Signal-processing language and operating system
Signal Processing Language/One (SPL/I) was developed at the Naval Research Laboratory (NRL) as a high-level computer programming language for signal processing. SPL/I is the first high-level language to be designed for real-time signal pro~essing applications and selected for production use in the U.S. military.
SourceIn: Real-time, general purpose, high-speed signal processing systems for underwater research (SACLANTCEN Conference Proceedings CP-25), Part 2, 1979, pp. 23-1 - 23-12.