Information Hiding in Speech Signals for Secure Communication

Chapter 6

The G.729-Based Speech Information Hiding Approach

Abstract

G.729 is an ITU-T standard for speech coding using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP). This chapter focuses on speech information hiding based on the G.729 scheme and proposes a novel approach for embedding 2.4 kbps MELP-coded secret speech information into 8 kbps G.729 for realizing G.729-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 a G.729 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 ...