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In harsh channel conditions, the quality of the synthetic speech at low bit rate would be affected severely. In order to improve the robustness of the vocoder and make it more resilient to errors in random channel, unequal error protection (UEP) channel coding is usually adopted. However, when the errors cannot be corrected in some cases, UEP channel coding will not improve the quality of the synthetic...
To obtain high quality synthetic speech at 2400 bps, this paper presents a vocoder based on the Mixed Excitation Linear Prediction (MELP) model. The differences of the vocoder parameters are analyzed, and an unequal error protection channel coding and a parameter substitution method for error frame are proposed to improve the robustness over random error channel. Several channel coding schemes are...
Code phase shift keying (CPSK) is an efficient M-ary modulation that can be applied to spread spectrum (SS) based watermarking to improve the watermark payload. However, the host media acts as interference that degrades the watermark robustness, especially in high-payload applications. In this paper, an informed embedding method for CPSK-based watermarking is proposed. The host is utilized at the...
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