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    • 1. 发明授权
    • Apparatus for multiplex recording and reproduction of audio and video
signals
    • 音频和视频信号的复用记录和再现装置
    • US4691246A
    • 1987-09-01
    • US677243
    • 1984-12-03
    • Kuniaki MiuraYoshinori OkadaIsao FukushimaSusumu Otsuka
    • Kuniaki MiuraYoshinori OkadaIsao FukushimaSusumu Otsuka
    • G11B20/06H04N9/802H04N9/83H04N9/835H04N5/782
    • H04N9/802H04N9/8355
    • A recording circuit for a video tape recorder which records superposedly a frequency-modulated audio signal with a frequency-modulated luminance signal and a carrier color signal converted to a low frequency band records a carrier wave signal which is frequency-modulated by the luminance signal at a substantially constant recording current within the frequency range corresponding to a range from the sync signal leading edge to the white peak. In an ordinary recording circuit, the extent of erasure of the recorded audio signal varies with the content of the frequency-modulated luminance signal when the luminance signal is recorded on the recording track of the frequency-modulated audio signal, because recording is made by increasing a recording current for a signal having an instantaneous frequency which is low. Therefore, the recorded signal which is frequency-modulated by the audio signal is amplitude-modulated by the luminance signal, and interference with the audio signal due to the change of S/N corresponding to the change of the amplitude occurs. In the recording circuit of the present invention, however, no interference is applied to the audio signal because the extent of erasure of the recorded audio signal by the luminance signal remains substantially constant irrespective of the content of the luminance signal.
    • 一种用于记录频率调制的音频信号与频率调制的亮度信号和转换为低频带的载波颜色信号的记录电路,记录由亮度信号频率调制的载波信号 在对应于从同步信号前沿到白色峰值的范围内的频率范围内的基本恒定的记录电流。 在通常的记录电路中,当记录在调频音频信号的记录轨道上时,记录的音频信号的擦除程度随着调频亮度信号的内容而变化,因为通过增加记录 用于瞬时频率低的信号的记录电流。 因此,由音频信号进行了频率调制的记录信号由亮度信号进行幅度调制,并且由于与幅度变化相对应的S / N的变化引起的与音频信号的干扰发生。 然而,在本发明的记录电路中,由于亮度信号的记录音频信号的擦除程度与亮度信号的内容无关,所以不会对音频信号施加干扰。
    • 2. 发明授权
    • Integrated filter circuit with variable frequency characteristics
    • 具有变频特性的集成滤波电路
    • US4667120A
    • 1987-05-19
    • US721867
    • 1985-04-10
    • Yoshinori OkadaIsao FukushimaKuniaki MiuraKenji Kano
    • Yoshinori OkadaIsao FukushimaKuniaki MiuraKenji Kano
    • H03H7/01H01L27/00H03H7/06H03H11/04H03K5/00H03B1/00
    • H03H11/1291
    • A filter integrated circuit having a reference level generator circuit for attenuating its input signal and generating a reference level signal, a pseudofilter circuit including resistors and a variable capacitor as filter elements, and an error amplifier unit for comparing the level of the output signal of the reference level generator circuit with the level of the output signal of the pseudofilter circuit and for generating an automatic adjustment control signal in accordance with the level difference between the output signals. The automatic adjustment control signal is supplied to the pseudofilter circuit to change the capacitance value of the variable capacitor in the pseudofilter circuit so that the output signal level of the pseudofilter circuit may become equal to the level of the reference signal. The automatic adjustment control signal is also supplied to at least one filter circuit to change the capacitance of a variable capacitor included therein. As a result, the deviation in the filter characteristics caused by deviations in the resistance of a resistor and in the capacitance of the capacitor is corrected.
    • 一种滤波器集成电路,具有用于衰减其输入信号并产生参考电平信号的参考电平发生器电路,包括电阻器的可变电容器和作为滤波器元件的可变电容器的误滤电路,以及误差放大器单元,用于将输出信号的输出信号 参考电平发生器电路,其具有伪滤波电路的输出信号的电平,并且用于根据输出信号之间的电平差产生自动调节控制信号。 自动调节控制信号被提供给伪滤光器电路,以改变伪滤光器电路中的可变电容器的电容值,使得可将假模糊电路的输出信号电平变为等于参考信号的电平。 自动调整控制信号也被提供给至少一个滤波器电路以改变其中包括的可变电容器的电容。 结果,校正了由电阻器的电阻的偏差和电容器的电容引起的滤波器特性的偏差。
    • 5. 发明授权
    • Multiplex magnetic recording and reproduction system
    • 多重磁记录和再现系统
    • US4591924A
    • 1986-05-27
    • US575665
    • 1984-01-31
    • Kuniaki MiuraYoshinori OkadaIsao FukushimaTeizo Tamura
    • Kuniaki MiuraYoshinori OkadaIsao FukushimaTeizo Tamura
    • G11B5/02G11B5/008G11B5/53G11B15/12G11B15/18G11B15/467G11B20/22H04N5/7826H04N9/79H04N9/802H04N9/835H04N9/80
    • H04N9/802G11B15/125G11B15/1875G11B20/22G11B5/00878G11B5/534H04N5/78263H04N9/7921H04N9/8355G11B15/4673
    • In a video tape recorder of the helical scan type, a pair of rotary magnetic heads for the audio signal are provided in addition to the rotary video heads so that the audio signal is recorded on the same slant track as of the video signal on a multiplex basis. The audio head pair is provided with an azimuth angle with opposite polarities from each other and different in value from that of the video head pair. The system has a first operation mode of the standard tape speed and a second operation mode in which the tape is fed at a speed, for example, 1/3 the standard tape speed. The audio and video head pairs are disposed on lines intersecting at right angles with an offset of T.sub.1 /2+T.sub.1 provided in the axial direction of rotation between the two magnetic head pairs, where T.sub.1 is the track pitch of the recording track formed on the tape in the second operation mode. The system produces overlapping tracks for the audio and video signals on the magnetic tape. In the first operation mode, the recording track is formed by a combination of magnetic heads providing an increased difference of azimuth angles between the audio and video heads, while in the second operation mode, the track is formed by a combination of magnetic heads providing a decreased difference of azimuth angles between the audio and video heads.
    • 在螺旋扫描类型的磁带录像机中,除了旋转视频磁头之外,还提供一对音频信号的旋转磁头,使得音频信号被记录在与多路复用器上的视频信号相同的倾斜磁道上 基础。 音频头对被提供有彼此极性相反的方位角,其值与视频头对的极值相差。 该系统具有标准带速度的第一操作模式和第二操作模式,其中以例如1/3标准带速度的速度馈送带。 音频和视频头对被布置在与两个磁头对之间的旋转轴线方向上设置的T1 / 2 + T1偏移的直角相交的线上,其中T1是形成在第二磁头对上的记录轨道的轨道间距 磁带在第二个操作模式。 该系统为磁带上的音频和视频信号产生重叠的轨道。 在第一操作模式中,通过磁头的组合形成记录磁道,该磁头提供音频和视频磁头之间的方位角的增加的差异,而在第二操作模式中,磁道由提供 降低音频和视频头之间的方位角差。
    • 8. 发明授权
    • Integrated circuit with a phase-locked loop
    • 具有锁相环的集成电路
    • US4667168A
    • 1987-05-19
    • US839535
    • 1986-03-14
    • Makoto ShiomiKuniaki MiuraIsao FukushimaEiji MoroShigeaki Kanenari
    • Makoto ShiomiKuniaki MiuraIsao FukushimaEiji MoroShigeaki Kanenari
    • H03L7/08H03H11/04H03L7/06H03L7/00
    • H03L7/0805H03L7/06
    • The IC chip consists of electronic circuits wherein voltage control oscillator whose oscillation frequency is dependent on the product of the resistance value of a resistor element and the electrostatic capacity of a capacitor element is provided; said capacitor element consists of the first variable capacitor; said voltage control oscillator comprises said capacitor consisting of said first variable capacitor; said first variable capacitor is controlled by the output obtained by detecting the output signal of said voltage control oscillator by its phase, using the predetermined reference signal, whereby the oscillation frequency of said voltage control oscillator can be made to agree with the frequency of said reference signal. Furthermore, the characteristic of said electronic circuit is dependent on a second resistor element and a second variable capacitor element; said second variable capacitor is controlled by the output obtained by the phase detection so that dispersions of the resistance value of the resistor element and the electrostatic capacity of the capacitor element in said electronic circuit are absorbed automatically.
    • 该IC芯片由电子电路构成,其中电压控制振荡器的振荡频率取决于电阻元件的电阻值与电容器元件的静电电容的乘积; 所述电容器元件由第一可变电容器组成; 所述电压控制振荡器包括由所述第一可变电容器组成的所述电容器; 所述第一可变电容器由通过使用所述预定参考信号检测所述压控振荡器的输出信号而得到的输出来控制,由此可以使所述压控振荡器的振荡频率与所述基准的频率一致 信号。 此外,所述电子电路的特性取决于第二电阻元件和第二可变电容器元件; 所述第二可变电容器由通过相位检测获得的输出控制,使得电阻元件的电阻值和所述电子电路中的电容器元件的静电电容的分散被自动吸收。