It gets the incidental background noise characteristics of the sample audio by wavelet de-noising,and compares it with the background noise of other audio to detect whether it is tampered by another piece of audio recorded by another type of device,which provides the evidence for judicial authentication.

The general model of the effect of substrate noise on analog circuits in mixed-signal integrated circuits is set up in this paper.

This model can characterize the substrate noise in the mixed signal ICs accurately.

The transmission of the substrate noise in mixed-signal integrated circuits is introduced in this paper briefly.

This paper adopts the spectrum averaging method to analyze the effects of clock jitter and the additive white noise to the noise floor of ADC blocks,and derives the noise floor formula,which is validated by computer simulation.

Substrate crosstalk in the mixed signal IC and its effect on the analog/digital circuits are investigated based on PSPICE simulator and using two external programs written by the authors in C language.

In this paper, a complex mixed-signal circuit-monolithic digital phase-locked loop along with its substrate crosstalk models is built and simulated using PSPICE and two external programs written in C Languadge.