Artículos

Real–Time MCLT Audio Watermarking and Comparison of Several Whitening Methods in Receptor Side

Marcado de Agua de Señales de Audio en Tiempo Real Usando MCLT y la Comparación de Varios Métodos para Decorrelacionar la Señal en el Receptor

José García Hernández, Mariko Nakano Miyatake and Héctor Pérez Meana

Escuela Superior de Ingeniería Mecánica y Eléctrica Unidad Culhuacán Instituto Politécnico Nacional, Av. Santa Ana 1000, 04430 México D.F.
e–mail: hmpm@prodigy.net.mx ; mariko@calmecac.esimecu.ipn.mx

Article received on September 20, 2006; accepted on September 27, 2007

Abstract

A Real–Time audio watermarking scheme is proposed, where the strength of audio signal modifications is limited by the requirement of producing an output audio signal that is perceptually equal to the original one. The watermark embedding stage, based on a spread spectrum algorithm operating in the Modulated Complex Lapped Transform (MCLT) domain, inserts a watermark that is generated using a private key which modeled according to the Human Auditory System (HAS). The proposed blind detection approach is based on the Additive White Gaussian Noise (AWGN) channel theory; and to achieve this goal several whitening methods in the receptor side were evaluated. Evaluation results show that the proposed watermarking embedding scheme is robust to common attacks such like, D/A and A/D conversion, filtering, additive noise and high quality MPEG audio coding.

Keywords: Audio watermarking, copyright protection, Modulated Complex Lapped Transform, DSP implementation, whitening methods.

Resumen

Se propone un esquema para marcado de agua en tiempo real, donde la modificación introducida a las señales de audio esta limitada por la necesidad de producir una señal de salida que sea perceptualmente igual a la salida original. El sistema propuesto usa una detección a ciegas. Para llevar acabo la inserción se emplea un esquema de dispersión del espectro basado en la transformada MCLT. Aquí la marca de agua se genera usando una llave privada y modelado de acuerdo al sistema auditivo humano. Se lleva a cabo además una comparación de diversos métodos que pueden ser empleados para decorrelacionar la señal marcada en el receptor. La marca de agua insertada es robusta contra ataques comunes tales como: conversión A/D y D/A, filtrado, adición de ruido y codificación MPEG entre otros.

Palabras clave: Marcado de agua para señales de audio, protección de derecho de autor, Transformada MCLT, realización en DSP, métodos para decorrelacionar.

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