how to creat noise signal in vhl

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i have problems: How to creat noise gaussian or normal noise in vhdl ??? and how to simulate sine wave and sin wave+ noise in modelsim altera

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shift register based prbs can generate pseudo random noise.

LUTs also can be used to store whatever type of noise you get from tools like matlab e.g. gaussian.

You add noise signal to your signal sample by sample.

sine wave can be generated from luts by hand or nco compiler.

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shift register based prbs can generate pseudo random noise.

LUTs also can be used to store whatever type of noise you get from tools like matlab e.g. gaussian.

You add noise signal to your signal sample by sample.

sine wave can be generated from luts by hand or nco compiler.

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how LUTs can store signal ,and how to convert gaussan from matlab to vhdl,i đon't understand ???

how can generate sine wave by LUTs( i know nco blocks)

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how LUTs can store signal

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insert your data in mif files for ram to play

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and how to convert gaussan from matlab to vhdl,i đon't understand ???

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I didn't say that. you create mif file from data

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how can generate sine wave by LUTs( i know nco blocks)

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use nco compiler, that does it all for you

You will need to make some research for all that before diving as it seems you are a beginner

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insert your data in mif files for ram to play

I didn't say that. you create mif file from data

use nco compiler, that does it all for you

You will need to make some research for all that before diving as it seems you are a beginner

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yeah,i'm a beginner,need to learn more

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Are you talking about creating noise only for simulation, or from an FPGA?

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just for simulation,thanks

VHDL does have a "uniform" function in the math_real package than can generate random numbers between 0.0 and 1.0, that you can use to inject randomness into your design.

Also, have a look at this http://osvvm.org/

It is a package of functions for constrained random generation with various distrubutions (including gaussian)

I'm surprised Dave hasn't weighed in on this, he has written an excellent tutorial on the subject along with sample code;

http://www.ovro.caltech.edu/~dwh/cor...r_tutorial.pdf

http://www.ovro.caltech.edu/~dwh/cor...torial_src.zip