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A method is described which allows the rapid development of audio compression/synthesis programs requiring significantly less memory and processing cycles than existing techniques.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
88% of the total text.
Page 1 of 1
Audio Compression Technique Based On Peak-To-Peak Interpolation
A method is described which allows the rapid development of audio
compression/synthesis programs requiring significantly less memory and
processing cycles than existing techniques.
This audio compression technique is based on the recognition of
peaks/valleys in the input audio samples. This is done by comparing amplitudes
of the samples taken three-at-a- time. 'Minor peaks/valleys,' which do not differ
from the surrounding samples by more than a preset 'peak threshold,' are
ignored. The amplitude of each peak/valley and the number of sample points
since the previous peak/valley are saved (as 'compressed' data). Series of
sample points that do not vary in amplitude by more than a preset 'silence
threshold' are recognized as silence and treated differently -- a silence identifier
and the count of silent points that follow are saved.
On the synthesis side, generating audio from the compressed data is very
simple. For any peak/valley record, the number of points indicated will be
interpolated from the previous peak/valley (or silence) to the amplitude value
contained in the current record. For silence records, the indicated number of
points will simply be generated, all with zero amplitude.
The technique is a very simple one compared to existing compression
techniques. It requires very little memory and very few processing cycles and
produces sound of high quality. Observed compression rates for initial...