Adaptive rate control algorithm for low complexity AAC encoding

Details Adaptive rate control algorithm for low complexity AAC encoding Adaptive rate control algorithm for low complexity AAC encoding

2011-01-18

2011-01-18

McFadden, Susan (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

Psychoacoustic

Reexamination Certificate

active

07873510

ABSTRACT:
A system and method for adaptive rate control in audio processing is provided. The process could include receiving uncompressed audio data from an input and generating MDCT spectrum for each frame of the uncompressed audio data using a filterbank. The process could also include estimating masking thresholds for current frame to be encoded based on the MDCT spectrum. The masking thresholds reflect a bit budget for the current frame. The process could also include performing quantization of the current frame based on the masking thresholds. After the quantization of the current frame, the bit budget for next frame is updated for estimating the masking thresholds of the next frame. The process could also include encoding the quantized audio data.

REFERENCES:
patent: 7523039 (2009-04-01), Manu
E. Kurniawati et al., “New Implementation Techniques of an Efficient MPEG Advanced Audio Coder,” 2004 IEEE, pp. 655-665.

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