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

Digital Automatic Level Control for Analog-to-Digital Conversion

The severity of overloads in an analog-to-digital converter circuit (A/D) as the analog input signal exceeds the dynamic range of the A/D has long been a target for any designer to solve. Not only the analog signal spectrum becomes infested with fast-rising clipping distortion but the harmonics generated by clipping the high frequencies can fold back and aggrevate the aliasing problem upon digital-to-analog (D/A) conversion. One obvious solution is to place an automatic gain control (AGC) circuit before the A/D, but analog methods generally have failed since the AGC must be transparent, i.e. no degradation, to the A/D; and be threshold, i.e. inactive until the analog signal approaches overload level; not to mention the side effects of breathing or signal pumping. With the advent of high-performance digitally-controlled attenuators (DCA's), a digital signal processor (DSP) can be utilized to provide precise threshold, instantaneous attack and many programmable features that suffers no drawbacks or side effects of the analog design. Further enhancement techniques can also provide more sophistication such as adaptive control process.

Author:
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