Effective deployment of temporal noise shaping (TNS) filters

Details Effective deployment of temporal noise shaping (TNS) filters Effective deployment of temporal noise shaping (TNS) filters

2006-07-13

2010-02-16

Kuntz, Curtis (Department: 2614)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Digital audio data processing system

C704S205000, C704S500000, C381S094300, C708S322000

Reexamination Certificate

active

07664559

ABSTRACT:
The MPEG2 Advanced Audio Coder (AAC) standard limits the number of filters used to either one filter for a “short” block or three filters for a “long” block. In cases where the need for additional filters is present but the limit of permissible filters has been reached, the remaining frequency spectra are simply not covered by TNS. Two solutions are proposed to deploy TNS filters in order to get the entire spectrum of the signal into TNS. The first method involves a filter bridging technique and complies with the current AAC standard. The second method involves a filter clustering technique. Although the second method is both more efficient and accurate in capturing the temporal structure of the time signal, it is not AAC standard compliant. Thus, a new syntax for packing filter information derived using the second method for transmission to a receiver is also outlined.

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