Patent ID: 6272241
Filing Date: 2001-08-07
Classification: G06K,H04B

Abstract:
A pattern recognition apparatus comprising:an input port for receiving a set of input digital signal values representing a pattern of physical occurrences distributed over time or space to be recognized;means for encoding the input digital signal values into coded input signal values to form a digital representation of the received set of input digital signal values;a plurality of addressable digital signal storage memory devices each having at least one address line for addressing locations therein, the address lines being connected to receive bits from said digital representation; andmeans connected to receive digital data signals from said memory devices for producing a composite digital output signal dependent on data signals read from the addressed locations of the memory devices;wherein the means for encoding employs a redundant code having a normalized coded input signal value Hamming distance to normalized input signal value distance relationship with a mean slope greater than 1 for input signal value distances up to a predetermined level of at least 10% of the maximum input signal value distance.