Data pulse spectrum control

A waveform synthesizer that generates an angularly modulated signal that conveys information from a wireless instrument and that reduces interference with another signal from another wireless instrument, the waveform synthesizer comprising:

• a logic module configured to generate a signal corresponding to a predetermined frequency during a symbol interval, the symbol interval divided into an information transmission time for providing information signals at one of two designated frequencies and a transition time for providing at least one transition signal having a frequency intermediate to the two designated frequencies;
• an adder module for receiving the signal corresponding to the predetermined frequency from the logic module at a first adder input, the adder having an output for providing an accumulator change signal;
• an accumulator module configured to receive the accumulator change signal from the output of the adder module and to maintain an accumulator value each clock cycle, the accumulator module having an output for providing the maintained accumulator value to a second input of the adder for adding the maintained accumulator value to the information signals and the signal corresponding to the predetermined frequency received from the logic module;
• and
• a digital waveform converter connected to the output of the accumulator module and configured to receive only the maintained accumulator value provided at the output of the accumulator module for generating a digital waveform comprising the information signals at one of two designated frequencies during information transmission times and at least one intermediate frequency during transition times to control channel interference.