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    • 5. 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。
    • 7. 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。
    • 9. 发明授权
    • Signal discriminating device for VTR having expanded dynamic range
    • 用于具有扩展动态范围的录像机的信号识别装置
    • US5075803A
    • 1991-12-24
    • US333901
    • 1989-04-06
    • Eiji MoroHitoshi AkamineHiroyuki ToriiKuniaki Miura
    • Eiji MoroHitoshi AkamineHiroyuki ToriiKuniaki Miura
    • G11B5/027G11B20/02G11B20/06H04N5/93H04N9/79H04N9/83
    • H04N5/93H04N9/7925H04N9/832H04N9/833
    • A magnetic recording and reproducing apparatus having a first recording mode and a second recording mode in which a luminance signal of a video signal is converted into FM luminance signal related to a first carrier frequency and to a second carrier frequency so as to be recorded on a magnetic tape includes a discriminating device or discriminating a recording mode in which an FM luminance signal reproduced from a magnetic tape so as to be supplied to a playback circuit has been recorded. The signal discriminating device includes an automatic gain control (AGC) circuit for absorbing a dispersion of the reproduced signal, a discrimiating circuit having a first band-pass filter and a second band-pass filter for processing an output from the AGC circuit so as to discriminate the first and second modes, a detecting circuut to which the reproduced signal is supplied in a parallel fashion with respect to the AGC circuit such that an amplitude of the signal is detected and is then compared with a predetermined value so as to obtain noise information, and a latch circuit for latching an output from the discriminating circuit such that in response to the noise information from the detecting circuit, a previous value of the outpt from the discriminating circuit is held, thus producing a discrimination output of the discriminating device.
    • 一种具有第一记录模式和第二记录模式的磁记录和再现装置,其中视频信号的亮度信号被转换成与第一载波频率相关的FM亮度信号和第二载波频率,以便被记录在 磁带包括识别装置或识别其中已经记录了从磁带再现以提供给重放电路的FM亮度信号的记录模式。 信号识别装置包括用于吸收再现信号的色散的自动增益控制(AGC)电路,具有第一带通滤波器和第二带通滤波器的鉴别电路,用于处理AGC电路的输出,以便 鉴别第一和第二模式,检测循环以相对于AGC电路的并行方式提供再现信号,使得检测信号的幅度,然后将其与预定值进行比较,以获得噪声信息 以及用于锁存来自识别电路的输出的锁存电路,使得响应于来自检测电路的噪声信息,保持来自鉴别电路的前导的先前值,从而产生识别装置的鉴别输出。
    • 10. 发明授权
    • Magnetic recording and reproducing apparatus
    • 磁记录和再现设备
    • US4786986A
    • 1988-11-22
    • US113603
    • 1987-10-28
    • Fumihiko YamanushiAtsushi YoshiokaKatsuyuki WatanabeMichio MasudaKuniaki Miura
    • Fumihiko YamanushiAtsushi YoshiokaKatsuyuki WatanabeMichio MasudaKuniaki Miura
    • H04N9/83H04N5/78
    • H04N9/83H04N9/833
    • A magnetic recording and reproducing apparatus of a cassette type has a first and a second recording mode converting a luminance signal of a video signal into an FM luminance signal having a first and a second carrier frequency and recording the FM luminance signal on a magnetic tape respectively. When the FM luminance signal is to be recorded according to the second recording mode, a magnetic tape having an excellent short wavelength recording characteristic is used for recording. A cassette containing this magnetic tape is provided with a configurational feature on its upper or lower half, and a detector for detecting this feature is disposed in the apparatus. When the detector detects that a magnetic tape is adapted for recording according to the first recording mode, the FM luminance signal is recorded according to the first recording mode, but when the detector detects that the magnetic tape is adapted for recording according to the second recording mode, the user can select either the first recording mode or the second recording mode as desired. A discriminating circuit is disposed in the reproducing system to discriminate as to whether the FM luminance signal was recorded according to the first recording mode or the second recording mode, and, on the basis of the result of discrimination by the discriminating circuit, the reproduced FM luminance signal is automatically processed in a processing circuit with a processing characteristic corresponding to the recording mode.