Abstract: An amplifier or other device under test (DUT) may be automatically modeled. A first simulation model of a first device is provided. One or more processors may be used to measure characteristics of the DUT, the characteristics including two or more of equalization, gain, distortion, and compression. The measured characteristics of the DUT are compared with the characteristics of the first simulation model, and corrective data is calculated based on the comparison. The corrective data is used along with the first simulation model to create a corrected model. The corrected model may be used to filter input signals. Where the DUT is an amplifier, sounds produced by an instrument coupled to the one or more processors produce a sound resembling that of the instrument played through the DUT.

Abstract: The specification relates to the processing of a digital input signal. The digital input signal is convolved with a first time slice of an impulse response with a first direct convolution filter. In parallel, the digital input signal is divided into multiple frequency bands, and each of the multiple frequency bands of the digital input signal are convolved with a second time slice of the impulse response using an equal number of direct convolution filters. The outputs of the equal number of direct convolution filters are recombined and a delay compensation is applied to the recombined outputs. An output of the direct convolution filter is summed with the delayed and recombined outputs to form a zero-to-near-zero latency convolution output.