DocumentCode :
2282852
Title :
A high-fidelity speech and audio codec with low delay and low complexity
Author :
Chen, Juin-Hwey
Author_Institution :
Speech Technol. Group, Lucent InterNetworking Syst., Red Bank, NJ, USA
Volume :
2
fYear :
2000
fDate :
2000
Abstract :
This paper presents a high-fidelity speech and audio codec operating at a sampling rate of 32 kHz and a bit rate of 64 kbit/s. Designed primarily for real-time speech communication systems with high port densities, this MDCT-based transform codec has a very low coding delay (8 ms frame size) and low codec complexity (less than 10 MIPS on a 16-bit fixed-point DSP). The codec achieves essentially transparent quality for speech, and very close to transparent quality for music. A novel frame erasure concealment algorithm makes this codec robust to frame erasures for both speech and music. Another novel feature allows the decoder to decode the bit stream directly into a 16 kHz or 8 kHz sampled signal, without the need to decode a 32 kHz signal first and then down-sample it to the target sampling rate. Other novel features include some speed-memory trade-off techniques to reduce the computational complexity
Keywords :
audio coding; computational complexity; discrete cosine transforms; speech codecs; speech coding; transform coding; 32 kHz; 64 kbit/s; MDCT-based transform codec; audio codec; computational complexity; decoder; frame erasure concealment algorithm; high-fidelity codec; low coding delay; low complexity; music; real-time speech communication; sampling rate; speech codec; speed-memory trade-off techniques; transparent quality; Bit rate; Computational complexity; Decoding; Delay; Digital signal processing; Oral communication; Real time systems; Robustness; Sampling methods; Speech codecs;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference on
Conference_Location :
Istanbul
ISSN :
1520-6149
Print_ISBN :
0-7803-6293-4
Type :
conf
DOI :
10.1109/ICASSP.2000.859171
Filename :
859171
Link To Document :
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