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6 条记录 (耗时 0.009 秒)

    Scrambling system for audio frequency signals
    1.
    发明授权
    Scrambling system for audio frequency signals 失效
    音频信号加扰系统

    公开(公告)号：US4600941A

    公开(公告)日：1986-07-15

    申请号：US560957

    申请日：1983-12-13

    申请人： Akira Sakamoto ,  Toshihiko Waku ,  Takeshi Fukami ,  Masakatsu Toyoshima ,  Michimasa Komatsubara

    发明人： Akira Sakamoto ,  Toshihiko Waku ,  Takeshi Fukami ,  Masakatsu Toyoshima ,  Michimasa Komatsubara

    IPC分类号： H04K1/06 ,  H04N7/167

    CPC分类号： H04K1/06

    摘要： A scrambling system for an audio frequency signal in which an audio signal is divided into blocks, each block being formed of a plurality of frames, the plurality of frames are rearranged on a timebase in a predetermined order at every block so as to be encoded and the encoded signal is re-arranged on the timebase in an original order so as to be decoded, in which there are provided a first signal processing circuit for inserting a redundant portion into a portion between adjoining frames and timebase-compressing the frames in response to the redundant portions upon encoding, a control signal generating circuit for inserting a control signal other than an audio information into the redundant portions, a control signal detecting circuit for detecting the control signal upon decoding and a second signal processing circuit for removing the redundant portions in synchronism with the detected control signal and timebase-expanding the frames in response to the redundant portions. Therefore, even when the audio signal is transmitted through a system in a transmission path having a timebase fluctuation such as a transmission path of a VTR (video tape recorder) and the like the frequency band region of which is restricted, the signal waveform is not distorted and a noise is not mixed therein so that the scrambling communication having high quality and high reliability can be presented.

    摘要翻译： 一种用于音频信号的音频信号的加扰系统，其中音频信号被分成多个块，每个块由多个帧形成，所述多个帧在每个块上以预定顺序在时基上重新排列，以被编码; 编码信号以原始顺序重新排列在时基上以被解码，其中提供了第一信号处理电路，用于将冗余部分插入相邻帧之间的部分，并响应于时基而压缩帧 编码后的冗余部分，用于将除音频信息之外的控制信号插入到冗余部分中的控制信号生成电路，用于在解码时检测控制信号的控制信号检测电路和用于去除冗余部分中的冗余部分的第二信号处理电路 与检测到的控制信号同步并响应于冗余部分对时基进行扩展。 因此，即使音频信号通过具有时频波动的传输路径的系统发送，例如VTR（录像机）的传输路径等，其频带区域被限制，信号波形也不会 失真并且不混合噪声，从而可以呈现具有高质量和高可靠性的扰频通信。

    Temperature compensated crystal oscillator
    2.
    发明授权
    Temperature compensated crystal oscillator 失效
    温度补偿晶体振荡器

    公开(公告)号：US4096452A

    公开(公告)日：1978-06-20

    申请号：US793128

    申请日：1977-05-02

    申请人： Toshihiko Waku ,  Hiroshi Shinohara

    发明人： Toshihiko Waku ,  Hiroshi Shinohara

    IPC分类号： H03B5/32 ,  H03B5/36 ,  H03L1/02

    CPC分类号： H03B5/368 ,  H03L1/023

    摘要： A temperature-compensated crystal oscillator for correcting frequency variations caused by temperature changes by means of a differential amplifier which detects an unbalanced voltage in a bridge circuit including a temperature sensitive element for controlling a capacitance of a variable capacitor. The oscillator includes a circuit element having a temperature characteristic responsive to a temperature characteristic of the variable capacitor. The aforesaid circuit element is positioned in a current sink path of the differential amplifier.

    摘要翻译： 一种用于校正由温度变化引起的频率变化的温度补偿晶体振荡器，该差分放大器检测包括用于控制可变电容器的电容的温度敏感元件的桥式电路中的不平衡电压。 振荡器包括具有响应于可变电容器的温度特性的温度特性的电路元件。 上述电路元件位于差分放大器的电流吸收通路中。

    Variable band pass filter circuit
    3.
    发明授权
    Variable band pass filter circuit 失效
    可变带通滤波电路

    公开(公告)号：US3956719A

    公开(公告)日：1976-05-11

    申请号：US523482

    申请日：1974-11-13

    申请人： Toshihiko Waku ,  Hiroshi Takeuchi

    发明人： Toshihiko Waku ,  Hiroshi Takeuchi

    IPC分类号： H04B1/16 ,  H03G5/14 ,  H03H9/54 ,  H03H9/56 ,  H03H9/58 ,  H03H9/60 ,  H03H9/26 ,  H03H9/32

    CPC分类号： H03H9/545 ,  H03G5/14 ,  H03H9/581

    摘要： A variable band pass filter circuit utilizing first and second ceramic filters including a pair of passive circuits that can be selectively connected between the ceramic filters and wherein the first passive circuit comprises a first capacitor connected between the output of the first ceramic filter and the input of the second ceramic filter and the second passive circuit includes a second capacitor connectable between the output of the first ceramic filter and the input of the second ceramic filter and an inductor connected between the input of the second ceramic filter and a reference point.

    摘要翻译： 一种利用第一和第二陶瓷滤波器的可变带通滤波器电路，包括可以选择性地连接在陶瓷滤波器之间的一对无源电路，其中第一无源电路包括连接在第一陶瓷滤波器的输出端和第 第二陶瓷滤波器和第二无源电路包括可连接在第一陶瓷滤波器的输出端和第二陶瓷滤波器的输入端之间的第二电容器和连接在第二陶瓷滤波器的输入端和参考点之间的电感器。

    Temperature compensated variable frequency crystal oscillator
    5.
    发明授权
    Temperature compensated variable frequency crystal oscillator 失效
    温度补偿变频晶体振荡器

    公开(公告)号：US3995233A

    公开(公告)日：1976-11-30

    申请号：US527693

    申请日：1974-11-27

    申请人： Toshihiko Waku

    发明人： Toshihiko Waku

    IPC分类号： H03B5/32 ,  H03B5/04 ,  H03B5/36 ,  H03C3/22

    CPC分类号： H03B5/368 ,  H03C3/222 ,  H03B2200/004 ,  H03B5/04 ,  H03B5/362 ,  H03C2200/0091

    摘要： A temperature compensated variable oscillator formed of at least two capacitors and a resonator, or vibrator, made of lithium tantalate, in which an inductance element whose inductance value can be varied is connected in series to the vibrator; the capacitance of one of said capacitors is changed linearly in response to temperature variations, and the capacitance of the other capacitor is changed in response to temperature variations, in accordance with a second order relationship between capacitance and temperature, the graphical representation of such relationship being a second degree curve opening upward.

    摘要翻译： 由至少两个电容器构成的温度补偿可变振荡器和由钽酸锂制成的谐振器或振子，其中电感值可以变化的电感元件与振动器串联连接; 所述电容器之一的电容响应于温度变化线性地改变，并且另一个电容器的电容根据电容和温度之间的二阶关系来响应于温度变化而改变，这种关系的图形表示是 第二度曲线向上打开。