AES Store

Journal Forum

Perceptual Effects of Dynamic Range Compression in Popular Music Recordings - January 2014
4 comments

Accurate Calculation of Radiation and Diffraction from Loudspeaker Enclosures at Low Frequency - June 2013
9 comments

New Measurement Techniques for Portable Listening Devices: Technical Report - October 2013
1 comment

Access Journal Forum

AES E-Library

Non Contact Phonographic Disks Digitisation Using Structured Colour Illumination

We propose an innovative contactless optical playing device for 78rpm and 33rpm lateral modulation phonographic disks, using structured colour illumination. An area of the disk is illuminated by a beam of rays, with colour depending on the direction of incidence, that are reflected by the groove wall towards a camera image. In contrast with standard methods, that measure the velocity of the groove at a single location, direct access to the audio signal value is obtained here directly from pictures through colour decoding, and the whole height of the groove wall is exploited. This colour coding allows for the detection of occluding dust, and automated interpolation of missing audio signal. Results on distortion, S/N ratio, and bandwidth are presented.

Authors:
Affiliation:
AES Convention: Paper Number:
Publication Date:
Subject:

Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location:

Start a discussion about this paper!


 
Facebook   Twitter   LinkedIn   Google+   YouTube   RSS News Feeds  
AES - Audio Engineering Society