AES Store

Journal Forum

Reflecting on Reflections - June 2014
1 comment

Quiet Thoughts on a Deafening Problem - May 2014
1 comment

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

Access Journal Forum

AES E-Library

New Precise Calibration Method of Recorded Disc Level Using Laser Beam

Light pattern method is often used for the calibration of recorded level of disc records. A number of problems, however, are involved in the level calibration of high frequency range by using of the light pattern method. For example, as frequency increases, the ends of light pattern become obscure causing such problems like larger error in the measurement of the light pattern width. Intending to solve these problems, LASER was used as the light source so as the light pattern can be observed as the array of bright lines with different brightness. On the theoretical analysis of this phenomenon, following points were made clearly; 1) Bright lines are arranged at equal intervals and the intervals are affected by the frequency but are free from the influence of the recorded level. 2) the number of bright lines affected by both frequency and recorded level. Therefore, the approximate recorded level can be obtained by counting the number of the bright lines. 3) the bright lines have different brightness respectively and the brightness is affected by frequency and recorded level. The array, therefore, can be utilized for the calibration of recorded level of high accuracy.

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

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