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. 27, 1996
Filed:
Nov. 24, 1993
Toshio Honda, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A digital sound level control apparatus for adjusting the reception sound level from all telephone circuits to a substantially fixed level comprises a region discrimination circuit for discriminating a PCM input data signal from a PCM conversion section, including a segment coder for compressing and decompressing a digital audio signal, among an intrinsic variation signal, a basic normalization level signal and a coding threshold value, a multiplication circuit for outputting an input level signal of 12 bits, an addition circuit, a register for holding a pad multiplication value corresponding to a reception circuit, another multiplication circuit for multiplying the input level value by the pad multiplication value to output a output level signal for outputting sound by a predetermined sound level, and a comparison region discrimination circuit, a subtraction circuit, a division circuit and a register for regenerating an 8-bit digital signal from the output level signal.