Invertibility of a room impulse response

Stephen T. Neely, Jont B. Allen

Research output: Contribution to journalArticlepeer-review

268 Scopus citations


When a conversation takes place inside a room, the acoustic speech signal is linearly distorted by wall reflections. The rooms effect on this signal can be characterized by a room impulse response. If the impulse response happens to be minimum phase, it can easily be inverted. Synthetic room impulse responses were generated using a point image method to solve for wall reflections. A Nyquist plot was used to determine whether a given impulse response was minimum phase. Certain synthetic room impulse responses were found to be minimum phase when the initial delay was removed. For these cases a mimimum phase inverse filter was sucessfully used to remove the effect of a room impulse response on a speech signal.

Original languageEnglish (US)
Pages (from-to)165-169
Number of pages5
JournalJournal of the Acoustical Society of America
Issue number1
StatePublished - Jul 1979
Externally publishedYes

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics


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