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Introspection Late Night Partying. Rainy Day Relaxation Road Trip. Romantic Evening Sex All Themes. Articles Features Interviews Lists. Play Any File Pitch Switch supports most sound file formats. Testimonials This is the greatest music tool ever!!!! Thank you! Getting Started. User safety is not an issue for this project, since the user need only use the mouse to click on the screen and hold the microphone close to their face while speaking.
To prevent audio feedback, we use a microphone that has a long enough cord such that the user can easily remain at a large enough distance from the speakers to avoid these undesirable effects.
Furthermore, we did not experience any interference issues while working on this project since the microphone needed to be held fairly close to the user in order to receive the audio input. The video below contains a demo of the real-time pitch shifting effects performed by the final hardware design.
Overall, this was a successful final project as we were able to implement real-time voice pitch shifting along with several other voice effects. Most importantly, the design we use is extremely simple and efficient in terms of the hardware implementation.
One thing to note is that our method for pitch-shifting the voice input is a time-domain solution as opposed to the more common frequency-domain solutions that are found online. In terms of future work, it might be interesting to complete a frequency-domain pitch-shift method Album) well and compare the final results to our current design, evaluating the pros and cons of each method.
However, we are satisfied with our design since it achieves all of the capabilities we had planned for at the outset of the project, and we were able to Album) complete and test all aspects in the short project time-line. We did not reverse-engineer any designs, nor do we suspect that we are the only users of a circular-buffer method of pitch-shifting in the time domain.
As a result, we do not foresee any patent opportunities from this project, but we are happy with our independent implementation nonetheless.
We would like to thank Bruce Land for helping and advising us throughout the entirety of the project. We would also like to thank the course Teaching Assistants for their advice on the lab assignments over the course of the semester, from which we were able to learn the skills needed to design and complete this project.
See GitHub for code. Figure 1: Picture of the project setup High Level Design We decided to pursue this project idea after seeing the audio output capabilities from lab 3, as well as a desire to have a fun project with an interesting demo. Figure 5: Circular buffer module state machine As noted in Figure 5, the buffer module is also responsible for performing the delta modulation of the pitch shift amount when appropriate. Testing Testing was done by creating a separate verilog module containing all aspects of the dual-buffer design and then simulating this design in ModelSim using a counter to represent the input audio samples.
Figure 6: Waves screenshot of buffer test Filter Design We used a 6th order Butterworth filter on the output from the circular buffers in order to smooth the high frequency noise from the signal. Testing Being able to simulate the wrapper was beneficial to our testing. Testing The entirety of the testing done for the HPS program was done through usage testing, as it was primarily a user interface.
Figure Shifting the frequency up and down Figure On the left the shifted output shows the discontinuities resulting from the averaging the circular buffers. On the right we tested different filters and combinations resulting in our choice to use a Butterworth filter As described in earlier sections, the final design enables the user to modify the output voice pitch by up to one octave in either direction. Conclusion Overall, this was a successful final project as we were able to implement real-time voice pitch shifting along with several other voice effects.
Appendix A The group approves (A Higher Form Of) Killing - Pitch Shifter* - Desensitized (CD report for inclusion on Album) course website. The group approves the video for inclusion on the course YouTube channel.
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