Title:
音声信号の量子化ノイズをマスクするためのシステムと方法
Document Type and Number:
Japanese Patent JP4864201
Kind Code:
B2
Abstract:
A system and method for processing an audio signal and including a scalable audio coder (300) and a decoder. The coder (300) includes a multi-resolution transform processor (310), such as a modulated lapped transform (MLT) transform processor, a weighting processor (312), a uniform quantizer (314), a masking threshold spectrum processor (316), an entropy encoder (318), and a communication device (320), such as a multiplexor (MUX) for multiplexing (combining) signals received from the above components for transmission over a single medium. The coder (300) encodes the audio signal by resolution switching, spectral weighting and digital encoding the audio signal. Also, parametric modeling of the digitally encoded signal is performed to enhance encoding. The decoder comprises inverse components of the coder (300) for decoding the encoded audio signal.
Inventors:
Malber, Henrik S.
Application Number:
JP2000551492A
Publication Date:
February 01, 2012
Filing Date:
May 27, 1999
Export Citation:
Assignee:
MICROSOFT CORPORATION
International Classes:
H03M7/42; H04B1/66; H04B14/04; H04L12/20; H04L25/03; H04M3/56
Domestic Patent References:
| JPH09230897A | 1997-09-05 | |||
| JPH07261797A | 1995-10-13 | |||
| JP2001502073A | 2001-02-13 | |||
| JPH0836399A | 1996-02-06 |
Foreign References:
| WO1998015945A1 | 1998-04-16 |
Attorney, Agent or Firm:
Patent Business Corporation Tani/Abe Patent Office
Atsuhiro Hamanaka
Hirokazu Fujiwara
Atsuhiro Hamanaka
Hirokazu Fujiwara