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Self-adapting method and device of sigma delta modulator

An adaptive and modulator technology, applied in the field of communication, to improve the output signal-to-noise ratio

Active Publication Date: 2012-03-21
HUAWEI TECH CO LTD
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  • Claims
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Problems solved by technology

[0006] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: if this technique is used, the demodulator must obtain the signal q generated by the adaptive structure (n) To demodulate correctly, the demodulator needs to be modified

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  • Self-adapting method and device of sigma delta modulator

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0025] In order to maintain the stability of the modulator within a large dynamic range of the input signal without changing the demodulator side. An embodiment of the present invention provides an adaptive method for a ΣΔ modulator. Such as image 3 As shown, the steps include:

[0026] 101. Acquire a normalized mean value of an input signal and a normalized mean value of an output signal.

[0027] In this embodiment, first, the input signal needs to be delayed...

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Abstract

The embodiment of the invention discloses self-adapting method and device of a Sigma Delta modulator, relating to the communication field. In order to keep the stability of the modulator within a wider input signal dynamic range on the premise of not changing a modulator terminal, the embodiment of the invention provides the following technical scheme: acquiring a normalization average value of an input signal and a normalization average value of an output signal; and adjusting a feedback signal according to the normalization average value of the input signal and the normalization average value of the output signal.

Description

technical field [0001] The present invention relates to the communication field, in particular to an adaptive method and device for a ΣΔ modulator. Background technique [0002] The ΣΔ modulator uses noise shaping and oversampling techniques, and can use a lower number of digits or even a one-bit quantizer to achieve very high resolution. When a high-resolution ADC (Analog to Digital Converter, analog-to-digital converter) and DAC (Digital to Analog Converter, digital-to-analog converter) is widely used in the field of digital audio. [0003] In practical applications, the stability and output signal-to-noise ratio of the ΣΔ modulator are closely related to the input signal. When the dynamic range of the input signal is large, it is very easy to cause the ΣΔ modulator to be unstable, and the output signal-to-noise ratio deteriorates. For this reason, an adaptive ΣΔ modulator is often used to overcome this problem. The adaptive ΣΔ modulator can detect the working state of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M3/00
Inventor 何松柏殷为民胡世飞游飞张希坤韦前华
Owner HUAWEI TECH CO LTD
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