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公开(公告)号：US4536797A
公开(公告)日：1985-08-20
申请号：US541075
申请日：1983-10-12
IPC分类号： H04N5/445 , H04N5/50 , H04N21/485 , H04N5/44 , H04N5/22
CPC分类号： H04N21/485 , H04N5/44513 , H04N5/50
摘要： As a signal seeking tuner tunes through a number of channels to locate the next active (useable) channel, the display screen of a television receiver is blanked when the receiver is tuned between channels or to an inactive (unuseable) channel for which video signal information is substantially absent. Superimposed over the blanked screen background is a moveable tuning indicator bar, the position of which indicates the channel to which the receiver is tuned. The blanking of the screen prevents the tuning indication from being obscured by background noise.
摘要翻译： 当信号寻求调谐器通过多个通道调谐以定位下一个有效的（可用的）信道时，当接收机在信道之间调谐时，电视接收机的显示屏幕被消隐，或者到视频信号信息的无效（不可用）信道 基本上不存在。 在空白屏幕背景上叠加的是可移动的调谐指示条，其位置指示接收器被调谐到的通道。 屏幕的消隐可防止调谐指示被背景噪音遮蔽。
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公开(公告)号：US4422096A
公开(公告)日：1983-12-20
申请号：US751924
申请日：1976-12-16
申请人： John G. N. Henderson
发明人： John G. N. Henderson
CPC分类号： H03J5/0281
摘要： In a phase locked loop (PLL) tuning system for a television receiver, the capability of tuning channels with RF signals with non-standard frequencies arbitrarily near the respective standard frequencies is provided by making a frequency divider used in the PLL for establishing the frequency relationship of the local oscillator signal to the crystal oscillator signal controllable in a limited range corresponding to a frequency range less than the frequency separation between channels. As one feature of this system the divider is controlled in accordance with predetermined AFT signal conditions. As another feature, the division factor of the divider is initially offset from its nominal value corresponding to the standard frequency for the selected channel and thereafter the frequency of the local oscillator signal is controlled in response to the AFT signal.
摘要翻译： 在用于电视接收机的锁相环（PLL）调谐系统中，通过在PLL中使用用于建立频率关系的分频器来提供利用非标准频率任意接近相应标准频率的RF信号调谐信道的能力 的本地振荡器信号给晶体振荡器信号，在对应于小于频道间的频率间隔的频率范围的有限范围内可控。 作为该系统的一个特点，根据预定的AFT信号条件控制分频器。 作为另一个特征，除法器的分频因子最初偏离其对应于所选信道的标准频率的标称值，此后响应于AFT信号来控制本地振荡器信号的频率。
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公开(公告)号：US4342999A
公开(公告)日：1982-08-03
申请号：US210251
申请日：1980-11-25
摘要： A single-turn loop antenna suitable for inclusion within the cabinet of a television receiver has at least one gap forming a pair of feed terminals. Circuitry connects to the feed terminals for tuning the antenna over at least a portion of the television frequency bands and for coupling signals from the feed terminals to a transmission line. The circuitry provides isolation so the tuning of the antenna by the tuning circuitry is unaffected by the impedance of the transmission line or its terminating impedance and variations thereof. The circuitry is affixed to the loop proximate to the feed terminals, and the transmission line is affixed to the periphery of the loop and departs therefrom at a neutral point located, for example, opposite to the gap.
摘要翻译： 适用于包含在电视接收机的机柜内的单圈环形天线具有形成一对馈电端子的至少一个间隙。 电路连接到馈电端子，用于通过至少一部分电视频带调谐天线，并将信号从馈电端子耦合到传输线。 电路提供隔离，因此调谐电路对天线的调谐不受传输线的阻抗或其终端阻抗及其变化的影响。 电路被固定到靠近馈电端子的环路上，并且传输线被固定到环路的周边，并且位于例如与间隙相对的中性点处。
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公开(公告)号：US4317225A
公开(公告)日：1982-02-23
申请号：US178026
申请日：1980-08-14
CPC分类号： H03J1/0033 , H03J5/0263 , H03J7/28
摘要： In a tuning system for generating a tuning voltage for tuning a television receiver, channel identification apparatus includes a memory for storing binary signals representing boundary voltages having magnitudes corresponding to magnitudes of the tuning voltage between tuning voltage ranges for respective adjacent channels. As the memory locations are addressed, the boundary voltages are compared to the tuning voltages. Control apparatus causes the memory location associated with the next boundary voltage to be addressed and causes channel number apparatus to generate binary signals representing the next channel number when the magnitude of a predetermined one of the boundary voltage associated with an addressed one of the memory locations and the tuning voltage exceeds the magnitude of the other one. Display apparatus displays the channel number represented by the binary signals generated by the channel number apparatus.
摘要翻译： 在用于产生用于调谐电视接收机的调谐电压的调谐系统中，信道识别装置包括用于存储二进制信号的存储器，该二进制信号表示具有对应于相应相邻信道的调谐电压范围之间的调谐电压的幅度的边界电压。 当寻址存储器位置时，将边界电压与调谐电压进行比较。 控制装置使得与下一个边界电压相关联的存储器位置被寻址，并且当与所寻址的存储器位置相关联的边界电压的预定的一个的幅度和 调谐电压超过另一个的幅度。 显示装置显示由通道编号装置产生的二进制信号表示的通道号。
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25.发明授权
公开(公告)号：US4291413A
公开(公告)日：1981-09-22
申请号：US80105
申请日：1979-09-28
CPC分类号： H03J7/22 , H03J1/0033
摘要： A signal seeking tuning system includes provisions for allowing the direct selection of channels. It includes a memory for storing lower and upper boundaries of a tuning control voltage range for each channel which may be selected. When a channel is selected, a microcomputer causes the memory location corresponding to one of the boundaries associated with the selected channel to be addressed and causes a tuning voltage generator to change the magnitude of the tuning control voltage in the direction of the boundary. A comparator determines when the tuning control voltage reaches the boundary. Thereafter, the microcomputer controls a signal seeking operation between the boundaries to tune the RF carrier associated with the selected channel.
摘要翻译： 信号搜索调谐系统包括允许直接选择频道的规定。 它包括用于存储可以选择的每个通道的调谐控制电压范围的下边界和上边界的存储器。 当选择通道时，微型计算机使得与所选通道相关联的边界之一对应的存储器位置被寻址，并使调谐电压发生器改变沿着边界方向的调谐控制电压的大小。 比较器确定调谐控制电压何时到达边界。 此后，微机控制边界之间的信号寻找操作，以调谐与所选频道相关联的RF载波。
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