Data processing devices, data processing units, methods and computer programs for processing telemetry data

A data processing unit for processing telemetry data, the data processing unit being configured to:

• receive data comprising an encoded set of data elements from a remote data processing device, a data element in the encoded set of data elements being indicative of a measure of a change between a sampled value in a first set of sampled values and a corresponding sampled value in a second set of sampled values, a position of a given data element in the set of data elements having been determined based on at least one dynamic mapping rule, the first set of sampled values being associated with a first sampling time and the second set of sampled values being associated with a second, subsequent sampling time, the first and second sets of sampled values having been generated using sampled data, the sampled data being based on output data sampled from at least one first sensor of a plurality of sensors associated with a vehicle and output data from at least one second sensor of the plurality of sensors, the output data from the at least first sensor having been sampled at a first sampling rate and the output data from the at least one second sensor having been sampled at a second, higher sampling rate, wherein a position of a given sample in the first set and a position of a given sample in the second set are based on the at least one dynamic mapping rule;
• decode the encoded set of data elements;
• and
• use at least the decoded set of data elements to recover the second set of sampled values.