Title:
【発明の名称】電気的信号コード化のための方法と装置
Document Type and Number:
Japanese Patent JPH03504787
Kind Code:
A
Abstract:
In a method and apparatus for coding high quality digital audio signals, the signal is sampled at repeated intervals and the sample is filtered into a number of sub-bands, preferably four. The signal in each sub-band is coded by means of a linear prediction technique and each sub-band is quantized with a varying number of levels according to its signal variance. This enables the considerable spectral redundancy which occurs in music signals to be exploited, and this advantage is increased as compared with conventional systems as the signal spectrum becomes discontinuous and/or resonant which is a common occurrence with music.
Inventors:
Smith, Stephen Malcolm Frederick
Application Number:
JP50221589A
Publication Date:
October 17, 1991
Filing Date:
February 10, 1989
Export Citation:
Assignee:
Audio Processing Technology Limited
International Classes:
H04B1/66; H04B14/06; H04B14/04; (IPC1-7): H04B14/06
Attorney, Agent or Firm:
Akira Asamura (3 outside)