Pulse or digital communications – Repeaters – Testing
Patent
1995-03-27
1998-03-10
MacDonald, Allen R.
Pulse or digital communications
Repeaters
Testing
395 21, 395 267, 395 22, 395 215, 395 292, 375240, G10L 302
Patent
active
057271194
ABSTRACT:
Accurate measures of estimated spectral power and phase are derived from two spectral representations of each of one or more input signals generated by single-sideband filter banks including critically-sampled perfect-reconstruction filter banks implemented by generalized forms of Time Domain Aliasing Cancellation transforms. The derived measures of spectral magnitude and phase may be used in various applications including adaptive bit allocation in perceptual coding systems. An efficient implementation of one particular single-sideband critically-sampled filter bank comprises folding and shuffling blocks of real-valued input signal samples into blocks of complex-valued samples, rotating the complex-valued samples in the complex plane, transforming the rotated samples into transform coefficients, and rotating and shuffling the transform coefficients to form the spectral representation.
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Davidson Grant Allen
Vernon Stephen Decker
Dolby Laboratories Licensing Corporation
Gallagher Thomas A.
Lathrop David N.
MacDonald Allen R.
Opsasnick Michael N.
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