Audio tempo changer

Hi ,

I want to change the TEMPO (Playback Speed ) of audio file with arduino please help

If you are using an audio shield it's probably not possible because the audio shield has it's own hardware sample rate clock.

If you're using the TMRpcm library you should be able to change the playback sample rate (but I don't know how to do that).

Nikhil123:
I want to change the TEMPO (Playback Speed ) of audio file with arduino please help

And what do you want to happen to the frequency of the audio?
If you don't want the frequency to change when the tempo changes then it is almost impossible.

A good Phase Vocoder is actually on my to-do list for the Teensy Audio Library after we have a 180 MHz version of Teensy available.

Sure, this sort of thing is impossible to do in real time on slow and memory limited 8 bit AVR. But on a fast 32 bit ARM Cortex-M4, it very possible indeed. It might even be (just barely) possible at 96 MHz... maybe?