if you have gain selectable at 10 db intervals over a 60 db range, i see no=
need for gain trimming at all. any small corrections can be done post, wit=
hout losing either sn or dynamic range (the reason one struggled so much wi=
th levels in the analog days.
=A0
four channels would be nice, to do nature recordings in ambisonics.
=A0
umashankar
i have published my poems. you can read (or buy) at http://stores.lulu.com/=
umashankar
>________________________________
> From: Avocet <>
>To:
>Sent: Friday, June 1, 2012 6:48 AM
>Subject: Re: [Nature Recordists] Homebrew Recorder
>
>< I've sort of settled on the following spec. and was hoping the
>> group could give it the once over and make any suggestions re- >
>> omissions / alternatives etc.
>
>Rob,
>
>While you are at it, aim for something which is not curently available
>and more than 2 channels.
>
>My immediate comparison would be with an SQN mixer running into a
>stereo recorder. I've used SQN mixers since they came out decades ago
>and their spec is high. My first change would be to have four inputs
>as I am using four at the moment with alternative stereo mic pairs.
>
>> switchable front end gain 30/40/50/60dB
>
>And line in 100mv and +12 balanced.
>
>> 2 x analogue fader control. mute to +20dB(gangable for stereo)
>
>Fader 1 ganged L/R with fader 2 pan. Configurable as M-S.
>The other two inputs could have phase switching.
>
>Alternatively make all level controls electronic/digital and
>configurable to all of the above.
>
>> separate MS decoders for input and headphones (width control on
>> input)
>
>And line out. Software control of in/out signals can make this fully
>configurable.
>
>> analogue peak limiter (gangable for stereo)
>
>Make this digital. With 24 bit, a limiter is redundant as you can have
>several bits of headroom. For those rooted in analogue recording,
>provide a limiter but one which can be "undone" digitally. Avoid a
>hole after a peak by making recovery fast which is possible digitally.
>
>> pre-record buffer (5 sec. ?)
>
>1 minute to 10 minutes. Think big.
>
>> internal solid state drive 128 GB (FAT32)
>
>Pluggable?
>
>> 2 x XLR-3F audio in
>
>4 as above.
>
>Alternatively, make it stackable to a number of stereo pairs under a
>single sync control. Top layer controls whole stack.
>
>> -40 / +80 deg.C operating temp.
>
>And water/rain resistant. Much more important than 80 C.
>
>David
>
>David Brinicombe
>North Devon, UK
>Cogito cogito ergo cogito sum - Ambrose Bierce
>
>
>
>------------------------------------
>
>"While a picture is worth a thousand words, a
>sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
>
>Yahoo! Groups Links
>
>
>
>
>
>
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