NVGate DSP computation SPU

Normal DSP

SPU computation for normal DSP : OR34 V1 - Or35V1 - OR36V1 OR36V22 (normal DSP) - OR38V1 - OR38V2 (Normal DSP).

Because of the linearity of the computation, we consider 1DSP = 12 SPU. This allow a simplification for SPU computation. So we can deduce:

FFT

Computation SPUs:

Bandwidth	Fdec	Resolution	Envelope	Zoom	SPU/Channel for Real-time	SPU/Channel for non Real-time
20k	1	401	No	No	1	0,5
10k	1	401	No	No	0,5	0,25
Nk	1	401	No	No	=N/20	=N/40
10k	2	401	No	No	1	1
5k	4	401	No	No	0,8	0,6
2k	10	401	No	No	0,6	0,6
1k	20	401	No	No	0,5	0,6
Lower than 1k	Higher than 20	401	No	No	0,5	0,5
20k	1	401 and below	No	No	1	0,5
20k	1	801	No	No	1,25	0,5
20k	1	1601	No	No	1,5	0,5
20k	1	3201	No	No	2	0,5
20k	1	6401	No	No	3	0,5
20k	1	401	No	No	1	0,5
20k	1	401	No	Yes	2	1,5
20k	1	401	No	No	1	0,5
20k	1	401	Yes	Yes	3	3

SOA

Computation SPUs:

Bandwidth (Hz)	Decimation factor	Resolution	SPU/Channel
20 k	1	401	3
10 k	1	401	1,5
N k	1	401	=(N*3)/20
10 k	2	401	2
5 k	4	401	1,3
2,5 k	8	401	1,1
1,25 k	16	401	0,9
625	32	401	0,8
313	64	401	0,7
156	128	401	0,6
78	256	401	0,6
20 k	1	401 and below	3
20 k	1	801	3,25

Sampling Frequency: set in Front-End/Inputs settings/Input sampling

FFT Bandwidth: set in FFTx/FFT analysis/range

==

Octave:

Bandwidth	Fdec	Reso	SPU/Channel for Real-time
25.6k	1	1/3rd	4
20k	1	1/3rd	3
12.8k	1	1/3rd	2
10k	1	1/3rd	1,5
20k	1	1/3rd	3,0
10k	2	1/3rd	2,0
5k	4	1/3rd	1,25
20k	1	1/1	1,5
20k	1	1/3rd	3
20k	1	1/12th	6
20k	1	1/24th	12

Sampling Frequency: set in Front-End/Inputs settings/Input sampling

1/N Oct Bandwidth: set in OCT/FFT analysis/range

OVA

Bandwidth	SPU/Channel for Real-time
25,6k	1,25
20k	1
12,8k	0,75
10k	0,5

The overall acoustic levels analysis requires 1 SPU per channel at 20 kHz bandwidth. The number of required SPUs is directly proportional to the analysis bandwidth (i.e. the sampling frequency divided by 2.56).

Advanced understanding of computation SPU for force DSP

Forget what you To understand the Force DSP computation. Let's explain on a more advanced way.

The