公开(公告)号：US4083036A

公开(公告)日：1978-04-04

申请号：US707035

申请日：1976-07-20

申请人： Johannes P. M. Bahlmann ,  Wilhelmus A. J. M. Zwijsen

发明人： Johannes P. M. Bahlmann ,  Wilhelmus A. J. M. Zwijsen

IPC分类号： G10H1/057 ,  G10H5/00 ,  H03G3/10 ,  H03K3/00 ,  H03K3/64 ,  H03K4/02 ,  H03K5/00 ,  H03K5/003 ,  H03K6/00 ,  G11C7/00

CPC分类号： G10H5/00 ,  G10H1/057 ,  H03K3/00 ,  H03K4/026 ,  H03K5/003 ,  H03K6/00

摘要： An arrangement suitable for producing pulse-shaped signals whose amplitude is determined by a control voltage in an electronic musical instrument. The arrangement comprises a first transistor having a control electrode to which the control voltage is applied and a main electrode connected to a point of fixed potential via an impedance. The arrangement further comprises means for transferring the output current of the first transistor, which current is determined by the control voltage, to an output in a pulse-shaped fashion. In order to convert the unipolar current pulses into bipolar current pulses the arrangement includes a second transistor whose input circuit is connected in parallel with the input circuit of the first transistor. The output current of this second transistor is subtracted from the output current of the first transistor by means of a current amplifier, the result being available at the output.

公开(公告)号：US4549143A

公开(公告)日：1985-10-22

申请号：US628179

申请日：1984-07-06

申请人： Maurice Bouland ,  Wilhelmus A. J. Van Gurp ,  Wilhelmus A. J. M. Zwijsen

发明人： Maurice Bouland ,  Wilhelmus A. J. Van Gurp ,  Wilhelmus A. J. M. Zwijsen

IPC分类号： H03D3/06 ,  H03D3/00 ,  H04N9/64 ,  H04N9/66 ,  H04N11/18

CPC分类号： H03D3/006 ,  H04N11/186 ,  H03D2200/0064

摘要： An F.M. demodulation circuit can be rendered insensitive to amplitude, level and waveform variations of the frequency-modulated carrier signal by using a frequency-demodulator (33,37) tuned to half the frequency of the carrier and preceded by a divide-by-two divider (21).

摘要翻译： 一个F.M. 可以通过使用被调谐到载波频率的一半的频率解调器（33,37）并在二分频除法器之前使解调电路对调频载波信号的幅度，电平和波形变化不敏感 21）。

公开(公告)号：US4520393A

公开(公告)日：1985-05-28

申请号：US427056

申请日：1982-09-29

申请人： Wilhelmus A. J. M. Zwijsen ,  Cornelis P. J. Duijndam ,  Wouter Smeulers

发明人： Wilhelmus A. J. M. Zwijsen ,  Cornelis P. J. Duijndam ,  Wouter Smeulers

IPC分类号： H04N5/08 ,  H04N5/04

CPC分类号： H04N5/08

摘要： A synchronizing circuit arrangement for deriving and processing a synchronizing signal contained in an incoming video signal. The composite synchronizing signal is obtained by means of a comparator stage to which the video signal and a clipping level are applied, and is applied to a line synchronizing circuit. This line synchronizing circuit comprises a synchronization detector for detecting the synchronized state between the line synchronizing pulses obtained and the locally generated pulses of the line frequency. In the synchronized state the peak level detector, by means of which the clipping level is derived, is switched to operate as a mean-value detector which is operative during the occurrence of keying pulses of line frequency occurring during those periods when the video signal assumes a value corresponding with the peak level of the synchronizing pulses.

摘要翻译： 一种用于导出和处理包含在输入视频信号中的同步信号的同步电路装置。 通过施加视频信号和限幅电平的比较器级获得复合同步信号，并将其施加到线路同步电路。 该线路同步电路包括用于检测所获得的线路同步脉冲与线路频率的本地产生的脉冲之间的同步状态的同步检测器。 在同步状态下，峰值电平检测器（通过其导出限幅电平）被切换为平均值检测器，以在视频信号呈现的那些周期期间发生的线频率的键控脉冲发生期间工作 与同步脉冲的峰值电平对应的值。