Christian wrote:
Hi,
I'm recording wave files but I cant get Asterisk to play them, only if
they are in 8000 Hz. What is the maximum sample rate Asterisk can
handle? I have been using 16-bit 44.1, 22050 and finally 8000 kHz.
To my knowledge, the only correct format for wav files to use in
asterisk is 16-bit 8 kHz. 8-bit is also possible, but will result in
considerably worse quality.
http://www.voip-info.org/tiki-index.php?page=Asterisk%20sound%20files
Any sample rate higher than 8 kHz would be useless because most POTS
providers filter their calls at around 4 kHz anyway. The sample rate you
need to encode a signal is (at least) twice the maximum singal
frequence. This leads to a sample frequency of 8 kHz . I'm not sure if
this is the reason why asterisk limits the use of wav files to 8 kHz.
Since a phone line uses a 12 or 13-bit compressed signal at a sample
rate of 8 kHz, using a higher frequency for wav files would imply the
need to downsample on the fly. This could result in quite some
performance loss.
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