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基于自适应重迭正交变换的音频信号编码
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作者 韦岗 李向武 《电子科技导报》 1996年第4期30-32,36,共4页
本文提出了一种基于自适应重迭正交变换的音频信号编码算法,讨论了变换系数的量化及自适应比特分配问题。实验结果表明该方法的编码质量优于传统的离散余弦变换,没有分块效应,而计算量则相当。
关键词 信号编码 正交变换 音频信号编码 数字通信
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浅析内蒙古广播电视台高清节目AVS+编码复用传输系统
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作者 谢首垣 莎茹拉 《数字传媒研究》 2024年第9期72-74,共3页
内蒙古广播电视台高清节目AVS+编码复用传输系统包含视音频编码器、音频编码器、复用器、IP智能切换器等设备,是覆盖全数据、全业务、全链路的智能化系统,可提供设备级、业务级的精细化管理,实现设备、业务的中央控制、远程管理和快速配... 内蒙古广播电视台高清节目AVS+编码复用传输系统包含视音频编码器、音频编码器、复用器、IP智能切换器等设备,是覆盖全数据、全业务、全链路的智能化系统,可提供设备级、业务级的精细化管理,实现设备、业务的中央控制、远程管理和快速配置,实现内蒙古汉语卫视高清频道、蒙古语卫视高清频道及9套广播频率卫星播出。 展开更多
关键词 高清频道 音频信号编码 信号传输
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MPEG Layer-3简介
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作者 余智 《中国有线电视》 北大核心 2001年第19期51-56,共6页
关键词 MPEGLayer-3 MP3 音响 音频信号编码
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SCALABLE PERCEPTUAL AUDIO REPRESENTATION WITH AN ADAPTIVE THREE TIME-SCALE SINUSOIDAL SIGNAL MODEL
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作者 Al-Moussawy Raed 《Journal of Electronics(China)》 2004年第3期213-221,共9页
This work is concerned with the development and optimization of a signal model for scalable perceptual audio coding at low bit rates. A complementary two-part signal model consisting of Sines plus Noise (SN) is descri... This work is concerned with the development and optimization of a signal model for scalable perceptual audio coding at low bit rates. A complementary two-part signal model consisting of Sines plus Noise (SN) is described. The paper presents essentially a fundamental enhancement to the sinusoidal modeling component. The enhancement involves an audio signal scheme based on carrying out overlap-add sinusoidal modeling at three successive time scales, large, medium, and small. The sinusoidal modeling is done in an analysis-by-synthesis overlap- add manner across the three scales by using a psychoacoustically weighted matching pursuits. The sinusoidal modeling residual at the first scale is passed to the smaller scales to allow for the modeling of various signal features at appropriate resolutions.This approach greatly helps to correct the pre-echo inherent in the sinusoidal model. This improves the perceptual audio quality upon our previous work of sinusoidal modeling while using tile same number of sinusoids. Tile most obvious application for the SN model is in scalable, high fidelity audio coding and signal modification. 展开更多
关键词 Multiresolution sinusoidal modeling Parametric audio coding Low-rate audio coding Signal modifications
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