Comparison of a Low Bit Rate Speech Compression Algorithm with the MELP Standard for Fricatives and Stops
Rodrigo C. de Lamare, Abraham Alcaim · Anais do 2002 International Telecommunications Symposium · 2002
In this paper we examine the fricatives and stops encoding of a very low bit rate speech compression algorithm, based on a mixed multiband excitation system.The algorithm incorporates several improvements over previously reported coders.One of them is the use of a specific modelling and synthesis strategy for fricatives and stops at 400 b/s.The codec, which operates at an average rate of 1.2 kb/s, is compared with the North American standard 2.4 kb/s MELP coder for sentences with a large concentration of fricatives and stops sounds.Subjective listening tests indicate that the two codecs are comparable for both types of sounds, although the sound specific scheme operates at 400 b/s, whilst the MELP operates at 2.4 kb/s.