The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 15, 1982
Filed:
Apr. 24, 1979
William R Wray, Sudbury, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A sound receiving system has an array of microphone elements for producing output signals in response to incident sound, and signal processing means for processing the output signals to provide the array with pre-selected directional acceptance and rejection characteristics. Such processing includes integrating the difference between the output signals of a pair of elements to produce an integrated signal, summing the outputs of the same or different pair of elements to obtain a sum signal, and combining the integrated signal with the sum signal. The spatial position of pairs of elements and their orientation permit closely spaced pairs of elements to exhibit a single highly directional characteristic, or two angularly related highly directional characteristics. Thus, an array of microphone elements clustered at essentially a point location can exhibit either monaural or stereophonic characteristics, depending upon the type of signal processing applied to their outputs. To minimize wind noise pickup, low frequency components of the integrated signal are suppressed to produce a filtered integrated signal, and high frequency components in the output signal of at least one of the elements are suppressed for producing a filtered output signal. The two filtered signals are added together to produce a resultant signal wherein only the higher frequency information signals will be directionally picked up and amplified.