This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

Uniform Noise Generator

Generate uniformly distributed noise between upper and lower bounds

    Note:   Uniform Noise Generator will be removed in a future release. Use the MATLAB Function block and rand function instead.


Noise Generators sublibrary of Comm Sources


The Uniform Noise Generator block generates uniformly distributed noise. The output data of this block is uniformly distributed between the specified lower and upper bounds. The upper bound must be greater than or equal to the lower bound.

You must specify the Initial seed in the simulation. When it is a constant, the resulting noise is repeatable.

If all the elements of the output vector are to be independent and identically distributed (i.i.d.), then you can use a scalar for the Noise lower bound and Noise upper bound parameters. Alternatively, you can specify the range for each element of the output vector individually, by using vectors for the Noise lower bound and Noise upper bound parameters. If the bounds are vectors, then their length must equal the length of the Initial seed parameter.

Attributes of Output Signal

The output signal can be a frame-based matrix, a sample-based row or column vector, or a sample-based one-dimensional array. These attributes are controlled by the Frame-based outputs, Samples per frame, and Interpret vector parameters as 1-D parameters.

The number of elements in the Initial seed parameter becomes the number of columns in a frame-based output or the number of elements in a sample-based vector output. Also, the shape (row or column) of the Initial seed parameter becomes the shape of a sample-based two-dimensional output signal.


Noise lower bound, Noise upper bound

The lower and upper bounds of the interval over which noise is uniformly distributed.

Initial seed

The initial seed value for the random number generator.

Sample time

The period of each sample-based vector or each row of a frame-based matrix.

Frame-based outputs

Determines whether the output is frame-based or sample-based. This box is active only if Interpret vector parameters as 1-D is unchecked.

Samples per frame

The number of samples in each column of a frame-based output signal. This field is active only if Frame-based outputs is checked.

Interpret vector parameters as 1-D

If this box is checked, then the output is a one-dimensional signal. Otherwise, the output is a two-dimensional signal. This box is active only if Frame-based outputs is unchecked.

Output data type

The output can be set to double or single data types.

See Also

Random Source (DSP System Toolbox™ documentation); rand (built-in MATLAB® function)

Introduced before R2006a

Was this topic helpful?