公开(公告)号：US3697892A

公开(公告)日：1972-10-10

申请号：US3697892D

申请日：1971-02-19

Applicant: BELL TELEPHONE LABOR INC

Inventor： LAWRENCE THOMAS R ,  SALTZBERG BURTON R

IPC: G06F1/03 ,  H04L27/12

CPC classification number: G06F1/0321 ,  G06F2101/04 ,  H04L27/12

Abstract: FSK signals in a digital sense are obtained from a memory comprising a table of forty numbers, representing amplitudes of points in one cycle of a sine wave, the points being separated by equal phase angles. A processor reads out, at a fixed rate, the numbers corresponding to each tenth or each eleventh point in accordance with the condition of an incoming binary signal, whereby the output numbers represent a frequency-shift wave. Digital circuitry is used and the modulator may be time shared by a plurality of data sources.

Abstract translation: 从数字意义上的FSK信号是从包含四十个数字的表的存储器获得的，表示正弦波的一个周期中的点的振幅，这些点被相等相位角分隔。 处理器以固定速率根据输入二进制信号的条件读出对应于每十位或第十一点的数字，由此输出数字表示频移波。 使用数字电路，并且调制器可以由多个数据源进行时间共享。