ویراساینس.
سند علمی

Study of the influence of noise pre-processing on the performance of a low bit rate parametric speech coder

Gwénaël Guilmin, Régine Le Bouquin-Jeannès, Philippe Gournay

چکیده

This paper describes a prospective study of the contribution of a single-sensor noise pre-processing method, prior to coding, to the performance of a parametric low bit rate speech coder in adverse conditions. The 2.4kbits/s vocoder we use estimates four parameters: fundamental frequency, voicing, linear prediction coefficients and energy. Firstly, we study the influence of different noise levels on the estimated parameters with and without noise reduction system. Secondly, we measure the contribution of (i) each speech coder parameter and (ii) the speech enhancement system to the global output intelligibility. Finally, results show the interest of such a speech enhancement system for low bit rate parameter estimation and underline the interest to adapt different pre-processing techniques for each parameter estimation.

اسناد مشابه

  • Pseudo-multi-tap pitch filters in a low bit-rate CELP speech coder

    سند علمی۱۹۹۴Speech CommunicationYasheng Qian, Gebrael Chahine, Peter Kabal

    The pitch filter in a low bit-rate CELP speech coder has a strong impact on the quality of the reconstructed speech. In this paper we propose a pseudo-multi-tap pitch filter with fewer degrees of freedom than the number of prediction coefficients, but which gives a higher pitch p

  • A study on the recognition of low bit-rate encoded speech

    سند علمی۱۹۹۸ICSLPAn-Tzyh Yu, Hsiao-Chuan Wang

    Digital speech communications are the future trend in the Internet and mobile phones. The low bit-rate coding of speech signals is the essential requirement in the concern of channel bandwidth and transmission efficiency. The voice-based services will become more attractive to th

  • Very low bit rate parametric audio coding

    سند علمی۲۰۰۸Heiko Purnhagen

    In this thesis, a parametric audio coding system for very low bit rates is presented. It is based on a generalized framework that combines different source models into a hybrid model and thereby permits flexible utilization of a broad range of source and perceptual models. The de

  • Exploring on Steganography for Low Bit Rate Wavelet Based Coder in Image Retrieval System

    سند علمی۲۰۰۰S. Areepongsa, N. Kaewkamnerd, Y. F. Syed, K. R. Rao

    In this paper, the image retrieval system that provides an efficient retrieval, management and transmission of selected image(s) from the database is proposed. The key point of research is utilizing steganographic technique to achieve the efficient use of resources by embedding a

  • Linear prediction of formants for low bit rate digital speech transmission

    سند علمی۱۹۷۹ICASSPSassan Ahmadi, Anthony G. Constantinides

    A new nethod based on linear prediction technique in transform donain is proposed in this paper to achieve low bit rate digital speech trsnsnission. Seperate processing of voiced/unvoiced sections of speech is employed.In the case of voiced sounds the first foment is chosen from

  • Post-Processing for Low Bit-Rate Wavelet-Based Image Coding Using Multiscale Edge Characterization

    سند علمی۱۹۹۸Data Compression ConferenceGuoliang Fan, Wai-kuen Cham

    In this paper, we propose a new postprocessing method for low bit-rate wavelet-based image coding which uses the technique of wavelet modulus maximum representation (WMMR). The edge degradation from wavelet-based coding is discussed under the overcomplete wavelet expansion, and i