Coded data generation or conversion – Digital code to digital code converters – To or from code based on probability
Patent
1992-01-07
1993-08-03
DeBoer, Todd E.
Coded data generation or conversion
Digital code to digital code converters
To or from code based on probability
H03M 700
Patent
active
052333493
ABSTRACT:
An analogue signal source (10) is coupled to an analyzer (12) to provide a plurality of parameters on a bus (14). The analyzer also provides a reset signal on a separate line (23) and both the bus (14) and the line (23) are fed to a tree coder (22). The reset signal is applied to the tree coder (22) before each parameter is applied on the bus (14) so that the coder commences from a known position in a coding tree for each parameter. The coded signals are supplied on a bus (24) to a modulator (28) having an output which is coupled to a transmitter (30). A system for recreating analogue signals coded in this way estimates partial values of parameters using the probability that each of the possible encoded sequences resulted in the signal from which the analogue signals are to be recreated. The recreating system may also use the probability of occurrence of each of the possible encoded sequences during the tree coding. This latter probability may be derived from the probability density function of the parameters. The tree coder may optionally be arranged to provide trellis coding, for example, for 8-PSK or 16QAM modulation.
REFERENCES:
patent: 4042927 (1977-08-01), Helms
patent: 4968985 (1990-11-01), Riggle et al.
Deboer Todd E.
Treacy David R.
U.S. Philips Corporation
Young Brian K.
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