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:
Apr. 06, 1999
Filed:
Aug. 04, 1995
Hiroyuki Fukuchi, Sagamihara, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
An apparatus for compressing audio data is provided. An audio signal is sampled and divided into divided audio signals in a plurality of frequency bands. A predetermined process is applied to ones respective of the divided audio signals and a characteristic value for each of the divided audio signals is calculated after the predetermined process. An adaptive bit allocation circuit repeatedly allocates a number of bits to each of the divided audio signals based on the characteristic value and a bit rate of the input audio signal. The adaptive bit allocation circuit detects the frequency band containing one of the divided audio signals having a maximum characteristic value within a selected frequency range. A unit number of bits is repeatedly allocated to the one of the divided audio signals and the characteristics value is modified based on the unit number of bits. A counting member counts the number of allocated bits for the one of the divided audio signals. A detection range control member selects the frequency range used in the detection process in accordance with the bit rate of the input audio signal and the number of allocated bits that have been counted.