Title :
Steganographic Wideband Telephony Using Narrowband Speech Codecs
Author :
Vary, Peter ; Geiser, Bernd
Author_Institution :
RWTH Aachen Univ., Aachen
Abstract :
We consider the transmission of wideband speech with a cut-off frequency of fc = 7 kHz over a standardized digital narrowband communication link (fc = 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;
Conference_Titel :
Signals, Systems and Computers, 2007. ACSSC 2007. Conference Record of the Forty-First Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
978-1-4244-2109-1
Electronic_ISBN :
1058-6393
DOI :
10.1109/ACSSC.2007.4487475
