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. 14, 2012
Filed:
Dec. 23, 2009
Miyuki Shirakawa, Fukuoka, JP;
Masanao Suzuki, Kawasaki, JP;
Yoshiteru Tsuchinaga, Fukuoka, JP;
Takashi Makiuchi, Fukuoka, JP;
Miyuki Shirakawa, Fukuoka, JP;
Masanao Suzuki, Kawasaki, JP;
Yoshiteru Tsuchinaga, Fukuoka, JP;
Takashi Makiuchi, Fukuoka, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An encoding apparatus including an SBR (Spectral Band Replication) encoder creates high-frequency-component encoded data with reduced bits. The encoding apparatus converts an input signal into a frequency-domain spectrum signal, divides the converted spectrum signal into an arbitrary number of segments with respect to a time axis and a frequency axis, calculates a spectrum power of each segment and a feature parameter that represents a feature of the corresponding spectrum power, calculates a masking threshold using the calculated spectrum power of each segment, detects a segment having a spectrum power equal to or less than the calculated masking threshold, corrects the spectrum power of the detected segment, and encodes both the corrected spectrum power and the calculated feature parameter. The correction reduces a difference between quantization values, reducing the number of encoded bits.