If someone is an expert with the sowftares named or an forsenic expert he surely would be to tell with confidence if it's altered or notGood day all, reviving my old thread. I have a question regarding audio editing. If a certain audio file say of wav format is edited by either deletions or making additions, this editing can be detected by way of critical listening whereby, as claimed, certain clicks or other sounds will be heard where the editing has been done. Further it is claimed that spectrographic analysis using softwares like audacity soundforge, etc. editing can be confirmed as the graph will show peculiar breaks.
It has been claimed by some that after editing if the file format is converted several times and than it is converted back to its original format and attributes, the editing becomes impossible to detect. I want to know how far this is true? Is there any software which can automatically detect editing without the use of critical listening and manually searching for edits in the spectrograph.
I will be grateful If anyone can throw light on this issue
Thanks in advance
Regards
Any editing in the audio format can be detected by software, for example Adobe Audition Frequency Spectrum Analyser. One has to compare the 'original' and the 'edited' file. It shows graphical nature of differences right from frequency to amplitude on timescale. Adobe Audition latest version has come out with graphical editing of this frequency spectrum image where we can manipulate things easily like photo editing software. Somewhere in the forum I had uploaded cleaned 78 recordings. They are amazingly wonderful software.I want to know how far this is true? Is there any software which can automatically detect editing without the use of critical listening and manually searching for edits in the spectrograph.
I will be grateful If anyone can throw light on this issue
Thanks in advance
Regards
Thank you but there is only one file the original file is not available. So the file available could be said to be the original file. Is there a way the software can flag the specific locations where edits have been made? As I have mentioned in my post is it possible to hide the edits by conversions and reconversions to the extent that the finally the edits made cannot be detected visually through spectrograph or critical listening? Will Adobe Audition bring out the edits despite these multiple conversions?Any editing in the audio format can be detected by software, for example Adobe Audition Frequency Spectrum Analyser. One has to compare the 'original' and the 'edited' file. It shows graphical nature of differences right from frequency to amplitude on timescale. Adobe Audition latest version has come out with graphical editing of this frequency spectrum image where we can manipulate things easily like photo editing software. Somewhere in the forum I had uploaded cleaned 78 recordings. They are amazingly wonderful software.
Good day.
Regards.
I think most people here are audiophiles in the sense that they enjoy music on high end systems.. What you need is a person experienced in forensics which is a altogether a different subject. Since this is a court case, I suggest you get in touch with police's forensic department or any other method.Thank you Hiten. The matter relates to a close friend of mine, its a divorce case and the audio clip has been submitted by the other party as evidence. We both are non technical persons. Since I am a member of this great forum and there are such great technical people, like you, on this forum who are ever ready to help, I took the initiative to put a query here. The editing means additions/deletions. My friend believes that there are certain words which are not there in the audio clip which he had said and further there are some words which appear, but not to have been said at that particular time which change the context altogether. Consultation with forensic experts revealed that if the file is converted and reconverted 5 to 6 times and than it is brought back to its original format than it is next to impossible to detect the edits, hence this post. Although there are some very glaring digital anamolies but the experts say that they are digital discrepencies hence would not stand in the court. Frankly neither I nor my friend understand these discrepencies and their importance. Nevertheless if you can suggest something than please do.
Thanks & Regards
Thank you for your reply.I think most people here are audiophiles in the sense that they enjoy music on high end systems.. What you need is a person experienced in forensics which is a altogether a different subject. Since this is a court case, I suggest you get in touch with police's forensic department or any other method.
AVR, just from a brief research and decided cases I see that "auditory analysis" "waveform and spectographic analysis of audio and video files to find any alterations " (the words in inverted commas are from a decided case in India) are methods that FSL do use in Court cases in India to decipher genuiness of an electronic record .I think they are Capt. as corroborative evidence. Thanks Sushant but the strict part although applicable in writing but not followed in practice, atleast not in lower courts.
Rgds.