DttSP
Project
DttSP is an open
source project started by Dr.Frank Brickle
and Dr. Robert McGwier of the
DTTS Microwave Society to provide code to be used in various DSP
projects with an emphasis on Software Defined and Cognitive Radio.
You can reach DTTS Microwave to discuss this project via Frank Brickle or Bob McGwier or via
snail-mail:
The DTTS Microwave
Society
6
Kathleen Place
Bridgewater, NJ 08807
DttSP
implements the basic modulation, demodulation, signal conditioning,
and synchronization processes required to operate a high performance
transceiver using DSP as the detection and synthesis stages. While
the development is done primarily on Linux, the code is also available for use
as a Visual Studio 6 or Visual Studio 2003 project for Microsoft Windows®. It uses FFTW for much of the heavy lifting. On
Windows it uses Pthreads-Win32
for rational thread synchronization under Win32. DttSP
is written in ANSI-C. The basic architectural decisions include the use of
jack as the interface to the Linux
sound systems (ALSA, OSS, and PortAudio). With the use of PortAudio, the code should be portable to Mac OS X®
(not done yet, but it will be supported immediately in the CVS tree).
One of the major design goals of DttSP was to
provide an SDR core that was both efficient and capable of being integrated
into a number of different application environments. For example, the full SDR
functionality can be controlled and run either locally, via a graphical
console, or remotely, over a network, without changes or reconfiguration. Since
DttSP is directly aimed at being integrated into
practical applications, a high premium was also placed on reliability and
security. There are several innovations in the design meant to keep
system overhead low. One such instance is the extensive use of ringbuffers residing in memory-mapped files, which provide
fast one-way communication between user processes without handshaking or
intervention of the operating system.
DttSP is the digital
signal processing powering the SDR-1000: Flex
Radio and we are contributors
active contributors to the open source project associated with it.
Who are the founders? Well, both are
accurately called polymaths, but here are some details:
Dr. Frank Brickle,
the lead architect of DttSP, pursues a dual career in
musical composition and technology. He has a Ph.D. in Music from Princeton University. Along with musical work
since childhood, he has been involved in signal processing and computer science
since 1970, beginning his love-hate relationship with computers in 1965. His
compositions have been performed in concerts and broadcasts around the world.
He was director of the 2003 George Antheil
Festival, an international event devoted to the music of that great
American composer, who was also the patented inventor of Spread Spectrum.
Currently Frank is Secretary of the Composers
Guild of New Jersey. On the technical front, he has been the developer or
co-developer of applications and systems in a number of different areas in
communications. He is the author of many musical and technical publications,
including “Automatic Signal Classification for Software Defined
Radios” in the November/December 2003 issue of QEX. Frank was first
licensed as a radio amateur in 1962 as WB2GRK, fell inactive after college, and
returned with a vengeance in 2001 as an unregenerate brasspounder
with a new call, AB2KT. He is a member of ARRL and an active participant in
ARES/RACES.
Dr. Robert McGwier
has a Ph.D. in Applied Mathematics from Brown University
and works for the Center for Communications
Research as a member of the research staff. His thesis, “Regular
Perturbations and Nonlinear Filtering”, sprang from his interest in
phase-locked loops and range-rate orbit determination. Well-known as N4HY, he has been an amateur radio operator since
1964. Bob was the cofounder of the AMSAT-TAPR DSP project with Tom Clark, W3IWI.
Bob is author of the DSP code in the old AEA DSP1232 and DSP2232
multimode controllers. Timewave offered these units. He was a
designer and builder on the AMSAT Microsat’s
and participated in the Amsat-Oscar 13 and Amsat-Oscar 40 projects. Bob is the current Vice
President for Engineering for AMSAT and
is currently working on the AMSAT-NA Eagle project on
several software-defined radio transponders, the AMSAT-DL Phase3 Express project
where he is bringing up IPS for the
onboard computer and will author the software-defined radio for low speed telecommand on the AMSAT-DL
upcoming projects. Bob is currently chairman of the ARRL
Software-Defined Radio Working Group and a member of the High Speed Multimedia working
group. He is Bob is a member of ARRL, AMSAT,
TAPR, Packrats (V.P.) and the Frankford Radio Club.
CVS
instructions for Linux and Windows
Click the SourceForge logo for
the sourceforge project page:
