PNW chair Chris Deckard made opening remarks, then Rick Chinn talked about a pending July field trip to Milwaukie OR to see a mastering and disc pressing plant. Date TBA and people would provide their own transportation and expenses. Dan Mortensen then talked about the upcoming Aug. 21 Antique Radio Society swap meet at the SCC parking lot and the PNW AES Section participating. Dan also mentioned the AES world elections and encouraged voting.

PNW elections were held at this Business Meeting. After some confusion about needing ballots, it was determined that there was actually one candidate per seat, except one seat (Dan Mortensen's) will be vacant for only 1 year. The 1 year committee person will have to be decided. Otherwise, the slate was accepted by voice vote/acclamation.

The new slate of officers and committee-members is as follows:

• Officers:
  • Chair - Dan Mortensen
  • Vice chair - James (JJ) Johnston
  • Treasurer - Lawrence Schwedler
  • Secretary - Gary Louie
• New Committee Members:
  • Paul Colvin
  • Stephen Devore
  • Steve Macatee
  • Dana Olson
  • Marlie Pesek
  • Rich Williams

Prior to founding THAT Corporation, Mr. Hebert was with dbx, Inc. from 1981 through 1989, where he held several positions, the last being Electrical Engineering Manager. He was responsible for a number of audio product designs marketed under the dbx, ADC, and Audio Dynamics brands. He also worked with semiconductor manufacturers on ICs used in the dbx Noise Reduction licensing program. He began his career at automated test equipment manufacturer Teradyne.

Mr. Hebert holds seven patents in the audio electronics field. He has authored and presented several papers for the Audio Engineering Society. He earned a BSEE from the Massachusetts Institute of Technology in 1979.

Gary began with a history of THAT Corp - founded in 1989, spun off from dbx, and the name is from the founders (Paul Travaline, Gary Hebert, And Les Tyler).

Next, he described characteristics of modern analog microphone preamps, and how digitally controlling their gain is used in modern products. He showed a typical mic preamp circuit, and how the gain is adjusted with feedback resistors. A digitally controlled array of resistors in the feedback circuit is the essence of their first controller ICs. He also talked about characteristics of doing resistors and switches in silicon, and using tapped strings of resistors for large gain changes and paralleling resistors for small steps.

He noted that this approach was somewhat expensive. Gary described several things that were done to reduce costs, and talked about the tradeoffs:

• make gain steps 3dB instead of 1 dB
• make the IC dual channel
• eliminate the on-chip servo output offset circuit, at the expense of needing a largish external capacitor.
• design a different feedback circuit to use the switchable resistor arrays, with less max gain (51dB). This turns out NOT to be so bad with typical preamps and A/D converters, although the THD can be a bit more. Noise ends up actually better at most gains.
• Fudge some LSBs (least significant bits) in the resistor array control to get better lower gain accuracy.
• scale down the size of resistors on the silicon die. While bigger is better, smaller is cheaper.

A refreshment break was held, then some door prizes were awarded:

• Courtesy Gary Hebert and THAT Corp:
  • THAT thermal bottles: Rene Jaeger, Paul Colvin, Chris Deckard
  • THAT gift certificates for IC samples: Tom Stiles, Steve Malott, Larry Aamodt
• Courtesy Steve Malott, Sony Book of Digital Audio Technologies, 1st ed presented to Kai Scheer

• Can he talk about any products using this part?
  • He can't talk, except about a new Zoom device.
  • Several major names use THAT products, perhaps an open secret.
• comments about parts taking a long time (years) to develop.
• discussion of noise specs and their derivation.
• discussion of different manufacturers using either or both THAT preamp ICs and/or THAT controllers.
• A customer may ask for the ability to add "color" to their preamp.
• VCA market discussion