公开(公告)号：EP1050963A4

公开(公告)日：2004-03-17

申请号：EP99972385

申请日：1999-11-11

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： AZAKAMI HIROSHI ,  SERITA MASASHI ,  KONISHI TAKAAKI

IPC分类号： H03J1/00 ,  H03J7/00 ,  H04L27/26 ,  H04N5/44 ,  H04N5/455 ,  H03J7/18

CPC分类号： H04L27/2657 ,  H03J1/0075 ,  H03J7/00 ,  H04N5/4401 ,  H04N5/455 ,  H04N21/4382 ,  H04N21/6112

摘要： A receiver for digital terrestrial broadcasting, which can receive a digital broadcasting of a channel that the user wants to receive without any error by solving the problems caused by the transition of terrestrial broadcasting from the analog system to digital one. The regular frequency, upper-offset frequency, and lower-offset frequency assigned for the digital broadcasting for each channel are stored in a channel initial data storage unit (17) of a digital terrestrial broadcasting receiver (100). When the user specifies a desired channel, a front end unit (13) is operated based on the three assigned frequencies, and the frequency of digital broadcasting out of the three frequencies is found based on the OFDM synchronizing signal outputted from an OFDM demodulating unit (39) of the front end unit (13).

公开(公告)号：EP1071280A3

公开(公告)日：2003-10-29

申请号：EP00115464.0

申请日：2000-07-18

申请人： Conexant Systems, Inc.

发明人： Pulley, Douglas Roger

IPC分类号： H04N5/455 ,  H04L27/26 ,  H04L25/03 ,  H04N5/44

CPC分类号： H04N5/455 ,  H04L27/2662 ,  H04L27/2678 ,  H04N21/42607 ,  H04N21/4382 ,  H04N21/6112

摘要： A receiver circuit is for processing a received signal which includes at least a first portion and a second portion which repeats the content of the first portion after a repeat interval. For example, the receiver may be for DVB-T signals using COFDM. Two correlation values are measured. The first is between the first portion of the received signal, delayed by the repeat interval plus a difference interval, and the second portion. The second is between the first portion of the received signal, delayed by the repeat interval minus a difference interval, and the second portion. Any difference between the correlation values represents a difference between the receiver sampling rare, and the required sampling rate, and can be used to adjust the receiver sampling rate.

摘要翻译： 接收器电路用于处理接收信号，该接收信号至少包括第一部分和在重复间隔之后重复第一部分的内容的第二部分。 例如，接收机可以是使用COFDM的DVB-T信号。 测量两个相关值。 第一部分位于接收信号的第一部分，延迟了重复间隔加上差异间隔，以及第二部分。 第二部分位于接收信号的第一部分与延迟了重复间隔减去差值间隔的第一部分和第二部分之间。 相关值之间的任何差异代表了罕见接收机采样与所需采样率之间的差异，并且可用于调整接收机采样率。

公开(公告)号：EP0677923B1

公开(公告)日：2003-04-23

申请号：EP95300992.5

申请日：1995-02-16

申请人： LG ELECTRONICS INC.

发明人： Park, Hee Bok

IPC分类号： H03J7/06 ,  H04N7/00 ,  H04N5/455 ,  H04N11/00

CPC分类号： H04N5/455 ,  H03J7/04

公开(公告)号：EP1197077A1

公开(公告)日：2002-04-17

申请号：EP00945375.4

申请日：2000-07-13

申请人： Thomson Licensing S.A.

发明人： BOUILLET, Aaron, Reel ,  STEWART, John, Sidney

IPC分类号： H04N5/455

CPC分类号： H04N5/455 ,  H04N5/4401 ,  H04N21/42607 ,  H04N21/4382

摘要： In a receiver for processing a vestigial sideband (VSB) modulated signal containing terrestrial broadcast high definition television information and a pilot component, and for which multipath interference can lead to significant attenuation within narrow bands of the received signal spectrum containing the pilot tone of an Advanced Television Systems Committee (ATSC) high definition television (HDTV) broadcast signal, it has been found desirable to amplify the input signal in order to achieve synchronization of the receiver's phase-locked loop to the received pilot tone. Once this initial acquisition has been established, the amplification applied to the received signal can be reduced to a level appropriate for remaining blocks in the demodulation chain without upsetting the pilot tone synchronization. Thus, according to the present invention, the gain applied to the received ATSC VSB signal is set higher during pilot tone acquisition than it is during the remaining stages of demodulation.

公开(公告)号：EP0963110A3

公开(公告)日：2002-03-27

申请号：EP99109693.4

申请日：1999-05-17

申请人： Micronas GmbH

发明人： Fiesel, Hans, Dipl.-Ing.

IPC分类号： H04N5/455

CPC分类号： H04N5/4446

摘要： Frequenzumsetzungseinrichtung zur Umsetzung eines Zwischenfrequenz-Fernsehsignalgemisches (s2) in eine tiefe Frequenzlage mittels eines Mischers (4), der an seinem hochfrequenten Signaleingang (4.1) über ein Zwischenfrequenzfilter (3) mit dem Zwischenfrequenz-Fernsehsignalgemisch (s2) und an seinem lokalen Oszillatoreingang (4.2) mit einem Umsetzungssignal (u) gespeist ist, wobei die Frequenz des Umsetzungssignals (u) im Bereich eines durch den Kanalabstand (k 0; k 0 *) und den jeweiligen Fernsehsignalstandard definierten Nachbarbildträges (NBT) liegt der nach der Frequenzumsetzung als umgesetzter Nachbarbildträger (NBT*) mittels einer Hochpass-Selektionsflanke (HP) einer Filtereinrichtung (5) unterdrückt oder zumindest bis auf einen unwesentlichen Amplitudenrest abgeschwächt ist.

公开(公告)号：EP1181819A1

公开(公告)日：2002-02-27

申请号：EP00925674.4

申请日：2000-05-16

申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

发明人： TAKETANI, Nobuo ,  MORIBE, Hiroshi ,  MORITA, Hisao ,  SHIBUTANI, Ryuichi

IPC分类号： H04N5/46 ,  H04N9/68 ,  H04N5/455

CPC分类号： H04N5/455 ,  H04N5/46 ,  H04N9/68 ,  H04N11/186

摘要： The color signal reproducing apparatus of the invention is composed of multipliers (104, 105) for issuing X- and Y-axis signals by multiplying the color subcarrier signal of SECAM composite video signal by SIN component or COS component of local subcarrier signal, an ACC control voltage generator (106) for generating an ACC control signal by squaring and adding the X- and Y-axis signals in the burst gate pulse period, and a gain controller (102) for adjusting the amplitude of color subcarrier, and is constructed to control the gain controller by its ACC control signal. While using the color signal reproducing circuit commonly in three major television systems in the world, ACC of high precision is realized even in the case where the S/N state of SECAM color subcarrier signal is lowered.

公开(公告)号：EP1150500A2

公开(公告)日：2001-10-31

申请号：EP01303767.6

申请日：2001-04-25

申请人： SONY CORPORATION

发明人： Yanagi, Shigeto, c/o Sony Corporation ,  Nagano, Toshiyuki, c/o Sony Corporation ,  Sano, Hiromichi, c/o Sony Corporation ,  Kaida, Takayuki, c/o Sony Corporation

IPC分类号： H04N5/455

CPC分类号： H04N5/60 ,  H04N5/4446 ,  H04N5/455 ,  H04N5/52 ,  H04N21/4263 ,  H04N21/43632

摘要： A band-pass filter (175) separates an audio intermediate frequency signal (SIFS) from an input television intermediate frequency signal (SIF), and an A/D converter circuit (215) converts the signal (SIFS) into a digital signal (DIFS). A digital signal processor (225) performs audio detection on the signal (DIFS) and forms an AGC signal (DAGCS) based on the signal (DIFS). A variable gain amplifier (185) performs AGC on the audio intermediate frequency signal. A band-pass filter (175) separates and takes out a video intermediate frequency signal (SIFP) from the input television intermediate frequency signal (SIF), and an A/D converter circuit (21P) converts the signal (SIFP) into a digital signal (DIFP). A digital signal processor (22P) performs video detection on the signal (DIFP). An AGC signal (DAGC) is formed based on the signals (DIFP) and AGC is performed on the input television intermediate frequency signal (SIF) by using the AGC signal (DAGC).

公开(公告)号：EP1079620A2

公开(公告)日：2001-02-28

申请号：EP00114882.4

申请日：2000-07-12

申请人： MITSUBISHI DENKI KABUSHIKI KAISHA

发明人： Bao, Jay ,  Zeng, Shiyu

IPC分类号： H04N5/455

CPC分类号： H04L7/0029 ,  H04L27/38 ,  H04L2027/003 ,  H04L2027/0042 ,  H04L2027/0057 ,  H04N5/4401 ,  H04N5/455 ,  H04N21/42607 ,  H04N21/4382

摘要： A phase-lock loop circuit in a demodulator includes a timing recovery block and a carrier recovery block. The demodulator for demodulates a digital signal including symbols. The phase-lock loop includes an integrator processing a block of N samples to produce an average of the N symbols, and means for supplying the average of the N symbols to the timing recovery block and the carrier recovery block every NT period, where T is a sample time interval.

摘要翻译： 解调器中的锁相环电路包括定时恢复块和载波恢复块。 解调器，用于解调包括符号的数字信号。 锁相环包括对N个采样块进行处理以产生N个符号的平均值的积分器，以及每N个周期将N个符号的平均值提供给定时恢复块和载波恢复块的装置，其中T是 采样时间间隔。

公开(公告)号：EP1071279A2

公开(公告)日：2001-01-24

申请号：EP00115463.2

申请日：2000-07-18

申请人： Conexant Systems, Inc.

发明人： Pulley, Douglas Roger

IPC分类号： H04N5/455

CPC分类号： H04L27/2662 ,  H04L27/2678 ,  H04N5/4401

摘要： A receiver circuit is for processing a received signal which includes at least a first portion and a second portion which repeats the content of the first portion after a repeat interval. For example, the receiver may be for DVB-T signals using COFDM. In order to ensure that the estimated symbol start position is accurate, the receiver calculates two correlation values, namely an early correlation and a late correlation. The early correlation is measured between samples ahead of an assumed first portion start position and ahead of an assumed second portion start position, and the late correlation is measured between samples behind an assumed first portion end position and behind an assumed second portion end position. When the assumed start and end positions are accurate, the early and late correlations are equal, and so the assumed start and end positions are controlled to equalize the early correlation and the late correlation.

摘要翻译： 接收器电路用于处理接收信号，该接收信号至少包括第一部分和在重复间隔之后重复第一部分的内容的第二部分。 例如，接收机可以是使用COFDM的DVB-T信号。 为了确保估计的符号开始位置准确，接收机计算两个相关值，即早期相关和晚期相关。 在假设的第一部分起始位置之前和假定的第二部分起始位置之前的样本之间测量早期相关性，并且在假设的第一部分结束位置之后并且假设的第二部分结束位置之后的样本之间测量晚期相关性。 当假定的开始和结束位置准确时，早期和晚期相关性是相等的，因此控制假定的开始和结束位置以均衡早期相关性和晚期相关性。

公开(公告)号：EP0715457B1

公开(公告)日：2000-07-26

申请号：EP95402698.5

申请日：1995-11-30

申请人： SONY CORPORATION

发明人： Natsume, Yoshitaka, c/o Sony Corporation

IPC分类号： H04N5/455 ,  H03D1/22

CPC分类号： H03D1/2236 ,  H04N5/455