公开(公告)号：US20090028346A1

公开(公告)日：2009-01-29

申请号：US12009961

申请日：2008-01-23

Applicant: Tain-Rein Chen ,  Wan-Jung Lin ,  Shih-Bin Wen ,  Chien-Shan Chiang

Inventor： Tain-Rein Chen ,  Wan-Jung Lin ,  Shih-Bin Wen ,  Chien-Shan Chiang

IPC: H04H20/48

CPC classification number: H04H20/48

Abstract: A digitized FM (frequency modulation) stereo multiplexing circuit for an FM stereo transmitter has a digital audio I/O interface, a digitized FM stereo multiplexing circuit, a low-pass filter and an FM circuit. When a digital audio data is inputted, a digital audio decoder decodes the digital audio data to acquire left and right channel audio signals. The left and right channel audio signals are inputted to an over-sampling unit circuits to process sampling and then to output to an FM stereo multiplexer. The FM stereo multiplexer then generates a master signal and a secondary signal by processing the sampled left and right channel audio signals. In the meanwhile a switch signal and a pilot signal are acquired with an address counter to output from a memory unit. Then the master signal, the secondary signal and the pilot signal are combined as the digital FM stereo data.

Abstract translation: 用于FM立体声发射机的数字化FM（频率调制）立体声复用电路具有数字音频I / O接口，数字化FM立体声多路复用电路，低通滤波器和FM电路。 当输入数字音频数据时，数字音频解码器解码数字音频数据以获取左右声道音频信号。 左声道和右声道音频信号被输入到过采样单元电路以处理采样，然后输出到FM立体声多路复用器。 FM立体声多路复用器然后通过处理采样的左声道和右声道音频信号来产生主信号和次信号。 同时，用存储器单元输出的地址计数器获取开关信号和导频信号。 然后将主信号，次信号和导频信号组合为数字FM立体声数据。