Cog's Auditory System
The Cog Shop
MIT Artificial Intelligence Laboratory
545 Technology Square, #920
Cambridge, MA 02139
||The sensors for Cog's auditory system are a pair
of electret condenser microphones normally used in hearing aid applications with favorable
characteristics (wide, flat frequency response). The microphones are mounted directly on
the head assembly with mechanical approximations of human pinnae (outer ear structures).
interface to Cog's computational system includes a custom-built stereo pre-amp which
amplifies the low-level microphone and connects to the audio analog-to-digital (A/D)
converters in the C40 DSP system. Stereo sampling occurs at 22.05kHz with 8bit resolution.
The primary purpose of the auditory system is to perform real-world, robust perceptual
sound tasks similar to that performed by human beings. An emphasis is place on integrating
the system with other modalities (vision, motor, etc.) to improve performance and
Sound localization has been performed, while current research is geared towards
multiple sound stream segregation.