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公开(公告)号：US3943449A
公开(公告)日：1976-03-09
申请号：US504638
申请日：1974-09-09
CPC分类号： H03J7/08 , H03J5/0245
摘要： An electronic all channel television tuning system has a presettable counter for deriving the number of the receivable television channel by counting, on a continuing sample basis, the varactor diode tuner local oscillator frequency. The derived channel number is supplied as an input of a comparator which includes separate tens and units channel number comparison sections. A channel number selector supplies an encoded desired channel number to another input of the comparator and to a frequency band decoder which establishes appropriate preset information for the counter. The system local oscillator frequency is varied by a voltage ramp circuit having two pairs of matched current sources and sinks of different capacity for supplying current, through respective transmission gates, to charge or discharge a tuning capacitor at different rates. A difference in the tens section of the comparator activates the transmission gates for both the larger and smaller capacity source-sink pairs, producing the high ramp speed. After equality in the tens digits only one of the small capacity source-sink pair is activated, under control of the units section of the comparator, to produce the low ramp speed.
摘要翻译： 电子全频道电视调谐系统具有可预测的计数器，用于通过以连续采样为基础计算变容二极管调谐器本地振荡器频率来导出可接收电视频道的数量。 导出的通道号作为比较器的输入提供，该比较器包括单独的十位和单位通道数比较部分。 信道号选择器将编码的期望信道号提供给比较器的另一个输入端，并向频带解码器提供计数器的适当的预设信息。 系统本地振荡器频率由具有两对不同容量的匹配电流源和吸收源的电压斜坡电路变化，以通过相应的传输门提供电流，以不同速率对调谐电容器进行充电或放电。 比较器的十位部分的差异激活了较大和较小容量的源极 - 阱对的传输门，产生高的斜坡速度。 在十位数字相等之后，在比较器的单元部分的控制下，只有一个小容量源 - 汇对被激活，以产生低斜坡速度。
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公开(公告)号：US4156199A
公开(公告)日：1979-05-22
申请号：US796273
申请日：1977-05-12
CPC分类号： H03J7/06
摘要： A television window tuning system has duty cycle adjustment means for selectively varying the duty cycle of the tuner associated local oscillator signal. Increasing the duty cycle of the local oscillator signal effectively shifts the tuning window in frequency space in one direction while decreasing the duty cycle shifts the window in the opposite direction. In one embodiment of the invention, the duty cycle adjustment means is set for producing a 0% duty cycle oscillator signal for deriving a tuning window particularly adaptable for use with conventional AFC systems.
摘要翻译： 电视窗调谐系统具有用于选择性地改变调谐器相关的本地振荡器信号的占空比的占空比调整装置。 增加本地振荡器信号的占空比有效地使调谐窗在一个方向上的频率空间中移动，同时减小占空比使窗口沿相反方向移动。 在本发明的一个实施例中，占空比调整装置被设置用于产生0％占空比振荡器信号，用于导出特别适用于常规AFC系统的调谐窗口。
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公开(公告)号：US4292650A
公开(公告)日：1981-09-29
申请号：US88902
申请日：1979-10-29
CPC分类号： H04N7/1675
摘要： A system for selectively addressing a plurality of television receivers, each of the receivers being identified by a unique n-bit address code, comprises means for transmitting a prefix code which is common to the p most significant bits of a group of address codes during a first horizontal scanning line of the vertical interval of a broadcast television signal. A plurality of suffix codes, each comprising the n-p least significant bits of a different one of the n-bit address codes of the group, are transmitted during each of a series of subsequently occurring horizontal scanning lines of the vertical interval for completely identifying the address codes of the group. Each television receiver includes a decoder for identifying when its associated address code has been transmitted in the form of a corresponding prefix and suffix code.
摘要翻译： 一种用于选择性地寻址多个电视接收机的系统，每个接收机由唯一的n位地址码标识，包括用于在一段时间内发送一组地址码的p个最高有效位的前缀码的装置 广播电视信号的垂直间隔的第一水平扫描线。 在垂直间隔的一系列随后出现的水平扫描行中的每一个中，发送多个后缀码，每个后缀码包括该组的n位地址码中不同的一个n位地址码的np个最低有效位，以完全识别该地址 组的代码。 每个电视接收机包括用于识别何时以相应的前缀和后缀码的形式发送其相关联的地址码的解码器。
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公开(公告)号：US4558360A
公开(公告)日：1985-12-10
申请号：US538259
申请日：1983-10-03
CPC分类号： H04N7/1713
摘要： A suppressed sync television decoder includes a phase locked horizontal oscillator for controlling operation of a suppressed sync detector which supplies a circuit for restoring suppressed sync in a television signal. The restored sync is coupled to the phase locked oscillator and to a first four bit counter. A second four bit counter is supplied with the horizontal oscillator signal and inhibits counting in both counters when it counts 16. A reset signal corresponding to the end of the vertical interval initializes both counters. If the number of sync pulses counted by the second counter is less than 16, an error signal is produced. Thirty-two error signals result in generation of a defeat pulse to unlock the oscillator.
摘要翻译： 抑制同步电视解码器包括锁相水平振荡器，用于控制抑制同步检测器的操作，该抑制同步检测器提供用于恢复电视信号中抑制同步的电路。 恢复的同步耦合到锁相振荡器和第一个四位计数器。 第二个四位计数器提供水平振荡器信号，当它计数16时禁止两个计数器的计数。对应于垂直间隔结束的复位信号初始化两个计数器。 如果由第二计数器计数的同步脉冲数小于16，则产生误差信号。 三十二个错误信号导致产生失败脉冲来解锁振荡器。
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公开(公告)号：US4408225A
公开(公告)日：1983-10-04
申请号：US280722
申请日：1981-07-06
CPC分类号： H04N7/1713
摘要： A decoder is responsive to a decode authorization signal for unscrambling a broadcast RF television signal having randomly suppressed horizontal blanking and synchronization pulses. The decoder comprises a tuner having a gated automatic gain control circuit and a video detector responsive thereto for developing a baseband video signal corresponding to the broadcast television signal. The decoder further comprises a sync restoration circuit developing a standard horizontal synchronization pulse in response to each suppressed horizontal blanking pulse of the baseband video signal, the standard horizontal synchronization pulses being continuously combined with the baseband video signal for operating the automatic gain control circuit and being coupled for unscrambling the baseband video signal only in response to the decode authorization signal.
摘要翻译： 解码器响应于解码授权信号来解扰随机抑制的水平消隐和同步脉冲的广播RF电视信号。 解码器包括具有门控自动增益控制电路的调谐器和响应于此的视频检测器，用于开发对应于广播电视信号的基带视频信号。 解码器还包括响应于基带视频信号的每个抑制的水平消隐脉冲开发标准水平同步脉冲的同步恢复电路，标准水平同步脉冲与用于操作自动增益控制电路的基带视频信号连续组合，并且 用于仅响应于解码授权信号来解扰基带视频信号。
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公开(公告)号：US4317228A
公开(公告)日：1982-02-23
申请号：US84707
申请日：1979-10-15
摘要： A television receiver includes a frequency synthesizer phase lock loop operated in a time multiplexed manner to provide two tuning signals for tuning a received television signal. The two tuning signals are developed at the outputs of first and second voltage controlled local oscillators alternately operated in response to a phase detector which is reset at the beginning of each alternate operation.
摘要翻译： 电视接收机包括以时间复用方式操作的频率合成器锁相环，以提供用于调谐所接收的电视信号的两个调谐信号。 两个调谐信号在第一和第二电压控制的本地振荡器的输出处被开发，该第一和第二电压控制的本地振荡器响应于在每个替换操作开始时复位的相位检测器交替地操作。
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公开(公告)号：US4759061A
公开(公告)日：1988-07-19
申请号：US14893
申请日：1987-02-13
IPC分类号： H04N7/167
CPC分类号： H04N7/167
摘要： A technique for toggling the coding mode in a television signal encoder comprises establishing a rectangular window defining a relatively small and substantially centrally located portion of the field image intervals of the television signal. The coding mode of the encoder is toggled whenever the APL of the television signal occurring during the window exhibits a change for successive video fields exceeding a predetermined threshold level.
摘要翻译： 一种用于在电视信号编码器中切换编码模式的技术包括建立矩形窗口，其定义电视信号的场图像间隔的相对较小且基本中心定位的部分。 每当窗口中发生的电视信号的APL对于超过预定阈值电平的连续视频场的变化表现时，编码器的编码模式被切换。
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公开(公告)号：US4425647A
公开(公告)日：1984-01-10
申请号：US379374
申请日：1982-05-17
CPC分类号： H04B10/114 , G08C19/28 , G08C23/04 , H03J9/06 , H04L25/4902
摘要： A remote control system for a television receiver includes a transmitter and a receiver, the transmitter being adapted for transmitting a single word multibit code identifying a selected function of the television receiver. Each bit of the transmitted multibit code comprises a first occurring data signal representing a selected logic state followed immediately in time succession by a second occurring data signal representing the complementary logic state, the first and second data signals comprising a single pulse representing a first logic state or a grouping of at least two relatively closely spaced pulses representing a second logic state, whereby each transmitted bit comprises the same number of pulses. The remote control receiver includes apparatus for testing the parity relationship of the first and second occurring data signals of each bit of the received multibit code and for controlling the selected function in response to each tested bit being characterized by a condition of parity.
摘要翻译： 一种用于电视接收机的遥控系统包括发射机和接收机，该发射机适用于发送识别电视接收机所选功能的单字多位码。 所发送的多位代码的每一位包括表示紧接在时间依次中的表示互补逻辑状态的第二出现数据信号的选定逻辑状态的第一出现数据信号，第一和第二数据信号包括表示第一逻辑状态的单个脉冲 或表示第二逻辑状态的至少两个相对紧密间隔的脉冲的分组，由此每个发送的比特包括相同数量的脉冲。 遥控接收机包括用于测试接收到的多位代码的每个比特的第一和第二出现的数据信号的奇偶校验关系的装置，并且用于响应于每个被测试的比特以奇偶校验的状态来控制所选择的功能。
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公开(公告)号：US4377006A
公开(公告)日：1983-03-15
申请号：US57053
申请日：1979-07-12
IPC分类号： H03J9/00 , G08C19/28 , G08C23/04 , H03J9/06 , H04B10/10 , H04L25/49 , H04Q9/14 , H04Q9/16 , H04B9/00
CPC分类号： H04B10/114 , G08C19/28 , G08C23/04 , H03J9/06 , H04L25/4902
摘要： A remote control system for a television receiver includes a transmitter and a receiver, the transmitter being adapted for transmitting a multibit code identifying a selected function of the television receiver wherein the data bits forming the multibit code each comprise a single pulse representing a first logic state and a grouping of at least two relatively closely spaced pulses representing a second logic state. The remote control receiver includes a self-clocking detector for converting the transmitted pulses to a binary logic signal and decoding means responsive to the logic signal for operating the selected television receiver function.
摘要翻译： 一种用于电视接收机的遥控系统包括发射机和接收机，该发射机适用于发送识别电视接收机的选定功能的多位码，其中形成多位码的数据位各自包括表示第一逻辑状态的单个脉冲 以及表示第二逻辑状态的至少两个相对紧密间隔的脉冲的分组。 遥控接收机包括自发时钟检测器，用于将发送的脉冲转换为二进制逻辑信号，以及响应于用于操作所选择的电视接收机功能的逻辑信号的解码装置。
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公开(公告)号：US4598313A
公开(公告)日：1986-07-01
申请号：US666852
申请日：1984-10-31
CPC分类号： H04N7/1716
摘要： An encoded television signal is transmitted in the form of an inverted video component amplitude modulating an RF carrier to a selected percentage of modulation and characterized by inverted reference black and white level components. At the receiver, a decoding signal equal in frequency to and 180 degrees out of phase with the RF carrier is generated and combined with the received signal to provide a decoded television signal. The level of the decoding signal is controlled in response to the difference between the peak detected reference level signals such that the percentage of modulation of the decoded television signal is the same as that characterizing the encoded signal.
摘要翻译： 经编码的电视信号以将RF载波振幅调制为反相的视频分量的形式发送到所选择的调制百分比，并以反相参考黑白电平分量为特征。 在接收机处，产生与RF载波频率相等且相差180度的解码信号，并与接收信号组合以提供解码的电视信号。 响应于峰值检测参考电平信号之间的差异来控制解码信号的电平，使得解码电视信号的调制百分比与表征编码信号的相同。
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