公开(公告)号：US5473290A

公开(公告)日：1995-12-05

申请号：US323691

申请日：1994-10-18

Applicant: Pascal Scomazzon ,  Pascal Pignon

Inventor： Pascal Scomazzon ,  Pascal Pignon

IPC: H04H20/34 ,  H04L27/18 ,  H04L27/20

CPC classification number: H04H20/34 ,  H04L27/18 ,  H04H2201/13

Abstract: A variable-throughput digital modulator receives at an input a transmission digital signal e(t). The transmission digital signal is time-based demultiplexed (1) into first and second elementary transmission signals e1(t) and e2(t) which are applied, respectively, to first (21) and second (22) filtering circuits for delivering first and second filtered elementary signals e1f(t) and e2f(t). A circuit (20) provides throughput switching control to the first and second filtering circuits (21, 22) for selecting a first or second filtering mode corresponding to a first throughput at a first type of modulation or a second throughput at a second type of modulation. A quadrature modulator (3) receives the first and second filtered elementary signals in order to modulate an RDS-compatible carrier f0, and an output filter circuit (5) delivers a filtered modulated carrier signal for broadcast, such as in supplementary data broadcasting in FM radio broadcasting.

Abstract translation: 可变吞吐量数字调制器在输入端接收传输数字信号e（t）。 传输数字信号被时分解复用（1）到分别施加到第一和第二（22）滤波电路的第一和第二基本传输信号e1（t）和e2（t）中，用于传送第一和第二 第二滤波元素信号e1f（t）和e2f（t）。 电路（20）向第一和第二滤波电路（21,22）提供吞吐量切换控制，用于在第一类型调制时选择对应于第一吞吐量的第一或第二滤波模式或第二类型调制的第二吞吐量 。 正交调制器（3）接收第一和第二滤波后的基本信号，以便调制RDS兼容载波f0，输出滤波电路（5）传送经过滤波的调制载波信号进行广播，如FM中的补充数据广播 无线电广播。