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公开(公告)号：US4390902A
公开(公告)日：1983-06-28
申请号：US315617
申请日：1981-10-28
IPC分类号： H04N5/50
CPC分类号： H04N5/50
摘要： A television (TV) receiver which receives TV signals in a plurality of TV frequency bands includes apparatus for developing an accentuated and uncontaminated on-screen tuning indication. Specifically, a blanking device is responsive to a tuning signal for eliminating the display of a portion of the TV picture for the duration of a pulse signal. The pulse signal is delayed in time relative to a deflection signal by a time related to the tuning signal so that a blanked bar is generated in the TV picture. A tuning indicator device causes a predetermined display unaffected by the TV picture during the blanked portion of the TV picture.
摘要翻译： 在多个TV频带中接收电视信号的电视（TV）接收机包括用于开发突出和未受污染的屏幕上调谐指示的装置。 具体地，消隐装置响应于调谐信号，以消除在脉冲信号的持续时间内的TV图像的一部分的显示。 脉冲信号相对于偏转信号在时间上延迟与调谐信号相关的时间，使得在TV图像中产生消隐的条。 调谐指示器装置在电视画面的空白部分期间引起不受TV图像影响的预定显示。
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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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3.发明授权Signal-seeking tuning system with automatic bandswitching for a television receiver 失效信号调谐系统，具有电视接收机的自动频带切换功能
公开(公告)号：US4398303A
公开(公告)日：1983-08-09
申请号：US326173
申请日：1981-11-30
摘要： A signal-seeking tuning system for a television receiver scans the VHF and UHF signal bands until a present TV channel signal is detected. Tuning voltage is developed by a digital-to-analog converter in response to a binary word stored in an up/down counter. The value of the binary word increases when a scan-up signal is applied and decreases when a scan-down signal is applied. Band signals are automatically sequenced to the next higher frequency band when the binary word "rolls-over" from a maximum to a minimum value, or to the next lower frequency band when the binary word rolls-over from its minimum to its maximum value. Scanning is stopped by inhibiting changing of the binary word when a valid sequence of AFT signals is detected.Thereafter, the tuning voltage is compensated for drifts by incrementing or decrementing the binary word whenever the AFT signal departs from a predetermined condition. This correction is inhibited, however, when the binary word is at its minimum or maximum value so that unwanted bandswitching is avoided.
摘要翻译： 用于电视接收机的信号寻找调谐系统扫描VHF和UHF信号频带，直到检测到当前TV信道信号。 响应于存储在上/下计数器中的二进制字，由数 - 模转换器开发调谐电压。 当施加扫描信号时，二进制字的值增加，并且当施加扫描信号时，该值减小。 当二进制字从最大值转换到最小值时，当二进制字“滚转”时，频带信号自动排序到下一个较高频带，或者当二进制字从最小值翻转到最大值时，到下一个较低频带。 当检测到AFT信号的有效序列时，禁止二进制字的改变来停止扫描。 此后，只要AFT信号偏离预定条件，通过递增或递减二进制字来对调谐电压进行补偿。 然而，当二进制字处于其最小值或最大值时，该校正被禁止，从而避免了不期望的频带切换。
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4.发明授权Signal-seeking tuning system with signal loss protection for a television receiver 失效用于电视接收机的信号丢失保护的信号寻呼调谐系统
公开(公告)号：US4429415A
公开(公告)日：1984-01-31
申请号：US326171
申请日：1981-11-30
CPC分类号： H03J7/28
摘要： A signal-seeking tuning system for a television receiver scans the VHF and UHF signal bands until a present TV channel signal is detected. Tuning voltage is developed by a digital-to-analog converter in response to a binary word stored in an up-down counter. The value of the binary word increases when a scan-up signal is applied and decreases when a scan-down signal is applied. Scanning is stopped by inhibiting changing of the binary word when a valid sequence of AFT signals is detected.Thereafter, the tuning voltage is compensated for drifts by incrementing or decrementing the binary word whenever the AFT signal departs from a predetermined condition. This correction is inhibited, however, when the RF carrier signal is lost so that the desired tuning is not also lost, whereby the selected channel is still tuned when the RF carrier signal reappears.
摘要翻译： 用于电视接收机的信号寻找调谐系统扫描VHF和UHF信号频带，直到检测到当前TV信道信号。 响应于存储在升降计数器中的二进制字，数字 - 模拟转换器产生调谐电压。 当施加扫描信号时，二进制字的值增加，并且当施加扫描信号时，该值减小。 当检测到AFT信号的有效序列时，禁止二进制字的改变来停止扫描。 此后，只要AFT信号偏离预定条件，通过递增或递减二进制字来对调谐电压进行补偿。 然而，当RF载波信号丢失时，该校正被禁止，使得期望的调谐不会丢失，由此当RF载波信号重新出现时所选择的信道仍被调谐。
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5.发明授权Channel identification apparatus useful in a multiband sweep type tuning system 失效信道识别装置，用于多波段扫描型调谐系统
公开(公告)号：US4254506A
公开(公告)日：1981-03-03
申请号：US43765
申请日：1979-05-30
CPC分类号： H03J1/0033 , H03J5/0263 , H03J7/20
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 within a band. Because the tuning voltage characteristics associated with conventional television receivers include separated portions corresponding to respective frequency bands in which the television channels are located, boundary voltages corresponding to the boundaries of the tuning voltage ranges of the highest and lowest frequency channels in each band are also stored. 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. Because the boundary voltages are utilized, the channel identification apparatus, as disclosed, is particularly well suited for use in a signal seeking system.
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与频带内各个相邻信道的调谐电压范围之间的调谐电压的幅度相对应的幅度的边界电压。 由于与常规电视接收机相关联的调谐电压特性包括对应于电视频道所在频带的分离部分，所以与每频带中最高和最低频率信道的调谐电压范围边界对应的边界电压也被存储 。 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边界电压相关联的存储器位置被寻址，并且当与所寻址的一个存储器位置相关联的边界电压的预定的一个的幅度和当存储器位置相关联的边界电压的大小时，使得通道编号装置产生表示下一个通道号的二进制信号 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。 由于利用边界电压，如所公开的那样，信道识别装置特别适用于信号搜索系统。
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6.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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7.发明授权
公开(公告)号：US4387401A
公开(公告)日：1983-06-07
申请号：US305688
申请日：1981-09-25
CPC分类号： H03J5/0263 , H03J1/0033 , H03J7/20
摘要： In a sweep type tuning system capable of sweeping through a desired range of carrier frequencies selectively in one of two directions, a carrier detector includes a discriminator for generating a discriminator signal as the frequency range is swept which has a first amplitude portion when the frequency of a tuned carrier is less than a predetermined nominal value and a second amplitude portion when the frequency of the tuned carrier is greater than the predetermined nominal value. A sequence detector determines the sequence of generation of the first and second portions of the discriminator signal to generate a signal indicating the presence of the tuned carrier. The presence indicating signal is generated when the sweeping takes place in a first direction if the first and then the second portions are sequentially generated and when the sweeping takes place in the second direction if the second and then first portion are sequentially generated.
摘要翻译： 在能够在两个方向中的一个方向上选择性扫描期望范围的载波频率的扫描型调谐系统中，载波检测器包括用于产生鉴频器信号的鉴频器，当频率范围被扫描时，该频率范围具有第一振幅部分，当频率 当调谐载波的频率大于预定标称值时，调谐载波小于预定标称值和第二振幅部分。 序列检测器确定鉴别器信号的第一和第二部分的产生序列，以产生指示调谐载波的存在的信号。 如果顺序地产生第一和第二部分，并且当依次产生第二部分和第二部分时在第二方向上进行扫描，则在第一方向上进行扫描时，产生存在指示信号。
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公开(公告)号：US4410913A
公开(公告)日：1983-10-18
申请号：US315615
申请日：1981-10-28
申请人： Danny Chin , Robert J. Maturo
发明人： Danny Chin , Robert J. Maturo
CPC分类号： H04N5/505
摘要： In television (TV) receivers, the VHF-TV band including channel 2-13 is perceived by most viewers as being a single TV band even though it is in fact partitioned into lower and upper frequency portions, including channels 2-6 and 7-13, respectively, which are separated by a gap. Voltage controlled tuning systems for such TV receivers employ a tuning voltage which varies over substantially the same range of magnitudes from a lower voltage to a higher voltage for each of the frequency portions of the VHF band. Accordingly, conventional channel indicators responsive to the magnitude of the tuning voltage partition the bands to avoid ambiguity in the channel indication. In the present arrangement, a tuning indicator produces an on-screen bar display having a position which is indicative of the selected channel for all VHF channels as if the VHF frequency band was continuous and not partitioned thereby being consistent with the perception of most viewers. Specifically, the tuning indicator includes a divider device for attenuating the tuning voltage when a channel in the lower or upper VHF band is selected, a device for developing an offsetting voltage when the selected channel is in the upper VHF band, and a device for combining the attenuated tuning voltage and the offsetting voltage to develop a control signal which determines the position of the bar on the TV screen.
摘要翻译： 在电视（TV）接收机中，包括频道2-13的VHF-TV频带被大多数观众视为单个TV频带，即使它实际上被划分为下部和上部频率部分，包括频道2-6和7- 13分别由间隙分开。 用于这种TV接收机的电压调节系统采用调谐电压，该调谐电压在VHF频带的每个频率部分的较低电压到较高电压的基本相同的幅度范围内变化。 因此，响应于调谐电压的幅度的常规频道指示器对频带进行分区，以避免信道指示中的歧义。 在本安排中，调谐指示器产生屏幕上的条形显示器，其具有指示所有VHF通道的所选通道的位置，就好像VHF频带是连续的并且不被划分，从而与大多数观看者的感知一致。 具体地，调谐指示器包括用于在选择下VHF频带或下VHF频带中的频道时衰减调谐电压的分频装置，当所选频道处于上VHF频带时用于产生偏移电压的装置，以及用于组合的装置 衰减的调谐电压和偏移电压，以产生确定电视屏幕上的条的位置的控制信号。
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