公开(公告)号：US20140328233A1

公开(公告)日：2014-11-06

申请号：US14159218

申请日：2014-01-20

Applicant: MediaTek Inc.

Inventor： Yi-Shing SHIH ,  Che-Hung LIAO ,  Yuan-Hung CHUNG ,  Kun-Chien HUNG ,  Chin-Wei HUANG ,  Wei-Chen WANG ,  Tsai-Yuan HSU ,  Chao-Wen CHOU

IPC: H04W52/02

CPC classification number: H04W52/0229 ,  H04W52/029 ,  Y02D70/142

Abstract: A portable device for receiving broadcast information is provided. A mixer down-converts a radio-frequency signal with a local oscillation clock to provide an intermediate frequency signal. A filter is arranged to filter the intermediate frequency signal. An analog-to-digital converter converts the filtered intermediate frequency signal into a digital signal according to a sampling rate. The broadcast information is obtained according to the digital signal. The local oscillation clock has a first frequency in a normal mode and a second frequency in a power-saving mode, and the second frequency is lower than the first frequency.

Abstract translation: 提供了一种用于接收广播信息的便携式设备。 混频器用本地振荡时钟降频转换射频信号以提供中频信号。 滤波器被布置成对中频信号进行滤波。 模数转换器根据采样率将滤波后的中频信号转换为数字信号。 根据数字信号获得广播信息。 本地振荡时钟在正常模式下具有第一频率，在省电模式下具有第二频率，并且第二频率低于第一频率。