Out of frustration I created a little Frame Rate Delay & Pro Tools Offset Calculator. It displays millisecond duration for frame, 1/4 frame, & sample duration. It also calculates pro tools 1/4 frame video Continue reading →
For many when confronted with the terms dBFS, dBu, +4/-10, VU, etc their eyes gloss over. Without understanding a few simple concepts, integrating your DAW with external hardware can be a game of trial & frustration.
To properly drive & take full advantage of hardware in the analog realm, you need to 1st understand what signal level the device is designed to receive. This is when dBu comes into play.
dBu – (dB in reference to 1 mW at 600 ohms, equal to 0.775 V) All you really need to know is this is a measurement standard for audio signals.
Most professional audio gear is made/calibrated to function in a +4 dBu = 0VU environment. This means when a +4 dBu signal hits the hardware input, it will read 0 VU on the hardware’s VU meter.
VU – Unit of measurement originally developed in 1939 by the combined effort of Bell Labs and broadcasters CBS and NBC for measuring and standardizing the levels of telephone lines.
The question that often comes up is “How do my DAW levels relate to my hardware?”
Ever wonder why the timing of what you record sounds so off? Or why you get phase problems while parallel processing out of the box? Well you might just have horrible timing, or you might need to figure out your I/O offsets. A/D D/A’s, drivers, & software can all contribute to this problem.
For everyone that designs, tests, creates, calibrates, or has an odd preference for what they consider “listening enjoyment”, This is for you.
Having calibrated utility & test files is a must for any audio engineer. The corner-stone being pink noise. When it comes to generating tones/noise ITB I have found most DAW to be severely lacking in this area. After much frustration with the incorrect Pro Tools signal generator “Pink”. I’ve captured Tones/Noise from a calibrated D-Scope & Dolby SDU4. I’ve also included the “industry standard” DMU file that is most commonly used.
Update 9-17-10 : Duende-V2.19.0 x64 Hardware Driver.zip I received a signed driver from Sydec/SSL. Great customer service. This is the latest hardware driver for the 2.x series & to be used with the 2.5.9 plugins.