Method for coding by random acoustic signals and associated transmission method
AssigneeCopsonic
InventorsDavid Alvarez Canizares, Victor Manuel Mendez Fonseca
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Abstract
The invention relates to a method for coding information symbols of an alphabet into random acoustic signals. The coding dictionary is constructed in a heuristic manner by acquiring a set of random signals, by filtering same by way of the equivalent filter of the transmission channel, by selecting subsets of these signals, and, for each subset, by calculating the correlation matrix of the selected signals, the coding dictionary being constituted by the subset for which the correlation matrix most closely resembles a diagonal matrix. The invention also relates to a method for transmitting and receiving information symbols by way of acoustic signals.
Claims13
Method for coding information symbols belonging to an alphabet by means of acoustic signals, wherein:
- (a) a set of random signals is acquired and they are filtered by a filter of interest having for response the response of the transmission channel on which these signals are intended to be transmitted;
- (b) sub-sets of N random signals thereby filtered of said set are selected and, for each sub-set, a correlation matrix of the signals thereby selected is calculated;
- (c) the sub-set of N signals corresponding to the correlation matrix the closest to a diagonal matrix is retained as coding dictionary;
- (d) each information symbol of the alphabet is coded by a random signal of the dictionary, said random signal of the dictionary being transformed into an acoustic signal by a transducer.
Dependencies are inferred from the claim text.