公开(公告)号：US3660771A

公开(公告)日：1972-05-02

申请号：US3660771D

申请日：1970-11-30

Applicant: SITS SOC IT TELECOM SIEMENS

Inventor： BALUGANI FABIO ,  FORNASIERO PAOLO

IPC: H03K5/153 ,  H04L27/14 ,  H04L27/156 ,  H03D3/04

CPC classification number: H04L27/1563 ,  H04L27/14

Abstract: At the receiving end of a communication system utilizing a lower keying frequency f1 and a higher keying frequency f2 for the transmission of information, a counter with N/2 stages is stepped by clock pulses having a cadence Nf2. The incoming two-frequency wave is converted into a train of signal pulses occurring at the end of each half-cycle, these signal pulses being used to reset the counter which therefore does not generate an output if the signal pulses follow one another at a rate equal to or faster than 1/2 f2. With lower incoming frequencies, the counter sets a flip-flop which is then reset by the next signal pulse and which thereby generates a stepped wave to yield, on integration, a definite DC voltage.

Abstract translation: 在利用较低的键控频率f 1和较高的键控频率f 2进行信息传输的通信系统的接收端，具有节奏Nf2的时钟脉冲对具有N / 2级的计数器进行步进。 频率波被转换成在每个半周期结束时发生的一串信号脉冲，这些信号脉冲用于复位计数器，因此如果信号脉冲以等于或更快的速率彼此相邻，则计数器不产生输出 低于1 / 2f 2.当输入频率较低时，计数器设置触发器，然后由下一个信号脉冲复位触发器，从而产生阶跃波，在积分时产生一定的直流电压。

公开(公告)号：US3659226A

公开(公告)日：1972-04-25

申请号：US3659226D

申请日：1970-05-11

Applicant: SITS SOC IT TELECOM SIEMENS

Inventor： ANGELERI EMANUELE ,  BALUGANI FABIO

IPC: H03K3/72 ,  H04L27/12

CPC classification number: H04L27/122 ,  H03K3/72

Abstract: Two pulse trains with harmonically related repetition frequencies 1/To, 1/nTo are derived from an original square wave of cadence 2/To, the pulses of each train having the width To/4 of the square-wave pulses. With the aid of a second square wave of cadence To, produced by frequency halving from the original square wave, the two harmonically related pulse trains are additively or subtractively combined so as to produce an irregular pulse sequence with n + OR - 1 pulses in each period nTo of the lower-frequency train. A digital pulse counter derives from this irregular pulse sequency a low-frequency square wave converted, by filtration, into its fundamental sine wave whose frequency can thus be selectively varied, with only minor phase discontinuities, between three predetermined values related to one another as (n+1) : n : (n-1). In an alternative embodiment, the keying frequencies are related to the basic frequency as (2n+1) : 2n : (2n-1). The two pulse trains are generated by progressive frequency division, starting with the original square wave, and selective gating.

Abstract translation: 具有谐波相关重复频率1 / To，1 / nTo的两个脉冲序列从节奏2 / To的原始方波导出，每个列的脉冲具有方波脉冲的宽度To / 4。 借助于从原始方波频率减半产生的第二次方波，将两个谐波相关的脉冲串相加或相减组合，从而在每个周期内产生n +/- 1个脉冲的不规则脉冲序列 n至低频列车。 数字脉冲计数器从这种不规则脉冲序列中得出通过滤波转换成其基频正弦波的低频方波，其频率因此可以选择性地变化，只有较小的相位不连续性，在三个预定值之间相互关联为（ n + 1）：n：（n-1）。 在另一实施例中，键控频率与（2n + 1）：2n：（2n-1）的基本频率有关。 两个脉冲串是通过逐行分频产生的，从原始方波开始，选择性选通。

公开(公告)号：US3551888A

公开(公告)日：1970-12-29

申请号：US3551888D

申请日：1967-12-07

Applicant: SITS SOC IT TELECOM SIEMENS

Inventor： BALUGANI FABIO ,  MAMMUCARI FRANCO

IPC: H03K5/15 ,  H04J3/04 ,  H04Q9/00

CPC classification number: H03K5/15033 ,  H03K5/15013 ,  H03K5/15093 ,  H04J3/04