Nokia Mobile Phones Limited

Arnold Von Holten

Timo Kolehmainen

A GSM mobile telephone includes a digital audio interface for interfacing with a system simulator for test purposes. A digital signal processor within the mobile telephone includes a codec data register that interfaces to an analog codec which provides A/D and D/A conversion of speech signals. An interface circuit is connected to the codec data register and includes a digital audio interface block and a test access port data register, both of which enable test data inputs and test data outputs to be respectively fed to the mobile telephone's digital signal processor and enable test functions to be accomplished without a requirement for loading of test program into the mobile telephone station.

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Cascais, Portugal

Arnold Von Holten