Title :
Advances in low bitrate time-frequency coding
Author :
Vaillancourt, Tommy ; Malenovsky, Vladimir ; Salami, Redwan ; Zexin Liu ; Lei Miao ; Gibbs, Jon ; Jelinek, Milan
Author_Institution :
VoiceAge Corp., Montreal, QC, Canada
Abstract :
In this paper a novel technique is presented to efficiently mix traditional ACELP time domain coding with a frequency domain coding model to improve the quality of generic audio signals coded at low bitrates without additional delay. The paper discusses how to integrate parts of a traditional Algebraic Code Excited Linear Prediction (ACELP) speech codec to create a time-domain contribution which coexists with a frequency based coding model. A mechanism to determine the value of the time-domain contribution is proposed and a method is described how the frequency-domain contribution might be added without increasing the overall delay of the codec. The proposed method forms part of the recently standardised 3GPP EVS codec.
Keywords :
audio coding; speech codecs; speech coding; 3GPP EVS codec; ACELP time domain coding; algebraic code excited linear prediction speech codec; generic audio signals; low bitrate time-frequency coding; Bit rate; Codecs; Frequency-domain analysis; Speech; Speech coding; Time-domain analysis; ACELP; low bitrate; music coding; speech coding;
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2015 IEEE International Conference on
Conference_Location :
South Brisbane, QLD
DOI :
10.1109/ICASSP.2015.7179106