OFFICI Of (ORATION THIS DOCUMOU HAS BUN RIPRODUCID (RACILY AS RICIIVID FROM IHf

The comprehensibility of materials compressed and then .expanded by means of an electromechanical process was tested with 280 Army inductees divided into groups of high and low mental aptitude. Three short listening selections relating to military activities were subjected to compression and compression-expansion to produce seven versions. Data indicate that expanding previously compressed materials to restore the word rate to normal:may restore the comprehension of the material to very near normal when.the compression/expansion is limited to 40%. Present results substantiate findings that factors limiting the comprehensibility of rapid speech reside more with the inability of the listener to process rapid rates of speech than with the signal distortion produced by the equipment or compression process..(Author) Professional Paper 6-72 iumRROPP.6-72 March 1972 bol.) FtIluniRRO U.S. DIPARIMINI O HfALTH, EDUCAIION & MUM OFFICI Of (ORATION THIS DOCUMOU HAS BUN RIPRODUCID (RACILY AS RICIIVID FROM IHf Pf RSON OR ORGANIZATION ORIGINATING II. POINTS Of Vlf W OR OPINIONS SIAlfD DO NOT NfCESSARITY RIPRISINI OFFICIAL OFFICE OF f DUCATION I POSITION OR POLICY. Mental Aptitude and Comprehension of Time-Compressed and Compressed-Expanded Listening Selections