A MULTI-CHANNEL PREDICTIVE SUBBAND AUDIO CDER USING PSYCHOACOUSTIC ADAPTIVE BIT ALLOCATION IN FREQUENCY, TIME AND OVER THE MULTIPLE CHANNELS

Application 151/DEL/2005 published 2006-11-10, filed 2005-01-24
A subband audio coder (12) employs perfect/non-perfect reconstruction filters (34), predictive/non-predictive subband encoding (72), transient analysis (106), and psycho-acoustic/minimum mean-square-error (mmse) bit allocation (30) over time, frequency and the multiple audio channels to encode/decode a data stream to generate high fidelity reconstructed audio. The audio coder windows (64) the multi-channel audio signal such that the frame size, i.e., number of bytes, is constrained to lie in a desired range, and formats the encoded data so that the individual subframes can be played back as they are received thereby reducing latency. Furthermore, the audio coder processes the baseband portion (0-24kHz) of the audio bandwidth for sampling frequencies of 48kHz and higher with the same encoding/decoding algorithm so that audio coder architecture is future compatible.

Applicant

1)DIGITAL THEATER SYSTEMS, INC.
:31552 VIA COLINAS, # 101 WESTLAKE VILLAGE, CALIFORNIA 91362, USA U.S.A.

Inventor

1)STEPHEN M. SMYTH 2)MICHAEL H. SMYTH 3)WLLIAM PAUL SMITH

International Info

Classification: H04M11/00