Abstract: Present disclosure aims to accelerate computer-implemented function evaluation by accelerating determination of a table index and a fraction required for interpolation when a processor uses lookup table based function approximation to compute a function of a particular input value. Systems and methods proposed herein are based on an insight that, by carefully selecting configuration for a lookup table used for function approximation, it is possible to reduce determination of table index and fraction to simple shifting of bits of an input value. Once table index and fraction are determined according to systems and methods proposed herein, the value of the function for the given input value may be computed as known in the art.

Abstract: Programmable-gain amplifier systems are provided that are particularly suited for reducing degrading audio effects such as zipper noise. In one embodiment, these systems switchably couple an electronic potentiometer between an amplifier's inverting input terminal and interleaved tap points along a resistor that is coupled to the amplifier's output terminal. This arrangement introduces a number of fine gain steps between the gain steps that are realized with adjacent ones of the interleaved tap points to substantially reduce or eliminate zipper noise in a audio system that processes the system's output signal. The interleaved tap points facilitate efficient operation of the potentiometer during gain changes. They also permit the potentiometer to be effectively bypassed between gain changes so that distortion effects are substantially eliminated.

Abstract: Programmable-gain amplifier systems are provided that are particularly suited for reducing degrading audio effects such as zipper noise. In one embodiment, these systems switchably couple an electronic potentiometer between an amplifier's inverting input terminal and interleaved tap points along a resistor that is coupled to the amplifier's output terminal. This arrangement introduces a number of fine gain steps between the gain steps that are realized with adjacent ones of the interleaved tap points to substantially reduce or eliminate zipper noise in a audio system that processes the system's output signal. The interleaved tap points facilitate efficient operation of the potentiometer during gain changes. They also permit the potentiometer to be effectively bypassed between gain changes so that distortion effects are substantially eliminated.