Exploiting time warping in AMR-NB and AMR-WB speech coders
نویسندگان
چکیده
In this paper, a time warping algorithm is implemented and its performance is evaluated in the context of Adaptive MultiRate (AMR) wideband (WB) and narrowband (NB) speech coders. The aim of time warping is to achieve bit savings in transmission of pitch information with no significant quality degradations. In the case of AMR-NB and AMR-WB speech coders, these bit savings are 0.65-1.15 kbit/s depending on the mode. The performance of the modified AMR speech coders is verified by subjective and objective measures in error-free conditions. MOS tests show that only slight, statistically insignificant degradation of speech quality is experienced when time warping is implemented.
منابع مشابه
An Investigation into the Performance Enhancement and Salient Features of AMR-WB Speech Codec Used in GSM Communication
The 3rd Generation Partnership Project (3GPP) along with European Telecommunication Standard Institute (ETSI) recommended new speech coding scheme, called Adaptive Multi Rate (AMR) in 2000 and 2001. The proposed scheme has two variants: AMR-Narrowband (AMR-NB) and AMR-WB (AMRWideband). The speech quality of AMR-WB in GSM systems is remarkably high compared with that of AMR-NB speech codec becau...
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