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Old 2010-09-04, 17:25
Kronsteen
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Neptune Latency - 19-23ms

This is my preliminary test of Neptune's latency.

I made a sample of a 10ms pulse at 880Hz, repeating every second with silence between repeats. It was mono, 44.1 kHz, 16 bit.

I put the sample in two Record audio tracks, one with Neptune as an insert effect, and bounced the result to disk as a loop, three times for each Nepune setting, then compared the delay between the two pulses.

With Neptune performing no pitch changes, the delays were 844, 964 and 964 samples, giving an average of 942.

With Neptune performing chromatic correction but with no corrections actually done because the source was in tune already, the delays were all 964, obviously giving an average of 964.

With Neptune pitching the sample up by 12 semitones, the delays were 818, 818 and 715, averaging to 783.6. There was some distortion of the delayed sound - see picture 1.

With Neptune pitching the sample down by 12 semitones, the delays were 1019, 1019 and 1036, averaging to 1024.6. In one of the three, there was a significant distortion - see picture 2.

In conclusion, Neptune has a delay of between 19 and 23 milliseconds, and can unpredictably distort the waveform when repitching.

The delay is too long for live vocal use - I tried it - but with some mathematical juggling of tempo and an assumed average delay, samples can be shifted back on the timeling by a number of ticks to compensate.
Attached Images
File Type: jpg Neptune Latecncy Test P1.jpg (20.2 KB, 171 views)
File Type: jpg Neptune Latecncy Test P2.jpg (22.1 KB, 162 views)

Last edited by Kronsteen; 2010-09-04 at 17:47.
 

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