The following links, may be of your help:

https://help.acdsystems.com/en/acdsee-21/Content/1Topics/4_View_mode/WorkingImages_Vmode/IDDH_AUDIO.htm

https://play.google.com/store/apps/details?id=com.edukunapps.picvoice

Yes..

Spectrograms are the visual displays of speech/voice. In simple terms, spectrogram is considered as 'speech made visible'!

Best..

GK

Hi

I agree that you can start with spectrogram to as it's mimicking brains process sounds while responding to frequencies.

http://en.wikipedia.org/wiki/Spectrogram

Note that a mono sound represents a one dimensional variable

Check also this.

on the oreverse side, try to check the following video

How to Convert an Image to Sound Waves - Make A Picture into Audio using MetaSynth 

https://www.youtube.com/watch?v=1L3XfnNomfo

Good Luck

Maki Habib

Seems it is interesting topic. Good luck 

Try 

https://www.youtube.com/watch?v=DuiryHHTrjU

Good Luck Borut 

Spectrograms are well-known for your purpose.

Dear Chintalapati Mrudula

The enclosed thesis explains the transformation from one dimensional voice signal to two dimensional image.

Good Luck.

Prof. S. EL-Rabaie 

Thank you so much for all your support!

Sorry for the delayed response.

This info you all provided was of great use!

please inform me if you find the best and simple way

thanks

The following links, may be of your help:

https://help.acdsystems.com/en/acdsee-21/Content/1Topics/4_View_mode/WorkingImages_Vmode/IDDH_AUDIO.htm

https://play.google.com/store/apps/details?id=com.edukunapps.picvoice