I tried your _graticule_ but it reminded me of my Cossor 339[A] Oscillograph given to me when I was a young kid but reverted back again.
Well Quicktime Player is now capturing a signal CRUCIFYINGLY slowly.
The image is a low level signal around 1KHz whistled into the microphone.
This line in the QT capture had me stumped all of yesterday evening, 27-08-2019, then voila I went to bed and slept on it and realised my mistake:
Yes it was converting to '.wav' but was ignoring the sample rate and it wasn't until I woke up this morning I realised I was using double quotes and '@' is important in perl.
The code so far. A few additions to cater for '_bit_error_', '_noise_floor_' artifacts affecting the display.
As I have not done the drawing routine yet then the image of the low level whistle into mic looks as though it is joined up.
I am beginning to enjoy this as it has been much harder to do than in the shell, believe it or not.
I still feel the shell is unbelievably flexible for my uses, but perl makes me think for a change.
BTW I have found pdfs' of the first two books and will be using them for the next stages, many thanks for the information.
I have no idea if those pdfs' contain malware, but I don't care... ;o)
Bazza.
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