公开(公告)号：WO9715121A3

公开(公告)日：1997-05-15

申请号：PCT/DE9601919

申请日：1996-10-07

Applicant: BOSCH GMBH ROBERT ,  SIEGLE GERT

Inventor： SIEGLE GERT

IPC: H04N7/00 ,  H04H20/42 ,  H04H20/72 ,  H04J1/00 ,  H04J11/00 ,  H04L5/02 ,  H04N7/08 ,  H04B

CPC classification number: H04H20/42 ,  H04H20/72 ,  H04H2201/20 ,  H04L5/023 ,  H04N7/0803

Abstract: The invention concerns a method used for terrestrially transmitting at least one digital signal, in particular a digital radio and/or television broadcasting signal. According to this method, the at least one digital signal, whose data volume is reduced by coding, is preferably modulated by the OFDM method and transposed to the frequency position of at least one channel (31), which is adjacent at least one occupied or unoccupied channel (30, 32) for transmitting an analogue television broadcasting signal. The digital signal is then emitted in this frequency position. In this respect, the dynamic range and amplitude of the spectrum (41) of the at least one digital signal must be less than a predetermined value, which is far lower than the dynamic range and amplitude of the image carrier of the spectrum (35, 36) of the analogue television broadcasting signal, such that only slight inter and cross-modulation occurs with other digital signals or with analogue signals in other channels. The spectrum (41) of the at least one digital signal is transmitted separated from at least one adjacent channel (30, 32) by a protective frequency spacing (45). When a plurality of digital signals are transmitted in the at least one channel (31), the frequency ranges of at least two digital signals are transmitted separated from each other by a protective frequency spacing (50).

公开(公告)号：WO1997015121A2

公开(公告)日：1997-04-24

申请号：PCT/DE1996001919

申请日：1996-10-07

Applicant: ROBERT BOSCH GMBH ,  SIEGLE, Gert

Inventor： ROBERT BOSCH GMBH

IPC: H04B00/00

CPC classification number: H04H20/42 ,  H04H20/72 ,  H04H2201/20 ,  H04L5/023 ,  H04N7/0803

Abstract: The invention concerns a method used for terrestrially transmitting at least one digital signal, in particular a digital radio and/or television broadcasting signal. According to this method, the at least one digital signal, whose data volume is reduced by coding, is preferably modulated by the OFDM method and transposed to the frequency position of at least one channel (31), which is adjacent at least one occupied or unoccupied channel (30, 32) for transmitting an analogue television broadcasting signal. The digital signal is then emitted in this frequency position. In this respect, the dynamic range and amplitude of the spectrum (41) of the at least one digital signal must be less than a predetermined value, which is far lower than the dynamic range and amplitude of the image carrier of the spectrum (35, 36) of the analogue television broadcasting signal, such that only slight inter and cross-modulation occurs with other digital signals or with analogue signals in other channels. The spectrum (41) of the at least one digital signal is transmitted separated from at least one adjacent channel (30, 32) by a protective frequency spacing (45). When a plurality of digital signals are transmitted in the at least one channel (31), the frequency ranges of at least two digital signals are transmitted separated from each other by a protective frequency spacing (50).

Abstract translation: 它提出了一种用于至少一个数字信号的地面传输，尤其是数字无线电和/或电视广播信号的方法。 在该方法中，即通过编码在减少了数据量的至少一个数字信号被根据OFDM方法和频率位置的至少一个信道（31），所述至少一个占用或未占用的信道（30，32），用于模拟电视广播信号的传输优选调制 在相邻的，实施和在该频率位置发送。 在这种情况下，动态范围和所述至少一个数字信号的频谱（41）的振幅具有分别规定值比动态范围或模拟电视广播信号的频谱（35，36）的图象载波的振幅小得多低于使得仅 轻微交调，并与其它数字信号或与发生其它信道的模拟信号交叉调制。 该至少一个数字信号的频谱（41）被发送通过从至少一个相邻信道（30，32）的保护频率间隔（45）分离。 当发送多个在所述至少一个通道（31）的数字信号的，由保护频率间隔（50）的至少两个数字信号的频率范围彼此分开传送。

公开(公告)号：WO1992005646A1

公开(公告)日：1992-04-02

申请号：PCT/GB1991001571

申请日：1991-09-13

Applicant: NATIONAL TRANSCOMMUNICATIONS LIMITED ,  GLEDHILL, Jeffrey, John ,  ANIKHINDI, Santosh, Vasudev ,  AVON, Peter, Anthony

Inventor： NATIONAL TRANSCOMMUNICATIONS LIMITED

IPC: H04L05/06

CPC classification number: H04N21/2383 ,  H04L27/2602 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2679 ,  H04N7/0803 ,  H04N21/4382

Abstract: In an OFDM signal individual OFDM carriers are modulated by samples of signals which can only take a limited range of allowed values and a block of samples modulates the group of carriers during a time period T. In a receiver, the signal modulating an individual OFDM carrier may be demodulated by estimating the position of reference axes serving as the frame of reference against which the allowed modulating values are defined, and multiplying the value of the demodulated samples by the complex conjugate of a point on one of the estimated reference axes. The spread of the groups of samples demodulated from each OFDM carrier gives an indication of whether the receiver is synchronised to the block boundaries. Preferably spread of the complex samples is evaluated in the radial direction only and used to steer the sample clock frequency. Phase drift of the demodulated samples from one block to the next indicates the degree of local oscillator frequency error. Preferably phase drift is assessed by multiplying complex values by the complex conjugate of an earlier sample demodulated from the same OFDM carrier and using the resulting measure to steer the local oscillator frequency via a frequency locked loop.

Abstract translation: 在OFDM信号中，单个OFDM载波由信号样本进行调制，信号样本只能在一个时间周期T内采取有限范围的允许值，并且采样块对该载波组进行调制。在接收机中，调制单个OFDM载波 可以通过估计用作被定义的允许调制值的参考系的参考轴的位置，并将解调样本的值乘以估计参考轴之一上的点的复共轭来解调。 从每个OFDM载波解调的样本组的扩展给出接收机是否与块边界同步的指示。 优选地，仅在径向方向上评估复样品的扩展，并用于引导采样时钟频率。 从一个块到下一个块的解调样本的相位漂移表示本地振荡器频率误差的程度。 优选地，通过将​​复数值乘以从相同OFDM载波解调的较早样本的复共轭并使用所得到的度量来经由频率锁定环来引导本地振荡器频率来评估相位漂移。

公开(公告)号：WO00054501A1

公开(公告)日：2000-09-14

申请号：PCT/US2000/005714

申请日：2000-03-07

IPC: H04J1/06 ,  H04N5/40 ,  H04N5/44 ,  H04N5/46 ,  H04N7/08 ,  H04N7/10 ,  H04N7/24

CPC classification number: H04N5/46 ,  H04J1/06 ,  H04N5/40 ,  H04N5/4401 ,  H04N5/4446 ,  H04N7/0803 ,  H04N7/10

Abstract: An upconverter for converting IF television signals to VHF or UHF signals prior to broadcast is configured to process either analog or digital televison signals. The upconverter identifies the type of incoming television signal and generates an appropriate reference signal depending on whether the incoming televison signal is digital or analog. In an analog format, the reference signal is used by the modulator generating the IF signal to synchronize phase with the signals output by various other upconverters. In a digital format, the reference signal is used, for example, as a test signal for the upconversion circuit.

Abstract translation: 用于在广播之前将IF电视信号转换为VHF或UHF信号的上变频器被配置为处理模拟或数字电视信号。 上变频器识别输入电视信号的类型，并根据进入的电视信号是数字还是模拟产生适当的参考信号。 在模拟格式中，参考信号由生成IF信号的调制器使用，以使其与各种其它上变频器输出的信号同步。 在数字格式中，参考信号例如用作上变频电路的测试信号。

公开(公告)号：WO99055087A1

公开(公告)日：1999-10-28

申请号：PCT/US1999/008513

申请日：1999-04-16

IPC: H04N5/40 ,  H03C5/00 ,  H04B1/04 ,  H04N5/44 ,  H04N7/08 ,  H04N7/081 ,  H04N21/462

CPC classification number: H04N7/0803 ,  H04N5/4401 ,  H04N7/08

Abstract: A system for transmitting digital programming includes a program source providing digital information, circuitry for modulating the digital information onto a visual carrier modulated with analog television programming, and a visual transmitter coupled to the modulating circuitry. Using a phase modulation method, the system phase modulates the digital information onto a visual carrier, reduces the baseband frequencies of the phase modulated visual carrier, and amplitude modulates the phase-modulated video carrier onto a video signal. The amplified and encoded video signal are combined with an amplified sound signal and transmitted. Using an additive method, the system modulates the sidebands of the video carrier with the digital information and amplitude modulates the video signal onto the video carrier. The data-modulated sidebands are phase-shifted such that they will be in quadrature with the amplitude-modulated video signal. The system combines the amplitude-modulated video carrier and the data-modulated quadrature sidebands. With a blended multiplicative/additive method, the system provides phase modulation and quadrature sideband addition to provide an optimized result.

Abstract translation: 用于发送数字节目的系统包括提供数字信息的节目源，用于将数字信息调制到用模拟电视节目调制的视频载波上的电路以及耦合到调制电路的视觉发射器。 使用相位调制方法，系统将数字信息调制到可视载波上，降低相位调制视频载波的基带频率，并将相位调制视频载波幅度调制到视频信号上。 放大和编码的视频信号与放大的声音信号组合并传输。 使用加法方法，系统利用数字信息调制视频载波的边带，并将视频信号幅度调制到视频载体上。 数据调制边带被相移，使得它们将与调幅视频信号正交。 该系统组合幅度调制视频载波和数据调制正交边带。 利用混合乘法/加法法，系统提供相位调制和正交边带加法，以提供优化的结果。

公开(公告)号：WO1991015925A1

公开(公告)日：1991-10-17

申请号：PCT/GB1991000513

申请日：1991-04-02

Applicant: NATIONAL TRANSCOMMUNICATIONS LIMITED ,  MASON, Arthur, Gordon ,  GLEDHILL, Jeffrey, John

Inventor： NATIONAL TRANSCOMMUNICATIONS LIMITED

IPC: H04N07/08

CPC classification number: H04N21/2383 ,  H04L27/2602 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2691 ,  H04N7/0803 ,  H04N21/4382

Abstract: A low power OFDM signal may be transmitted in an environment where it is subject to interference from other transmissions, e.g. broadcast television services. In a receiver interference is reduced by ignoring information modulating OFDM carriers at the frequencies corresponding to the carriers of the interfering transmissions; adjacent channel interference is reduced by ignoring data on OFDM carriers at the band edges and interference from third order intermodulation products is reduced by the ignoring OFDM carriers affected. Image channel interference is reduced by using an intermediate frequency for a first mixing process in the receiver such that the image channel interference affects OFDM carriers at frequencies which are already being ignored by the receiver. Preferably no data is modulated onto OFDM carriers which are to be ignored by the receiver. Preferably the modulation of the OFDM carriers is arranged so as to produce a real baseband representation of the OFDM signal.

Abstract translation: 低功率OFDM信号可以在其受其他传输的干扰的环境中传输，例如， 广播电视服务。 在接收机中，通过忽略在对应于干扰传输的载波的频率上调制OFDM载波的信息来减少干扰; 通过忽略频带边缘上的OFDM载波上的数据来减少相邻信道干扰，并且通过忽略受影响的OFDM载波来减少来自三阶互调乘积的干扰。 通过对接收机中的第一混合处理使用中频降低图像信道干扰，使得图像信道干扰在接收机已经被忽略的频率处影响OFDM载波。 优选地，没有数据被调制到要被接收机忽略的OFDM载波上。 优选地，OFDM载波的调制被布置为产生OFDM信号的实际基带表示。

公开(公告)号：WO2004030359A1

公开(公告)日：2004-04-08

申请号：PCT/US2003/030327

申请日：2003-09-24

Applicant: DOTCAST, INC. ,  HOARTY, Leo, W. ,  CICIORA, Walter, S. ,  HARTSON, Ted, E.

Inventor： HOARTY, Leo, W. ,  CICIORA, Walter, S. ,  HARTSON, Ted, E.

IPC: H04N7/08

CPC classification number: H04N21/4782 ,  H04N5/4401 ,  H04N7/08 ,  H04N7/0803 ,  H04N7/0806 ,  H04N7/10 ,  H04N7/17309 ,  H04N21/4622

Abstract: Various embodiments of the invention provide apparatus, methods, and systems for effectuating an increase in the effective bandwidth of a cable television distribution plant in a manner compatible with most common cable television systems. By using methods and systems for simultaneously transmitting a standard analog television signal and a digital data signal in a manner that minimizes interference of each with the other, one or more data carriers may be embedded within one or more analog television channels in accordance with various aspects of the present invention. These combined signals can be transmitted transparently over the existing cable television distribution plant to a location at or near the subscribers so that, among other things, the set top boxes can download context for controllable viewing when they choose.

Abstract translation: 本发明的各种实施例提供了以与大多数常见的有线电视系统兼容的方式实现有线电视分配工厂的有效带宽增加的装置，方法和系统。 通过使用以最小化每个与另一个的干扰的方式同时传输标准模拟电视信号和数字数据信号的方法和系统，根据各个方面，一个或多个数字载波可嵌入在一个或多个模拟电视频道内 的本发明。 这些组合的信号可以透过现有的有线电视分配工厂透明传输到订户或其附近的位置，使得机顶盒可以下载上下文以便在可选择的情况下进行选择。

公开(公告)号：WO9518504A2

公开(公告)日：1995-07-06

申请号：PCT/IB9400412

申请日：1994-12-12

Applicant: PHILIPS ELECTRONICS NV ,  PHILIPS NORDEN AB

Inventor： HULYALKAR SAMIR NARAYAN

IPC: H04L25/497 ,  H04N7/015 ,  H04N7/08 ,  H04N7/081 ,  H04N7/24 ,  H04N7/00

CPC classification number: H04N21/2383 ,  H04L25/497 ,  H04N7/015 ,  H04N7/0803 ,  H04N21/4382

Abstract: A system for transmitting and receiving digital data which utilizes pre-coding at a transmitter, and selects post-coding at a receiver when co-channel interference or post-comb processing at the receiver when co-channel interference is present. The system comprises a symbol interleaver at the transmitter and a symbol deinterleaver at the receiver which minimizes the byte errors by organizing the data input at the pre-coder at the transmitter such that the symbol errors and their respective propagated errors are re-organized so as to be disposed adjacent to each other, thereby forming adjacent symbol errors. The effect of this re-organization is to increase the probability that each pair of adjacent symbol errors correspond to bits which lie in the same byte.

Abstract translation: 一种用于发送和接收数字数据的系统，其利用发射机处的预编码，并且当存在同信道干扰时在接收机处进行同信道干扰或后梳状处理时在接收机处选择后编码。 该系统包括发射机处的符号交织器和接收器处的符号解交织器，通过组织在发射机处的预编码器处输入的数据来最小化字节错误，使得符号错误及其相应的传播错误被重新组织，以便 彼此相邻地布置，从而形成相邻的符号错误。 这种重新组织的效果是增加每对相邻符号错误对应于位于相同字节中的位的概率。

公开(公告)号：WO1992009174A1

公开(公告)日：1992-05-29

申请号：PCT/US1991008277

申请日：1991-11-07

Applicant: ZENITH ELECTRONICS CORPORATION

Inventor： ZENITH ELECTRONICS CORPORATION ,  CITTA, Richard, W. ,  MUTZABAUGH, Dennis, M. ,  SGRIGNOLI, Gary, J.

IPC: H04N11/14

CPC classification number: H04N7/0803 ,  H04N5/21 ,  H04N5/4401 ,  H04N5/455 ,  H04N11/002 ,  H04N11/006

Abstract: A television signal transmission signal comprises a suppressed carrier, VSB signal having respective Nyquist slopes at the lower and upper edges of a 6MHz television channel, the center frequency of the Nyquist slope at the lower edge of the channel being substantially coincident whith the frequency of the suppressed carrier, and the pilot signal in quadrature relation with the suppressed carrier. The suppressed carrier is modulated by an N-level digitally encoded signal having a sample rate fs substancially equalto three times the NTSC color subcarrier frequency, with the frequency of the color subcarrier being less than the co-channel NTSC picture carrier by an amount equal to about fs/12. The received signal is demodulated by a synchronous detector in response to the received pilot signal and interfering NTSC beat components are attenuated by a linear filter having notches at fs/12, 5fs/12 and fs/2. The output of the filter comprises an M-level signal, where M = greater than N, which is converted to a N-level output signal representing the televised image.

公开(公告)号：WO2007132877A1

公开(公告)日：2007-11-22

申请号：PCT/JP2007/060009

申请日：2007-05-16

Applicant: ソニー株式会社 ,  松浦 勝治 ,  鈴木 和良

Inventor： 松浦 勝治 ,  鈴木 和良

IPC: H04N7/173 ,  G09G5/00 ,  H04N11/00 ,  H04N11/24

CPC classification number: H04N7/083 ,  G09G5/003 ,  G09G5/02 ,  G09G2340/10 ,  G09G2340/12 ,  G09G2370/047 ,  H04N5/04 ,  H04N7/015 ,  H04N7/035 ,  H04N7/0803 ,  H04N7/081 ,  H04N7/087 ,  H04N7/088 ,  H04N7/10

Abstract: 　本発明は、ＨＤＭＩ（Ｒ）等において、効率的なデータ伝送を行うことができる通信システム、送信装置及び受信装置、通信方法、並びにプログラムに関する。 ＨＤＭＩ（Ｒ）ソース５３は、Ｅ－ＥＤＩＤのＶＳＤＢに基づいて、ＨＤＭＩ（Ｒ）シンク６１が副信号を受信することができるか否かを判定し、ＨＤＭＩ（Ｒ）シンク６１が副信号を受信することができる場合、トランスミッタ７２により送信される送信画素データよりもビット数が少ない画素データからなる主画像の画素データに、副信号を付加することにより、送信画素データを構成し、トランスミッタ７２により、ＴＭＤＳチャンネル＃０ないし＃２で送信する。また、ＨＤＭＩ（Ｒ）ソース５３は、垂直帰線区間のコントロール区間において、送信画素データに、副信号が含まれるかどうかを表す副信号情報を含むゼネラルコントロールパケットを送信する。本発明は、例えばＨＤＭＩ（Ｒ）に適用できる。

Abstract translation: 提供了能够在HDMI（R）中执行有效数据传输的通信系统，传输设备，接收设备，通信方法和程序。 HDMI（R）源（53）判断HDMI（R）信宿（61）是否可以根据E-EDID的VSDB接收子信号。 如果HDMI（R）信宿（61）可以接收子信号，则通过将子信号加到由从发送器发送的发送像素数据的比特数较少的像素数据形成的主图像像素数据中， （72），并经由TMDS信道＃0或＃2由发射机（72）发送。 此外，HDMI（R）源（53）在垂直反复部分控制部分中发送包括表示发送像素数据是否包含子信号的子信号信息的通用控制分组。 本发明可以应用于例如HDMI（R）。