Guys, how much bandwidth does slinear comsume and what quality can it be compared with? g711, gsm, g729?
Anton Krall schrieb:> Guys, how much bandwidth does slinear comsume and what quality can it be > compared with? g711, gsm, g729?Hi, the bandwith is approx double compared to G.711, since it uses 16bit (signed) integers, whereas G.711 uses 8bit integers. The human ear has approximately a logarithmic sensivity, and G.711 has a logarithmic resolution. Thus the quality gain of slinear compared to G.711 may not be very much. Roger.
|-----Original Message----- |From: asterisk-users-bounces@lists.digium.com |[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of |Roger Schreiter |Sent: Monday, March 13, 2006 4:56 PM |To: Asterisk Users Mailing List - Non-Commercial Discussion |Subject: Re: [Asterisk-Users] slinear bandwidth | |Anton Krall schrieb: |> Guys, how much bandwidth does slinear comsume and what |quality can it |> be compared with? g711, gsm, g729? | | |Hi, | |the bandwith is approx double compared to G.711, since it uses 16bit |(signed) integers, whereas G.711 uses 8bit integers. | |The human ear has approximately a logarithmic sensivity, and |G.711 has a logarithmic resolution. Thus the quality gain of |slinear compared to G.711 may not be very much. | Might be good for faxing though
On Monday 13 March 2006 23:16, Anton Krall wrote:> Might be good for faxing thoughDoubtful. Faxes are designed to work within g711 limits. I personally have been faxing through Asterisk (Canon and Xerox fax machines, the most notorious for being fickle) for well over a year now. It generally works. My call path is this: Fax - Adit600 - TE405 - Asterisk - 1-hop SDSL - Asterisk - TE405 - Telco -A.
Anton Krall schrieb:> ... > Might be good for faxing thoughHi, faxing suffers mainly from jitter, not from logarithmizing of the audio data. In PSTN G.711 is the standard and does not seem to impose problems on faxes. G.711 is ISDN quality! I assume, for fax quality and reliability the change between slin and G.711 will almost show no difference. Roger.