A Digitally Driven Speaker System Using Direct Digital Spread Spectrum Technology to Reduce EMI Noise

Yashiro M, Iwaide M, Yasuda A, Yoshino M, Yokota K, Moriyasu Y, Sakuda K, Nakashima F. A Digitally Driven Speaker System Using Direct Digital Spread Spectrum Technology to Reduce EMI Noise. In: AES Convention 133. Audio Engineering Society; 2012. Paper 8726. Available from: https://aes.org/publications/elibrary-page/?id=16468

@inproceedings{Yashiro2012_16468,
  author = {Yashiro, Masayuki and Iwaide, Mitsuhiro and Yasuda, Akira and Yoshino, Michitaka and Yokota, Kazuyki and Moriyasu, Yugo and Sakuda, Kenji and Nakashima, Fumiaki},
  title = {{A Digitally Driven Speaker System Using Direct Digital Spread Spectrum Technology to Reduce EMI Noise}},
  booktitle = {AES Convention 133},
  note = {Paper 8726},
  year = {2012},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=16468}
}

TY  - CPAPER
TI  - A Digitally Driven Speaker System Using Direct Digital Spread Spectrum Technology to Reduce EMI Noise
AU  - Yashiro, Masayuki
AU  - Iwaide, Mitsuhiro
AU  - Yasuda, Akira
AU  - Yoshino, Michitaka
AU  - Yokota, Kazuyki
AU  - Moriyasu, Yugo
AU  - Sakuda, Kenji
AU  - Nakashima, Fumiaki
T2  - AES Convention 133
M1  - Paper 8726
PY  - 2012
DA  - 2012/10/06
UR  - https://aes.org/publications/elibrary-page/?id=16468
PB  - Audio Engineering Society
LA  - en
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.
ER  -