Patent ID: 7400194
Filing Date: 2008-07-15
Classification: H03F

Abstract:
1. A method of amplifying a digital signal, comprising the steps of: a) receiving a digital signal; b) generating a pseudo-random number, the pseudo-random number generated every clock cycle of a variable clock, wherein the frequency of the variable clock is varied in accordance with the average amplitude of the received digital signal; c) comparing the received digital signal with the pseudo-random number; d) if the digital signal is at least equal to the pseudo-random number, switching an amplifier on, otherwise switching the amplifier off; e) filtering the output of the amplifier; f) transmitting the filtered output to a transducer; and g) if the amplitude of the received digital signal is close to zero for a predefined period of time, turning the amplifier off using a control signal input to the amplifier.