Steganographic Wideband Telephony Using Narrowband Speech Codecs

Author

Vary, Peter ; Geiser, Bernd

Author_Institution

RWTH Aachen Univ., Aachen

fYear

2007

fDate

4-7 Nov. 2007

Firstpage

1475

Lastpage

1479

Abstract

We consider the transmission of wideband speech with a cut-off frequency of f_c = 7 kHz over a standardized digital narrowband communication link (f_c = 3.4 kHz). At the receiver, wideband speech is produced by artificial bandwidth extension (BWE). The BWE algorithms can be realized with or without some low bit rate side information. In this paper, we propose to communicate the side information to the receiver via a steganographic channel within the bitstream of the narrowband codec. Hence, the bitstream format is not altered and the bit rate is not increased. The following codecs are considered: mu-law PCM, ADPCM, CS-ACELP, GSM FR, and GSM EFR.

Keywords

broadband networks; cryptography; data encapsulation; digital communication; speech codecs; speech coding; telephony; voice communication; artificial bandwidth extension algorithm; narrowband speech codec; standardized digital narrowband communication link; steganographic channel; steganographic wideband telephony; wideband speech transmission; Bandwidth; Bit rate; Cutoff frequency; GSM; Internet telephony; Narrowband; Phase change materials; Speech codecs; Steganography; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers, 2007. ACSSC 2007. Conference Record of the Forty-First Asilomar Conference on

Conference_Location

Pacific Grove, CA

ISSN

1058-6393

Print_ISBN

978-1-4244-2109-1

Electronic_ISBN

1058-6393

Type

conf

DOI

10.1109/ACSSC.2007.4487475

Filename

4487475