Abstract: The invention provides a micro processor, an input device for entering job costing data and job parameter information, an output device such as a printer to generate contract proposals and/or management reports. A display device is preferably also provided to display the minimum labor rate calculated by a program executed on the microprocessor from the job costing data. Memory is preferably also provided to store at least the minimum labor rate for use in generating management reports.

Abstract: Apparatus and methods are provided for embedding or embedding digital data into an analog host or cover signal. A distributed signal feature of the cover signal in a particular domain (time, frequency or space) is calculated and compared with a set of predefined quantization values corresponding to an information symbol to be encoded. The amount of change required to modify the signal feature to the determined target quantization value is calculated and the cover signal is modified accordingly to so change the feature value over a predefined interval. Information symbols are extracted by the opposite process.