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A. Nishimura, "Device-Specific Distortion Observed in Portable Devices Available for Recording Device Identification," Paper 9955, (2018 May.). doi: A. Nishimura, "Device-Specific Distortion Observed in Portable Devices Available for Recording Device Identification," Paper 9955, (2018 May.). doi:
Abstract: This study addresses device-specific distortion observed in recorded audio, to identify a built-in system-on-a-chip (SoC) in a portable device. A swept sinusoidal signal is emitted from a loudspeaker and is recorded by the portable device used in this study. The three types of distortion observed by spectral analysis of the recorded signals are the folded components at frequencies symmetrical across 4 kHz and 8 kHz of the signal component, non-harmonic and non-subharmonic distortion components whose frequencies are 4 kHz below and multiples of 4 kHz above the signal frequency, and mixed non-subharmonics and folded components in the low-frequency region. They are also observed using the correlation matrix on temporal amplitude variations among frequencies derived from the recorded speech signals.

@article{nishimura2018device-specific,
author={nishimura, akira},
journal={journal of the audio engineering society},
title={device-specific distortion observed in portable devices available for recording device identification},
year={2018},
volume={},
number={},
pages={},
doi={},
month={may},} @article{nishimura2018device-specific,
author={nishimura, akira},
journal={journal of the audio engineering society},
title={device-specific distortion observed in portable devices available for recording device identification},
year={2018},
volume={},
number={},
pages={},
doi={},
month={may},
abstract={this study addresses device-specific distortion observed in recorded audio, to identify a built-in system-on-a-chip (soc) in a portable device. a swept sinusoidal signal is emitted from a loudspeaker and is recorded by the portable device used in this study. the three types of distortion observed by spectral analysis of the recorded signals are the folded components at frequencies symmetrical across 4 khz and 8 khz of the signal component, non-harmonic and non-subharmonic distortion components whose frequencies are 4 khz below and multiples of 4 khz above the signal frequency, and mixed non-subharmonics and folded components in the low-frequency region. they are also observed using the correlation matrix on temporal amplitude variations among frequencies derived from the recorded speech signals.},}

TY - paper
TI - Device-Specific Distortion Observed in Portable Devices Available for Recording Device Identification
SP - EP -
AU - Nishimura, Akira
PY - 2018
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - May 2018 TY - paper
TI - Device-Specific Distortion Observed in Portable Devices Available for Recording Device Identification
SP - EP -
AU - Nishimura, Akira
PY - 2018
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - May 2018
AB - This study addresses device-specific distortion observed in recorded audio, to identify a built-in system-on-a-chip (SoC) in a portable device. A swept sinusoidal signal is emitted from a loudspeaker and is recorded by the portable device used in this study. The three types of distortion observed by spectral analysis of the recorded signals are the folded components at frequencies symmetrical across 4 kHz and 8 kHz of the signal component, non-harmonic and non-subharmonic distortion components whose frequencies are 4 kHz below and multiples of 4 kHz above the signal frequency, and mixed non-subharmonics and folded components in the low-frequency region. They are also observed using the correlation matrix on temporal amplitude variations among frequencies derived from the recorded speech signals.