公开(公告)号：US3798544A

公开(公告)日：1974-03-19

申请号：US3798544D

申请日：1972-08-23

Applicant: INT STANDARD ELECTRIC CORP

Inventor： NORMAN P

IPC: H04B3/06 ,  H04L25/03 ,  H04L25/48 ,  H04L27/08 ,  H04B1/00

CPC classification number: H04L25/03866 ,  H04B3/06 ,  H04L27/08

Abstract: This relates to a PCM system having a substantially constant power amplitude distributed throughout the frequency spectrum of a digital signal. This enables selecting a suitable portion of the spectrum of the digital signal for operation of the AGC circuits of the system, particularly those AGC circuits contained in predetermined ones of repeater incorporated in the system. To accomplish this, the system includes, in the transmitter, a pseudo-random scrambler operating on a binary signal input to provide the substantially constant power amplitude distributed throughout the frequency spectrum of the input binary signal. The output signal of the scrambler is converted to a ternary signal prior to transmission. At the receiver the ternary input signal is converted to a binary signal. The binary signal at the output of the last converter is descrambled to compensate for the scrambling of the scrambler and to produce a replica of the binary input to the system.

Abstract translation: 这涉及一种具有分布在数字信号的整个频谱范围内的基本上恒定的功率幅度的PCM系统。 这使得能够选择用于系统的AGC电路的操作的数字信号的频谱的适当部分，特别是包含在并入系统的预定中继器中的那些AGC电路。 为了实现这一点，该系统在发射机中包括在二进制信号输入上操作的伪随机扰频器，以提供分布在输入二进制信号的整个频谱范围内的基本恒定的功率幅度。 扰码器的输出信号在传输之前被转换为三进制信号。 在接收机处，三进制输入信号被转换为二进制信号。 对最后一个转换器输出端的二进制信号进行解扰，以补偿加扰器的加扰并产生二进制输入到系统的副本。