The Mellotron Group

Oops, I forgot to mention, that 4KHz is also the theoretical upper limit of the 8KHz sample rate.  Anything above 3-4KHz is useless info, and may interfere.
 
  -Bruce D. (again)
   

________________________________
 From: Bruce Daily <pocotron@yahoo.com>
To: "newmellotrongroup@yahoogroups.com" <newmellotrongroup@yahoogroups.com> 
Sent: Thursday, January 10, 2013 3:24 PM
Subject: Re: [newmellotrongroup] off topic help
  
 
   
 
Hi Fritz-
  Gino may be thinking what I was thinking.  EQ it first, with a bandpass between 300 Hz and 4 KHz (close to landline response).  This keeps outside frequencies from interfering in the A-D conversion.  THEN convert it to digital.
 
   Hope this helps.
 
  -Bruce D.
 
 

________________________________
 From: gino wong <wonggster@gmail.com>
To: newmellotrongroup@yahoogroups.com 
Sent: Thursday, January 10, 2013 1:04 PM
Subject: Re: [newmellotrongroup] off topic help
  
  
This stuff can be hard.  If it were analog I would go 250 nanowebers to forstall any chance of distortion.  
I haven’t been in this specific situation but.  I have found that you end up questioning the specs in this range.  
I would make sure you are getting true 8 bit and not 4 or 2. or just cause it says 8 bit are entitled to use it from your point of entry or does it burned onto rooms or pushed into dialogic chip banks.

You may end up using a KSU as a Preamp and monitor 

Did you know that EQ”s were invented for phone systems ?

best

gino
On Thu, Jan 10, 2013 at 2:28 PM, <fdoddy@aol.com> wrote:
 
>  
>sorryfor the typo..it's u-law...
>
>
>fritz
>
> 
>
> 
>
>  
>-----Original Message-----
>From: fdoddy <fdoddy@aol.com>
>To: newmellotrongroup <newmellotrongroup@yahoogroups.com>
>Sent: Thu, Jan 10, 2013 2:16 pm
>Subject: [newmellotrongroup] off topic help
>
> 
>   
> 
> 
> 
>Folks,
>
>I am trying to format a file for a client for their music on hold.  Their conversion spec is 8bit/8khz mono .wav (u-plaw).
>
>I have been unsuccessfulin having this sound reasonable after it goes into their AVIA phone system due to the GSM compression.  I can get the converted file to sound reasonable, but once it's out of my hands and actually in the system it sounds like shit.  I realize there is a good deal of degradation due to the GSM compression, but am at a loss what to do to improve the quality.  Anyone have any experiencewith this and have any tips?
>
>Thanks,
>
>fritz
>         
-- 

Gino Wong Birgelo
BSComm, BSEE, 
ReRED Recording, Analog Sound Design
Audio Mastering, Recording & Restoration, Logistics 

Ginowong@gmail.com