Night-day-night sleep-wakefulness monitoring by ambulatory integrated circuit memories

Mitsuaki Yamamoto, Mitsuyuki Nakao, Norihiro Katayama, Mituru Waku, Ken Suzuki, Kazutaka Irokawa, Masato Abe, Takashi Ueno

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A medium-sized portable digital recorder with fully integrated circuit (IC) memories for sleep monitoring has been developed. It has five amplifiers for EEG, EMG, EOG, ECG, and a signal of body acceleration or respiration sound, four event markers, an 8 ch A/D converter, a digital signal processor (DSP), 192 Mbytes IC flash memories, and batteries. The whole system weighs 1200 g including batteries and is put into a small bag worn on the subject's waist or carried in their hand. The sampling rate for each input channel is programmable through the DSE. This apparatus is valuable for continuously monitoring the states of sleep-wakefulness over 24 h, making a night-day- night recording possible in a hospital, home, or car.

Original languageEnglish
Pages (from-to)171-173
Number of pages3
JournalPsychiatry and Clinical Neurosciences
Issue number2
Publication statusPublished - 1999 Apr


  • Flash memory
  • Home monitoring
  • Portable digital monitoring
  • Sleep- wakefulness monitoring


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