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Delta-sigma modulation-based analog signal quantization method and device

A technology of analog signal and quantization method, applied in the field of signal processing, can solve the problem of low signal-to-noise ratio, and achieve the effect of improving the signal-to-noise ratio, equalizing the output data and improving the quality

Pending Publication Date: 2022-01-07
HUAZHONG UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the defects and improvement needs of the prior art, the present invention provides an analog signal quantization method and device based on delta-sigma modulation, the purpose of which is to solve the technical problem of low signal-to-noise ratio in the existing analog signal quantization method

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  • Delta-sigma modulation-based analog signal quantization method and device
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  • Delta-sigma modulation-based analog signal quantization method and device

Examples

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Embodiment 1

[0049] An analog signal quantization method based on delta-sigma modulation, such as figure 1 shown, including:

[0050] Performing delta-sigma modulation on the analog signal to be transmitted to obtain a first digital signal;

[0051] Making a difference between the first digital signal and the original analog signal to obtain a first differential signal; the differential signal is quantization noise;

[0052] After filtering out the out-of-band noise in the first differential signal, amplify it, and perform delta-sigma modulation to obtain the second digital signal; the power of quantization noise is low, and delta-sigma modulation has certain requirements on the amplitude of the input signal Therefore, in this embodiment, the quantization noise is amplified before delta-sigma modulation to ensure that its amplitude meets the amplitude requirements of delta-sigma modulation;

[0053] Combine the first digital signal and the second digital signal into one digital signal to...

Embodiment 2

[0068] An analog signal quantization device based on delta-sigma modulation, such as figure 2 shown, including:

[0069] a first delta-sigma modulator 101, and figure 2 In the DSM1, its input terminal is used to receive the analog signal to be transmitted, and it is used to perform delta-sigma modulation on the analog signal to be transmitted to obtain the first digital signal;

[0070] The first differential circuit 102, its first input end is connected to the output end of the first delta-sigma modulator 101, its second input end is used for receiving the analog signal to be transmitted, and it is used for the first digital signal and the original Making a difference of the analog signal to obtain a first differential signal;

[0071] The first filter 103, the input end of which is connected to the output end of the first differential circuit 102, which is used to filter out-of-band noise in the first differential signal to obtain in-band noise;

[0072] An electrical a...

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Abstract

The invention discloses an analog signal quantization method and device based on delta-sigma modulation, and belongs to the field of signal processing, and the method comprises the steps: carrying out the delta-sigma modulation of a to-be-transmitted analog signal, and obtaining a first digital signal; subtracting the first digital signal from an original analog signal to obtain a first differential signal; filtering out-of-band noise in the first differential signal, amplifying the first differential signal, and performing delta-sigma modulation to obtain a second digital signal; combining the first digital signal and the second digital signal into a path of digital signal to obtain a quantization result of the analog signal; dividing the quantization result of the analog signal into two paths of digital signals so as to restore a first digital signal and a second digital signal; subtracting the reduced first digital signal from the attenuated second digital signal to obtain a second differential signal; and filtering components outside the signal frequency band in the second differential signal so that the original analog signal is obtained through reduction. The technical problem that an existing analog signal quantization method is low in signal-to-noise ratio can be effectively solved.

Description

technical field [0001] The invention belongs to the field of signal processing, and more specifically relates to a method and device for quantizing an analog signal based on delta-sigma modulation. Background technique [0002] In many application scenarios, it is necessary to perform ADC (Analog-to-Digital Converter, analog-to-digital converter) sampling on analog signals. For example, in some communication scenarios, in mobile front haul, it carries information The part that is transmitted from the data center to the base station, and then the base station uses the antenna to send the information to user terminals such as mobile phones. Since the analog signal is easily interfered by noise, and the digital signal has strong anti-noise ability, therefore, the analog signal Before the signal is transmitted from the data center to the base station, the analog signal is converted into a digital signal through ADC sampling, and the information is transmitted to the base station...

Claims

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Application Information

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IPC IPC(8): H03M3/00
CPCH03M3/364
Inventor 杨奇钟林晟邹阳戴潇潇程孟凡邓磊刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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