公开(公告)号：US4743960A

公开(公告)日：1988-05-10

申请号：US870128

申请日：1986-06-03

申请人： Gerard Duvic ,  Michel Veillard ,  Laurent Paris ,  Patrice Senn

发明人： Gerard Duvic ,  Michel Veillard ,  Laurent Paris ,  Patrice Senn

IPC分类号： H04N9/67 ,  H04N9/64 ,  H04N9/77 ,  H04N9/78 ,  H04N11/04

CPC分类号： H04N9/64 ,  H04N9/77 ,  H04N9/78

摘要： Circuit for producing analog primary signals of a television signal from its digital luminance and chrominance components comprising in series an interpolating digital filter, a digital dematrixer and three digital - analog converters.The interpolating digital filter carried out an oversampling of the luminance signal Y in a ratio of 2 and an oversampling of each chrominance signal CR, CB in a sampling ratio such that the sampling frequency of the luminance and chrominance digital signals has the same sampling frequency. The digital dematrixer produces the primary digital color signals from the oversampled luminance and chrominance components.

摘要翻译： 用于从其数字亮度和色度分量产生电视信号的模拟主信号的电路，包括内插数字滤波器，数字dematrixer和三个数模转换器。 内插数字滤波器以比例2对亮度信号Y进行过采样，并以采样比使每个色度信号CR，CB过采样，使得亮度和色度数字信号的采样频率具有相同的采样频率。 数字dematrixer从过采样的亮度和色度分量产生主要的数字彩色信号。

公开(公告)号：US4713695A

公开(公告)日：1987-12-15

申请号：US823249

申请日：1986-01-28

申请人： Guy Macheboeuf

发明人： Guy Macheboeuf

IPC分类号： H04N5/265 ,  H04N9/76 ,  H04N5/262 ,  H04N5/272

CPC分类号： H04N9/76 ,  H04N5/265

摘要： A television picture superimposing system comprises a video mixer including two variable gain amplifying circuits receiving two input picture signals having a given peak-to-peak amplitude, and an adding circuit for mixing the amplified picture signals into a resulting picture signal. The improvement resides in providing a circuit for deriving a single gain control signal based upon a linear combination of two signals derived respectively from the two input picture signals so that the resulting signal has the given peak-to-peak amplitude. The control signal is respectively applied, via an analog inverting circuit and directly, to gain control inputs of the variable gain amplifying circuits.

摘要翻译： 电视图像叠加系统包括一个视频混合器，该视频混合器包括两个可变增益放大电路，其接收具有给定峰 - 峰幅度的两个输入图像信号，以及一个加法电路，用于将放大的图像信号混合成所得图像信号。 改进之处在于提供一种用于基于分别从两个输入图像信号导出的两个信号的线性组合导出单个增益控制信号的电路，使得所得到的信号具有给定的峰 - 峰幅度。 控制信号分别通过模拟反相电路施加，并直接用于增益可变增益放大电路的控制输入。

公开(公告)号：US4713689A

公开(公告)日：1987-12-15

申请号：US739719

申请日：1985-05-31

申请人： Jacques Veillard

发明人： Jacques Veillard

IPC分类号： H04L27/148 ,  H04N5/455 ,  H04N7/045 ,  H04N11/08 ,  H04N7/04 ,  H04N7/08

CPC分类号： H04N11/08 ,  H04N5/455 ,  H04N7/045

摘要： A receiver is provided for a television system which uses time division miplexing (TDM) of analog image signals and of bursts of duobinary coded digital data signals. The digital data signals are transmitted during the line and frame blanking intervals and grouped together in packets, comprising the sound and synchronization signals, the spectral width required by the analog part being greater than that required by the digital part. The receiver comprises a common frequency demodulator for the analog and digital signals, adaptive as a function of the signal-to-noise ratio after demodulation as a width less than the width which is optimum for the analog part when the latter has a high signal-to-noise ratio. The demodulator has an input filter which is either analog or digital and may be adjusted in response to the error rate.

摘要翻译： 提供了一种用于电视系统的接收机，其使用模拟图像信号的时分复用（TDM）和双二进制编码的数字数据信号的突发。 数字数据信号在行和帧消隐间隔期间被发送，并且被分组在一起，包括声音和同步信号，模拟部分所需的频谱宽度大于数字部分所需的频谱宽度。 接收机包括用于模拟和数字信号的公共频率解调器，作为解调之后的信噪比的函数作为宽度小于当模拟部分具有高信号时的模拟部分最佳的宽度的自适应时， 信噪比。 解调器具有输入滤波器，其为模拟或数字的，并可根据误码率进行调整。

公开(公告)号：USRE32187E

公开(公告)日：1986-06-17

申请号：US270097

申请日：1981-06-03

申请人： Jean F. Barda ,  Roger Brusq ,  Bernard Marti ,  Alain Poignet

发明人： Jean F. Barda ,  Roger Brusq ,  Bernard Marti ,  Alain Poignet

IPC分类号： G09G5/02 ,  G09G5/22 ,  H04N7/025

CPC分类号： H04N7/0255 ,  G09G5/026 ,  G09G5/222

摘要： In the disclosed teletext system, the transmitter station broadcasts data cks data from several channels, the data packs being time multiplexed. Each data pack comprises a prefix signal for causing a teletext receiver either to accept the data packs of a selected channel or to reject data packs from other channels. In addition to the prefix, and possibly page flags followed by page numbers and row flags followed by row numbers, the sequence of eight-bit words, transmitted in a pack, may comprise escape eight-bit words followed by type identity eight-bit words, which are themselves followed by a sequence of characters to be displayed in the same type the identity of which is determined by the preceding type identity eight-bit words. Each teletext receiver comprises, a first conventional random access memory storing the coded characters, a second random access memory storing the type identity eight-bit words at the same address as those of the characters belonging to the sequence in the first random access memory. A read operation from the first random access memory, for display purpose, is performed at the same time as the read operation from the second random access memory. The output signals of the second memory select a character generator which includes a permanent memory which reads out the shape of those characters which read out from the first random access memory.

公开(公告)号：US4555736A

公开(公告)日：1985-11-26

申请号：US369977

申请日：1982-04-19

申请人： Michel G. Mathieu ,  Andre J. L. Le Rodallec

发明人： Michel G. Mathieu ,  Andre J. L. Le Rodallec

IPC分类号： H04N5/85 ,  G11B7/085 ,  G11B17/00 ,  G11B27/10 ,  G11B27/30 ,  H04N5/76 ,  G11B21/00

CPC分类号： G11B7/08511 ,  G11B17/005 ,  G11B27/105 ,  G11B27/3054 ,  G11B2220/20 ,  G11B2220/2587

摘要： A videodisc reader head positioning control system stores the keyed-in address for a desired picture frame and compares it to the track address for the frames during passage of the reader head toward the desired frame. Logic circuitry distinguishes the difference between the desired address and the address of the head's current position in order to control the head positioning unit at a fast, intermediate, or precision speed. Upon reaching the desired address, the logic circuitry maintains the position of the head for stop frame display of the picture information.

摘要翻译： 视盘读取器头部定位控制系统存储所需图像帧的键入地址，并且在阅读器头朝向期望帧期间将其与帧的轨道地址进行比较。 逻辑电路区分所需地址与头部当前位置的地址之间的差异，以便以快速，中间或精确的速度控制头部定位单元。 在达到期望的地址时，逻辑电路保持头部的位置用于图像信息的停止帧显示。

公开(公告)号：US4434498A

公开(公告)日：1984-02-28

申请号：US264842

申请日：1981-05-18

申请人： Michel Mathieu

发明人： Michel Mathieu

IPC分类号： H04L7/00 ,  H04J3/07 ,  H04L7/02

CPC分类号： H04J3/07

摘要： A digital signal formed from successive words representing quantized samples of sound information and comprising silent periods is synchronized with a local reading clock. For that, the words are stored in a random access memory as they arrive, they are read at the frequency of the local clock and the filling rate of the store is permanently determined. A comparator compares this rate with a given range. If the filling rate is greater than a maximum threshold or less than a minimum threshold, the contents of the memory are modified at the first silent interval which appears.

摘要翻译： 由表示声音信息的量化样本并包括静音期的连续字形成的数字信号与本地读取时钟同步。 为此，这些字在到达时存储在随机存取存储器中，它们以本地时钟的频率读取，并且存储器的填充率被永久确定。 比较器将此速率与给定范围进行比较。 如果填充率大于最大阈值或小于最小阈值，则存储器的内容将以出现的第一个静默间隔进行修改。

公开(公告)号：US4354201A

公开(公告)日：1982-10-12

申请号：US158499

申请日：1980-06-11

申请人： Claude Sechet ,  Gerard Babonneau ,  Louis C. Guillou

发明人： Claude Sechet ,  Gerard Babonneau ,  Louis C. Guillou

IPC分类号： H04N7/16 ,  H04K1/04

CPC分类号： H04K1/00 ,  H04N7/166

摘要： A television system with access control comprises a transmitter and receis. The transmitter comprises a video signal and sound signal formation circuit, means for transmitting these signals and a jamming circuit using a service key. Each receiver comprises means for receiving the transmitted signals, means for the display of the picture and for restoring the sound and an unjamming circuit connected to the reception means and working with the service key.It also comprises a subscription management center and in the transmitter a digital signal generator, a circuit for the formation of digital messages and a data broadcasting system and in the receiver a subscription card, an extraction circuit for the data, and a circuit for restoring the service key. There is also at least one subscription card loading station connected to the subscription management center.

摘要翻译： 具有访问控制的电视系统包括发射机和接收机。 发射机包括视频信号和声音信号形成电路，用于发送这些信号的装置和使用服务密钥的干扰电路。 每个接收机包括用于接收所发送的信号的装置，用于显示图像和恢复声音的装置，以及连接到接收装置并且与服务密钥一起工作的非混合电路。 它还包括订阅管理中心，并且在发送器中，数字信号发生器，用于形成数字消息的电路和数据广播系统，并且在接收器中，订阅卡，用于数据的提取电路，以及用于恢复数据的电路 服务键。 还有至少一个订阅卡加载站连接到订阅管理中心。

公开(公告)号：US4352094A

公开(公告)日：1982-09-28

申请号：US242623

申请日：1981-03-11

申请人： Michel E. Reneric

发明人： Michel E. Reneric

IPC分类号： H04B1/10 ,  G01R29/00 ,  G01R29/26 ,  H04N17/00 ,  H04N17/02 ,  H03K13/02

CPC分类号： H04N17/02 ,  G01R29/00 ,  G01R29/26

摘要： In the error signal feature sensor of the device, an analog synthesized signal is produced throughout the first portion of each period of the analog noisy test signal to be acquired by means of the digital value of samples memorizing in a random access memory and a digital-to-analog converter. The noisy signal and the synthesized signal are compared therebetween at predetermined sampling times in predetermined number. The sign and modulus of the error signal in relation to a predetermined threshold voltage are written in the memory. During the second portion of the period without the noisy signal, a processing unit as a microprocessor calculates the new digital values of the samples in term of comparison results and the preceding digital values of the samples in accordance with a particular algorithm. A new comparison and calculation cycle is performed and so on. After acquisition in steady working, the synthesized signal coincides with the average value of the noisy signal at the predetermined sampling times.

摘要翻译： 在装置的误差信号特征传感器中，通过存储在随机存取存储器中的采样的数字值和数字信号特征传感器在模拟噪声测试信号的每个周期的整个第一部分产生模拟合成信号， 模拟转换器。 在预定数量的预定采样时间将噪声信号和合成信号进行比较。 相对于预定阈值电压的误差信号的符号和模数被写入存储器。 在没有噪声信号的周期的第二部分期间，作为微处理器的处理单元根据特定算法根据比较结果和样本的先前数字值来计算样本的新数字值。 执行新的比较和计算周期等。 在稳定采集中，合成信号与预定采样时间的噪声信号的平均值一致。