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作者机构:School of Information Science and Technology Beijing Institute of TechnologyBeijing 100081 China
出 版 物:《Journal of Beijing Institute of Technology》 (北京理工大学学报(英文版))
年 卷 期:2004年第13卷第S1期
页 面:1-6页
核心收录:
主 题:parametric audio coding sinusoidal model: residual noise model Bark band equivalent rectangular band (ERB) split vector quantization (SVQ)
摘 要:A Bark-band residual noise model integrated with the human hearing mechanism is proposed to efficiently complement sinusoidal model in parametric audio coding. The time-varying spectrum of the residual noise is retrieved by Bark-scale piecewise constant magnitude estimates along with random phases. In the proposed noise model, Bark bands information is obtained by short-time FFT method and window overlap-add technique is exploited to remove boundary discontinuities. SVQ is also incorporated into parameter quantization process for the low bit-rate coding demand. Simulation results and informal listening tests show that when the sinusoidal model is combined with the Bark-band noise model, better synthesis audio quality can be achieved compared with the original sinusoidal modeling audio codec.