Wikipedia:
bandwidth extension
Bandwidth extension of signal is defined as the deliberate
process of expanding the frequency range (bandwidth) of a signal in which it contains an
appreciable and useful content, and/or the frequency range in which its effects are such. Its significant advancement in recent
years has led to the technology being adopted commercially in several areas including psychacoustic bass enhancement of small loudspeakers and the high
frequency enhancement of perceptually coded audio.
References
- R.M. Aarts, Erik Larsen and O. Ouweltjes (2003), A unified approach to low- and high-frequency bandwidth extension, Convention Paper 5921 Presented at the AES 115th Convention 2003, Oct. 10--13, New York, USA
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