Low Bit-Rate Speech Codec Based on a Long-Term Harmonic Plus Noise Model

Ben Ali F, Djaziri-Larbi S, Girin L. Low Bit-Rate Speech Codec Based on a Long-Term Harmonic Plus Noise Model. J Audio Eng Soc. 2016;64(11):844-857. doi:10.17743/jaes.2016.0028

@article{BenAli2016_18522,
  author = {Ben Ali, Faten and Djaziri-Larbi, Sonia and Girin, Laurent},
  title = {{Low Bit-Rate Speech Codec Based on a Long-Term Harmonic Plus Noise Model}},
  journal = {Journal of the Audio Engineering Society},
  volume = {64},
  number = {11},
  pages = {844--857},
  year = {2016},
  month = nov,
  publisher = {Audio Engineering Society},
  doi = {10.17743/jaes.2016.0028},
  url = {https://doi.org/10.17743/jaes.2016.0028}
}

TY  - JOUR
TI  - Low Bit-Rate Speech Codec Based on a Long-Term Harmonic Plus Noise Model
AU  - Ben Ali, Faten
AU  - Djaziri-Larbi, Sonia
AU  - Girin, Laurent
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 64
IS  - 11
SP  - 844
EP  - 857
PY  - 2016
DA  - 2016/11/06
DO  - 10.17743/jaes.2016.0028
UR  - https://doi.org/10.17743/jaes.2016.0028
PB  - Audio Engineering Society
LA  - en
AB  - In speech/music coders and analysis/synthesis systems, spectral modeling is generally performed on a short-term (ST) frame-by-frame basis, which is justified by the fact that the signal is only locally (quasi-) stationary. The vocal tract configuration moves slowly and smoothly thereby resulting in a high correlation between the spectral parameters of successive frames: this correlation property is exploited in long-term modeling of the ST parameters, which however results in longer modeling/coding delays. The short delay constraint can be relaxed in many applications, such as text-to-speech modification/synthesis, telephony surveillance data, digital answering machines, electronic voicemail, digital voice logging, electronic toys, and video games. The long-term harmonic plus noise model (LT-HNM) for speech shows additional data compression possibilities since it exploits the smooth evolution of the time trajectories of the short-term harmonic plus noise model parameters by applying a discrete cosine model (DCM). In this paper, the authors extend the LT-HNM to a complete low bit-rate speech coder that is based on a long-term approach ca. 200ms. The proposed LT-HNM coder reaches a bit-rate of 2.7kbps for wideband speech.
ER  -