公开(公告)号：US20050190304A1

公开(公告)日：2005-09-01

申请号：US10834177

申请日：2004-04-29

申请人： Jong Ryu ,  Duck Kim ,  Dong Moon ,  Dae Lee ,  Kyu-O Jeon

发明人： Jong Ryu ,  Duck Kim ,  Dong Moon ,  Dae Lee ,  Kyu-O Jeon

IPC分类号： H04N5/38 ,  H04B1/18 ,  H04N5/208 ,  H04N5/40 ,  H04N7/04

CPC分类号： H04N5/40

摘要： Disclosed herein is RF modulator with a narrow bandpass filter. The RF modulator for modulating video and audio signals into RF signals corresponding to a frequency band of a predetermined channel includes an oscillation unit for generating a predetermined RF signal suitable for the frequency band of the predetermined channel; a mixer for modulating the video and audio signals using the RF signal generated from the oscillation unit; and a narrow bandpass filter for receiving an RF-modulated signal from the mixer, and passing only a signal of the frequency band of the predetermined channel from among the RF-modulated signal. Therefore, the RF modulator can remove or block unnecessary components such as lower side band and harmonic-frequency signals generated after video and audio signals have been RF-modulated, such that it can prevent interference between channels from being generated, resulting in the creation of more excellent video and audio signals.

摘要翻译： 本文公开了具有窄带通滤波器的RF调制器。 用于将视频和音频信号调制成对应于预定信道的频带的RF信号的RF调制器包括用于产生适合于预定信道的频带的预定RF信号的振荡单元; 混频器，用于使用从振荡单元产生的RF信号来调制视频和音频信号; 以及窄带通滤波器，用于从混频器接收RF调制信号，并且仅从RF调制信号中仅通过预定信道的频带的信号。 因此，RF调制器可以去除或阻止在视频和音频信号被RF调制之后产生的低边带和谐波频率信号等不必要的部件，使得它可以防止信道之间的干扰被产生，导致产生 更优秀的视频和音频信号。