WAV Files

[madronicle]

Can anyone advise please?
I have a telephone recording which is not the same as the original recording (from memory).
Using Audacity..............
How can I tell if parts of the track have been removed or subsituted
Was sent to me as an attachment via email
Have Win 7 Pro
Many thanks

[steve]

If there are any background noises, listen to them carefully for any discontinuities.

If cuts/edits have been made, but not very well, then by switching to the Spectrogram track display you may see vertical lines like this:

bad edit

window001.png (111.37 KiB) Viewed 908 times

Note that a good edit will not show this. Also, vertical line like this may be caused by any click, not just a bad edit, so it is not proof of an edit, just a possible indication.

Bare in mind that it is scientifically proven that memory can be highly unreliable.

[madronicle]

Hi Steve
Thanks for quick reply.
Will have a look in Spectorgram.
Know what you mean about memory. But..........
There is a key phrase/question I asked but missing!
Tony

[DVDdoug]

You can't... Your ears are probably the best tool. For example, if the background noise changes or the volume or changes or sound character changes, maybe that part was recorded at a different time under different conditions.

But, it's possible to remove parts or move parts around, and if you do a good job there will be absolutely no evidence.
If you do a bad job, there may be a "glitch", but you can also get glitches in a normal phone connection.

A WAV file is just a sequence of numbers, and there's really no way to know if the sequence has changed unless you have the original file/sequence.

[madronicle]

Is there any way to establish when the recording was created?
Not when created on my PC, but originally from the copy.
I presume it is a series of numbers (binary)
How do I look at the guts of it
They also sent.( by mistake?) a smaller file (75kb MP3) (larger file, actual recording 1.75mb) which when I try to open have error message............
Cannot open file and am referred to Microsoft help which suggests ID3 Tag headers problems
ps
Have managed to import smaller file using raw data in Audacity (What a program!)
Just a hiss, but can view sound waves
Thanks all

[steve]

Is there any way to establish when the recording was created?

No there isn't.

If you want to play the MP3 you could try VLC http://www.videolan.org/vlc/
(it's a free player that can play most things).

[madronicle]

Tried Videolan without success. Error UNDF
Tried gspot to recognise codecs No luck

Thanks all

[kozikowski]

Anybody talented in editing can create a new recording and few people can tell what they did. The entire broadcasting and film industry works on skillful editing.

There might be a tool within VLC Player that will give you File INFO. That might tell you when the last time the file was changed, not the first time the file was recorded.

Koz