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Welcome Remco Stoutjesdijk of ItsOnlyAudio.com!
- Remco calls himself a “recovering audiophile”
- Why didn’t we stop trying to improve audio setups in the 70s?
- Remco started with vacuum tubes but moved into silicon at Wolfson Micro. He got his first job by writing a letter asking if they needed anyone and his hobby projects helped to place him into special projects group.
- “If you work in hardware you play with simulators. If you work in software, you play with hardware”. This is why he moved into applications.
- For a little while, he worked at Rohm Semi on LEDs
- Back into audio with ASK industries, who make hardware that is used in stereo setups for cars that are branded with Bang & Olafsson and Burmester.
- Differences between car and home
- Extreme conditions, like Audi running a 36 hour “sun test”
- Fixed acoustic environment
- One thing they did was to develop a tuning tool for the end brand (ie. B&O) to tweak with their experts
- Big things they were working on was outside noise cancellation and engine noise cancellation
- However, not all sound is bad. “Putting the car in ‘sport mode’ pumps more sound into the cabin”
- They’re really trying to find the acoustic transfer function (of say, the engine) to reverse any impact it has on the listener’s ears.
- Unwanted noise is first put through a filter. Then they have to apply filter before sound arrives.
- An example transform is a Levinson-Durbin recursion
- Active Noise Control (ANC) isn’t really “cancellation”
- It’s important to think about the stability, since it’s a control system
- Often they’re looking for the lambda coefficient
- After going out on his own, Remco and his family moved to Poland. Polish is a difficult language to learn. It’s on a remote branch of the “tree of languages” (which show the inheritance of different languages and the other languages they’re based upon)
- Poland has a growing tech scene
- Past guests Jan Rychter and Michael Gielda from Ant Micro (and most of the team) are based in Poland, though in different areas. “7Sensing” is another dev shop out there.
- Remco is now consulting via ItsOnlyAudio.com and is a member of the Consulting forum (apply here if interested in joining).
- When not working on client projects, he is building up IP library and bringing demos to audio shows
- ADI Sharc DSP
- Shannon Parks episode
- Tools of the trade for doing audio on chips
- CMSIS DSP library
- Components of that library
- Biquad filter
- DMA buffers
- Ring buffers
- Loudness war website
- Push to custom silicon are necessary for super phase sensitive items
- PTP – Precision Time Protocol based on UDP
- Chris wondered if Disney World does something like this to synchronize speakers throughout the park? BoingBoing article
- Dunte protocol
- Audio ecosystem is fairly small, though there are some startups now
- Modern audio need to tie into Alexa / Google / Apple for streaming
- OCA – open control alliance (warning: autoplay audio??)
- Signal processing / fidelity is as good as it can get, wow we need to improve playback environment
- Improving noise comfort for loud urban environment
- Chris and Remco have both used binaural beats to try and drown out sound in the past
- Find Remco online
Interesting interview with high signal to noise ratio . Every success to your guest who seems balanced and competent .
Hette Elgersma says
Remco is a quirky engineer… aren’t they all 🤓… I really loved to work together with. Nice interview resembling the person I got familiar with 😉
This was a very nice, interesting and enjoyable episode!
Thumbs up to Remco and thank you Chris for inviting him!