公开(公告)号：US3760197A

公开(公告)日：1973-09-18

申请号：US3760197D

申请日：1972-01-19

Applicant: INT VIDEO CORP

Inventor： DANN B

IPC: H03B1/00 ,  H03B5/12 ,  H04N5/94 ,  H03K5/08 ,  H03B3/02

CPC classification number: H04N5/94 ,  H03B5/1209 ,  H03B5/1231 ,  H03B5/1256 ,  H03B5/1296 ,  H03B2201/012

Abstract: A first pair of NPN transistors operate to amplify and limit an input signal. A second pair of NPN transistors, gated on by the first pair, function to provide the circuit output when an input is applied, and function together in conjunction with an RLC tank to oscillcate a predetermined frequency when no input is applied.

Abstract translation: 第一对NPN晶体管用于放大和限制输入信号。 由第一对选通的第二对NPN晶体管的作用是在施加输入时提供电路输出，并且在不施加输入时与RLC电池一起工作以振荡预定频率。

公开(公告)号：US3783398A

公开(公告)日：1974-01-01

申请号：US3783398D

申请日：1972-09-01

Applicant: INT VIDEO CORP

Inventor： DANN B

IPC: H03D3/04 ,  H03D3/18 ,  H03K5/08

CPC classification number: H03D3/04

Abstract: An FM pulse averaging demodulator particularly useful in high quality broadcast television video tape recorders and reproducers employing high carrier frequencies. Extremely constant area pulses are generated in response to a well limited FM signal by generating ramps in response to successive FM wave zero crossings. The ramps are applied to respective differential comparator/clipper pairs whose threshold level sets the demodulator gain. The resulting constant area pulses at each zero crossing are applied to a low pass filter which provides a demodulated signal having high linearity and excellent differential gain characteristics.

Abstract translation: FM脉冲平均解调器，特别适用于采用高载波频率的高质量广播电视录像机和再现器。 通过响应于连续的FM波过零点产生斜坡，响应于良好限制的FM信号而产生非常恒定的面积脉冲。 斜坡被施加到相应的差分比较器/限幅器对，其阈值电平设置解调器增益。 在每个过零点处产生的恒定区域脉冲被施加到低通滤波器，其提供具有高线性度和优异的差分增益特性的解调信号。