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Noise Generator TMS320C5000 DSP Code
Description:
this routine generates signed random noise samples having a Gaussian distribution.
The code is based on a pseudo-random generator which repeats every ~2x10^9
samples. The generator output is converted into samples having Gausssian
Probability Density Function (PDF) and Cumulative Distribution Function
(CDF) distributions. The crest factor, i.e. the peak signal sample relative
to the Root-Mean-Square (RMS) value, is 6.15. Thus for a set RMS value
(by assembler equate) of 4096 decimal, the peak signal obtainable is ~±25,000.
The software is in the form of
two callable subroutines, one for start-up initialisation and one for
generation of each sample. Successive calls of the main routine generate
successive noise samples that are uncorrelated. The code is re-entrant
so multiple noise generators in one DSP can readily be implemented.
Performance: (values measured over complete pseudo random cycle)
| RMS error : | 0.0004dB |
| Correlation: | <= -66dB (adjacent 4 samples) |
| PDF error: | <= 0.002 |
| CDF error : | <= 2% |
Full performance results are available.
Processor Load:
|
MIPS#
|
Data
memory (words)
|
Prog
memory (words)#
|
|
0.45
|
2
|
0.15k
|
- #figures are for TMS320C54x operation with the assembler interface at 8kHz sampling
Availability: NOW - sale is under licence - integration support offered
