Signal-processing device for a rotation-measuring apparatus , preferably for a vehicle , which rotation-measuring apparatus has a rotation-measuring sensor and a rotary measuring body , wherein the rotary measuring body comprises a feature quantity (AM) of measurement features , wherein - the signal-processing device is configured to provide temporally successive message sequences , and - a message sequence comprises a message quantity (A) of successive messages , such that - temporally successive messages are assigned in temporal succession to spatially adjacent measurement features , wherein the measurement features interact with the rotation-measuring sensor , and each message is provided in a message type (NT, C, T, P) selected from a predetermined quantity of message types, and - a message arranged at a selection position (PSF) of the message sequence is a message of a predetermined type , which describes a feature property of the assigned measurement feature , wherein - the successive message sequences comprise a first and a second message sequence (110.1, 110.2), - the signal-processing device is configured to select the selection position (PSF) for the message sequence such that - for the first message sequence (110.1), a first selection position (PSF1) for a first message of a predetermined type (123.1) is provided, and for the second message sequence (110.2), a second selection position (PSF2) for a second message of the same predetermined type (123.2) is provided, characterized in that the signal-processing device further comprises: - a coding unit which is configured to encode and/or decode index information (IX) and/or useful information (IY), wherein - the coding is carried out by the arrangement of at least one message of a predetermined type , preferably a temperature message , at a sequence position (PS) in a message sequence . - the signal-processing device is configured to provide temporally successive message sequences , and - a message sequence comprises a message quantity (A) of successive messages , such that - temporally successive messages are assigned in temporal succession to spatially adjacent measurement features , wherein the measurement features interact with the rotation-measuring sensor , and each message is provided in a message type (NT, C, T, P) selected from a predetermined quantity of message types, and - a message arranged at a selection position (PSF) of the message sequence is a message of a predetermined type , which describes a feature property of the assigned measurement feature , - the successive message sequences comprise a first and a second message sequence (110.1, 110.2), - the signal-processing device is configured to select the selection position (PSF) for the message sequence such that - for the first message sequence (110.1), a first selection position (PSF1) for a first message of a predetermined type (123.1) is provided, and for the second message sequence (110.2), a second selection position (PSF2) for a second message of the same predetermined type (123.2) is provided, - a coding unit which is configured to encode and/or decode index information (IX) and/or useful information (IY), wherein - the coding is carried out by the arrangement of at least one message of a predetermined type , preferably a temperature message , at a sequence position (PS) in a message sequence . <EOS>