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    • 9. 发明授权
    • Bit clock signal generator for use in a digital signal demodulator
    • 位时钟信号发生器用于数字信号解调器
    • US4777452A
    • 1988-10-11
    • US102997
    • 1987-09-30
    • Atsushi HayamiTsuyoshi OnoKazuo HikawaTakeshi Shimizu
    • Atsushi HayamiTsuyoshi OnoKazuo HikawaTakeshi Shimizu
    • H03K5/00G11B20/10G11B20/14H03K5/135H04L7/027H04L25/40H04B1/16
    • G11B20/1403G11B20/10
    • This invention relates to a digital audio tape recorder using a rotary magnetic head. On the tape which has been recorded using R-DAT, signals forming to the industry standards are recorded at a standard tape speed. The tape is caused to run at a speed faster than the standard tape speed and the recording signal is subjected to high speed reproducing while maintaining the rotational frequency of the head at a rotational speed at the time of recording. For realizing this, a bit clock signal generator for use in a digital signal demodulator is provided, which comprises means for generating a detection window pulse having a predetermined pulse width shorter than a period of a bit clock signal from either of time points of rise and fall of the waveform of a signal to be demodulated, or from both the time points thereof, said signal to be demodulated being a digital signal modulated in accordance with a modulation system such as a system constituted with a periodical signal intermittently including a phase information of the bit clock signal to deliver the detection window pulse to a phase locked loop including a phase comparison circuit and a voltage controlled oscillator as a comparison wave, thus allowing the voltage controlled oscillator in the phase locked loop to generate a bit clock signal, characterized by the provision of means for changing the pulse width of the detection window pulse in correspondence with changes in a bit rate of the demodulated signal.
    • 本发明涉及使用旋转磁头的数字音频磁带录像机。 在使用R-DAT记录的磁带上,以标准磁带速度记录形成行业标准的信号。 使磁带以比标准磁带速度更快的速度运行,并且记录信号经受高速再现,同时在记录时将磁头的旋转频率保持在转速。 为了实现这一点,提供了一种用于数字信号解调器的位时钟信号发生器,其包括用于产生具有比来自时间点上升的位时钟信号的周期短的预定脉冲宽度的检测窗脉冲的装置,以及 要解调的信号的波形的下降,或者从它们的两个时间点起,要被解调的信号是根据诸如由周期性信号构成的系统调制的数字信号,周期性信号间歇地包括相位信息 该位时钟信号用于将检测窗脉冲传送到包括相位比较电路和压控振荡器作为比较波的锁相环,从而允许锁相环中的压控振荡器产生位时钟信号,其特征在于 提供用于根据位老鼠的变化改变检测窗脉冲的脉冲宽度的装置 e的解调信号。
    • 10. 发明授权
    • Separation band detecting circuit in an automatic program selection
record player
    • 自动程序选择记录播放器中的分离带检测电路
    • US4464740A
    • 1984-08-07
    • US377846
    • 1982-05-13
    • Tsuyoshi OnoFumiaki Ohno
    • Tsuyoshi OnoFumiaki Ohno
    • G11B3/085G11B3/095G11B3/38G11B17/06
    • G11B3/0957G11B3/08512
    • A separation band detecting circuit is used in an automatic program selection record player which has a photodetector which moves together with a tone arm and comprises a light-emitting element for emitting light against the surface of the record and a photosensitive element for receiving the light reflected at the record surface and producing an output in accordance with the light quantity of the received reflected light. The detecting circuit comprises an operational amplifier supplied with the output of the photodetector to its one input terminal, and a time constant circuit connected to the other input terminal of said operational amplifier, for giving a threshold level with respect to the operational amplifier and giving a time constant with respect to the level fluctuation in the threshold value. The time constant circuit varies the threshold level with a time constant, according to an input signal level to the one input terminal of the operational amplifier. The operational amplifier inverts its output when the relationship between amplitudes of the input signal level and the threshold level reverses.
    • 分离带检测电路用于具有与色调臂一起移动的光电检测器的自动程序选择记录播放器,并且包括用于向记录表面发射光的发光元件和用于接收光反射的光敏元件 在记录表面上并根据所接收的反射光的光量产生输出。 检测电路包括一个运算放大器,该放大器提供有光电探测器的输出到其一个输入端,以及时间常数电路,连接到所述运算放大器的另一个输入端,用于给予运算放大器的阈值电平, 相对于阈值的电平波动的时间常数。 根据对运算放大器的一个输入端的输入信号电平,时间常数电路根据时间常数改变阈值电平。 当输入信号电平和阈值电平的幅度之间的关系反转时,运算放大器反相其输出。