Bruce Hofer
Bruce Edward Hofer (b. 1948 in Portland – ?) worked as an assistant in the Lab Instruments division of Tektronix while studying at Oregon State University. After graduading in in Electrical Engineering in 1970, he joined Tek fulltime, working on the 7000 series.
Hofer worked on 7000-series time base design, partly with Art Metz, Les Larson.
He later switched to audio, designing low distortion oscillators and harmonic distortion measuring equipment (lead engineer on the SG505 audio oscillator and the AA501 distortion analyzer, and TM5000 plugins).
Unable to convince Tek management there was a market for this, in 1984 Bruce quit and cofounded Audio Precision with Bob Metzler, Richard Cabot, and Bob Wright.
Audio Precision became the world standard for audio test equipment manufacturers. Bruce became majority owner of AP in 2002.
Hofer along with Bob Metzler helped launch Preamble Instruments.
Links
- View From The Top: Bruce Hofer, Audio Precision
- My Years at Tektronix by Bruce Hofer @ vintagetek.org
Documents Authored by Bruce Hofer
| Document | Page | Class | Title | Author(s) | Year | Refers to |
|---|---|---|---|---|---|---|
| Tekscope 1976 V8 N1.pdf | 2 | Article | Delta Time Measurement for the 7000 Series | Paul Farley • Les Larson • Bruce Hofer | 1976 | 7B85 • 7B80 • DM40 • DM43 |
| Tekscope 1980 V12 N3.pdf | 14 | Article | Automatic Distortion Analyzer Speeds Distortion Measurements | Bruce Hofer | 1980 | AA501 • SG505 |
Products by Bruce Hofer
Components by Bruce Hofer
Patents by Bruce Hofer
| Page | Office | Number | Title | Inventors | Company | Filing date | Grant date |
|---|---|---|---|---|---|---|---|
| Patent US 3843873A | US | 3843873A | Counter having selective direction and variable rate control | Bob Beville • Bruce Hofer • Bill Peek | Tektronix Inc | 1972-09-19 | 1974-10-22 |
| Patent US 4009399A | US | 4009399A | Gated ramp generator | Bruce Hofer | Tektronix Inc | 1976-02-05 | 1977-02-22 |
| Patent US 4132958A | US | 4132958A | Feedbeside correction circuit for an amplifier | John Addis • Bruce Hofer | Tektronix Inc | 1977-10-31 | 1979-01-02 |
| Patent US 4296381A | US | 4296381A | Distortion reduction circuit for an inverting feedback amplifier | Bruce Hofer | Tektronix Inc | 1979-10-01 | 1981-10-20 |
| Patent US 4302738A | US | 4302738A | Noise rejection circuitry for a frequency discriminator | Richard Cabot • Bruce Hofer | Tektronix Inc | 1980-04-11 | 1981-11-24 |
| Patent US 4382233A | US | 4382233A | Multiple-feedback path filter | Bruce Hofer | Tektronix Inc | 1980-11-12 | 1983-05-03 |
| Patent US 4344029A | US | 4344029A | Automatic IM distortion test selector | Richard Cabot • Bruce Hofer | Tektronix Inc | 1981-05-11 | 1982-08-10 |
| Patent US 4560958A | US | 4560958A | State variable oscillator having improved rejection of leveler-induced distortion | Bruce Hofer | Tektronix Inc | 1984-02-24 | 1985-12-24 |
| Patent US 4563652A | US | 4563652A | Dual-stage filter with feedback | Bruce Hofer | Audio Precision | 1985-04-12 | 1986-01-07 |
| Patent US 4614914A | US | 4614914A | Low-distortion transformer-coupled circuit | Bruce Hofer | Audio Precision | 1985-04-12 | 1986-09-30 |
| Patent US 4811395A | US | 4811395A | Two-tone test signal method for BTSC calibration | Edward J. Cleary Jr. • Bruce Hofer | Tektronix Inc | 1987-10-08 | 1989-03-07 |
| Patent US 5336989A | US | 5336989A | AC mains test apparatus and method | Bruce Hofer | Audio Precision | 1991-09-19 | 1994-08-09 |
| Patent US 7268711B1 | US | 7268711B1 | Method and circuit for amplitude compensation in a digital-to-analog converter | Bruce Hofer | Audio Precision | 2006-03-24 | 2007-09-11 |