Method and system for signal emulation

A method for forming a representation of an effect on a signal, having a number of digital signal levels for conveying information, comprising the steps of:

• obtaining a sample of the signal;
• delaying a first portion of the sample by a first amount of time;
• delaying a second portion of the sample by a second amount of time;
• in response to receiving at least one signal processing parameter, scaling the delayed first portion of the sample via a first scaling factor and scaling the delayed second portion of the sample via a second scaling factor;
• providing the representation of the effect in response to combining the scaled and delayed first portion of the sample with the scaled and delayed second portion of the sample;
• in response to a first change in the signal processing parameter, coordinately increasing the first scaling factor and decreasing the second scaling factor;
• in response to a second change in the signal processing parameter, coordinately decreasing the first scaling factor and increasing the second scaling factor;
• and
• applying frequency dependent gain to the sample to compensate for roll-off,
• wherein the sample, the first portion of the sample, the second portion of the sample, the scaled and delayed first portion of the sample, the scaled and delayed second portion of the sample, and the provided representation of the effect each has, as a maximum, the number of digital signal levels.

A system for shaping a digital signal, carrying information via modulation between a plurality of discrete signal levels, the system comprising:

• a limiting amplifier, operative to process the digital signal to reinforce the plurality of discrete signal levels;
• and
• a programmable filter, electrically coupled in series with the limiting amplifier, operative to shape the digital signal according to at least one adjustable filtering parameter,
• wherein the programmable filter comprises a plurality of delay elements, each operative to compensate for roll-off via applying frequency-dependent gain to the sampled digital signal.