AES E-Library

An Analog LSI Dolby Pro-Logic Decoder I.C.

An integrated-circuit version of the Dolby Pro-Logic surround-sound system is presented. The IC described is the most complete analog implementation to date of Pro-Logic on a chip, and contains all of the core functions for Pro-Logic including autobalance, noise generation, the active decoding matrix and center channel mode control. The chip is capable of three or four channel decoding mode, and provides a bypass for normal stereo. All modes are controlled by a parallel digital interface which is TTL or CMOS compatible. The chip contains thirty op amps, ten low-noise VCA's, a new circuit element called an operational conveyor amplifier, two dual-output rectifiers, two log-difference amplifiers, comparators, random logic and a digital noise source. It is implemented on an advanced BiCMOS process with complementary MOS and bipolar transistors, oxide capacitors and laser-trimmable thin-film resistors. The IC contains approximately 2000 devices and utilizes 54,000mil squared of area.

Author: Henry, Peter S.
Affiliation: Precision Monolithics, Inc., Santa Clara, CA
AES Convention:89 (September 1990) Paper Number:2944 Import into BibTeX
Subject:Reproduction of Spatial Sound

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: (CD aes11)   /pp8690/pp9009/3027.pdf

Start a discussion about this paper!