README.md
DECUS 11-296 L. Robert Morris
Carleton University
Ottawa, Canada
&
Digital Equipment Corporation
Maynard, MA
Fast Digital Signal Processing Software Package
for the PDP-11.
This software package consists of a number of digital
signal processing programs optimized for maximum
speed on PDP-11 computers. Initial components
are radix 2 fixed-point FFT, radix 4 floating-point
FFT, fixed-point autocorrelation, and floating-point
autocorrelation matrix solution. The latter two programs
are useful in linear predicitve speech coding. All
fixed-point programs require the EIS instruction set
(LSI-11, 11/34,40,45,55,70) and all floating-point programs
require the FPP instruction set (11/34,45,55,70 with FFP).
11/55 (bipolar) benchmarks are: 1024 point real FFT, 62msec
(fixed point), 89 msec (floating point; 128x12 fixed-point
autocorrelation, 32 bit results, 5.3 msec; 12th order
floating-point autocorrelation matrix solution, 1.82msec.