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:
Aug. 01, 2000
Filed:
Jun. 15, 1998
Fumiaki Nishida, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
Disclosed is an audio encoding apparatus for splitting an audio signal into a plurality of bands, allocating a number of quantization bits to each band and transmitting the audio signal of each band upon quantizing the audio signal by the number of allocated bits. The apparatus includes a bit allocation unit for (1) calculating an MNR for each band, where MNR is the ratio of an audio masking level M to a quantization noise level N, (2) comparing a set MNR with the smallest MNR from among the MNRs of the respective bands, (3) incrementing the number of quantization bits of the band that corresponds to the smallest MNR if the smallest MNR is smaller than the set MNR, and (4) performing allocation control for allocating quantization bits to each band until the smallest MNR becomes equal to or greater than the set MNR. A quantizer quantizes the audio signal of each band by the allocated number of quantization bits, and a bit-rate calculation unit decides a bit rate for transmission of audio data based upon the number of quantization bits allocated to each band.