公开(公告)号：US4305157A

公开(公告)日：1981-12-08

申请号：US101138

申请日：1979-12-07

申请人： Takao Mogi

发明人： Takao Mogi

IPC分类号： H03J7/28 ,  H03J5/00 ,  H03J5/02 ,  H03J7/06 ,  H04B1/26 ,  H04N5/44 ,  H04B1/32

CPC分类号： H03J7/065 ,  H03J5/0281

摘要： A tuning apparatus includes an RF amplifier for receiving a video signal corresponding to a selected channel, a voltage controlled oscillator for producing a local oscillation signal, a mixing circuit for converting the received video signal to an intermediate frequency signal with the local oscillation signal, a programmable frequency divider selectively receiving the local oscillation signal and the intermediate frequency signal and producing a frequency-divided output signal, a phase comparator for comparing the frequency-divided output signal with a reference oscillation signal so as to control the voltage controlled oscillator, a switching circuit for selectively supplying the local oscillation signal and the intermediate frequency signal to the programmable frequency divider, and a control circuit for selectively enabling the switching circuit to supply the local oscillation signal to the programmable frequency divider during a predetermined time after the channel is selected and to supply the intermediate frequency signal after the predetermined time, the control circuit also controlling the RF amplifier and the voltage controlled oscillator in accordance with a frequency band containing the selected channel.

摘要翻译： 调谐装置包括用于接收对应于所选择的声道的视频信号的RF放大器，用于产生本地振荡信号的压控振荡器，用于将接收到的视频信号转换成具有本地振荡信号的中频信号的混合电路， 可编程分频器选择性地接收本地振荡信号和中频信号并产生分频输出信号;相位比较器，用于将分频输出信号与参考振荡信号进行比较，以便控制压控振荡器;开关 电路，用于选择性地将本地振荡信号和中频信号提供给可编程分频器;以及控制电路，用于在选择通道之后的预定时间期间选择性地使切换电路将本地振荡信号提供给可编程分频器; 在预定时间之后提供中频信号，控制电路还根据包含所选频道的频带来控制RF放大器和压控振荡器。

公开(公告)号：US4186345A

公开(公告)日：1980-01-29

申请号：US846445

申请日：1977-10-28

申请人： Kouji Marita ,  Takao Mogi

发明人： Kouji Marita ,  Takao Mogi

IPC分类号： G08C19/22 ,  H03J9/00 ,  H03J9/04 ,  H04N5/00 ,  H04Q9/14 ,  H01R13/50

CPC分类号： H03J9/04 ,  G08C19/22

摘要： A remote control system for selectively controlling a plurality of functions includes a receiver having a decoding circuit for decoding a command signal having alternating mark periods and space periods, the decoding circuit being responsive to the length of the space period for selecting the function to be controlled.

摘要翻译： 用于选择性地控制多个功能的遥控系统包括具有解码电路的接收机，用于解码具有交替标记周期和空间周期的命令信号，所述解码电路响应于用于选择要控制的功能的空间周期长度 。

公开(公告)号：US4127818A

公开(公告)日：1978-11-28

申请号：US740753

申请日：1976-11-10

申请人： Takao Mogi

发明人： Takao Mogi

IPC分类号： H03J5/02 ,  H03J7/02 ,  H03J7/06 ,  H04N5/44 ,  H04B1/16

CPC分类号： H03J5/0263 ,  H03J7/023

摘要： A method of and apparatus for tuning an electronic tuner of the type having a voltage-controlled tuning element to which a selected control voltage is applied, thereby tuning the electronic tuner to a corresponding frequency, the tuner additionally including an automatic fine tuning circuit which is operable even when a control voltage first is applied to the voltage-controlled tuning element. When the control voltage first is applied, generally it experiences a gradual increase in magnitude until its predetermined control voltage level is attained. The automatic fine tuning circuit may pull in a frequency corresponding to the instantaneous level of the control voltage during the gradual increase in magnitude thereof. To avoid tuning the electronic tuner to this pulled-in frequency, the selected control voltage is re-applied to the tuning element at a predetermined time subsequent to the initial application of such control voltage.In a preferred embodiment, the electronic tuner is a programmable tuner provided with a storage device wherein representations, such as digital representations, of desired frequencies are stored. The tuner is tuned to one of these frequencies by reading out a selected representation, converting the representation to a corresponding control voltage and then applying this voltage to the voltage-controlled tuning element. The automatic fine tuning operation serves to modify the read-out representation, and thus the converted control voltage, to correspond to a pulled-in frequency. The selected control voltage is re-applied to the tuning element by reading out once again the selected representation from the storage device.

摘要翻译： 一种用于调谐具有施加了所选择的控制电压的压控调谐元件类型的电子调谐器的方法和装置，从而将电子调谐器调谐到相应的频率，该调谐器还包括一个自动微调电路 即使当控制电压首先施加到压控调谐元件时也是可操作的。 当施加控制电压时，通常它经历幅度的逐渐增加，直到达到其预定的控制电压电平。 自动微调电路可以在其逐渐增加的幅度期间拉动对应于控制电压的瞬时电平的频率。 为了避免将电子调谐器调谐到该拉入频率，在初始施加这种控制电压之后的预定时间，所选择的控制电压被重新施加到调谐元件。

公开(公告)号：US4058772A

公开(公告)日：1977-11-15

申请号：US717477

申请日：1976-08-25

申请人： Takao Mogi ,  Akira Taki ,  Hiroshi Yamazaki

发明人： Takao Mogi ,  Akira Taki ,  Hiroshi Yamazaki

IPC分类号： H03J7/18 ,  H03J3/18 ,  H03J5/02 ,  H03J7/20 ,  H03M1/00 ,  H03M1/82 ,  H04N5/44 ,  H04B1/06

CPC分类号： H03J5/0263 ,  H03J3/185 ,  H03J5/0254 ,  H03M1/827

摘要： A method of and apparatus for converting a plural-bit digital signal to a pulse width modulated signal which, thereafter, can be filtered to derive an analog signal level corresponding to the value of the digital signal. A periodic timing signal is produced and each period thereof is divided into predetermined sections. The value of the digital signal is divided by a factor equal to the number of predetermined sections, and the divided digital signal is converted into a corresponding pulse width modulated signal during each of the timing sections. The pulse width of the pulse width modulated signal in selected ones of the timing sections is selectively increased by a predetermined amount in the event that the divided digital value is not an integral number. In particular, the number of such timimg sections wherein the pulse width of the pulse width modulated signal is increased is equal to the remainder obtained after the value of the digital signal is divided.

摘要翻译： 一种用于将多位数字信号转换为脉冲宽度调制信号的方法和装置，此后可以滤波以产生与数字信号的值对应的模拟信号电平。 产生周期性定时信号，并将其周期分成预定部分。 将数字信号的值除以等于预定部分的数量的因子，并且在每个定时部分期间将划分的数字信号转换成相应的脉宽调制信号。 在分割数字值不是整数的情况下，选定的定时部分中的脉冲宽度调制信号的脉冲宽度被选择性地增加预定量。 特别地，其中脉宽调制信号的脉冲宽度增加的这种定时部分的数量等于在数字信号的值被分割之后获得的余数。