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:
Oct. 14, 1997
Filed:
Jan. 09, 1995
Stephen V Cahill, Palatine, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method and apparatus, performed by a communication unit (101), for substantially eliminating undesired noise in an audible output signal (113) while a determined quality measure (114) of a received signal (107) is below a predetermined threshold (201). At least a portion the received signal (107) is stored for a predetermined period of time to produce a stored signal (109). A measure of pitch period (111) of the stored signal (109) is determined. When the determined quality measure (114) of the received signal (107) drops below the predetermined threshold (201), a portion of the stored signal (109) is used, responsive to the determined measure of the pitch period (111), to produce the audible output signal (113). To match a boundary between an end of the received signal (107) and an end of the portion of the stored signal (109) a discontinuity between the end of the received signal (107) and the end of the portion of the stored signal (109) at the boundary is determined. Values for a predetermined correction function responsive to the measured discontinuity are determined. The predetermined correction function is applied to the end of the portion of the stored signal (109) to align the end of the portion of the stored signal (109) with the end of the received signal (107) at the boundary. When the determined quality measure (114) of the received signal (107) rises above the predetermined threshold (201), the received signal (107) is used to produce the audible output signal (113).