ویراساینس.
سند علمی

Quantization Noise Power Injection In Subband Audio Coding Using Low Selectivity Filter Banks

D. MARTÍNEZ

چکیده

The ISO-MPEG standards are widely used for high quality audio coding. They use perceptual models that require high frequency resolution. This implies two characteristics: they use high selectivity filter bank to decompose the audio signal, and the FFT frame length for the frequency masking threshold calculations is long. Both characteristics carried out a very high delay coding. In applications where the delay is a critical parameter, i.e. when the use of a feedback channel is important, the ISO-MPEG algorithms are not suitable. In this paper we present how to overcome the first handicap: to compatibilize the use of short impulse filter bank response and perceptual model application. These filter banks present low selectivity and so the non-ideal filters frequency responses should be taken into account. Key-Words: Subband audio coding, Noise injection, Filter bank, Psycho-acoustic model

اسناد مشابه

  • Wideband speech and audio coding using gammatone filter banks

    سند علمی۲۰۰۱ICASSPEliathamby Ambikairajah, Julien Epps, Lee Lin

    Considerable research attention has been directed towards speech and audio coding algorithms capable of producing high quality coded speech and audio, however few of these use signal representations which account for temporal as well as spectral detail. This paper presents a new

  • Subband audio coding with synthesis filters minimizing a perceptual distortion

    سند علمی۱۹۹۷ICASSPKarine Gosse, François Moreau de Saint-Martin, Xavier Durot, Pierre Duhamel

    The design of lter banks for source coding purposes classically relies on the perfect reconstruction (PR) property. However, several recent studies have shown that taking the quantization noise into account in the design could yield noticeable reduction of the mean square reconst

  • A Low Delay Filter Bank for Audio Coding with Reduced Pre-echoes

    سند علمی۲۰۰۴Gerald Schuller

    A low delay filter bank for audio coding is presented. The low delay allows to reduce the length of pre-echoes generated by quantization errors. The structure provides perfect reconstruction and a system delay which can be pre-specified independent of the filter length. A robust

  • A low-power asynchronous data-path for a FIR filter bank

    سند علمی۲۰۱۷

    This paper describes a number of design issues relating t o the implementation of low-power asynchronous signal processing circuits. Specifically, the paper addresses the design of a dedicated processor structure that implements a n audio FIR filter bank which is part of a n indu

  • A low-power sixth-order Gm-C low-pass filter usable in audio applications

    مقاله۲۰۲۴Computational Sciences and EngineeringMohsen Ghaemmaghami, Shahbaz Reyhani

    This paper presents a Gm-C tunable sixth-order active low-pass filter designed using an operational transconductance amplifier (OTA) that can be utilized at the front-end of analog to digital converters (ADCs) or to be used in the output of digital to analog converters (DAC). The

  • A low-power asynchronous data-path for a FIR filter bank

    سند علمی۱۹۹۶ASYNCLars Skovby Nielsen, Jens Sparsø