Technique for correcting helium speech distortion.

Some qualitative data on the nature of the speech distortion caused by respiration of a helium‐oxygen atmosphere are presented. Previous corrective‐processing techniques are discussed, and an advanced technique that overcomes their disadvantages described. The experimental system is based upon time‐domain speech‐processing methods and is capable of retaining the natural pitch rate of the speaker's voice while correcting the formant shifts caused by the helium‐rich atmosphere. This system uses digital‐processing methods and is capable of operating on continuous speech in on‐line applications. It promises a practical solution to the problem of providing normal voice communication in a helium environment.