Title :
Real-time performance measures of perceptual audio coding
Author :
Pasero, E. ; Montuori, A.
Author_Institution :
Dipt. di Elettronica, Politecnico di Torino, Italy
fDate :
28 June-1 July 2004
Abstract :
The selection of the wavelet packet best basis of a perceptual real-time audio encoder has been a challenging task for researchers. Due to the subjective nature of the auditory masking phenomenon, fully objective performance measures (entropy versus SNR, delay, etc.) are not sufficient for the selection of optimal representations. In our work we present a DSP application by means of which we can measure, for each hybrid wavelet packet basis resulting from a predetermined library of wavelet filters, the bitrate of a perceptually transparent coding of the audio input and the overall filter bank delay. The novelty is that the transparency of the compression is established with a subjective evaluation. The tool user can customize both the filter bank parameters and the psycho-acoustic model parameters by means of a MATLAB® graphical interface and listen in real-time the reconstructed signal. The audio codec runs in real-time on a TI TMS320C6711™ DSK.
Keywords :
acoustic signal processing; audio coding; channel bank filters; codecs; real-time systems; signal reconstruction; wavelet transforms; DSP application; MATLAB graphical interface; TI TMS320C6711 DSK; audio input; auditory masking; digital signal processing; filter bank delay; filter bank parameters; hybrid wavelet packet; perceptual real-time audio encoder; psychoacoustic model parameters; real-time performance measures; signal reconstruction; wavelet filters; wavelet packet selection; Audio coding; Bit rate; Digital signal processing; Entropy; Filter bank; Libraries; Mathematical model; Propagation delay; Psychology; Wavelet packets;
Conference_Titel :
Information Technology: Research and Education, 2004. ITRE 2004. 2nd International Conference on
Print_ISBN :
0-7803-8625-6
DOI :
10.1109/ITRE.2004.1393678