G - Physics – 06 – T
Patent
G - Physics
06
T
G06T 9/00 (2006.01) G10L 19/08 (2006.01) G10L 19/12 (2006.01) G10L 19/14 (2006.01) G10L 19/00 (2006.01) G10L 9/16 (1990.01)
Patent
CA 2091754
In a Code Excited Linear Prediction (CELP) analogue signal coding system sequences from a master codebook (40), which may be a one dimensional codebook, are filtered (42) and then stored in slave codebooks (70, 72). Input analogue signals (20) are filtered (34, 36) and compared orthogonally (66, 78, 80) with sequences from the slave codebooks and an optimum pair of se- quences are selected. Since the comparisons are orthogonal, sequences can be selected from the codebooks (70, 72) and compared (78, 80) with the filtered incoming analogue signals entirely independently. Reduced length sequences from the master codebook may be compared with orthogonalised analogue signals since orthogonalised signals contain some redundancy. The master code- book may not need to be orthogonalised in some circumstances. Various means of orthogonalisation of the sequences are possible including separation into odd and even sequences. Further orthogonalisations are possible, for example to give four comparisons.
Elliot Patrick W.
Moulsley Timothy J.
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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