Amplitude-modulated signal envelope detection method and system
An amplitude modulation signal and envelope detection technology, applied in the field of signal processing, can solve problems such as envelope signal distortion, and achieve the effect of improving accuracy and avoiding envelope signal distortion
Active Publication Date: 2014-12-17
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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[0006] Based on this, it is necessary to provide a method and system for envelope detection of amplitude modulated signals to solve the problem of envelope signal distortion in the process of envelope detection
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[0022] The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0023] Such as figure 1 As shown, it is a schematic flow chart of an embodiment of the AM signal envelope detection method of the present invention, including steps:
[0024] Step S101: Obtain the frequency of the AM signal and the carrier signal corresponding to the AM signal;
[0025] When the carrier frequency is obtained, the amplitude modulation of the sine wave modulation signal to the carrier signal, the frequency of the sine wave modulation signal, and the peak value of the carrier signal can also be obtained.
[0026] Step S102: Obtain cycle time according to the frequency;
[0027] Step S103: Delaying the AM signal by a quarter cycle according to the cycle time to obtain a first delayed signal;
[0028] Step S104: Delaying the AM signal by a half cycle according...
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The invention discloses an amplitude-modulated signal envelope detection method and system. The method comprises the following steps: obtaining frequency of an amplitude-modulated signal and frequency of a carrier signal corresponding to the amplitude-modulated signal; obtaining periodic time according to the frequency; performing a quarter periodic delay on the amplitude-modulated signal according to the periodic time to obtain a first delay signal, and performing a half periodic delay on the amplitude-modulated signal according to the periodic time to obtain a second delay signal; multiplying a difference value between the amplitude-modulated signal and the second delay signal by one half to obtain a third signal; squaring the first delay signal to obtain a first squaring signal, and squaring the third signal to obtain a second squaring signal; and summing the first squaring signal and the second squaring signal and performing extraction of root to obtain an envelope signal of the amplitude-modulated signal. By adopting the scheme provided disclosed by the invention, the envelope signal distortion produced in the detection process can be avoided, and the accuracy of the envelope signal is effectively improved.
Description
technical field [0001] The invention relates to the technical field of signal processing, in particular to an envelope detection method and system for an amplitude modulation signal. Background technique [0002] Modulation means that the signal to be transmitted by the sending end (its frequency is generally lower) is added to the high-frequency oscillating signal. Among them, attaching the signal to the high-frequency oscillation is to use the signal to control a certain parameter of the high-frequency oscillation, so that this parameter changes with the signal. The high-frequency oscillation wave is the vehicle that carries the signal, so it is also called a carrier. After demodulation at the receiving end, the signal carried by the carrier is taken out to restore the information. The demodulation process is also called wave detection. [0003] The signal obtained by controlling the amplitude of the carrier signal with a modulating signal is also called an amplitude modu...
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Inventor 李军旁志强万文军
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID