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Re: speech degradation in a GSM network transmission
There are at least two different categories of degradation you can add
to your signal, one is typical in the "continuous/analog" world, such as
comb effects, echoes, undesired dynamic compressions, attenuation in
bands around 4kHz (important for voice), harmonic distortion, etc, and
the other is typically "digital generated", as artifacts generated by
MP3 compression at lower bitrates, very harsh to listen to.
For the first one you can use for example audio effects/editing
software, which offer several possibilities, and for the second one, you
can pass your signal through a mp3 encoding-decoding chain.
Matlab/Simulink has some sources of noise that could be useful also.
Hope these ideas are useful.
Faten B.A. escreveu:
I want to introduce some artificial degradation to a speech signal in
order to simulate speech degradation in a GSM network transmission.
The addition of a background noise seems to be simple but I don't know
which type or noise distribution I have to use.
I want also introduce frequency degradation and I have no idea about
the way this must be done.
Can anyone advice me or send me some documentations about this topic?
Regis Rossi A. Faria
LSI - University of Sao Paulo
Audio Engineering and Coding Center