What is the type of white noise generated by SoX?

What is the type of white noise generated by SoX?

[James Trammell]

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Hi,

I have found SoX's synth effect useful for generating white noise; does
anyone know what specific type of white noise it generates?

The different types of white noise I am familiar with are:

White Gaussian
White triangular
White uniform
White binary

Is it one of these, or something else?

Thanks,
-James

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Re: What is the type of white noise generated by SoX?

[Måns Rullgård]

James Trammell <james.trammell@gmail.com> writes:

> Hi,
>
> I have found SoX's synth effect useful for generating white noise; does
> anyone know what specific type of white noise it generates?
>
> The different types of white noise I am familiar with are:
>
> White Gaussian
> White triangular
> White uniform
> White binary
>
> Is it one of these, or something else?

It uses this LCG (in util.h):

#define ranqd1(x) ((x) = 1664525L * (x) + 1013904223L) /* int32_t x */
#define dranqd1(x) (ranqd1(x) * (1. / (65536. * 32768.))) /* [-1,1) */

-- 
Måns Rullgård

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