Audio decompression system employing multi-rate signal analysis

Details Audio decompression system employing multi-rate signal analysis Audio decompression system employing multi-rate signal analysis

1994-09-16

1997-02-25

MacDonald, Allen R.

G10L 704

Patent

active

056066422

ABSTRACT:
An audio decompression system is disclosed. The corresponding compression system utilizes sub-band analysis filters whose bandwidths are chosen to approximate the critical bands of the human auditory system while avoiding the aliasing problems encountered in QMF filter banks designed to provide similar band splitting. One embodiment of the invention may be implemented on a digital computer. The computational requirements of the synthesis filters may be varied in response to the available computational resources of the computer, thereby allowing a single compressed audio signal to be played back in real time on a variety of platforms by trading off audio quality against available computational resources. Similar trade offs can be made in compressing an audio signal, thereby allowing a platform having limited computational capacity to compress a signal in real time.

REFERENCES:
patent: 4216354 (1980-05-01), Esteban et al.
patent: 4852179 (1989-07-01), Fette
patent: 4882754 (1989-11-01), Weaver et al.
patent: 4896356 (1990-01-01), Millar

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