Decorrelating Audio Signals for Stereophonic and Surround Sound Using Coded and Maximum-Length-Class Sequences

This technology relates to the decorrelation of audio signals for use in surround sound techniques. Decorrelation improves listener envelopment and spatial immersion, but prior techniques suffer from unwanted timbre coloration and are computationally expensive. The present technology improves decorrelation by utilizing a pseudorandom sequence and a reciprocal of the pseudorandom sequence to convolve the audio signal into the desired number of output signals.

Asynchronous Network AudioVisual Collaboration System

This invention is directed to a hybrid asynchronous, distributed audiovideo group conferencing system.The invention eliminates the need to choose between the convenience of asynchronous messaging (such as email) and the interactive capabilities of full bandwidth conferences by providing sound and video in a recorded storage and retrieval system, indexed to facilitate examination and comprehension by distributed group members.Melding the beneficial attributes of asynchronous conferencing systems and full-channel audiovideo communication provides advantages greater than either set alone.

Error tolerant memory system

Current DRAM chips can ensure error-free data storage (except for radiation-induced soft errors), which largely simplifies the overall computing system design. Each DRAM cell contains one transistor and one capacitor. Unfortunately, it becomes increasingly challenging to maintain the sufficiently large capacitance (hence error-free data storage). It has become clear that STT-RAM has the true potential to complement or even replace DRAM as the main memory in computing systems. However, STT-RAM cannot achieve comparable bit cost as DRAM.

Asymmetrical multi-lane multi-phase motor drives

Multi-phase motor drives, including induction motors and permanent magnet motors, are used in a wide variety of applications and offer fault-tolerant operation under faults in motor windings and converter switches. Symmetrical multi-fed drives based on three-phase modules are of special interest in safety critical applications. They offer simple control under a fault condition. However, even a single open-circuit fault of one switch or winding will cause complete interruption of a faulty module.

Flux-Switching Linear Permanent Magnet Machine with Yokeless Translator

Rensselaer researchers have designed a convenient and inexpensive linear permanent magnet machine solution for transportation, conveyance, and other applications. When designed for short-strokes, the machine is very robust and rugged, and exhibits excellent performance characteristics such as very high thrust density, low ripples, and normal forces. Traditionally, linear PM machines had the armature windings in the translator and the PMs in the stator or vice-versa. This novel design allows both the field and armature excitations in the same part of the machine.


Conventional technologies used for the generation of solar power include building-integrated flat-plate photovoltaic (PV) systems, and stand-alone concentrating PV systems that are removed from the location of power application. Although these technologies work, widespread adoption of them for general use has been hampered by a number of impediments, such as the large amount of silicon needed for flat-plate systems, the cost and appearance of the stand-alone systems, and the relatively weak solar-to-electric operating conversaion efficiencies of both systems.


The current high-growth nature of digital communications demands higher speed serial communication circuits. Present day technologies barely manage to keep up with the present need to communicate at high speeds, e.g. gigabit, terabit, and higher transmission speeds. Multiplexers are often used but have different input and output rates, which can cause jitter in the output signal.


This technology couples the physical layer characteristics of wireless networks with key generation algorithms. It is based on the wireless communication phenomenon known as the principle of reciprocity which states that in the absence of interference both transmitter and receiver experience the same signal envelope. Signal envelope information can provide to the two transceivers two correlated random sources that provide sufficient amounts of entropy which can be used to extract a cryptographic key.