Patent ID: 7676052

Claim:
An apparatus including a differential microphone assembly for converting an acoustic pressure field emitted by a source to one or more electrical signals, comprising: a substrate; processing circuitry disposed on said substrate, responsive to a plurality of transducer signals corresponding to a received acoustic pressure field by providing one or more corresponding output signals and including amplifier circuitry responsive to said plurality of transducer signals by providing a plurality of buffered signals, signal combining circuitry coupled to said amplifier circuitry and responsive to said plurality of buffered signals by providing at least one combination signal, and signal enhancement circuitry coupled to said signal combining circuitry and responsive to said at least one combination signal by providing at least one of said one or more corresponding output signals; and a plurality of acoustic transducers mutually coupled mechanically collectively coupled mechanically to said substrate, collectively coupled electrically to said processing circuitry and responsive to said received acoustic pressure field by providing said plurality of transducer signals, wherein each one of said plurality of mutually coupled acoustic transducers includes a membrane having an orientation, and each one of said plurality of membrane orientations is at least approximately orthogonal to a respective one of a plurality of substantially mutually exclusive directions.