The Amp Hour

An Interview With Dafydd Roche

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Welcome, Dafydd Roche of TI and ExpatAudio!

    • Dafydd works in the audio group at TI as a definition engineer. One example product is the PCM1865, also discussed on /r/nicechips
    • Almost all chips need to be marketed for the mass market now, not single customers.
    • Rule of thumb: Number of bits * 6 = dB of range
      • 24 bit = ~144 db of range
      • The eardrum tightens when subjected to loud noises.
      • Zipper noise
      • Dafydd has a side business with another UK expatriate called Expat Audio.
      • He has an ECM93 Pick and Place machine. Another rule of thumb is if you're not going to use the machine weekly, it's probably not worth it.
      • Hardware controlled chips are easier because it just takes resistors to set functions on the chip (no FW)
      • Development boards allow engineers to try out new features by "blue wiring it in"
      • Peak Music Power Output - PMPO
      • Watts are often listed as a percentage of THD.
      • Speakers are 1%. Additionally, toom accoustics will ruin the best speakers
      • One of the parts Dafydd has helped design is 600W single chip amplifier.
      • NPR did comparisons on bit rates to show that most people can't hear the difference. 
      • 1V RMS signal w/ 130 dB range...ends up being tens of nV at the low end of the scale. 
      • Henry Ott was on the show, Dafydd loves his book.
      • We asked about the low material chip packages, in case audio could have the same problem as the Xenon flash bug for RPi. Dave did a video about this:
      • Future projects will be remote control of analog, recall setups using storage.
        • Many thanks to Dafydd for being on the show, you can reach him as @ExpatAudio on twitter and on their FB page
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        The Amp HourBy The Amp Hour (Chris Gammell and David L Jones)
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