signal bandwidth for cellular networks

Hi

When a speech or audio signal is sent through a GSM or CDMA cellular phone,
what is the maximum audio frequency that is encoded by the codec? For
example, 4kHz is considered as the cutoff for a plain old telephone system.
GSM uses a CELP based encoder (?) ,so the number may be related to the
standard. Any approximate figures would be appreciated.

TIA,
Siddharth

Hello Siddharth,
Actually 4kHz is a real hard cutoff for POTS lines. They usually roll off at
3.2 or 3.4 kHz. Cellular vocoders aren't very different from POTS lines in
their frequency response limits

Clay
.


"Siddharth Mathur" <smathur@removethis.softhome.net> wrote in message
news:bnrf7q$l9j$1@oasis.ccit.arizona.edu...
> Hi
>
> When a speech or audio signal is sent through a GSM or CDMA cellular
phone,
> what is the maximum audio frequency that is encoded by the codec? For
> example, 4kHz is considered as the cutoff for a plain old telephone
system.
> GSM uses a CELP based encoder (?) ,so the number may be related to the
> standard. Any approximate figures would be appreciated.
>
> TIA,
> Siddharth
>
>