Phyllis Joan Hoyland Conine, 53, who was active in music groups in Washington and who sang "The Star Spangled Banner" at the 1948 Democratic National Convention in Philadelphia, died Sunday at her home in Washington. She has a chronic heart ailment complicated by a stroke.

Mrs. Conine was born in Chicago and grew up there and in Washington. She graduated from McKinley High School and attended Catholic University.

She began a career as a dramatic soprano and moved to New York to study with Romano Romani, who had been the voice coach of Rosa Ponselle. The then Miss Hoyland won the national auditions of the Chamber Music Guild in 1946. She also gave several recitals and appeared with the National Symphony Orchestra in Washington and the Baltimore Symphony in Baltimore.

Her being chosen to sing the National Anthem at the Democratic National Convention that nominated President Harry S. Truman in 1948 followed these earlier appearances.

Following her marriage to O. Ernest Conine Jr., now the senior editorial writer of The Los Angeles Times, she lived in Europe during Mr. Conine's assignments there as a foreign correspondent. Among other places, the couple lived in Moscow and Vienna.

Mrs. Conine returned to Washington in about 1972 to live with her mother, Mrs. Fred A. Hoyland.

Mrs. Conine was a member of the Friday Morning Music Club, the Women's Committee Auxiliary of the National Symphony Orchestra, and the Salvation Army Auxiliary.

In addition to her mother, of Washington, and her husband, of Beverly Hills, Calif., survivors include a brother, Hollis C. Hoyland of Washington.