公告)号：US07038732B1
公开(公告)日：2006-05-02
申请号：US09700448
申请日：1999-05-11
申请人： Allen L. Limberg , Chandrakant B. Patel
发明人： Allen L. Limberg , Chandrakant B. Patel
IPC分类号： H04N7/24
CPC分类号： H04N5/211 , H04L1/0045 , H04L1/0057 , H04L1/006 , H04L1/0065 , H04N5/4401
摘要： A DTV signal has a plural-data-segment frame header including complementary first and second ghost-cancellation reference signals differentially delayed by the duration of two NTSC horizontal scan lines. A receiver for such DTV signal has an adaptive equalizer for baseband symbol code with kernel weights calculated by a computer operative on the equalizer response after comb filtering. The comb filter combines the equalizer response as differentially delayed by the duration of two NTSC horizontal scan lines to cancel artifacts of co-channel NTSC interference in the comb filtered equalizer response supplied to the computer. This reduces the undesirable influence of such artifacts on equalization to reduce intersymbol interference.
摘要翻译： DTV信号具有包含互补的第一和第二重影消除参考信号的多数据段帧头，差分延迟两个NTSC水平扫描线的持续时间。用于这种DTV信号的接收机具有用于基带符号代码的自适应均衡器，其中核心权重由梳理滤波之后的均衡器响应上操作的计算机计算。梳状滤波器将均衡器响应差分延迟了两个NTSC水平扫描线的持续时间，以消除提供给计算机的梳状滤波均衡器响应中的同频道NTSC干扰的伪像。这减少了这种伪影对均衡的不期望的影响，以减少符号间干扰。

42. 发明授权

US06803970B1 Digital television receiver with match filter responsive to field synchronization code 失效
标题翻译：具有匹配滤波器的数字电视接收机，响应于现场同步码
公开(公告)号：US06803970B1
公开(公告)日：2004-10-12
申请号：US09337493
申请日：1999-06-22
申请人： Allen LeRoy Limberg , Chandrakant B. Patel
发明人： Allen LeRoy Limberg , Chandrakant B. Patel
IPC分类号： H04N544
CPC分类号： H04N5/4401 , H04L7/08 , H04L25/03038 , H04L27/02 , H04N5/08 , H04N5/211
摘要： A radio receiver for receiving a selected digital TV signal uses final intermediate frequency signals the carrier frequencies of which are multiples of symbol rate. The radio receiver has a match filter receptive of rectified samples of digitized intermediate-frequency signal and responsive to the amplitude of the intermediate-frequency carrier being modulated in accordance with the field synchronization code group to generate a pulsed response to the beginning of each data field. This pulsed response is used to determine when data segment synchronization information should occur, so its detection is more certain to be accurate and data segment synchronization is more rapidly determined. Symbol synchronization is rapidly inferred from the field synchronization and data segment synchronization, so that the samples in each data line can be counted. The complex carrier frequencies of the final intermediate frequency signals are generated in response to the samples per data line count, for implementing synchronous detection to baseband. The adjustment of the carrier frequency of the final intermediate frequency signal to be a prescribed multiple of symbol rate is done in response to an automatic-frequency-and-phase-control signal developed from the synchronous detection results.
摘要翻译：用于接收所选择的数字TV信号的无线电接收机使用其载波频率是符号速率倍数的最终中频信号。无线电接收机具有接收经数字化的中频信号的整流样本的匹配滤波器，并且响应于根据场同步码组调制的中频载波的振幅，以产生对每个数据字段的开始的脉冲响应。这种脉冲响应用于确定何时发生数据段同步信息，因此其检测更确定是准确的，并且数据段同步被更快速地确定。符号同步可以从场同步和数据段同步快速推断出来，从而可以对每条数据行中的样本进行计数。响应于每个数据线计数的采样产生最终中频信号的复载波频率，以实现对基带的同步检测。响应于从同步检测结果产生的自动频率相位控制信号，将最终中频信号的载波频率调整为符号率的规定倍数。

43. 发明授权

US06512555B1 Radio receiver for vestigal-sideband amplitude-modulation digital television signals 有权
标题翻译：无线电接收机用于背景边带幅度调制数字电视信号
公开(公告)号：US06512555B1
公开(公告)日：2003-01-28
申请号：US09375235
申请日：1999-08-16
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 , H04L27/02 , H04N5/4401
摘要： Apparatus for reproducing data from a selected digital television signal, transmitted in packet form as vestigial-sideband (VSB) amplitude-modulation (AM) of a carrier, has a tuner for selecting a digital television signal and converting it to a final intermediate-frequency signal, which is digitized by an analog-to-digital converter before synchrodyning to baseband in the digital regime. VSB synchrodyning circuitry synchrodynes the digitized final intermediate-frequency signal to baseband in the digital regime to generate in-phase and quadrature-phase baseband signals. The quadrature-phase baseband signal is lowpass filtered to generate an automatic frequency and phase control (AFPC) signal for controlling a local oscillator in the tuner, so that the in-phase baseband signal comprises digitized VSB symbol coding. Symbol decoding circuitry responsive to the VSB symbol coding generates a digital data stream. Data synchronization recovery circuitry recovers data synchronizing information included in the digital data stream. A video decoder of decompression type, such as an MPEG-2 video decoder responsive to portions of the digital data stream, as selected in response to the data synchronizing information, generates digital signals descriptive of red, green and blue video signals.
摘要翻译：用于从作为载波的残留边带（VSB）幅度调制（AM）以分组形式发送的所选数字电视信号再现数据的装置具有用于选择数字电视信号并将其转换为最终中频的调谐器信号，其在数字方式中与基带同步之前由模数转换器数字化。 VSB同步电路将数字化的最终中频信号与数字方式的基带同步，以产生同相和正交相位基带信号。正交相位基带信号被低通滤波以产生用于控制调谐器中的本地振荡器的自动频率和相位控制（AFPC）信号，使得同相基带信号包括数字化的VSB符号编码。响应于VSB符号编码的符号解码电路产生数字数据流。数据同步恢复电路恢复包含在数字数据流中的数据同步信息。解调类型的视频解码器，如响应于数据同步信息选择的响应于数字数据流的部分的MPEG-2视频解码器，产生描述红色，绿色和蓝色视频信号的数字信号。

44. 发明授权

US06426780B1 DTV receiver with low-band final I-F signal filtered for suppressing co-channel interfering NTSC audio carrier 有权
标题翻译：具有用于抑制同频道干扰NTSC音频载波的低频最终I-F信号的DTV接收机
公开(公告)号：US06426780B1
公开(公告)日：2002-07-30
申请号：US09396799
申请日：1999-09-15
申请人： Allen LeRoy Limberg , Chandrakant B. Patel
发明人： Allen LeRoy Limberg , Chandrakant B. Patel
IPC分类号： H04N538
CPC分类号： H04N5/4446 , H04B1/28 , H04N5/21 , H04N5/211 , H04N5/4401 , H04N21/42607 , H04N21/4382
摘要： A digital television receiver converts very-high-frequency intermediate-frequency digital television signal to a band with uppermost frequency in the lower portion of the high-frequency range. This facilitates RLC analog filtering, such as a Butterworth-Thomson-transition filter or a bridged-T trap filter, being used for suppressing the frequency-modulated audio carrier of co-channel NTSC analog television signal prior to the digital television signal being synchrodyned to baseband for recovering symbol code. The delay distortion introduced by this analog filtering is compensated for in substantial part in surface-acoustic-wave bandpass filtering of the very-high-frequency intermediate-frequency digital television signals. Remnant delay distortion is reduced by channel equalization filtering carried out in the digital regime.
摘要翻译：数字电视接收机将高频中频数字电视信号转换到高频范围下部的最高频带。这有助于RLC模拟滤波，例如巴特沃思 - 汤姆逊转换滤波器或桥接T陷波滤波器，用于在数字电视信号同步到之前用于抑制同频道NTSC模拟电视信号的调频音频载波用于恢复符号码的基带。通过该模拟滤波引入的延迟失真在很大程度上被补偿在极高频中频数字电视信号的表面声波带通滤波中。通过在数字方式中进行的信道均衡滤波来减少残余延迟失真。

45. 发明授权

US06396542B1 TV receiver having kinescope with 16:9 aspect ratio screen and dot pitch for 480 lines per frame resolution 失效
标题翻译：电视接收机具有16：9宽高比屏幕的显像管和每帧分辨率480线的点间距
公开(公告)号：US06396542B1
公开(公告)日：2002-05-28
申请号：US08691664
申请日：1996-08-02
申请人： Chandrakant B. Patel
发明人： Chandrakant B. Patel
IPC分类号： H04N1100
CPC分类号： H04N7/012 , H04N5/4401 , H04N5/46 , H04N7/0122
摘要： A television receiver receives HDTV video signals and scan converts them to a lower line scanning rate with field-to-field interlace. This scan conversion is done to conserve the power consumption by the magnetic deflection system for the kinescope, which has a display screen with a 16:9 aspect ratio and a dot pitch for displaying a 480 scan line frame. The receiver receives scan converts NTSC video signals using time compression circuitry to present them in variants of letter-box form in which the images fill the full height of the display screen, but not its full width.
摘要翻译：电视接收机接收HDTV视频信号，并通过场对场交错将其扫描转换成较低的线扫描速率。这种扫描转换是为了节省显像管的磁偏转系统的功耗，其具有16：9宽高比的显示屏和用于显示480扫描线框的点间距。接收器接收扫描使用时间压缩电路对NTSC视频信号进行转换，以使其成为字母盒形式的变体，其中图像填满显示屏的全高，而不是其全宽。

46. 发明授权

US06313882B1 TV reception apparatus using same ghost-cancellation circuitry for receiving different types of TV signals 失效
标题翻译： TV接收装置使用相同的重影消除电路来接收不同类型的电视信号
公开(公告)号：US06313882B1
公开(公告)日：2001-11-06
申请号：US09217630
申请日：1998-12-22
申请人： Allen LeRoy Limberg , Chandrakant B. Patel
发明人： Allen LeRoy Limberg , Chandrakant B. Patel
IPC分类号： H04N521
CPC分类号： H04N5/211 , H04N5/4401 , H04N5/46
摘要： Television signal reception apparatus for receiving a television signal selected from among transmitted television signals of different types includes a respective receiver portion for each of the different types. Responsive to its respective type of television signal being received, each receiver portion supplies digitized baseband signal to adaptive digital filter circuitry shared by each receiver portion. The adaptive digital filter circuitry is operated for suppressing ghosts in that digitized baseband signal.
摘要翻译：用于接收从不同类型的发送的电视信号中选择的电视信号的电视信号接收装置包括用于每种不同类型的相应接收机部分。响应于其各自接收的电视信号的类型，每个接收器部分将数字化的基带信号提供给由每个接收机部分共享的自适应数字滤波器电路。自适应数字滤波器电路用于抑制该数字化基带信号中的重影。

47. 发明授权

US06222592B1 TV receiver equalizer storing channel characterizations for each TV channel between times of reception therefrom 有权
标题翻译： TV接收机均衡器在从其接收的时间之间存储每个TV频道的频道特征
公开(公告)号：US06222592B1
公开(公告)日：2001-04-24
申请号：US09168892
申请日：1998-10-09
申请人： Chandrakant B. Patel
发明人： Chandrakant B. Patel
IPC分类号： H04N521
CPC分类号： H04N5/211 , H04L25/03006 , H04L2025/03789 , H04N5/4401 , H04N5/455 , H04N5/50 , Y10S348/914
摘要： An adaptive channel equalizer for a digital television receiver includes memory for storing channel characterization information for each received channel, from each time the channel is tuned to until the next time the same channel is tuned to. The stored information is retained even if operating power to the receiver is interrupted. Whenever operating power is restored to the receiver after interruption and whenever a channel is tuned to again after having tuned to another channel, the previously stored channel characterization for the currently tuned channel is retrieved from memory. The retrieved channel characterization is used to calculate initial filter coefficients for the adaptive channel equalizer.
摘要翻译：用于数字电视接收机的自适应信道均衡器包括用于存储每个接收信道的信道特征信息的存储器，每个频道被调谐到下一次调谐到相同信道。即使接收机的工作电源中断，存储的信息也被保留。每当中断后操作电源恢复到接收器，并且每当在调谐到另一个通道之后再次调谐频道时，从存储器中检索先前存储的当前调谐频道的频道特性。所获取的信道特征用于计算自适应信道均衡器的初始滤波器系数。

48. 发明授权

US06211924B1 Decimation of baseband DTV signal prior to channel equalization in digital television signal receivers 失效
标题翻译：在数字电视信号接收机中对信道均衡之前的基带DTV信号进行抽取
公开(公告)号：US06211924B1
公开(公告)日：2001-04-03
申请号：US09415265
申请日：1999-10-12
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.
摘要翻译：无线电接收机使用相同的调谐器来接收选择的数字电视（DTV）信号，而不管它是正交幅度调制（QAM）还是残留边带（VSB）信号。最后的IF信号以QAM和VSB信号的符号频率的倍数的速率被数字化，用于与基带同步。通过将在数字电路中开发的自动频率和相位控制（AFPC）信号应用于本地振荡器，QAM和VSB最终IF信号的载波频率被调节为QAM和VSB信号的符号频率的倍数的倍数的调谐器。通过同步最终IF信号获得的基带DTV信号具有高于符号率的采样率，以促进符号同步。在执行信道均衡之前，将基带DTV信号抽取到符号速率，以减少信道均衡滤波器中所需的乘法器数量。

49. 发明授权

US6137545A Reception mode control in radio receivers for receiving both VSB and QAM digital television signals 有权
标题翻译：用于接收VSB和QAM数字电视信号的无线电接收机中的接收模式控制
公开(公告)号：US6137545A
公开(公告)日：2000-10-24
申请号：US375213
申请日：1999-08-16
申请人： Chandrakant B. Patel , Allen LeRoy Limberg
发明人： Chandrakant B. Patel , Allen LeRoy Limberg
IPC分类号： H03D1/24 , H03D5/00 , H04B1/28 , H04L1/00 , H04N5/44 , H04N5/455 , H04N5/46
CPC分类号： H04N5/4446 , H03D1/24 , H03D5/00 , H04B1/28 , H04H20/95 , H04H40/27 , H04L1/0054 , H04L27/0008 , H04L27/063 , H04L27/066 , H04L27/38 , H04L27/3827 , H04N5/4401 , H04N5/455 , H04L2027/0028 , H04L2027/0055 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04L27/0012 , H04N5/46 , H04N7/08
摘要： A radio receiver uses the same tuner for receiving a selected wideband digital signal of at least a few megahertz bandwidth, such as a digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal accompanied by an unmodulated pilot carrier signal; and a second transmission standard specifies quadrature amplitude modulation. It is determined at the receiver which of respective modulation formats specified for the various transmission standards is employed for transmitting the wideband digital signal being received. The wideband digital signal is demodulated to produce a demodulated signal, demodulation be done according to a demodulation format suitable for demodulating the modulation format determined to be employed for transmitting the wideband digital signal. The demodulated signal produced by demodulating the wideband digital signal according to this demodulation format is further processed according to the transmission standard determined at the receiver to have been employed for transmitting the wideband digital signal.
摘要翻译：无线电接收机使用相同的调谐器来接收诸如数字电视（DTV）信号的至少几兆赫兹带宽的所选宽带数字信号，而不管它是正交幅度调制（QAM）还是残留边带（VSB）信号伴随着未调制的导频载波信号; 第二传输标准规定了正交幅度调制。在接收机中确定为各种传输标准规定的各种调制格式中的哪一种被采用用于发送正在接收的宽带数字信号。宽带数字信号被解调以产生解调信号，根据适合于解调确定用于发送宽带数字信号的调制格式的解调格式进行解调。根据该解调格式对宽带数字信号进行解调而产生的解调信号根据在接收机处确定的传输标准被进一步处理，以用于发送宽带数字信号。

50. 发明授权

US5481316A System, apparatus and method for canceling televison ghost signals 失效
标题翻译：用于取消电视幽灵信号的系统，装置和方法
公开(公告)号：US5481316A
公开(公告)日：1996-01-02
申请号：US921686
申请日：1992-07-30
申请人： Chandrakant B. Patel
发明人： Chandrakant B. Patel
IPC分类号： H04N5/21
CPC分类号： H04N5/211
摘要： A ghost canceling reference signal transmission and reception system utilizes a ghost canceling reference signal including a zero to seventy IRE step followed by a seventy to zero IRE (sin x)/x step.
摘要翻译：重影消除参考信号发送和接收系统利用包括零到七十个IRE步骤之后是七十到零IRE（sin x）/ x步长的重影消除参考信号。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式