A Performance Evaluation of the MPEG USAC with Variable Core-Band Down-Sampling Ratio

Abstract

This paper deals with the effect of the internal sampling frequency and core band down sampling ratio on the overall performance of the MPEG USAC. Here, the internal sampling frequency is the sampling frequency of a signal actually coded. The core band down sampling ratio is the ratio of the width of the core band over that of the coded band. The performance was measured on 6 different test sound sources by the MUSHRA test with 10 subjects. The experiments showed that 1/3 or 1/4 core band down sampling ratio could yield the better performance than the conventional 1/2 ratio, especially at low rates.Keyword : down-sampling ratio of core band, USAC, internal sampling frequency 및 HE-AAC v2 [5] 에 포함된 기술들을 확장 및 수정 정규논문 (Regular Paper)