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Chris Lacinak [email protected] | www.avpreserve.com
IASA 2010, Philadelphia November 5th, 2010
Addressing this issue and the general lack of proper testing for digital audio systems
FADGI Audio Performance Testing Project
Suite of 3 test and measurement projects #1 – Combination of AES-‐17 Test Method and and IASA
TC-‐04 Performance Specifications #2 – Interstitial Errors #3 – Measuring Clock stability over time
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
The Problem
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
The Problem
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
The Problem
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
The Problem
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
The Problem
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
Past Approaches to Prevention Reductionist
Disable x, y & z Optimize a, b & c Do g before f Etc….
Requires constant updating with: Each piece of software Each software upgrade Different Operating Systems (OS) OS upgrades
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
Past Approaches to Analysis Real-‐Time Analysis
Sound Card
Digital Stream
Hard Disk
Sound Card
D/A
Analyze &
Report
Errors Occur
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
Past Approaches to Analysis Non-‐Real Time
Sound Card
Digital Stream
Hard Disk
Sound Card
D/A
Analyze &
Report
Errors Occur
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
Past Approaches to Analysis Amplitude variation over time algorithm inaccurate
Major over and under reporting
Requires intensive manual review
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
Past Approaches to System Integrity Testing
Not representative of the nature of the problem
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
A Proposed Solution Constant monitoring
Comparative Analysis
Commonly used Null Test
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
Examples
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010
Status Teaming with Indiana University on a grant proposal in
support of further research and development of a tool Hardware Alignment Temporal Errors Amplitude Errors Supporting materials (tutorials, thresholds)
Goal of off-‐the-‐shelf, low-‐cost, open solution
Submitting as requests for official standards projects to AES SC on Test and Measurement
Chris Lacinak | www.avpreserve.com | IASA 2010, Philadelphia | November 5th, 2010