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:
Feb. 12, 1985
Filed:
Oct. 29, 1982
Mohamed A Marouf, Lisle, IL (US);
Paul W Vancil, Lisle, IL (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
For use in multiport digital conference arrangements wherein speech samples of selected speakers are summed for distribution to the conferees, the disclosed method and apparatus controls the level of speech represented by information samples to be included in an output sample for distribution to the ports and equalizes the speech level between speakers to reduce speech level contrast heard by the conferees. In addition, a speech detector for each port and microprocessor-controlled switching hardware also adjust the signal level represented by samples received on the ports to effect speaker selection. Furthermore, gain coefficients for a port may be incrementally adjusted during a predetermined period of time to avoid noticeble signal level changes when implementing speaker selection.