Method and apparatus for pre-conditioning an electrical signal

An electrical circuit for pre-conditioning an electrical signal for supply to an amplifier, the circuit comprising:

• a first iteration section comprising:
• a limiter for limiting an amplitude of the electrical signal to produce a limited signal;
• means for generating a difference signal by subtracting the electrical signal from the limited signal;
• and
• means for generating an output signal by subtracting the difference signal from the limited signal;
• and at least one subsequent iteration section comprising:
• a limiter for limiting the amplitude of the output signal of the previous iteration to produce a subsequent limited signal;
• means for generating a subsequent difference signal by subtracting the electrical signal from the subsequent limited signal;
• and
• means for generating a subsequent output signal by subtracting the subsequent difference signal from the subsequent limited signal.