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

Optimum Use of Noise Reduction in FM Broadcasting

A well-known problem in FM broadcasting is the excessive high-frequency preemphasis introduced by the 50- or 75-µs time constants now used. With modern program material the preemphasis results in possible overmodulation and the need for high-frequency limiting. If limiting is avoided in order to maintain signal integrity, then operation at an overall decreased level is required. The use of Dolby B-type compression during transmission provides an opportunity to reduce the preemphasis time constant to 25 µs, which permits the midband modulation level to be raised significantly with many types of program material. Listeners with conventional receivers are provided with a compatible signal but with the reception advantages of an increased modulation level. Listeners with 25-µs deemphasis time constants and B-type expanders have the dual advantages of increased level and lower noise.

Author:
Affiliation:
JAES Volume 21 Issue 5 pp. 357-362; June 1973
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