Flying Spot Scanner for Roll Reader
By Horst Mohr, forwarded by Robbie Rhodes
Horst has been helping me translate his article about the optical transcriber system he built. He is interested in the "Flying Spot Scanner" technique for transcribing music rolls of differing formats. (This technique was used, briefly, in the early 1930s for live television. The studio was very dark, and a single photodetector tube picked up the light reflected from the scene.)
His concern about "unneeded data" refers to the output signal of a line-scanner-detector, such as the CCD array which Jody used in Mike Ames' roll reader. In that system approximately 2000 pixels are received in each line, which must be "winnowed" to only 100 note channels of the piano roll data.
-- Robbie Rhodes
- - - - - - - -
Date: Mon, 19 Feb 1996 20:04:40 MEZ
From: "Horst Mohr" <mohr@nemeter.dinoco.DE>
To: "Robbie Rhodes" <rrhodes@foxtail.com>
I followed the discussion about light sources and photocopy technics with interest. Is there already a possibility to direct a slim light beam, laser or not, very fast(!), to every fixed point in a line by computer control?
I would like the computer to determine what is to be read, not to have a bucket full of unneeded data that must be sorted. That would be part of my next multi-format note roll reader.
Remember I am a realtime computing fan. Not really an expert, but since 1978 I learned some tricks.
h.m. |
(Message sent Tue 20 Feb 1996, 07:12:25 GMT, from time zone GMT-0800.) |
|
|
Mechanical
Music Digest™ Archives
