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    • 12. 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。
    • 15. 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。
    • 16. 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.
    • 20. 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。