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37 条记录 (耗时 0.011 秒)

    Multichannel disc demodulation circuit
    31.
    发明授权
    Multichannel disc demodulation circuit 失效
    多通道光盘解调电路

    公开(公告)号：US3854098A

    公开(公告)日：1974-12-10

    申请号：US32602773

    申请日：1973-01-23

    申请人： VICTOR COMPANY OF JAPAN

    发明人： TAKAHASHI N ,  SATO M ,  IWASAKI Y ,  NISIKAWA K

    IPC分类号： H04S3/00 ,  H03D3/18 ,  G11B3/04

    CPC分类号： H04S3/006

    摘要： A demodulation system employs a phase locked loop. A multichannel disc demodulation circuit has a phase comparator of a differential amplifier type having an input circuit the input AC impedance of which is set at a relatively high value. The DC impedance of a base-bias circuit of input transistors of the phase comparator is set at a relatively low value. This demodulation circuit is capable of accomplishing demodulation without the occurrence of a phase difference when an amplitude variation occurs in the envelope of an angle-modulated wave introduced as input into the phase comparator.

    摘要翻译： 解调系统采用锁相环。 多通道光盘解调电路具有差分放大器类型的相位比较器，该相位比较器具有其输入AC阻抗被设置为相对高的值的输入电路。 相位比较器的输入晶体管的基极偏置电路的直流阻抗被设定为相对较低的值。 当在作为相位比较器的输入引入的角度调制波的包络中发生振幅变化时，该解调电路能够进行解调而不发生相位差。

    Electromagnetic sound pickup for the reproduction of quadrophonic sound recordings and the like
    32.
    发明授权
    Electromagnetic sound pickup for the reproduction of quadrophonic sound recordings and the like 失效
    用于生成四声录音和类似声音的电磁声音拾音器

    公开(公告)号：US3851117A

    公开(公告)日：1974-11-26

    申请号：US35218973

    申请日：1973-04-18

    申请人： ELECTROACUSTIC GMBH

    发明人： KUHN H

    IPC分类号： H04R11/08 ,  G11B3/04 ,  H04R11/12

    CPC分类号： H04R11/12

    摘要： An electromagnetic sound pickup for use in the production of quadrophonic sound recordings and the like includes at least two scanning devices each suited for different frequency ranges. Each scanning device is arranged on a common mounting means which is rotatably supported about its longitudinal axis in a sound pickup housing in such a manner that the pole piece ends associated with each scanning device can selectively be brought into contact with pole piece parts which are fixed with respect to the housing by rotating the mounting means about its longitudinal axis.

    摘要翻译： 用于制造四声录音等的电磁拾音器包括至少两个适合于不同频率范围的扫描装置。 每个扫描装置被布置在共同的安装装置上，该安装装置以这样的方式围绕其纵向轴线可旋转地支撑在拾音器壳体中，使得与每个扫描装置相关联的极靴端部可以选择性地与固定的极靴部件接触 相对于壳体，通过围绕其纵向轴线旋转安装装置。

    Phonograph pickup head assembly
    33.
    发明授权
    Phonograph pickup head assembly 失效
    PHONOGRAPH PICKUP HEAD ASSEMBLY

    公开(公告)号：US3656762A

    公开(公告)日：1972-04-18

    申请号：US3656762D

    申请日：1970-01-07

    申请人： REVERBASONICS INC

    发明人： JOHNSON RICHARD D

    IPC分类号： G11B3/04 ,  G11B3/02

    CPC分类号： G11B3/04

    摘要： A phonograph pickup head assembly is described for producing reverberative sound signals from a grooved phonograph disc. The head assembly includes a pickup head and forward and rear cartridge supports. The rear cartridge support is secured rigidly to the pickup head and the forward cartridge support is secured such that it is movable laterally and vertically with respect thereto. A mounting clamp is provided at the rearward end of the pickup head for attaching the pickup head to a tone arm in a manner in which the relative angular position of the pickup head with respect to the tone arm is adjustable.

    摘要翻译： 描述了用于从槽式留声机盘产生混响声信号的留声机拾音头组件。 头组件包括拾取头和前和后盒支架。 后盒支撑件刚性固定到拾取头，并且前筒支撑件被固定，使得其相对于其可以横向和垂直地移动。 在拾取头的后端设有安装夹，用于以拾音头相对于音臂的相对角位置可调节的方式将拾音头附接到音臂。