Jack oscilloscope

Current aim: special-purpose instrument: I'm trying to scratch my
itch: something to display waveforms and measure transfer functions
for analog audio circuit design.

What I've seen (xoscope, qoscc) and built (pdp_scope~) doesn't cut it.

Needed:
 - "Digital phosphor"
 - fast display
 - sync
 - possibly pitch detection


Entry: Initial project
Date: Fri Dec 10 20:14:15 EST 2010

- Need a jack input skeleton which is essentially a delay line.
- Some opengl based drawing routine.
- Minimal ui.


Ok, the first 2 where quite simple (positive edge trigger).  The ui is
for later.  What's more important is a proper trigger routine that can
display a semi stable waveform for non-periodic signals, and periodics
with multiple crossings.



Entry: Trigger
Date: Sat Dec 11 01:16:37 EST 2010

Can't really trigger on zero crossing, as they tend to shift around
due to detuned (dispersed) harmonics and chords.

What could be fixed is:
  - trigger a single harmonic (i.e. root)
  - don't loose any data inbetween periods