Left-growth double-edge UPWM signal frequency spectrum estimation method based on digital PWM generator

A digital signal and signal spectrum technology, which is applied in the field of spectrum estimation of left-increasing double-edge uniform sampling pulse width modulation signals, can solve the problems of inapplicability, and achieve the effect of simple and convenient calculation and analysis process

Active Publication Date: 2019-09-20
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology

However, this method is also not applicable when the modulating signal is a digital signal
According to the above analysis, when the modu

Method used

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  • Left-growth double-edge UPWM signal frequency spectrum estimation method based on digital PWM generator
  • Left-growth double-edge UPWM signal frequency spectrum estimation method based on digital PWM generator
  • Left-growth double-edge UPWM signal frequency spectrum estimation method based on digital PWM generator

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Embodiment Construction

[0037] Combine below Figure 2 to Figure 8 The process of constructing the spectrum estimation expressions of the left-increased double-edge two-level UPWM signal and the left-increased double-edge three-level UPWM signal is described in detail and completely.

[0038] A method for estimating the frequency spectrum of a left-increasing double-edge UPWM signal based on a digital PWM generator. First, according to the sampling frequency and quantization level of the input digital signal of the digital PWM generator, the left-increasing double-edge two-level UPWM signal output by the digital PWM generator is Discretize and quantize in the time domain to obtain a series of discrete points; then use the distribution law of the amplitude of the discrete points to perform discrete Fourier transform on these discrete points, and compare the transformation results with the frequency response function of the zero-order holder Multiply to obtain the spectrum estimation expression of the ...

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Abstract

The invention provides a left-growth double-edge UPWM (Uniform-sampling Pulse Width Modulation) signal frequency spectrum estimation method based on a digital PWM generator. The method comprises the steps of: performing discretization and quantization of a left-growth double-edge second-level UPWM signal output by a digital PWM generator on a time domain to obtain a series of discrete points; adopting the distribution rule of the amplitudes of the obtained discrete points, performing discrete Fourier transform for the discrete points, and multiplying a transform result by the frequency response function of a zero-order keeper, so that a left-growth double-edge second-level UPWM signal spectrum estimation expression is obtained. The second-level UPMW signal spectrum estimation expressions obtained by modulating the input signals of the digital PWM generator before and after the inversion of the input signal are subtracted to obtain a corresponding third-level UPWM signal spectrum estimation expression. The method provided by the invention can directly obtain the frequency spectrum of the left-growth double-edge UPWM signal under the condition that the input modulation signal is a digital signal.

Description

technical field [0001] The invention relates to the field of digital class D audio power amplifiers, in particular to a method for estimating the frequency spectrum of a left-increasing double-edge uniform sampling pulse width modulation signal modulated by a digital audio signal. Background technique [0002] The power efficiency of digital class-D audio power amplifier is higher than that of linear audio power amplifiers such as class A, class B and class AB, and digital class-D audio power amplifier also has the advantage of being able to directly interface with digital audio sources, so it has become a research hotspot in the field of power amplifiers. The structure diagram of digital class D audio power amplifier is as follows: figure 1 As shown, it usually consists of a digital interpolation filter, a Sigma-Delta modulator, a digital pulse width modulation (Pulse Width Modulation, PWM) generator, a power stage and an analog low-pass filter. exist figure 1 Among them,...

Claims

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Application Information

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IPC IPC(8): G01R23/20G01R23/16
CPCG01R23/16G01R23/20
Inventor 于泽琦陈光伟张恩光田二林王凤琴张珂陈晓雷
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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