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M. Yashiro, M. Iwaide, A. Yasuda, M. Yoshino, K. Yokota, Y. Moriyasu, K. Sakuda, and F. Nakashima, "A Digitally Driven Speaker System Using Direct Digital Spread Spectrum Technology to Reduce EMI Noise," Paper 8726, (2012 October.). doi: M. Yashiro, M. Iwaide, A. Yasuda, M. Yoshino, K. Yokota, Y. Moriyasu, K. Sakuda, and F. Nakashima, "A Digitally Driven Speaker System Using Direct Digital Spread Spectrum Technology to Reduce EMI Noise," Paper 8726, (2012 October.). doi:
Abstract: In this paper a novel digital direct-driven speaker for reducing electromagnetic interference incorporating a spread spectrum clock generator is proposed. The driving signal of a loudspeaker, which has a large spectrum at specific frequency, interferes with nearby equipment because the driving signal emits electromagnetic waves. The proposed method changes two clock frequencies according to the clock selection signal generated by a pseudo-noise circuit. The noise performance deterioration caused by the clock frequency switching can be reduced by the proposed modified delta-sigma modulator, which changes coefficients of the DSM according to the width of the clock period. The proposed method can reduce out-of-band noise by 10 dB compared to the conventional method.

@article{yashiro2012a,
author={yashiro, masayuki and iwaide, mitsuhiro and yasuda, akira and yoshino, michitaka and yokota, kazuyki and moriyasu, yugo and sakuda, kenji and nakashima, fumiaki},
journal={journal of the audio engineering society},
title={a digitally driven speaker system using direct digital spread spectrum technology to reduce emi noise},
year={2012},
volume={},
number={},
pages={},
doi={},
month={october},} @article{yashiro2012a,
author={yashiro, masayuki and iwaide, mitsuhiro and yasuda, akira and yoshino, michitaka and yokota, kazuyki and moriyasu, yugo and sakuda, kenji and nakashima, fumiaki},
journal={journal of the audio engineering society},
title={a digitally driven speaker system using direct digital spread spectrum technology to reduce emi noise},
year={2012},
volume={},
number={},
pages={},
doi={},
month={october},
abstract={in this paper a novel digital direct-driven speaker for reducing electromagnetic interference incorporating a spread spectrum clock generator is proposed. the driving signal of a loudspeaker, which has a large spectrum at specific frequency, interferes with nearby equipment because the driving signal emits electromagnetic waves. the proposed method changes two clock frequencies according to the clock selection signal generated by a pseudo-noise circuit. the noise performance deterioration caused by the clock frequency switching can be reduced by the proposed modified delta-sigma modulator, which changes coefficients of the dsm according to the width of the clock period. the proposed method can reduce out-of-band noise by 10 db compared to the conventional method.},}

TY - paper
TI - A Digitally Driven Speaker System Using Direct Digital Spread Spectrum Technology to Reduce EMI Noise
SP - EP -
AU - Yashiro, Masayuki
AU - Iwaide, Mitsuhiro
AU - Yasuda, Akira
AU - Yoshino, Michitaka
AU - Yokota, Kazuyki
AU - Moriyasu, Yugo
AU - Sakuda, Kenji
AU - Nakashima, Fumiaki
PY - 2012
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - October 2012 TY - paper
TI - A Digitally Driven Speaker System Using Direct Digital Spread Spectrum Technology to Reduce EMI Noise
SP - EP -
AU - Yashiro, Masayuki
AU - Iwaide, Mitsuhiro
AU - Yasuda, Akira
AU - Yoshino, Michitaka
AU - Yokota, Kazuyki
AU - Moriyasu, Yugo
AU - Sakuda, Kenji
AU - Nakashima, Fumiaki
PY - 2012
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - October 2012
AB - In this paper a novel digital direct-driven speaker for reducing electromagnetic interference incorporating a spread spectrum clock generator is proposed. The driving signal of a loudspeaker, which has a large spectrum at specific frequency, interferes with nearby equipment because the driving signal emits electromagnetic waves. The proposed method changes two clock frequencies according to the clock selection signal generated by a pseudo-noise circuit. The noise performance deterioration caused by the clock frequency switching can be reduced by the proposed modified delta-sigma modulator, which changes coefficients of the DSM according to the width of the clock period. The proposed method can reduce out-of-band noise by 10 dB compared to the conventional method.