Compressor reference value

Hi Mark:

Please be aware the the maximum value that the built in dB converter has is 6dB. If you go past that limit you will start getting incorrect results (same goes for most compressors except for the extended range). The RMS compressor 0dB point is actually -3dB, this is because of the RMS value used in calculating the envelope feeding the compressor. Please run your experiments with this in mind and don't go above 6dB. Use a Readback Block to validate your results and a sine tone as a source. Don't use a DC value cell since you will loose what the influence of the RMS average. You can also use the level detectors to see where your signal is.

Let me know if this is clear.

Miguel

Most of what you have stated is fairly obvious, but my fundamental question is still unanswered.

What is the reference of the quoted dB values?

From some experiments it seems to be Full Scale. Is this correct? If so will someone please include it in the documentation!!!

Mark,

That's correct. The reference is full-scale, so 0 dB = 1.0 FS and 6 dB = 2.0 FS. Typically, digital number systems are defined such that nothing can exceed 1 FS, but since we add 4 bits of headroom in the DSP core, you can actually increase the signal to 16.0 FS (+24 dBFS).

More information can be found here: What are the number formats for SigmaDSP?

and here: 5.23 to linear

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EZ Admin