Noob here, help needed , audio pitch bend project for my RC car.

Other Hardware Audio
1

Noob here, help needed, audio pitch bend project for my RC car.

Hi.
Last month,I just made a complete circuit for control LED in my RC-Car. It made from standalone Mega168. I have gained knowledge from this site. Everything goes well.

For next step, I have thinking about a sound engine for my RC car. I really want any suggestion about audio playback technique that can play an engine sound file (wav) and also can bend a sound to higher-lower pitch relate to throttle Stick from RC radio controller. I can write a code for retrieve a signal from RC receiver, but for audio pitch bend is too hard for me.I can't find any arduino library relate to audio pitch bend or change a sampling rate capability.

The goal of the project:

-pitch bend for engine sound when increase-decrease throttle Stick.

-can play 2-3 sampling files simultaneously when get interrupt from PWM signal (turn left-right sound,change gear sound or any sound like a brake)

-simple circuit as possible.

I found another project relate to my project but i can't find an example code to learned.

and what/where is a datasheet p.133 from this page
http://playground.arduino.cc/Code/PCMAudio

Sorry for my bad English, English is not my native.

Thank for your help.

arduino.jpg

2

The playback pitch is determined by this line

OCR1A = F_CPU / SAMPLE_RATE;    // 16e6 / 8000 = 2000

If you cahnge the sample rate pitch will change accordingly. Remenber to turn interrupts of dureing change and turn them back on again after change.

3

Thank you for your reply.
Now,I need to learn more about register configuration before going to the next step.I will try to combine sample rate change and playback 3 wave at same time together. It's hard for newbie like me but I will try.

I still waiting any suggestion from everybody.Thank in advance.