https://github.com/abdallahhemdan/wasla

Wasla is a project to modulate and perform synchronous demodulation for speech signals
https://github.com/abdallahhemdan/wasla

communication communication-systems demodulation frequency-domain matlab modulation speech-signal-processing wasla

Last synced: 9 months ago
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Wasla is a project to modulate and perform synchronous demodulation for speech signals

• Host: GitHub
• URL: https://github.com/abdallahhemdan/wasla
• Owner: AbdallahHemdan
• License: mit
• Created: 2021-01-21T16:01:33.000Z (about 5 years ago)
• Default Branch: main
• Last Pushed: 2021-01-21T16:46:51.000Z (about 5 years ago)
• Last Synced: 2025-05-07T09:07:17.428Z (9 months ago)
• Topics: communication, communication-systems, demodulation, frequency-domain, matlab, modulation, speech-signal-processing, wasla
• Language: MATLAB
• Homepage:
• Size: 1.5 MB
• Stars: 12
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          


![component 17](https://user-images.githubusercontent.com/40190772/105380975-27670c00-5c17-11eb-9158-b39d562e7b9f.png)





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## About

> Wasla is a project to modulate three speech signals using the following scheme: `𝑠(𝑡) = 𝑥1(𝑡) cos 𝜔1𝑡 + 𝑥2(𝑡) cos 𝜔2𝑡 + 𝑥3(𝑡) sin 𝜔2𝑡`, and then perform synchronous demodulation

## Modulated signal



![image](https://user-images.githubusercontent.com/40190772/105381983-474aff80-5c18-11eb-8e0c-3d45454de366.png)

![image](https://user-images.githubusercontent.com/40190772/105381993-49ad5980-5c18-11eb-9b0c-a76dcfb6e8cc.png)



## Interference between modulated signals

- The Interference was between the low amplitude frequencies which has a very low impact into the final demodulated signals.

- The interference between the high amplitude frequencies was very low and the high amplitude frequencies have the most sound properties.

- So our final results didn't affected by the interference.

## Demodulated signals in (2) - (3)



![image](https://user-images.githubusercontent.com/40190772/105381975-44e8a580-5c18-11eb-813b-6f3bf36b7345.png)



- The demodulated signals in (2) was as the original signal because of no shifting in phase (phi = 0)

- In (3), shifting by 10, 30 degrees attenuates the demodulated signals (speech signals) making them lower than the original ones.

- Shifting by 90 degree strongly attenuates the speech signals and it seems like no output speech.

### Contributors



  


  

    
Abdallah Hemdan


     
Adel Mohamed


  

 

 

 


### Licence

[MIT Licence](https://github.com/AbdallahHemdan/Wasla/blob/master/LICENSE)