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公开(公告)号：US5136719A
公开(公告)日：1992-08-04
申请号：US279952
申请日：1988-12-05
申请人： Garold B. Gaskill , Larry H. Mukai
发明人： Garold B. Gaskill , Larry H. Mukai
CPC分类号： H03J1/0033 , H01Q1/27 , H03J7/28
摘要： A wristwatch paging receiver is provided with an antenna matching network that automatically retunes the network at the beginning of a listening interval. During the retuning operation, a control signal is applied to a variable tuning element in the matching network, such as a varactor diode, and is swept from a minimum value to a maximum value. This sweeping is desirably performed in discrete voltage steps that correspond to unit increments of varactor capacitance. A feedback signal from the receiver, such as an AGC signal, is monitored during this operation to note which varactor bias signal yields the maximum AGC signal. After the sweep is concluded, the apparatus applies to the varactor the bias voltage that yielded the maximum AGC signal during the sweeping operation. This bias voltage is maintained through the end of the listening interval. At the beginning of the next listening interval, the process may be repeated.
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2.发明授权Self-test device and method having an amplifier converted into an oscillator 失效具有转换成振荡器的放大器的自检装置和方法
公开(公告)号：US4864639A
公开(公告)日：1989-09-05
申请号：US101488
申请日：1987-09-28
申请人： Mark A. Dapore , Daniel A. Titus
发明人： Mark A. Dapore , Daniel A. Titus
CPC分类号： H03J7/02 , H03J3/32 , H03J7/28 , H04B1/16 , H03J1/0008
摘要： An FM receiver is self tested by connecting a positive feedback network in circuit with a wideband, front end r.f. amplifier of the receiver, so that the amplifier is converted into an oscillator. R.f. and i.f. characteristics of the receiver are determined by comparing the amplitude of an i.f. signal with a predetermined reference value while the amplifier is converted to an oscillator. Noise characteristics of the receiver are determined by comparing the amplitude of an audio frequency signal of the receiver with a predetermined value while the amplifier is converted to an oscillator and the amplifier derives an unmodulated r.f. output. Baseband characteristics of the receiver are determined by varying a reactance in the positive feedback path to impose FM on r.f. oscillations derived by the amplifier and by comparing the amplitude of the output of the audio frequency amplifier with a predetermined value. By varying the value of the reactance in the feedback loop, the oscillating frequency is swept to determine the center operating frequency and i.f. bandwidth of the r.f., amplifier.
摘要翻译： FM接收机通过将电路中的正反馈网络与宽带前端r.f.连接进行自检。 放大器，使放大器转换为振荡器。 R.f. 而如果。 通过比较i.f的振幅来确定接收机的特性。 当放大器转换为振荡器时，具有预定参考值的信号。 通过将放大器转换为振荡器并且放大器导出未调制的r.f，将接收机的音频信号的幅度与预定值进行比较来确定接收机的噪声特性。 输出。 接收机的基带特性通过改变正反馈路径中的电抗来对FM施加r.f.来确定。 并且通过将音频放大器的输出的幅度与预定值进行比较来产生振荡。 通过改变反馈回路中的电抗值，扫描振荡频率以确定中心工作频率和i.f. r.f.，放大器的带宽。
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3.发明授权Device for generating a tuning frequency set command signal of a tuner system 失效用于产生调谐器系统的调谐频率设定命令信号的装置
公开(公告)号：US4525864A
公开(公告)日：1985-06-25
申请号：US546043
申请日：1983-10-27
申请人： Yasuo Kawakami
发明人： Yasuo Kawakami
CPC分类号： H03J7/28
摘要： A device for generating a tuning frequency set command signal for a tuner system having a manual tuning mode and an automatic channel scanning mode, including a manually operable means for generating an up control signal for raising the tuning frequency and a manually operable means for generating a down control signal for lowering the tuning frequency, and timing means for measuring the duration of the up or down control signal, and control means for automatically selecting the automatic channel scanning mode when the duration of the up or down control signal becomes longer than a predetermined time period, is characterized by a reset means for resetting the timing means each time when the up or down control signal disappears, thereby alleviating the fear that the automatic channel scanning mode is erroneously selected when the means for generating up or down control signal is operated more than one time within the predetermined time period.
摘要翻译： 一种用于产生用于具有手动调谐模式和自动信道扫描模式的调谐器系统的调谐频率设置命令信号的装置，包括用于产生用于提高调谐频率的上行控制信号的手动可操作装置和用于产生调谐频率的手动操作装置 用于降低调谐频率的下降控制信号和用于测量上升或下降控制信号的持续时间的定时装置，以及用于当上升或下降控制信号的持续时间长于预定的时间时自动选择自动信道扫描模式的控制装置 时间段的特征在于，每当上升或下降控制信号消失时复位定时装置的复位装置，从而减轻了当用于产生上升或下降控制信号的装置被操作时，自动信道扫描模式被错误选择的担心 在预定时间段内多于一次。
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4.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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公开(公告)号：USRE31335E
公开(公告)日：1983-08-02
申请号：US396110
申请日：1982-07-07
申请人： Shigeo Matsuura , Eisaku Akutsu , Hiroshi Miyamoto
发明人： Shigeo Matsuura , Eisaku Akutsu , Hiroshi Miyamoto
摘要： A search tuning type channel detector system for television receivers. When AFC voltage of a tuner has attained a first predetermined voltage level, frequency sweeping direction for tuning is reversed and stopped thereby to tune the tuner at an optimum tuning frequency. Means are provided to allow the inversion as well as stoppage of the frequency sweeping only when AFC voltage has attained a second predetermined voltage level, thereby to exclude possible erroneous operation due to noise or the like spurious signal components.
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6.发明授权
公开(公告)号：US4392249A
公开(公告)日：1983-07-05
申请号：US247268
申请日：1981-03-25
申请人： Shigeo Matsuura , Ikuo Yuki
发明人： Shigeo Matsuura , Ikuo Yuki
CPC分类号： H03J7/28
摘要： There is disclosed an electronic selection apparatus comprising a surface acoustic wave comb filter, in which the local oscillator frequency of an electronic tuner is swept up to a frequency higher than a peak frequency of the surface acoustic comb filter corresponding to a desired channel number (an upward direction), and then swept toward the opposite direction (a downward direction) until a predetermined number of peaks of the comb filter is counted while checking the presence of an AFC signal, whereby an erroneous tuning operation may be prevented, provided that the signal of the desired channel is present within a predetermined range in the vicinity of the receiving frequency of the desired channel.
摘要翻译： 公开了一种电子选择装置，其包括声表面波梳状滤波器，其中将电子调谐器的本地振荡器频率扫到高于对应于期望频道号的表面声梳状滤波器的峰值频率的频率（一 向上方向），然后向相反方向（向下方向）扫掠直到梳状滤波器的预定数量的峰值被计数，同时检查AFC信号的存在，从而可以防止错误的调谐操作，只要信号 的期望信道的存在位于期望信道的接收频率附近的预定范围内。
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公开(公告)号：US4236182A
公开(公告)日：1980-11-25
申请号：US900199
申请日：1978-04-26
CPC分类号： H03J7/28 , H03J5/0263
摘要： An automatic tuning scheme for use in TV receivers includes a start/stop circuit which creates a search start signal and a search stop signal upon the receipt of a search start instruction and a detected incoming signal, respectively, a tuning voltage generator which generates a gradually varying tuning voltage under control of the search start signal and search stop signal, and a memory circuit for storing the tuning voltage from the generator when desired. The tuning voltage stored in the memory circuit is supplied to a tuner including a well known voltage-sensitive capacitance diode.
摘要翻译： 一种用于TV接收机的自动调谐方案，包括：启动/停止电路，分别在接收到搜索开始指令和检测到的输入信号时产生搜索开始信号和搜索停止信号;调谐电压发生器，逐渐产生 在搜索开始信号和搜索停止信号的控制下改变调谐电压，以及存储电路，用于在需要时存储来自发生器的调谐电压。 存储在存储器电路中的调谐电压被提供给包括公知的电压敏感电容二极管的调谐器。
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公开(公告)号：US4159487A
公开(公告)日：1979-06-26
申请号：US720878
申请日：1976-09-07
申请人： Karl Elshuber , Hans Tonn , Laszlo Gotz
发明人： Karl Elshuber , Hans Tonn , Laszlo Gotz
摘要： An automatic TV tuner circuit responsive to a tuning voltage for tuning over a desired frequency reception range. The tuning voltage is generated by a staircase voltage generator. A discriminator produces an output signal having a nominal value when the receiver is tuned to a transmitted broadcast frequency and at a discriminator output having a predetermined difference from the nominal value, a sequence control circuit halts the operation of the staircase generator and regulates the tuning voltage in a continuous manner under control of the discriminator output signal to complete the tuning process.
摘要翻译： 一种响应于调谐电压的自动TV调谐器电路，用于在期望的频率接收范围内进行调谐。 调谐电压由阶梯电压发生器产生。 当接收机被调谐到发射的广播频率并且在具有与标称值的预定差异的鉴别器输出时，鉴频器产生具有标称值的输出信号，序列控制电路停止阶梯发生器的操作并调节调谐电压 在鉴别器输出信号的控制下以连续的方式完成调谐过程。
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公开(公告)号：US4155043A
公开(公告)日：1979-05-15
申请号：US788402
申请日：1977-04-18
申请人： Yoichi Sakamoto
发明人： Yoichi Sakamoto
CPC分类号： H03J7/28
摘要： A channel selection apparatus of the scanning tuning type in which a tuning frequency is swept by a sweeping voltage to select a given tuning frequency. The sweep of the frequency is controlled for each channel by a control signal stored for each channel in the form of a number of pulses to attain exact instant tuning to a specified channel. An operating unit which compensates for temperature drift of the elements comprising the apparatus is provided to correctly compensate for temperature drift of these elements thereby attaining exact tuning.
摘要翻译： 扫描调谐型的频道选择装置，其中调谐频率被扫描电压扫描以选择给定的调谐频率。 通过以多个脉冲的形式为每个通道存储的控制信号为每个通道控制频率的扫描，以实现对指定通道的精确即时调谐。 提供了补偿包括该装置的元件的温度漂移的操作单元，以正确补偿这些元件的温度漂移，从而实现精确调谐。
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公开(公告)号：US4127822A
公开(公告)日：1978-11-28
申请号：US752427
申请日：1976-12-20
申请人： Takao Mogi , Hisao Okada
发明人： Takao Mogi , Hisao Okada
CPC分类号： H03J7/28 , H03J5/0263
摘要： A tuning system for digitally controlled electronically tuned tuner with automatic fine tuning (AFT) constantly operable to hold the tuner at a predetermined optimum frequency setting, especially a television channel. A reversible counter provides the digital signal to control the tuning of the tuner and is, itself, deliberately shifted from one setting to another by pulses from a source, such pulses being applied to the UP input terminal of the counter as the up-tuning pulses to shift the tuner frequency higher. Pulses from the same source are also used as down-tuning pulses when applied to the DOWN input terminal of the tuning pulses to a lower frequency supplied to two AFT AND circuits. One output logic up-tuning instruction signal E.sub.U of the AFT circuit enables the up-tuning AFT AND circuit only in a certain sub-range below the desired frequency. The other output logic down-tuning instruction signal E.sub.D of the AFT circuit enables the other AFT AND circuit only in a certain sub-range above the desired frequency. Consequently, deliberate application of up-or-down-tuning pulses to the UP or DOWN terminals changes the count as desired, being only partially counteracted by the lower frequency, AFT-controlled pulses to the opposite counter terminal.
摘要翻译： 一种用于数字控制的电子调谐调谐器的调谐系统，具有自动微调（AFT），其经常可操作地将调谐器保持在预定的最佳频率设置，特别是电视频道。 可逆计数器提供数字信号以控制调谐器的调谐，并且本身通过来自源的脉冲从一个设置故意地移位到另一个设置，这样的脉冲被施加到计数器的UP输入端作为上调脉冲 使调谐器频率更高。 当将调谐脉冲的DOWN输入端施加到提供给两个AFT AND电路的较低频率时，来自相同源的脉冲也用作下调脉冲。 AFT电路的一个输出逻辑上调指令信号EU只能在低于期望频率的某个子范围内进行上调AFT AND电路。 AFT电路的另一个输出逻辑降频指令信号ED只能在所需频率之上的某个子范围内使其他AFT AND电路。 因此，向UP或DOWN端子故意施加上升或下降调谐脉冲根据需要改变计数，仅通过较低频率AFT控制的脉冲部分抵消到相对的计数器端子。
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