Zero-Bit Transmission of Adaptive Pre- and De-emphasis Filters for Speech and Audio Coding

TL;DR

This paper presents a zero-bit self-adaptation method for pre- and de-emphasis filters in speech and audio codecs, enabling efficient coefficient estimation at the receiver without additional transmission.

Contribution

It introduces a novel zero-bit adaptation approach that estimates de-emphasis coefficients at the receiver, eliminating the need for transmitting adaptation information.

Findings

Accurate estimation of de-emphasis coefficients from decoded signals.

Comparable subjective quality improvements to traditional forward adaptation.

Elimination of transmission overhead and filter lag in adaptation.

Abstract

This paper introduces a novel adaptation approach for first-order pre- and de-emphasis filters, an essential tool in many speech and audio codecs to increase coding efficiency and perceived quality. The proposed zero-bit self-adaptation approach differs from classical forward and backward adaptation approaches in that the de-emphasis coefficient is estimated at the receiver, from the decoded pre-emphasized signal. This eliminates the need to transmit information that arises from forward adaptation as well as the signal-filter lag that is inherent in backward adaptation. Evaluation results show that the de-emphasis coefficient can be estimated accurately from the decoded pre-emphasized signal and that the proposed zero-bit self-adaptation approach provides comparable subjective improvement to forward adaptation.