Feasibility of Audio Information Hiding Using Linear Time Variant IIR Filters Based on Cochlear Delay

抄録

A reported technique for cochlear delay (CD) based audio information hiding achieved imperceptibility in non-blind approaches. However, the phase shift keying (PSK) technique was utilized with a blind method, causing drastically phase changes that imply perceptible information was inserted. This paper presents an investigation on the feasibility of hiding information in the linear time variant (LTV) system. We adapted a CD filter design for the LTV system in the embedding scheme. The detection scheme was conducted using instantaneous chirp-z transformation (CZT). Objective tests for checking the imperceptibility (PEAQ and LSD) and for checking data payload (bit detection rate (BDR)) were conducted to evaluate our method. Our experimental results supported the feasibility of utilizing the CD-based audio information hiding in the LTV system. ln addition, detection regarding both imperceptibility and data payload was better in our method than in the previous blind method.