The "voice" of an author also comes through in the tone and mood of the piece. Along with the simple diction and prose style, the mood and tone created by the words the characters say and what they think is one of tense anxiety. No one is ever completely at ease in the novel...even within the walls of the secret room Julia and Winston rent to escape from it all. In this way, we might suggest that Orwell's voice is one of warning that any overly controlling government can confine us all in such a way and that we should all be vigilant against such steps that a government might take in order to come to power.
I'm not sure I fully understand your question, so I am going to give you information relevant to the novel that would seem to connect to the question you have presented.
1984 was written in third person limited point of view. The limitation forces readers to see the story through the eyes of Winston alone, the tired soul seeking independence but having it stripped from him.
Orwell's own "voice" can be seen in two ways. The first, as is true of any author, is in the diction of the story. 1984 is simplistic in its prose. The descriptions and the action are not designed to evoke strong emotion, but are left to harsh specifics. No embellishment of beauty or of tragedy is provided, but scientific reporting used consistently throughout. This cold diction helps to underscore Orwell's creation of a world where individuality and passion have been discarded.
In another way, Orwell's voice can be observed in the appendix. Again, the explanation of Newspeak is written with a scientists attention to detail and lack of embellishment. However, as is the case with the text of the novel, this practiced use of understatement and lack of emphasis comes across as sarcastic. Orwell's pesimisstic tale is relayed with a cynic's voice.
it is the voice of a dictator