How to identify editting on AMR file
We work with a cyber forensic team. We have received a AMR format audio file from a mobile that has some conversation between two parties. Now we have to prove that the clip that the party one is showing to us is not the entire audio clip and that they have done some editing and removed some part of the conversation, so that the outcome of that conversation sounds negative.
How can we prove that the file is edited..? We don't have the original file with us.?
How can we prove that the file is edited..? We don't have the original file with us.?
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" me and you are sitting in front of each other and there's a mobile phone recorder ON in my pocket. Its recording all our conversations and the dealings that we have made. Now i later on edit some part of that recording from in between and removed some portion of the conversation from the end resulting in what i actually want from you to say.. Now you have to prove that yes you said all that is there in the remaining portion but you also said something extra tht is not there in it, the file is tempered with. You have to prove it now..."
And this is where we are stuck, we thought to use any sound editor application like "sound forge" or "Diamond Cut Live" to see the pattern of the frequency and if we find any mismatch in that pattern we can say and prove the tempering. But frequency pattern seems to be ok . What you have said about AMR codecs we'll definitely see that and then only i can reply back.
Thanks alot for the information its sounds really helpful as we dont have any clue what to do. And atleast you replied.