公开(公告)号：US5548811A

公开(公告)日：1996-08-20

申请号：US336205

申请日：1994-11-03

申请人： Yoshiaki Kumagai ,  Eiji Itaya ,  Yoichi Endo

发明人： Yoshiaki Kumagai ,  Eiji Itaya ,  Yoichi Endo

IPC分类号： H03J7/04 ,  H03J7/06 ,  H04B1/18

CPC分类号： H03J7/047 ,  H03J7/065

摘要： An automatic frequency control (AFC) circuit receives input signals and generates converted signals by mixing the input signals with a local oscillation signal. An extraction circuit extracts a pilot signal, if present, from the input signals and provides the pilot signal to a switch. A frequency divider divides a frequency of the local oscillation signal output from a voltage control oscillator, and provides the frequency-divided local oscillation signal to the switch. The output of the switch is compared with a reference frequency in a phase comparator which generates a comparison result which controls the voltage controlled oscillator. If the pilot signal is not present, the switch selects the frequency-divided oscillation signal, to construct a phase-locked loop to stabilize the frequency of the local oscillation signal. Alternatively, an AFC circuit includes a frequency divider for selectively dividing a frequency of a pilot signal included in the converted signal. Various frequencies of the pilot signal can be received by altering a division number in the frequency divider.

摘要翻译： 自动频率控制（AFC）电路接收输入信号并通过将输入信号与本地振荡信号混合来产生转换的信号。 提取电路从输入信号中提取导频信号（如果有的话），并向导频提供导频信号。 分频器分压从压控振荡器输出的本地振荡信号的频率，并向开关提供分频本机振荡信号。 将开关的输出与相位比较器中的参考频率进行比较，该相位比较器产生控制压控振荡器的比较结果。 如果导频信号不存在，则开关选择分频振荡信号，构成锁相环，以稳定本振信号的频率。 或者，AFC电路包括用于选择性地分频转换信号中包括的导频信号的频率的分频器。 可以通过改变分频器中的分频数来接收导频信号的各种频率。

公开(公告)号：US4755978A

公开(公告)日：1988-07-05

申请号：US13232

申请日：1987-02-10

申请人： Kazuyuki Takizawa ,  Hiroyuki Urushibata ,  Yoshiaki Kumagai

发明人： Kazuyuki Takizawa ,  Hiroyuki Urushibata ,  Yoshiaki Kumagai

IPC分类号： G11B17/08 ,  G11B17/22 ,  G11B17/24 ,  G11B25/04 ,  G11B17/26

CPC分类号： G11B17/226 ,  G11B25/043

摘要： A disc player has a slide table mounted to slide horizontally into and out of a casing, a disc tray supported rotatably on the slide table and having a plurality of recessed disc storage areas arranged about its center of rotation to store a plurality of discs on its top surface a drive mechanism for rotating the disc tray and halting it at predetermined positions, an optical pickup and a turntable disposed within the casing at a play position for reproducing the disc placed at the play position by the disc tray, and a loading mechanism for displacing the slide table and controlling rotation of the disc tray so that, when the slide table is displaced from a first position outside of the casing to a second position within the casing, the foremost disc storage area of the disc tray in the first position is rotated to the play position in the second position. Further, the optical pickup and the turntable are moved upward by the loading mechanism with respect to the disc tray when the slide table is moved to the second position so that the disc set at the play position is held between the turntable and a disc presser while being kept afloat from the disc tray.

摘要翻译： 光盘播放器具有安装成水平地插入和移出壳体的滑动台，可旋转地支撑在滑动台上的盘托盘，并且具有围绕其旋转中心布置的多个凹陷盘存储区域，以在其上存储多个盘 上表面是用于使盘托盘旋转并在预定位置停止的驱动机构，设置在外壳内的光学拾取器和转台，用于再现盘托盘放置在播放位置处的盘的播放位置;以及装载机构， 移动滑动台并控制盘托盘的旋转，使得当滑动台从壳体外部的第一位置移位到壳体内的第二位置时，盘托盘的第一位置的最前面的盘存放区域是 在第二位置旋转到播放位置。 此外，当滑动台移动到第二位置时，光学拾取器和转台由装载机构相对于盘托盘向上移动，使得设置在播放位置的盘被保持在转盘和盘形压片之间，同时 从盘托盘中保持浮动。