Mobile to mobile digital wireless connection having enhanced...

Details Mobile to mobile digital wireless connection having enhanced... Mobile to mobile digital wireless connection having enhanced...

2006-02-28

2006-02-28

Trost, William (Department: 2683)

Telecommunications

Carrier wave repeater or relay system

C455S008000, C455S009000, C455S010000, C455S063100, C455S561000, C455S563000, C455S570000, C375S211000, C704S204000

Reexamination Certificate

active

07006787

ABSTRACT:
This invention is directed toward improving the subjective voice quality of a mobile to mobile phone call having tandem vocoder processing by modifying the spectrum of the voice signal before it is processed by the second vocoder to compensate for digital distortion which is generated by the second vocoder. An adaptive filter can be used to modify the spectrum of the voice signal. With this invention, the voice quality of a call from a first mobile phone to a second mobile phone has a quality that is substantially similar to the voice quality of a call from a mobile phone to a desk phone.

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Haykin, Simon; “Adaptive Filter Theory”, third edition; Prentice Hall, Upper Saddle river, NJ 07458, 1996, pp. 2-5 and 9-21.

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