[asterisk-bugs] [JIRA] (ASTERISK-22178) Enquiry about channel bandpass filter (narrowband and wideband) in codecs implementations G.711 and G.722

[Laura Fernandez Gallardo (JIRA)]

Laura Fernandez Gallardo created ASTERISK-22178:
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             Summary: Enquiry about channel bandpass filter (narrowband and wideband) in codecs implementations G.711 and G.722
                 Key: ASTERISK-22178
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22178
             Project: Asterisk
          Issue Type: Information Request
      Security Level: None
            Reporter: Laura Fernandez Gallardo


Dear Asterisk developers,

I am conducting research on the quality of speech signals in telephony, focusing on the differences between narrowband and wideband. I have set up a connection between a Polycom phone and a SNOM phone employing Asterisk and everything went fine. I would need to know now how the codecs G.711 alaw and G.722 (both 64 kbps) are implemented in Asterisk. I assume they follow the ITU standards, 

but my question is: is there a channel bandpass filter applied along with the coding-decoding processes? i.e. ITU rec. G.712 for narrowband and ITU P.341 for wideband, or similar.

I have not found information about this on any website or on Asterisk forums.

Thank you very much in advance, any help on this matter will be appreciated.

Laura


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