公开(公告)号：WO1997048227A1

公开(公告)日：1997-12-18

申请号：PCT/US1997009004

申请日：1997-05-28

Applicant: ZENITH ELECTRONICS CORPORATION

Inventor： ZENITH ELECTRONICS CORPORATION ,  KRISHNAMURTHY, Gopalan ,  TURNER, Rudolf

IPC: H04N05/38

CPC classification number: H04N5/4401 ,  H04L27/02 ,  H04N5/21

Abstract: A VSB mode detection circuit (22) with a comb filter (20) solves the potential problem of lockout in a situation where a VSB mode signal is being received, with the comb filter being effective, and a change in signal mode suddenly occurs. The arrangement inhibits the first two bytes of the three byte mode information, which two bytes are unspecified for all except the 8 VSB terrestrial mode, and replaces them with zero data. In another embodiment, the 12 symbol delay in the comb filter is bypassed with the complement of the input data for the third byte. When the 8 VSB terrestrial mode has been confidently determined to exist, the inhibition of the first and second bytes (and the inversion of the bypassed third byte) is removed in alternate fields to permit normal comb filter operation.

Abstract translation: 具有梳状滤波器（20）的VSB模式检测电路（22）在梳状滤波器有效的情况下解决了在接收VSB模式信号的情况下的锁定的潜在问题，并且信号模式的变化突然发生。 该布置禁止三字节模式信息的前两个字节，除了8个VSB地面模式之外，所有这两个字节都是未指定的，并将其替换为零数据。 在另一个实施例中，梳状滤波器中的12符号延迟被第三字节的输入数据的补码旁路。 当已经自信地确定8 VSB地面模式存在时，在交替的场中去除第一和第二字节的禁止（以及旁路的第三字节的反转），以允许正常的梳状滤波器操作。

公开(公告)号：WO1997037470A1

公开(公告)日：1997-10-09

申请号：PCT/US1997005120

申请日：1997-03-31

Applicant: ZENITH ELECTRONICS CORPORATION

Inventor： ZENITH ELECTRONICS CORPORATION ,  WILLMING, David, A.

IPC: H04L25/34

CPC classification number: H04L25/03273 ,  H04L25/03324 ,  H04L2025/03382

Abstract: A data processor develops a data signal which has a plurality of multi-level symbols. The data processor, in response to each of the symbols, determines the lowest path metric characterizing the data signal, and select one of a plurality of sets of slice values in response to the lowest path metric. A slicer (82, 82') responds to the selected set of slice values by slicing the multi-level symbols. There may be only two sets of slice values in the plurality of sets of slice values, wherein each of the only two sets has three slice levels. Alternatively, there may be only five sets of slice values in the plurality of sets of slice values, wherein each of the only five sets has five slice levels. As a still further alternative, there may be only two sets of slice values in the plurality of sets of slice values, wherein each of the only two sets has a minimum of six slice levels.

Abstract translation: 数据处理器开发具有多个多电平符号的数据信号。 响应于每个符号，数据处理器确定表征数据信号的最低路径度量，并响应于最低路径量度选择多个片值集合中的一个。 限幅器（82,82'）通过对多级符号进行切片来对所选择的片段值进行响应。 在多组切片值中可能只有两组切片值，其中仅两组中的每一组具有三个切片级别。 或者，在多组切片值中可能只有五组切片值，其中仅五组中的每一组具有五个切片级别。 作为更进一步的替代方案，在多个切片值集合中可能只有两组切片值，其中仅两组中的每一个具有最少六个切片级别。

公开(公告)号：WO1996002100A1

公开(公告)日：1996-01-25

申请号：PCT/US1995008174

申请日：1995-06-29

Applicant: ZENITH ELECTRONICS CORPORATION

Inventor： ZENITH ELECTRONICS CORPORATION ,  CITTA, Richard, W. ,  WILLMING, David, A.

IPC: H04L25/03

CPC classification number: H04L1/0054 ,  H04L27/3416 ,  H04N5/4401

Abstract: A trellis coded modulation system comprises a source of successive 2-bit data symbols X1, X2 arranged in a frame format wherein each frame comprises a plurality of data segments each including a plurality of groups of interleaved data symbols. Each group of interleaved data symbols is separately coded by a precoder (32a) and convolution encoder (32b) to derive coded output symbols Z0, Z1, Z2, which are mapped to respective 8-level symbols for transmission together with periodically generated frame and segment sync symbols. The received signal may be filtered by a linear filter (42), e.g. a comb filter (42), to reduce co-channel interference and each group of filtered symbols is applied to a respective first Viterbi decoder (44) for estimating data bits X1, X2. Each first decoder (44) preferably comprises a reduced complexity Viterbi decoder (44) responsive to a partial representation of the state of the linear filter (42). Each group of received symbols may also be directly applied to a respective second Viterbi decoder (46) for estimating data bits X1 X2. Estimated data bits X1 X2 from the first or second decoders (44 or 46) are selected for further processing.

Abstract translation: 网格编码调制系统包括以帧格式布置的连续2位数据符号X1，X2的源，其中每个帧包括多个数据段，每个数据段包括多组交织的数据符号。 每组交织的数据符号由预编码器（32a）和卷积编码器（32b）单独地编码，以得到编码的输出符号Z0，Z1，Z2，其被映射到相应的8级符号以及周期性地产生的帧和段 同步符号 所接收的信号可以被线性滤波器（42）滤波，例如， 用于减少同频道干扰的梳状滤波器（42）和每组经滤波的符号被施加到用于估计数据位X1，X2的相应的第一维特比解码器（44）。 每个第一解码器（44）优选地包括响应于线性滤波器（42）的状态的部分表示的复杂度降低的维特比解码器（44）。 每组接收的符号也可以直接应用于相应的第二维特比解码器（46），用于估计数据位X1 X2。 来自第一或第二解码器（44或46）的估计数据位X1 X2被选择用于进一步处理。

公开(公告)号：WO1995027371A1

公开(公告)日：1995-10-12

申请号：PCT/US1995003754

申请日：1995-03-31

Applicant: ZENITH ELECTRONICS CORPORATION

Inventor： ZENITH ELECTRONICS CORPORATION ,  KRISHNAMURTHY, Gopalan ,  MYCYNEK, Victor, G. ,  SGRIGNOLI, Gary, J.

IPC: H04N05/455

CPC classification number: H04N5/455

Abstract: A dual mode AGC system for a television receiver in which data is in the form of symbols occurring at a fixed symbol rate. The symbols are sent in successive data segments, each having a sync character. Enablement of an AFC Defeat signal defines an initial interval during which the IF gain is maximum. When the AFC Defeat signal becomes inactive, the receiver is operated in a non-coherent mode in which the gain of the IF amplifier is reduced incrementally whenever the IF signal exceeds a clipping level for a period of eight successive symbol clocks. Upon a segment synclock condition occurring, a normal coherent mode is entered in which the AGC responds to a signal characteristic, i.e. data segment sync. The rate of gain change available in the non-coherent AGC mode is much greater than that in the normal coherent AGC mode.

Abstract translation: 一种用于电视接收机的双模AGC系统，其中数据是以固定符号速率发生的符号的形式。 符号在连续的数据段中发送，每个段具有同步字符。 启用AFC失败信号定义了IF增益最大的初始间隔。 当AFC失败信号变为无效时，接收机以非相干模式工作，其中每当IF信号在八个连续的符号时钟周期内超过限幅电平时，IF放大器的增益逐渐减小。 在发生段同步状态时，进入正常相干模式，其中AGC响应信号特性，即数据段同步。 在非相干AGC模式下可用的增益变化率远大于正常相干AGC模式。

公开(公告)号：WO1990010946A1

公开(公告)日：1990-09-20

申请号：PCT/US1990001134

申请日：1990-02-28

Applicant: ZENITH ELECTRONICS CORPORATION

Inventor： ZENITH ELECTRONICS CORPORATION ,  TONG, Hua-Sou

IPC: H01J29/07

CPC classification number: H01J9/142 ,  H01J29/07 ,  H01J2229/0722 ,  H01J2229/0783

Abstract: The power handling capacity of nickel-iron-based flat tensioned foil shadow masks for flat faceplate cathode ray tubes (CRTs) is enhanced by providing the flat tensioned mask (FTM) with a thin surface layer which is enriched in nickel, which is converted to a nickel phosphide compound. The nickel phosphide surface layer is formed on the mask by immersing the mask in a first bath of a strong reducing acid followed by immersing the mask in a second strong reducing acid having an effective amount of hypophosphite ion. The thin surface layer of a nickel phosphide compound increases the FTM emissivity and reduces FTM doming at high electron beam energies. The nickel phosphide compound may be stabilized in the frit-lehr cycle during CRT assembly or in a separate heating operation.

Abstract translation: 通过提供具有富镍的薄表面层的平面张力掩模（FTM）来增强用于平板阴极射线管（CRT）的镍铁平面张紧箔阴影掩模的功率处理能力，其被转换为 一种磷化镍化合物。 通过将掩模浸入强还原酸的第一浴中，然后将掩模浸入具有有效量的次磷酸根离子的第二强还原酸中，在掩模上形成镍磷化物表面层。 磷化镍化合物的薄表层增加了FTM辐射率，并降低了在高电子束能量下的FTM穹隆。 在CRT组装期间或在单独的加热操作中，磷化镍化合物可以在玻璃料循环中稳定。

公开(公告)号：WO1989009481A1

公开(公告)日：1989-10-05

申请号：PCT/US1989001204

申请日：1989-03-23

Applicant: ZENITH ELECTRONICS CORPORATION

Inventor： ZENITH ELECTRONICS CORPORATION ,  TONG, Hua-Sou

IPC: H01J29/07

CPC classification number: H01J29/07 ,  H01J9/146 ,  H01J2229/0722

Abstract: The power handling capacity of non iron-based flat tensioned foil shadow masks for flat faceplate cathode ray tubes (CRTs) is enhanced by providing the flat tensioned mask (FTM) with a thin outer layer of iron, which is converted to iron oxide by blackening, or heating. The iron layer, which is preferably at least 0.04 mil thick, is deposited on the FTM by electroplating in a ferrous ammonium sulfate bath either before or after chemical etching of the FTM. The thin iron layer increases FTM emissivity and reduces FTM doming at high electron beam energies. The iron coating may be blackened in the frit-like cycle during CRT assembly or in a separate heating operation. A blackened outer layer of cobalt may also be used to increase FTM emissivity.

Abstract translation: 通过提供具有薄的外层铁的平坦张力掩模（FTM）来增强平板式阴极射线管（CRT）的非铁性平面张力箔荫罩的功率处理能力，其通过变黑转化为氧化铁 ，或加热。 优选至少0.04密耳厚的铁层通过在化学蚀刻FTM之前或之后通过电镀在硫酸亚铁铵浴中而沉积在FTM上。 薄铁层增加了FTM发射率，并降低了在高电子束能量下的FTM穹顶。 在CRT组装期间或在单独的加热操作中，铁涂层可能在玻璃料状循环中变黑。 也可以使用黑色的钴外层来增加FTM发射率。

公开(公告)号：WO1988010006A1

公开(公告)日：1988-12-15

申请号：PCT/US1988001852

申请日：1988-06-07

Applicant: ZENITH ELECTRONICS CORPORATION

Inventor： ZENITH ELECTRONICS CORPORATION ,  ADLER, Robert ,  DESMARES, Peter, C.

IPC: H01J29/07

CPC classification number: H01J29/07 ,  H01J2229/0744

Abstract: A cathode ray tube (12) which includes a face-plate (16) having on its inner surface a centrally disposed phosphor screen (18), and a flat color selection electrode (35) supported in tension, spaced from the screen. The electrode (35) has a central apertured portion and a peripheral portion, and is susceptible to vibration. A vibration damping system (62) is located on the peripheral portion of the electrode for damping vibrations in the electrode.

公开(公告)号：WO1988003326A2

公开(公告)日：1988-05-05

申请号：PCT/US1987002869

申请日：1987-10-28

Applicant: ZENITH ELECTRONICS CORPORATION

Inventor： ZENITH ELECTRONICS CORPORATION ,  FENDLEY, James, R. ,  STEINER, Johann ,  STRAUSS, Paul ,  GREINER, Siegfried, M. ,  KRANER, James, L.

IPC: H01J29/07

CPC classification number: H01J29/073 ,  H01J2229/0722

Abstract: An improved front assembly for a color cathode ray tube having a tension foil shadow mask. The faceplate of the tube has on its inner surface a centrally disposed phosphor screen surrounded by a peripheral sealing area adapted to mate with a funnel. A shadow mask support structure (34) is provided for supporting a shadow mask in tension on the structure and spacing the shadow mask from the screen. The support structure includes an undulated member (60) surrounding the phosphor screen which member can take a number of forms including a strip defining a bottom sinuous edge (64) for securing the support structure to the faceplate and a top sinuous edge (62) for securing the shadow mask to the support structure. A cap (68) may be provided for securement to the top sinuous edge of the undulated strip to provide a land for securing the shadow mask to the support structure. Alternatively, the undulated member can be formed with peaks (66a) and valleys (66b) which are flattened in a common plane and provide means for securing the support structure to the faceplate. The peaks are flattened in a common plane and provide means for securing the shadow mask to the support structure. In a further modification, the support member includes an upper, flattened ridge for securing the shadow mask to the support structure. A plurality of legs depend from the ridge and at least a series of the legs is flared outwardly from one side of the ridge to facilitate securing the support structure to the faceplate and to stabilize the support structure under the tension of the shadow mask. Preferably, the mask support structure physically penetrates the faceplate for permanent, cementless anchoring of the structure to the faceplate. The embedment of the mask support structure is of such depth as to cause the structure to resist tensile forces created by the mask. Also disclosed is a process for securing a support structure for a tensed foil shadow mask to a glass faceplate.

Abstract translation: 一种用于具有张力箔荫罩的彩色阴极射线管的改进的前组件。 管的面板在其内表面上具有由适于与漏斗配合的周边密封区域围绕的居中设置的荧光屏。 提供了荫罩支撑结构（34），用于在结构上支撑荫罩，并将荫罩与屏幕间隔开。 支撑结构包括围绕荧光屏的起伏构件（60），该构件可以采取多种形式，包括限定底部弯曲边缘（64）的条带，用于将支撑结构固定到面板上，以及顶部弯曲边缘（62），用于 将荫罩固定到支撑结构上。 可以提供帽（68）用于固定到波纹带的顶部弯曲边缘，以提供用于将荫罩固定到支撑结构的平台。 或者，波纹构件可以形成为在公共平面中被平坦化并且提供用于将支撑结构固定到面板的装置的峰（66a）和谷（66b）。 峰在普通平面中变平，并提供用于将荫罩固定到支撑结构的装置。 在进一步的改进中，支撑构件包括用于将荫罩固定到支撑结构的上部平坦的脊。 多个腿从脊部取向，并且至少一系列的腿从脊的一侧向外张开，以便于将支撑结构固定到面板并且在荫罩的张力下稳定支撑结构。 优选地，面罩支撑结构物理地穿透面板，用于将结构永久地，无胶结地锚定到面板。 掩模支撑结构的嵌入具有使得结构抵抗由掩模产生的张力的深度。 还公开了一种用于将用于张紧箔片荫罩的支撑结构固定到玻璃面板的方法。

公开(公告)号：WO1986005647A1

公开(公告)日：1986-09-25

申请号：PCT/US1986000548

申请日：1986-03-14

Applicant: ZENITH ELECTRONICS CORPORATION

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

IPC: H04N07/167

CPC classification number: H04N7/1713

Abstract: A television signal transmission system comprising a headend unit (10) including a pair of SAW filters (22, 24) having equal delays, one filter (22) having amplitude and normalized phase versus frequency response characteristics continuously varying between about -6 db and 180 degrees at the picture carrier frequency and zero db and zero degrees at the sound carrier frequency of the television signal, the second filter (24) having substantially flat amplitude and normalized phase responses between the picture and sound carrier frequencies. An RF video signal is applied to both filters (22, 24), the output of the first filter (22) being selected for transmission during at least a portion of the horizontal blaking intervals of the television signal with the output of the second filter (24) otherwise being selected for transmission. The transmitted signal is received by a decoder (66) including a bi-phase stable phase modulation detector (80) and third and fourth SAW filters (72, 74) having response characteristics complementary to the headend filters (22, 24). The received signal is applied to both the third and fourth SAW filters (72, 74) whose outputs are selectively switched to an output terminal (84) in response to the phase modulation detector (80) for restoring the received signal.

公开(公告)号：WO1998023092A1

公开(公告)日：1998-05-28

申请号：PCT/US1997020800

申请日：1997-11-13

Applicant: ZENITH ELECTRONICS CORPORATION

Inventor： ZENITH ELECTRONICS CORPORATION ,  TURNER, Rudolf

IPC: H04N07/24

CPC classification number: H04N21/4302 ,  H04N19/85

Abstract: A digital television signal includes successive frames of two fields each comprising 313 data segments with the first data segment in each field functioning as a field sync. The field sync segment comprises a 511 pseudo-random number (PN) sequence and three 63 PN sequences, with the middle one of the 63 PN sequences alternating polarity in successive fields. A reference data segment is compared with the 511 PN sequence in each data segment and the data segment with the least number of errors is identified as the first data segment in the field. The corresponding portion of the reference segment is compared with the middle 63 PN sequences in the identified first data segments and that with the least number of errors is determined to be the first segment in the frame. Confidence counters are used to assure reliable determinations.

Abstract translation: 数字电视信号包括两个场的连续帧，每个帧包括313个数据段，每个场中的第一数据段用作场同步。 场同步段包括511伪随机数（PN）序列和三个63个PN序列，其中63个PN序列中的一个在连续的字段中交替极性。 参考数据段与每个数据段中的511 PN序列进行比较，具有最少错误数量的数据段被识别为现场的第一个数据段。 将参考片段的对应部分与所识别的第一数据片段中的中间63个PN序列进行比较，并将最小数量的错误确定为帧中的第一片段。 信心计数器用于确保可靠的确定。