TEMPORAL ENVELOPE CORRECTION FOR ATTACK RESTORATION IN LOW BIT-RATE AUDIO CODING

Imen Samaali (1, 2) , Monia Turki-Hadj Alouane (3) , Gaël Mahé (2)

1 U2S - Unité Signaux et Systèmes
2 CRIP5 - EA 2517 - Centre de Recherche en Informatique de Paris 5
3 UR-U2S-ENIT - Unité de recherche Signaux et Systèmes [Tunis]

At reduced bit rates, the audio compression affects transient parts of signals, which results in pre-echo and loss of attack character. We propose in this paper an attacks restoration method based on the correction of the temporal envelope of the decoded signal, using a small set of coefficients transmitted through an auxiliary channel. The proposed approach is evaluated for single and multiple coding-decoding, using objective perceptual measures. The experimental results for MP3 and AAC coding exhibits an efficient restoration of the attacks and a significant improvement of the audio quality.

Mots clés: audio compression; pre-echo phenomenon; attack restoration; temporal envelope.; temporal envelope

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Imen Samaali, Monia Turki-Hadj Alouane, Gaël Mahé. TEMPORAL ENVELOPE CORRECTION FOR ATTACK RESTORATION IN LOW BIT-RATE AUDIO CODING. European Signal Processing Conference, Aug 2009, glasgow, European Union. ⟨hal-00686309⟩