Circuit arrangement in a mobile phone for a digital mobile telephone system

Claim 1

A circuit arrangement for a mobile telephone operating according to a digital mobile telephone system comprising: a speech only module including: a transmission function module including speech coding means for converting speech into compressed digital form, channel coding means for generating error correction patterns and combining the error correction patterns with the compressed digitized speech, and multiplexing means for arranging digital bits of the combined error correction patterns and compressed digitized speech into appropriate time slots of a multiplexed signal; a receiver function module including demultiplexing/channel decoding means for extracting speech information from the multiplexed signal and performing error correction; a transmitter/receiver function module including modulating means for modulating the multiplexed signal according to a digital mobile telephone standard; a memory unit having a first storage capacity no larger than that necessary to accommodate a speech-only call between the mobile telephone and the mobile telephone system; and a central processing unit for controlling the circuit arrangement and storing information in the memory unit; and an adaptor unit connected to the speech-only module the adaptor unit having encoding and decoding means for transmission and reception of non-speech data information from the speech-only module and an auxiliary memory unit having a second storage capacity, the combined storage capacity of the memory unit and auxiliary memory unit being at least sufficient to maintain a speech and data call between the mobile telephone and the mobile telephone system.