10. A device as claimed in claim 3, wherein said second modification of a pitch component of the speech pattern comprises a lower pitch with respect to a mean pitch component of the speech pattern.
3. A device as claimed in claim 1, wherein the data-processor unit further comprises position determining means for determining the position of at least one letter of a word consisting made up of characters presented and for introducing a second modification in the speech pattern for said letter while maintaining the its identity, said second modification comprising a modification of a pitch component and/or a voice-characterizing component of the speech pattern.