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公开(公告)号：US4454543A
公开(公告)日：1984-06-12
申请号：US318756
申请日：1981-11-06
摘要： A means for coding and decoding video signals by the application of one of a plurality of available scrambling signals includes means for comparing the brightness level during a predetermined time period of the video signal with the brightness level of the video signal over the succeeding predetermined time period. There are means for changing from one scrambling signal to another if the difference between brightness levels in successive predetermined time periods exceeds a given value.
摘要翻译： 通过应用多个可用加扰信号之一对视频信号进行编码和解码的装置包括用于将视频信号的预定时间段内的亮度级别与随后的预定时间段内的视频信号的亮度级别进行比较的装置 。 如果在连续的预定时间段内的亮度级别之间的差值超过给定值，则存在从一个加扰信号变为另一个的装置。
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公开(公告)号：US4323922A
公开(公告)日：1982-04-06
申请号：US104147
申请日：1979-12-17
IPC分类号： H04N7/16
CPC分类号： H04N7/162
摘要： A converter/decoder for use in subscription television includes means for converting any input TV channel to a predetermined output channel. Decoding means are connected to the converter at its output for decoding the selected output channel. The decoder is enabled in response to data carried on the TV signal which describes the program level of the particular selected channel. The means for enabling the decoder includes a comparison circuit which compares the television signal program level data with authorization data and performs an enabling function when there is correspondence between the two data entries. The authorization data may be received by the converter/decoder simultaneously with the program level data, but at a frequency other than that of the television signal, for example, at a frequency in the FM band.
摘要翻译： 用于订阅电视的转换器/解码器包括用于将任何输入TV信道转换成预定输出信道的装置。 解码装置在其输出处连接到转换器，用于对所选择的输出通道进行解码。 解码器响应于描述特定所选频道的节目级别的TV信号上承载的数据被使能。 用于启用解码器的装置包括比较电路，其将电视信号节目级数据与授权数据进行比较，并且当两个数据条目之间存在对应关系时执行启用功能。 授权数据可以由转换器/解码器与节目级数据同时接收，但以与电视信号不同的频率，例如以FM频带中的频率接收。
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公开(公告)号：US5155597A
公开(公告)日：1992-10-13
申请号：US619219
申请日：1990-11-28
CPC分类号： G01C11/02 , H04N3/1525 , H04N3/1568 , H04N5/33 , H04N5/335
摘要： An electro-optical area array reconnaissance detector is disclosed which accomplishes forward motion compensation electronically and without moving parts. The array is made of photo-sensitive cells arranged in rows and columns, the columns being organized into one or more column groups. Charge packets collected in the cells representing scene information are transferred down the columns at the same rate as the image motion in the plane of the array. In a side oblique reconnaissance scenario, the columns may be organized into 16 column groups, each column group having its own charge transfer rate corresponding to the image motion rate in that column group.
摘要翻译： 公开了一种电光区域阵列侦察探测器，其通过电子方式实现向前运动补偿，而不需要移动部件。 阵列由以行和列排列的感光细胞组成，列被组织成一个或多个列组。 在表示场景信息的单元格中收集的收费分组以与阵列的平面中的图像运动相同的速率向下传送。 在侧面倾斜侦察场景中，列可以被组织成16列组，每个列组具有与该列组中的图像运动速率相对应的其自己的电荷传送速率。
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公开(公告)号：US4633316A
公开(公告)日：1986-12-30
申请号：US671271
申请日：1984-11-14
申请人： Dennis E. Burke , John A. Lund
发明人： Dennis E. Burke , John A. Lund
摘要： A cable converter produces a 4.5 MHz intercarrier sound signal from a received television signal for application to one input of a phase lock loop circuit, the other input of which is supplied from a voltage controlled oscillator producing a regenerated 4.5 MHz intercarrier signal. The output of the phase lock loop is supplied through a loop filter to the input of the voltage controlled oscillator to control its frequency. The regenerated 4.5 MHz intercarrier signal is thus stabilized by the received 4.5 MHz intercarrier signal.
摘要翻译： 电缆转换器从接收到的电视信号产生4.5MHz的载波间声音信号，以应用于锁相环电路的一个输入，其另一个输入是从产生再生的4.5MHz载波间信号的压控振荡器提供的。 锁相环的输出通过环路滤波器提供给压控振荡器的输入，以控制其频率。 因此，再生的4.5MHz载波间信号被接收的4.5MHz载波间信号稳定。
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公开(公告)号：US5140930A
公开(公告)日：1992-08-25
申请号：US758185
申请日：1991-09-12
申请人： John A. Lund
发明人： John A. Lund
CPC分类号： B63B1/20
摘要： A planing hull of a water craft including side keels and a center keep. A downwardly open chamber is defined rearwardly of the center keel and is flanked on either side by the side keels. The chamber confines a cushion of air which supports the hull in the planing mode, air supply to the chamber being wholly via the underside of the hull by being channelled between the keels without the use of air vents which open into the chamber. The absence of air vents provides improved drag at medium and low speeds.
摘要翻译： PCT No.PCT / AU88 / 00121 Sec。 371日期1989年12月29日第 102（e）日期1989年12月19日PCT提交1988年4月28日PCT公布。 出版物WO88 / 08387 日期：1988年11月3日。 向下敞开的腔室被限定在中心龙骨的后面，并且在侧壁上由侧龙骨侧面。 该室限制了一种空气缓冲垫，其以刨削模式支撑船体，通过在龙骨之间引导而完全通过船体下侧的空气供应，而不使用通向室中的通风孔。 没有通风口在中低速下提供改进的阻力。
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公开(公告)号：US4636853A
公开(公告)日：1987-01-13
申请号：US564973
申请日：1983-12-21
申请人： Ronald L. Forbes , John A. Lund
发明人： Ronald L. Forbes , John A. Lund
CPC分类号： H04N7/167
摘要： A multi-mode audio scrambling system includes an all-pass filter and a 90 degree phase shift circuit for supplying balanced modulators with 90 degree phase displaced audio information and 90 degree phase displaced carriers derived from the horizontal line frequency of a television receiver for producing a single sideband, suppressed carrier audio spectrum. A plurality of offset frequencies are derived from the horizontal line frequency and are used to further modulate the resultant signal to produce a single sideband displaced audio spectrum. A logic circuit selects the offset frequency (mode) in response to vertical interval signals, video inversion signals and audio tone or data signals. The final output is thus scrambled in different modes with different offset frequencies. A complementary unscrambling system is also described.
摘要翻译： 多模式音频加扰系统包括全通滤波器和90度相移电路，用于向具有90度相位偏移音频信息的平衡调制器和从电视接收机的水平线频率导出的90度相移位移载波提供用于产生 单边带，抑制载波音频。 从水平线频率导出多个偏移频率，并且用于进一步调制所得到的信号以产生单个边带位移音频频谱。 逻辑电路响应于垂直间隔信号，视频反转信号和音频音调或数据信号来选择偏移频率（模式）。 因此，最终输出在具有不同偏移频率的不同模式下被加扰。 还描述了一种互补的解扰系统。
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公开(公告)号：US4654705A
公开(公告)日：1987-03-31
申请号：US567108
申请日：1983-12-30
IPC分类号： H04N7/167
CPC分类号： H04N7/167
摘要： A two channel audio scrambling circuit for a television signal encoding system includes synchronized digital carrier switching means for deriving two suppressed carrier, switched audio signals that are 90 degrees apart, and combining them into a single output signal. A digital phase shifter, supplied with a carrier related to the horizontal line frequency develops properly phased outputs for controlling electronic switches to produce two phase displaced digital carrier switching signals. A plurality of scrambling modes are determined by logic means under control of a vertical interval signal, a video inversion signal and a tone signal input for controlling the digital phase shifter to change the carrier frequency. Complementary decoding circuitry for recovering the so-encoded audio signals is also described.
摘要翻译： 用于电视信号编码系统的双声道音频加扰电路包括：同步的数字载波切换装置，用于导出两个相隔90度的被抑制的载波切换音频信号，并将它们组合成单个输出信号。 提供有与水平线频率相关的载波的数字移相器产生适当的相位输出，用于控制电子开关以产生两个相移位移的数字载波切换信号。 多个加扰模式由逻辑装置在垂直间隔信号，视频反转信号和音调信号输入的控制下确定，用于控制数字移相器改变载波频率。 还描述了用于恢复如此编码的音频信号的互补解码电路。
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