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Tuner using a direct digital frequency synthesizer, television receiver using such a tuner, and method therefor

机译：使用直接数字频率合成器的调谐器，使用这种调谐器的电视接收机及其方法

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摘要

A television tuner (920) is adapted for use in a television receiver (900) that receives a radio frequency (RF) signal from an input device (910) and outputs audio and video information from a selected channel in response thereto. The television tuner (920) includes a direct digital frequency synthesizer (206) and a mixer (220). The direct digital frequency synthesizer (206) has an output for providing a digital representation of a mixing signal. The mixer (220) has a signal input for receiving a television signal, a mixing input coupled to the output of said direct digital frequency synthesizer (206), and an output for providing an intermediate frequency (IF) television signal.

机译：电视调谐器（ 920 ）适用于电视接收机（ 900 ），该电视接收机从输入设备（ 910 < / B>），并响应于此从选定频道输出音频和视频信息。电视调谐器（ 920 ）包括直接数字频率合成器（ 206 ）和混频器（ 220 ）。直接数字频率合成器（ 206 ）具有用于提供混合信号的数字表示的输出。混频器（ 220 ）具有用于接收电视信号的信号输入，耦合至所述直接数字频率合成器（ 206 ）的输出的混频输入以及用于提供中频（IF）电视信号。 展开▼

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公开/公告号US2005117071A1

专利类型

公开/公告日2005-06-02

原文格式PDF

申请/专利权人 RICHARD A. JOHNSON;
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申请/专利号US20040018474

发明设计人 RICHARD A. JOHNSON;
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申请日2004-12-21

分类号H04N5/44;

国家 US

入库时间 2022-08-21 22:23:53

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