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سند علمی

Improvements to the Switched Parametric & Transform Audio Coder

Scott N. Levine, Julius O. Smith

چکیده

In this paper, we introduce improvements to previous sines + transients + noise audio modeling systems, including new sinusoidal trajectory selection and quantization procedures. In previous work [1], the audio is first segmented into transient and non-transient regions. The transient region is modeled using traditional transform coding techniques, while the non-transient regions are modeled using parametric sines plus noise modeling. Because such a system contains a mix of parametric and non-parametric techniques, compressed-domain processing such as time-scale modifications are possible.

اسناد مشابه

  • A Switched Parametric & Transform Audio Coder

    سند علمی۱۹۹۸Scott N. Levine, Julius O. Smith

    In this paper, we present a system of sines+transients+noise modeling techniques that dynamically switches between parametric representations and transform coding based representations. The sines and noise are represented by parametric models using multiresolution sinusoidal mode

  • Post-processing modifications in a parametric audio coder

    سند علمی۲۰۰۴P. VERA - CANDEAS, N. RUIZ - REYES, P. J. RECHE, J. CURPIÁN - ALONSO

    This paper deals with the modifications of the audio signal in a parametric audio coder at the decoder stage. The parametric audio coder is based on the application of adaptive signal models for each audio signal component. These adaptive signal models are obtained by using diffe

  • A Bit Stream Scalable Speech/Audio Coder Combining Enhanced Regular Pulse Excitation and Parametric Coding

    سند علمی۲۰۰۷EURASIP J. Adv. Sig. Proc.Felip Riera-Palou, Albertus C. den Brinker

    This paper introduces a new audio and speech broadband coding technique based on the combination of a pulse excitation coder and a standardized parametric coder, namely, MPEG-4 high-quality parametric coder. After presenting a series of enhancements to regular pulse excitation (R

  • A progressive to lossless embedded audio coder (PLEAC) with reversible modulated lapped transform

    سند علمی۲۰۰۳ICASSPJin Li

    A progressive to lossless embedded audio coder (PLEAC) has been proposed. PLEAC is based purely on reversible transform, which is designed to mimic the non-reversible transform in a normal psychoacoustic audio coder as much as possible. Coupled with a high performance embedded en

  • A Nearly-transparent Low Delay Audio Coder

    سند علمی۱۹۹۹D. MARTÍNEZ

    Nowadays, it does not exist an audio coding standard for getting nearly-transparent quality with low delay. The standard ISO-MPEG is profusely used in audio for getting high quality [1]. It uses a perceptual model that requires high frequency precision and introduces high delay.

  • High Quality Wavelet-Packet Based Audio Coder with Adaptive Quantization

    سند علمی۱۹۹۷J. F. Luo

    In this paper, we propose an audio coder for high quality low bit-rate applications based on the wavelet-packet transform. The primary goal of the proposed coder will be to combine high quality reconstructed audio with shorter delay than existing methods while keeping the bit rat