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Apparatus for reducing electromagnetic wave interference and method thereof

An electromagnetic wave and spread spectrum technology, which is applied to color TV parts, TV system parts, TVs, etc., can solve problems such as data loss and image distortion

Inactive Publication Date: 2005-01-19
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, doing so may result in data loss
Because the frequency of the spread spectrum pulse is different from that of the original pulse, and the input data is still input according to the frequency of the original pulse, it is easy to lose data and cause image distortion

Method used

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  • Apparatus for reducing electromagnetic wave interference and method thereof
  • Apparatus for reducing electromagnetic wave interference and method thereof
  • Apparatus for reducing electromagnetic wave interference and method thereof

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Embodiment Construction

[0031] Figure 4 It is the relationship between the frequency and time of the traditional spread spectrum pulse and the original pulse. The frequency of the original pulse is, for example, fixed at 40 MHz, and the frequency of the spread spectrum pulse after spreading is stably swept between 38 MHz and 42 MHz, and the sweep period T is, for example, 1 / 30K second. Each cycle has an upward correction point, for example, at time T / 4, the frequency of the spread spectrum pulse is revised from downward decrease to upward increase; and there is a downward correction point, for example, at time 3T / 4, the frequency of the spread spectrum pulse The frequency of is changed from increasing upwards to decreasing downwards. The wider the frequency of the spread spectrum pulse is, that is, the greater the spread frequency of the spread spectrum pulse, the more effectively the electromagnetic wave interference can be improved. However, since the output of data is based on the spread spectru...

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Abstract

The invention is a device and method for decreasing electromagnetic wave disturbance. The invention generates frequency-expanded pulse according to original pulse, and receives the data bit stream according to original pulse, and outputs data bit stream according to frequency expanded pulse. The invention includes: frequency expanded buffer, which is used to store data bit stream temporarily; frequency generator, which generates frequency expanding pulse according to the frequency rising signal and the frequency decreasing signal; frequency expanding controller, which is used to decide the frequency rising signal and the frequency decreasing signal according to the storage of the frequency expanding buffer.

Description

technical field [0001] The present invention relates to a device and method for reducing electromagnetic wave interference, and in particular to a device and method for reducing electromagnetic wave interference in the form of spread spectrum pulses. Background technique [0002] Electromagnetic interference (EMI) often occurs between electronic products, so the intensity of the radiated electromagnetic waves must be limited. For example, the Federal Communications Commission (FCC) of the United States has formulated a set of standards to limit the radiation dose of electronic products. [0003] figure 1 is a schematic diagram of the radiation intensity of a pulse signal. The radiation intensity I of a single frequency f0 signal easily exceeds the EMI standard, which is marked as Ie. A general solution to EMI is, for example, to spread the spectrum of the signal to prevent radiation intensity from concentrating on a certain frequency, thereby reducing electromagnetic wave...

Claims

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Application Information

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IPC IPC(8): G09G3/36H04N5/66
Inventor 卜令楷黄崇铭
Owner HIMAX TECH LTD
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