A data-compressed audio waveform is temporally modified without requiring
complete decompression of the audio signal. Packets of compressed audio
data are first unpacked, to remove scaling that was applied in the
formation of the packets. The unpacked data is then temporally modified,
using one of a number of different approaches. This modification takes
place while the audio information remains in a data-compressed format. New
packets are then assembled from the modified data, to produce a
data-compressed output stream that can be subsequently processed in a
conventional manner to reproduce the desired sound. The assembly of the
new packets employs a technique for inferring an auditory model from the
original packets, to requantize the data in the output packets.
