Adaptive tracking rail audio amplifier

A system for amplifying an audio signal comprising:

• positive and negative power supply rails;
• a power amplifier having an audio signal input, an audio signal output and positive and negative adaptive rails;
• storage capacitors connected in one-to-one correspondence to respective said positive and negative adaptive rails;
• high current charge pump circuits in one-to-one correspondence with respective said capacitors, each said high current charge pump circuit being connected between respective said storage capacitors and said amplifier output and having a charge circuit and a dynamic release circuit connected in one-to-one correspondence between respective said storage capacitors and said amplifier output,
• said charge circuits and dynamic release circuits being co-operable to cause their respective said high current charge pump circuits to charge respective said storage capacitors across both said positive and negative power supply rails when an output signal swing of said power amplifier is below corresponding respective predetermined positive and negative thresholds and to cause power to be released from respective said storage capacitors to dynamically vary voltage levels of respective said positive and negative power supply rails in a direct relation to said output signal swing of said power amplifier.