You need to set up by using the headset that integrated in the microphone. You can purchase the headset in the local repair shop so that you can get the better result. Proper hardware configuration is more important for the Skype users to get the proper quality. It is advisable to use the headphone instead of speaker. Suppose you can get the Microsoft in as external device than you can get the better quality sound. You also get update the sound card drivers to get the proper setup. You need to set up proper hardware as well as software set up to get the configuration to get the good sound quality.
Ya, most of the Skype users get the echo sound many times while connection through Skype. You can review the audio devices to make the personal call and switch over to get the speaker to get the better quality sound. If you are using the webcam with Skype than you can get sound easily. Speaker also pickup the noise too. It is one of the most suitable way to get upgrade the Skype system to get the better voice quality.