Presentation on theme: "Bits is Bits? Right? Check Again. George Blood, Safe Sound Archive Joint Technical Symposium Oslo, Norway Monday, May 3, 2010."— Presentation transcript:
Bits is Bits? Right? Check Again. George Blood, Safe Sound Archive Joint Technical Symposium Oslo, Norway Monday, May 3, 2010
Typical Playback Chain Analog source Analog-to-digital converter Digital Audio Workstation Digital File Physical Carrier of Files
Typical Playback Chain Analog source Analog-to-digital converter Digital Audio Workstation Digital File Physical Carrier of Files }
From ADC to Digital File ADC Digital Output (AES-3) Cable/patching/switching Digital Audio Workstation: Digital File Computer: CPU/Bus/etc. Driver Software OS/Drivers Storage interface/drivers: FW, USB, SATA, FC, iSCSI Storage Device (HDD) Interface: AES-3 to FW/USB/etc.
Disappointments Don’t mention brands Don’t tell you our solution Very pervasive problem http://www.avpreserve.com/wp- content/uploads/2010/01/Digital_Audio_Inter stitial_Errors.pdf
Disappointments Planned to announce a software tool to automate this testing….
Tested Hardware Lynx AES16 M-Audio (96 and 192) M-Box Metric Halo ULN-2 Nagra V SonicStudio 302 (aka ULN2+DSP)
Tested Software Boom Metric Halo Console ProTools LE (Mac) Sonic Solutions HDSP Sonic Studio soundBlade SoundForge WaveLab
Tested OS Mac OS9 Mac OS X Windows 98 Windows Home Windows ME
What happened? New Hardware –Failure Reviewed set up with engineer –Failure Reviewed old systems –Failure Simplified Test –Finally some passes –Failures continue between identically configured systems
Qualifying a Control Round Robin Test –A≠B –B≠C –A=C –…B is wrong
Qualifying a Control Assumes only one variable at play –Host –I/O Hardware –Driver –Application …test configuration
Hardware in hand SonicStudio –Great editor –Semi-proprietary file types –Non-destructive editing –No support for WAV or BWF output –No AES-31 ADL support Nagra V –Simple –Self-contained –Can’t change variables (other than resolution)
Results Null tests passed Every time Always Validates testing procedures
Talent Pool Head of QA with physics background 2 experienced audio engineers 2 dealers 2 outside technical engineers
Tech “support” Universally appalling Short attention span Don’t understand concepts Always some other link in chain Regional sales reps care more Engineer curious but unable to help
Computer code “traps” Intractable problem buried in code Build routine to watch for it Applies fix Efficient solution
More absurdities Same hardware, different ages, different results Same configuration, different results on different days Same hardware, good results with one software; poor results with different software
Conclusions Get what you pay for –More expensive hardware & software performs better in Null tests Stock drivers aren’t as good as hardware specific drivers –keep up to date, especially after OS upgrades Non-host-based systems perform significantly better Mac-based systems performed better than PC-based systems, but are far from flawless Worst PC and Worst Mac systems equally bad These problems are widely known by manufacturers and blatantly hidden
Your consent to our cookies if you continue to use this website.