Title :
Coding of natural audio in MPEG-4
Author :
Quackenbush, Schuyler R.
Author_Institution :
AT&T Labs., Florham Park, NJ, USA
Abstract :
MPEG-4 standardizes natural audio coding at bit rates ranging from 2 kbit/s, suitable for intelligible speech coding, to 64 kbit/s per channel, suitable for high-quality audio coding. Within this range, three categories of coding are defined: parametric coding, code excited linear predictive coding (CELP) and time/frequency (T/F) coding. The unique contribution of MPEG-4 audio is that not only does it scale across a wide range of bit rates, but it also scales across a broad set of other parameters, such as sampling rate, bandwidth, voice pitch and complexity. This paper presents an overview of the MPEG-4 natural audio coding framework and each of its component coding techniques
Keywords :
audio coding; code standards; decoding; linear predictive coding; speech coding; 2 to 64 kbit/s; CELP; MPEG-4; bandwidth; code excited linear predictive coding; decoder complexity; high-quality audio coding; intelligible speech coding; natural audio coding; parametric coding; sampling rate; time/frequency coding; voice pitch; Audio coding; Bandwidth; Bit rate; Decoding; Frequency; MPEG 4 Standard; Sampling methods; Scalability; Signal synthesis; Speech coding;
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-4428-6
DOI :
10.1109/ICASSP.1998.679711
