Time-scale modification of data-compressed audio information

Details Time-scale modification of data-compressed audio information Time-scale modification of data-compressed audio information

2006-11-28

2006-11-28

Chawan, Vijay (Department: 2626)

Data processing: speech signal processing, linguistics, language

Audio signal time compression or expansion

C704S500000, C704S211000, C704S200100

Reexamination Certificate

active

07143047

ABSTRACT:
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.

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