Dynamically change pitch of an audio playback

Hello, I am currently working on a real-time Simulink simulation of a high speed craft simulator for my final year University project. The simulator uses a joystick input to control the thottle of the craft. I wish to relate this throttle position to the pitch an engine audio output, but am so far having little joy.

What would be the best approach to altering the pitch of an audio file as it plays back? I have attempted to use a Phase/Frequency offset block, but cannot find how to dynamically alter the frequency offset parameter. I have also attempted using upsample and downsample blocks, but again ran into the problem whereby I could not change the up/downsample factor as the throttle position was changed, with the added inconvenience that a low-pass filter was needed.

Any help would be much appreciated!

[James]

Anybody with any suggestions?

[Paulo Silva]

Maybe messing around with the audio amplitude, instead of increasing the pitch you could increase the amplitude?

[James]

I don't follow... I'm not trying to change the amplitude/volume, I'm trying to change the pitch.

Answer 1

[James]

Realised that the frequency offset block has an external frequency offset option. Now I just need to find how to change a continuous signal to a discrete signal (as the frequency in doesn't work if the signal is continuous), and I'm there!

Answer 2

[James]

Actually this produces an audio signal with very poor quality - unsure of exactly why, but it doesn't seem the way forwards.