MONTEREY, Calif. (AP) _ Loren L. Ryder, one of the pioneers of sound technology for motion pictures and the winner of six Academy Awards, has died after a long illness. He was 85.

Ryder, who died Tuesday at Carmel Convalescent Hospital, was head of sound for Paramount films such as ''The Great Victor Herbert,'' ''Northwest Mounted Police,'' ''Double Indemnity,'' ''War of the Worlds,'' ''Rear Window'' and ''The Ten Commandments.''

Ryder joined Paramount in 1928 and was the sound director and chief engineer for the studio from 1936 to 1957.

He received his first Oscar nomination for Paramount's 1937 production of ''Wells Fargo.'' But his first Oscar came in 1938 when he recorded the squeal of a pig and reproduced it backwards, creating what became the sound of an ice avalanche in ''Spawn of the North.''

Ryder's other Oscars, for technical developments, came in 1941, 1945, 1949, 1950 and 1955.

Ryder also received nominations in the Best Sound Category for ''If I Were King'' (1938), ''Skylark'' (1941), ''The Unseen'' (1945), and ''War of the Worlds'' 1953.

During World War II, Gen. George Patton summoned Ryder to Europe and asked him to silence the noise on his tanks during the Battle of the Bulge. The sound man was able to soften the noise to the point that the Germans thought they were hearing trucks, not tanks.

Ryder is survived by his wife, two daughters and two brothers. Memorial services were set for Saturday.