H - Electricity – 04 – J
Patent
H - Electricity
04
J
354/71
H04J 3/00 (2006.01) H03M 1/00 (2006.01)
Patent
CA 1101558
ABSTRACT OF THE DISCLOSURE A PCM codec includes known parts used to convert analog signals to PCM words and vice versa. At least one of the parts is used for both conversion types in spite of that the clock pulse frequencies of the incoming and outgoing PCM words are different. A timing unit generates time intervals a first and second number of which is needed at the very most to carry out a conversion operation of the first and the second type, respectively. The shorter of the period lengths determined by the two clock pulse frequencies includes at least the sum of said two numbers of time intervals. A control unit receives the clock pulses in order to notify respective conversion type and generates conversion type signals by means of which each of said time intervals is associated with one of the two conversion types and the codec parts are configurated for the execution of respective conversion operation. To master states where a type signal is generated delayed in relation to the notification pulse, the codec comprises information memories to store the influenced information. To master states where the control unit interrupts the present conversion operations of the one type due to the priority of the other type, the codec comprises a result memory to store such intermediate results which make it possible to continue the interrupted operation after the termination of the priority operation.
274176
Jansson Erik L.
Svensson Tommy E.
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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