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.
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 $33 for non-members, $5 for AES members and is free for E-Library subscribers.