Author : Janki Patel 1
Date of Publication :24th January 2018
Abstract: The narrowband frequency range from about 300 Hz to 3.4 kHz. So, the audio quality of telephone network is restricted. Bandwidth extension(BWE) is used to extend narrowband(NB) frequency range to wideband(WB) frequency range which is 50 Hz to 7 kHz and wideband frequency range to super wideband(SWB) frequency range which is 50 Hz to 14 kHz. This bandwidth extension can be realized with or without side information. The Bandwidth extension is performed by adding missing frequencies artificially at the receiver using information contained in narrowband signal or either using some low bit rate side information. The basic principles of bandwidth extension address by this review paper and discuss different methods of bandwidth extension from narrowband to wideband and narrowband to super wideband.
Reference :
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[1] P. Jax and P. Vary, ―On artificial bandwidth extension of telephone speech,‖ Signal Process., vol. 83, no. 8, pp. 1707–1719, 2003.
[2] Chauhan, Tejal, Ninad Bhatt, and Shraddha Singh. "Artificial Bandwidth Extension Method of telephony Speech in Mobile Terminal: A Review."
[3] P. Jax and P. Vary, ―Bandwidth extension of speech signals: A catalyst for the introduction of wideband speech coding?,‖ IEEE Commun.Mag., vol. 44, no. 5, pp. 106–111, 2006.
[4] Peter Jax ―‖Artificial Bandwidth Extension of Speech Signals‖ (IND) Aachen University (RWTH), Germany.
[5] Murali Mohan D, Dileep B. Karpur, Manoj Narayan, Kishore J ―Artificial bandwidth extension of narrowband Speech using Gaussian Mixture Model‖, BNM Institute of Technology,IEEE 2011,pp. 410-412.
[6] P. Jax and P. Vary, ―Wideband extension of telephone speech using a hidden Markov model,‖ in IEEE Speech Coding Worksh., Delavan,WI, USA, Sept. 2000, pp. 133– 135.
[7] P. jax and P.vary ―Artificial bandwidth extension of speech signals Using MMSE estimation based on a hidden markov model‖ Institute of communication systems and data processing (ind), Aachen University (RWTH), 52056 Aachen, Germany,IEEE( ICASSP) 2003.
[8] P. Jax, ―Enhancement of bandlimited speech signals: Algorithms and theoretical bounds‖, Aachen University (RWTH), Aachen, Germany, vol. 15 of P. Vary , 2002.
[9] W. fujitsuruy, H. sekimotoy, ―Bandwidth extension of cellular phone speech based on maximum Likelihood estimation with GMM‖ International Workshop on Nonlinear Circuits and Signal Processing NCSP'08, Gold Coast, Australia, March 6-8, 2008.
[10] J. Makhoul and M. Berouti, ―High-frequency regeneration in speech coding systems,‖ in Proc. IEEE Int. Conf. Acoust., Speech, Signal Process. (ICASSP), 1979, vol. 4, pp. 428–431.
[11] ITU-T Rec. G.722.2, ―Wideband Coding of Speech at around 16 kb/s Using Adaptive Multirate Wideband (AMR-WB),‖ Jan. 2002.
[12]Tammi, Mikko, et al. "Scalable superwideband extension for wideband coding." Acoustics, Speech and Signal Processing, 2009. ICASSP 2009. IEEE International Conference on. IEEE, 2009.
[13] Qian, Y. & Kabal, P. ―Wideband speech recovery from narrowband speech using Classified codebook mapping‖,( mcgill university) Proceedings of the 9th Australian International Conference on Speech Science & Technology Melbourne, December 2 to 5, 2002.
[14]Bhatt Ninad, and Yogeshwar Kosta. "A novel approach for artificial bandwidth extension of speech signals by LPC technique over proposed GSM FR NB coder using high band feature extraction and various extension of excitation methods." International Journal of Speech Technology 18.1 (2015): 57-64.
[15] J. Mäkinen et al., “AMR-WB+: A New Audio Coding Standard for 3rd Generation Mobile Audio Services,” in Proc. ICASSP, Philadelphia, PA, USA, pp. 1109-1112, March 2005.
[16] M. Dietz, L. Liljeryd, K. Kjörling, and O. Kunz, ”Spectral band replication, a novel approach in audio coding,” in Proc. AES 112th Convention, Munich, Germany, Paper 5553, May 2002