TI DSPs

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Some tools I wrote in the early 1990's

• TMS320C30 Assembler and Linker for PC command shell as30dos.zip
• TMS320C30 Assembler and Linker source for most platforms  as30r27.zip

• The main TI web site www.ti.com
• Where to go for help  comp.dsp

Code Development Board:

Code: See the software projects
Schematic: Not translated
Device: TMS320C30

This project is a board that I wire wrapped together to allow me to play with digital signal processing of audio in real-time.  I put this together in 1991 using parts left over from a giant graphics accelerator that we made at HP.  The board has 128K words of static RAM and a Crystal CODEC.  Notice the stereo RCA phono jacks on the right.  The big gray connectors on the left connect up to my ATARI 1040ST computer through a custom interface that I built in the late 1980's.  The board also contains a MIDI interface that connected directly to the 1040ST computer.

MIDI Tone Module:

Code: midi.zip (just the source fmaudio.asm )
Schematic: Not translated
Device: TMS320C30

This project is a stand alone music synthesizer using frequency modulation.  The software supports up to 5 simultaneous voices.  There are 128 voice timbres that can be modified using MIDI commands.  The only connections are MIDI in/out ports, power and audio in/out.  The code and default voice timbres are stored in one EPROM.  The voice timbres can be edited using graphical software that I wrote for the Atari 1040ST.  The tone module sounds pretty good and can make some very strange sounds or play Mozart like a charm.

Software Projects:

 
Library of functions:

Code: lib.zip (some of the source dspdrive.asm )

This library is used by most of the following projects.  It contains code to parse midi packets and handle the DSP loop of reading the A/D and writing the results

Echo Generator:

Code: delay.zip (some of the source delay.asm )

This code combines the stereo input with a delayed version of the input and sends it to the output.  The amount of delay and the blending function are controlled through MIDI system exclusion commands.  Very easy to create a flanger effect.

IIR Filter (Record Scratch Remover):

Code: filter.zip (some of the source filter.asm )

This code creates a 5th order low pass filter to remove noise off of 78 RPM records.  The results were pretty good but best on some old jazz piano records.

FM Audio Synthesizer:

Code: midi.zip (some of the source fmaudio.asm )

This code implements a synthesizer that is controlled with MIDI commands.  I built a stand-alone version of the hardware to run this code.

Spinning Speaker Effect:

Code: spinit.zip (some of the source spinit.asm )

This code creates an effect that makes the audio sound like it is coming from a speaker mounted on a spinning platform.

None

I have not messed with this stuff in nearly 10 years but it was a blast.