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woof at nortel.com
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 Posted: Mon Dec 22, 2008 4:41 pm Post subject: [Freeswitch-users] Extra loud prompts when transcoded from L |
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Woof!
I've noticed that the percieved volume of prompts recorded at L16@8000 is much louder (to the point of distortion) when played back via G.722 on Polycom phones, vs when played back via G.711. The same prompts are also slightly louder when played back on SNOM phones via G.722 vs G.711, but not nearly as obnoxiously loud.
I'm not sure if FS can do anything about this, it may be a Polycom issue, but is there a way to apply gain (negative in this case!) during the transcoding process so the percieved volume of the prompts is the same no matter which codec is selected?
--Woof!
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brian at freeswitch.org
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| Posted: Mon Dec 22, 2008 4:47 pm Post subject: [Freeswitch-users] Extra loud prompts when transcoded from L |
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When we convert them from 48k we can lower the vol a bit more we are
already doing it slightly.
/b
On Dec 22, 2008, at 3:38 PM, Andy Spitzer wrote:
| Quote: | I'm not sure if FS can do anything about this, it may be a Polycom
issue, but is there a way to apply gain (negative in this case!)
during the transcoding process so the percieved volume of the
prompts is the same no matter which codec is selected?
|
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woof at nortel.com
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| Posted: Mon Dec 22, 2008 4:56 pm Post subject: [Freeswitch-users] Extra loud prompts when transcoded from L |
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Woof!
On Mon, 22 Dec 2008 16:46:14 -0500, Brian West <brian@freeswitch.org> wrote:
| Quote: | When we convert them from 48k we can lower the vol a bit more we are
already doing it slightly.
|
The prompts we are using aren't from the FS set. It's not a matter of adjusting the prompts, they've work fine for G.711 for years now--it's that when real-time transcoded by FS to G.722 the volume is loud.
Also, consider a call that comes in via G.711 and records a message, saved as L16@8000 in a .wav file. Now play that recording back over G.722. It's way louder than if played back over G.711. So depending on which phone you pick up your messages on, the difference in percieved volume is quite dramatic.
--Woof!
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brian at freeswitch.org
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| Posted: Mon Dec 22, 2008 7:52 pm Post subject: [Freeswitch-users] Extra loud prompts when transcoded from L |
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can you provide me sound file samples?
/b
On Dec 22, 2008, at 3:55 PM, Andy Spitzer wrote:
| Quote: | Woof!
On Mon, 22 Dec 2008 16:46:14 -0500, Brian West <brian@freeswitch.org (brian@freeswitch.org)> wrote:
| Quote: | When we convert them from 48k we can lower the vol a bit more we are
already doing it slightly.
|
The prompts we are using aren't from the FS set. It's not a matter of adjusting the prompts, they've work fine for G.711 for years now--it's that when real-time transcoded by FS to G.722 the volume is loud.
Also, consider a call that comes in via G.711 and records a message, saved as L16@8000 in a .wav file. Now play that recording back over G.722. It's way louder than if played back over G.711. So depending on which phone you pick up your messages on, the difference in percieved volume is quite dramatic.
--Woof!
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