Information Hiding in Speech Signals for Secure Communication

Chapter 5

The G.728-Based Speech Information Hiding Approach

Abstract

G.728 is an ITU-T standard for speech coding using low-delay code excited linear prediction (LD-CELP). This chapter focuses on speech information hiding based on the G.728 scheme and proposes a novel approach for embedding 2.4 kbps MELP-coded secret speech information into 16 kbps G.728 for realizing G.728-based real-time secure communication. This approach adopts the LPC-IH-FS and BD-IE-MES algorithms to embed and extract secret speech information in the G.728 scheme. Experimental results show that this approach meets the requirements of information hiding, satisfies the constraints of speech quality for secure communication, and achieves high hiding capacity of 1.6 ...