公开(公告)号：US3968519A

公开(公告)日：1976-07-06

申请号：US582286

申请日：1975-05-30

申请人： Juho Yoneya ,  Isamu Inagaki

发明人： Juho Yoneya ,  Isamu Inagaki

IPC分类号： G11B5/027 ,  G11B23/00 ,  G11B15/02 ,  G11B5/02

CPC分类号： G11B23/0007

摘要： An amplifier, for example, of a tape recording and reproducing apparatus, has a first smoothing power circuit for supplying DC power to operate the amplifying circuit when connected to an AC power source, and a second smoothing power circuit also adapted for connection to the AC power source for supplying DC power to operate other elements of the apparatus, such as, an oscillator for the bias signal to be applied to the recording head and/or an alarm for indicating the exhaustion of the tape, and also to energize a relay coil or the like by which change-over switches are actuated to their position for the recording mode of operation of the apparatus, with the first and second smoothing power circuits respectively having relatively large and small discharging time constants when disconnected from the AC power source so that, if the smoothing power circuits are disconnected from the AC power source while the apparatus is in its recording mode, the change-over switches may be returned to their positions for the reproducing or playback mode of the apparatus while the amplifying circuit is still operative to produce howling. Such howling is prevented by providing an amplifier, as aforesaid, with a holding circuit which detects the disconnection of the smoothing power circuits from the AC power source and, in response thereto, is effective to hold the change-over switches in their recording mode positions until the DC voltage applied to the amplifying circuit has declined sufficiently to render the latter inoperative.

摘要翻译： 例如，磁带记录和再现装置的放大器具有第一平滑电源电路，用于在连接到交流电源时提供直流电力以操作放大电路;以及第二平滑电源电路，其还适于连接到交流电源 用于提供直流电力以操作装置的其它元件的电源，例如用于施加到记录头的偏置信号的振荡器和/或用于指示磁带的耗尽的报警器，以及用于给继电器线圈 等等，通过其转换开关被激活到其用于记录操作装置的位置，当与AC电源断开时，第一和第二平滑功率电路分别具有相对较大和较小的放电时间常数，使得 如果在设备处于其记录模式时平滑电源电路与AC电源断开连接，则转换开关可以返回到 它们在放大电路仍然可操作地产生啸叫的情况下用于装置的再现或重放模式的位置。 通过如上所述提供一种放大器来防止这种啸叫，该保持电路检测平滑功率电路与AC电源的断开，并且响应于此，有效地将转换开关保持在其记录模式位置 直到施加到放大电路的DC电压已经充分下降，使得后者不起作用。

公开(公告)号：US4896354A

公开(公告)日：1990-01-23

申请号：US786802

申请日：1985-10-11

申请人： Isamu Inagaki ,  Haruo Aoki

发明人： Isamu Inagaki ,  Haruo Aoki

IPC分类号： H04H20/59 ,  H04H20/76 ,  H04H60/15 ,  H04N7/16

CPC分类号： H04H60/15 ,  H04H20/59 ,  H04H20/76 ,  H04H60/16 ,  H04N21/42204 ,  H04N21/4221 ,  H04N21/4318 ,  H04N21/4542 ,  H04N21/4753 ,  H04N21/4755 ,  H04N21/482 ,  H04N5/445 ,  H04N7/162

摘要： An image reception system is disclosed, which includes a tuner for selecting one of broadcast channels of CATV, a video detector connected to the tuner for deriving output signals having video signals and command data of the selected channel, a data fetch circuit for extracting the command data and character data out of the output signals derived from the video detector, a display controller for controling video outputs to be displayed on a display screen, and a key pad for supplying the control command to the display controller. In this case, the display controller includes a character generator for generating character signals to be displayed on the display and masking circuit for superimposing masking signals on the video signal on request.

摘要翻译： 公开了一种图像接收系统，其包括用于选择CATV的广播频道之一的调谐器，连接到调谐器的视频检测器，用于导出具有视频信号的输出信号和所选频道的命令数据;数据提取电路，用于提取命令 从视频检测器导出的输出信号中的数据和字符数据，用于控制要在显示屏幕上显示的视频输出的显示控制器，以及用于向显示控制器提供控制命令的键盘。 在这种情况下，显示控制器包括字符发生器，用于产生要在显示器上显示的字符信号，并且屏蔽电路用于根据请求将掩蔽信号叠加在视频信号上。