How to record very faint sound from the analogue input?

[Tortise]

----- Original Message ----- 
From: "Colin Law" <clanlaw at googlemail.com>
To: "Ubuntu user technical support, not for general discussions" <ubuntu-users at lists.ubuntu.com>
Sent: Tuesday, March 09, 2010 9:51 PM
Subject: Re: How to record very faint sound from the analogue input?


> On 5 March 2010 18:59, Dotan Cohen <dotancohen at gmail.com> wrote:
>> I need to record a phone conversation, but the sound from the analogue
>> input is so weak that recording and playing back in Audacity I hear
>> almost nothing. How can I either boost the playback or (even better)
>> boost the input so that the file is recorded in a hearable way?
>
> This thread seems to me to be getting a bit out of control with talk
> of building amplifiers and so on.  Can we go back to the beginning and
> try again.  Where exactly is the signal coming from in the first
> place?  A quick glance back through the thread does not seem to
> discussed this, but apologies if I missed it.
>
> Colin

I agree.  I'd also observe that a correct functioning mic input is extremely sensitive.  Assuming you have a correct mic in config 
the signal would have to be VERY faint to not be useful.

How exactly are you trying to record the phone conversations?

Talking through a SIP device /service / interface might allow mp3 recordings e.g. see PBX in a flash.