Efficient handling of mode switching and speech transitions in the EVS codec

Vaclav Eksler; Milan Jelinek; Redwan Salami

ICASSP 2015accepted0 citations

Efficient handling of mode switching and speech transitions in the EVS codec

Vaclav Eksler, Milan Jelinek, Redwan Salami

Abstract

The recently standardized codec for Enhanced Voice Services (EVS) consists of a number of modes to achieve its high coding flexibility. In this paper we focus on techniques that enable a seamless switching between two linear prediction based modes running at different sampling rates within this codec. The first one deals with an efficient conversion of the linear prediction filter coefficients. The other one is based on a constrained-memory ACELP called transition coding (TC) that significantly limits the inter-frame long-term dependency. We show that the use of TC can be successfully extended to improve quality also in coding other transitions, e.g. strong onsets of voiced speech.

BibTeX

@inproceedings{icassp2015_efficienthandlin,
  title = {Efficient handling of mode switching and speech transitions in the EVS codec},
  author = {Vaclav Eksler and Milan Jelinek and Redwan Salami},
  booktitle = {ICASSP 2015},
  year = {2015}
}