Title :
On scalability in CELP coding systems
Author :
Taori, R. ; Sluijter, R.J. ; Gerrits, A.J.
Author_Institution :
Philips Res. Lab., Eindhoven, Netherlands
Abstract :
We propose methods to achieve bit-rate and complexity scalability in CELP coders/decoders. These methods can be implemented as plug-ins or add-ons to existing CELP systems. The associated scale factors can be readjusted even during run-time. In particular, using the proposed methods, a wideband (sampling rate 16 kHz) coder/decoder has been developed that is capable of reconstructing good to high quality speech at bit rates ranging from 14 to 24 kbit/s. The possible complexity range of the decoder can amount to a factor of 2 or more, depending on the constitution of the transmitted bitstream. Although the system also incorporates a complexity scalable encoder, it is not discussed in this paper. This system has been submitted to MPEG-4, where it has been incorporated in the MPEG-4 Audio Verification Model
Keywords :
code standards; decoding; linear predictive coding; signal reconstruction; signal sampling; speech codecs; speech coding; speech intelligibility; speech synthesis; telecommunication standards; 14 to 24 kbit/s; 16 kHz; CELP coders/decoders; CELP coding systems; CELP systems; MPEG-4 Audio Verification Model; add-ons; bit-rate scalability; complexity scalability; high quality speech; plug-ins; sampling rate; scale factors; speech reconstruction; speech synthesis; transmitted bitstream; wideband coder/decoder; Bit rate; Computational complexity; Decoding; Degradation; Interpolation; Linear predictive coding; Reflection; Scalability; Speech synthesis; Wideband;
Conference_Titel :
Speech Coding For Telecommunications Proceeding, 1997, 1997 IEEE Workshop on
Conference_Location :
Pocono Manor, PA
Print_ISBN :
0-7803-4073-6
DOI :
10.1109/SCFT.1997.623899
