ADAU1467 Octave Effect For Guitar
Thread Summary
The user inquired about using the ADAU1467 Eval board to create an octaver for a guitar, specifically adjusting the pitch up or down by an octave. The final answer suggested using a project by another user that employs a sawtooth signal to drive a variable delay, which can double the input's pitch, sounding better than the stock pitch shifter. The user was advised to start with simple projects in SigmaStudio, using the SigmaStudio Documentation Wiki and exploring number formats and DSP math as they progress.AI Generated Content
Good day.
I have just got the ADAU1467 Eval board and have it connected and making sound with my guitar. I am new to this and DSP in general, but would like to learn how to use Sigma Studio. I would like to know if it's possible to make an octaver with this chip for guitar that can adjust the pitch up and down by an octave. I played with the pitch transposer but would like to know if this will work for what I want to do?
Also, how do most people go about learning how to use the software in the early stages? Any insight would be appreciated!
Thanks
Audio Signal Processors
software
adau1467
SigmaDSP Audio Processors
Hello Revv,
@Levi had built a project which shifts pitch — see this thread:
https://ez.analog.com/dsp/sigmadsp/f/q-a/544507/custom-sawtooth-signal-in-adau1452/417314
I forgot how it works but it uses a sawtooth signal to drive a variable delay, which doubles the input’s pitch. To me it sounded a little better than the stock pitch shifter. The ADAU1452 code will run on a ADAU1467.
Learn SigmaStudio by progressing from easy projects to more challenging ones, making the usual beginner’s mistakes and learning as you go. Allow your interests to guide you. For example, if you wish to make an active crossover, a compressor, or a reverb -- build a simple project with those blocks. The SigmaStudio Documentation Wiki is your friend -- it describes what the blocks do and often gives usage examples. There’s helpful sections such as Getting Started, Using SigmaStudio, and the Toolbox block help. Search EZ for ideas, and continue asking questions here.
You can build and experiment with many interesting applications without knowing anything more about the actual hardware (the ADAU1467 and its support components on your Evaluation Board) and the nuts-and-bolts math which powers SigmaStudio's function blocks. As you move on toward external runtime control of your project via analog and digital I/O, you'll need to know some deeper topics. The first of these is the integer and decimal number formats used inside SigmaDSPs. As you explore external control, you'll need details in your eval board Users Guide. And if you wish to build your own hardware boards and control via a microcontroller, you'll need to study the ADAU1467 Data sheet. At some point knowing some DSP math becomes useful, then this book — https://www.analog.com/en/education/education-library/scientist_engineers_guide.html
stands out as very accessible.
Best regards,
Bob
Wow thanks Bob, i appreciate the wonderful response!
Yes that project is better than the stock pitch shifter, when running guitar through it, it does what i would expect. It has some sort of clipping artifact to it though, i will need to learn more about what is going on there and how these modules work to srt it out. Well, atleast i hope it can be sorted out, cause it would be perfect!
The roadmap to learning you provided is great, thanks for that. I will continue to do as you suggest and hopefully get to a point that will help me understand DSP better. Its a long road but boy it looks very much worth it!
Cheers!
Hello adau 1701 pitch shifter algoritma?
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