[iyonix-support] Re: Recording on line-in: silent right channel
- From: tennant@xxxxxxxxxxxxxxxxx (Tennant Stuart)
- To: iyonix-support@xxxxxxxxxxxxx
- Date: Sat, 16 Feb 2008 00:47:26 +0000
On Fri 8 Feb 2008 (20:54:08), rogerarm@xxxxxxxxxx wrote:
>On 8 Feb 2008, Tennant Stuart wrote:
>> On Thu 7 Feb 2008 (07:52:47), Roger Arm wrote:
>>>On 6 Feb 2008, Steven Simpson wrote:
>>
>>>> I've piped the 'VCR out' from my hi-fi to the Iyonix's Line-in (2
>>>> phonos to stereo jack), and been using !AudioIn to record at
>44100Hz
>>>> stereo, with the intention of digitising some old LPs.
>>
>>> I wouldn't do it like that if I were you, unless your old LPs are
>>> really awful in sound quality.
>>
>>> The resulting sound quality you will get by doing this (in
>>> single-channel stereo, or proper stereo) will be appalling. There is
>a
>>> glitch in the ADC chip within the Iyonix that prevents accurate
>>> sampling at 44.1kHz.
>>
>> Why have we been saddled with such a crap sampling chip?
>
>Rhetorical question?
No, I'd really like to know what happened.
>>> It will accurately sample at 48Khz, but then you will need to
>>> down-sample the result to 44.1kHz, which if you do it quick and
>nasty,
>>> will still result in nasty artifacts. If you do it with a more
>>> accurate down-sampler, it will take ages - far far slower than real
>>> time.
>>
>> How many times slower is "far far"? Twice? Ten times? Hundred?
>Million?
>
>Try it and see if you must. I have already advised against.
>
>I'd say of order 10 times slower. Note : order.
x10 isn't too bad if you can leave the computer to get on with the job.
>>> But even if you do all the above the best possible way on the
>Iyonix,
>>> the result will still be disappointing; the noise level will be
>fairly
>>
>> What about one of the very clever people on this esteemed mailing
>list
>> writing an "upsampler" like a good video upscaler? This would double
>> the apparent sampling rate to 96kHz, while taking out interference.
>
>This would not do much for non-linearity within the ADC, nor for many
>of the other artifacts present in cheap ADC 'chips'.
I guess any non-linearity could be compensated for quite easily.
>>> high, and there may well be other nasty and unexpected sound
>artifacts
>>> caused both by using a poor ADC in close proximity to an
>(electrically
>>> noisy) computer.
>>
>> Is it possible to screen the chip? Move it? Upgrade to a better one?
>
>It is not a separate chip: the ADC is integrated into a big chip with
>a multiplicity of other functions within the Iyonix. There is no
>separate dedicated ADC chip within the Iyonix.
Ooooh, big bit of information there! I didn't know that.
>>>I use a recording HiFi CD player to transfer my records.
>>
>> Not very useful for old LPs.
>
>On the contrary, it is VERY useful.
>If you are transfering LPs, you already have an LP player. Plug the LP
>player into your pre-amp, and the output from that into the HiFi CD
>recorder. Place in a CD-R disc in the HiFi CD-R recorder, press
>'record' and away ye go. Very useful, why otherwise would I have
>suggested it?
Whoops, I thought "transfer my records" meant "CD to Iyonix". :)
Tennant
--
_ ________________________________________
( _ .|_ ||_ _ |_ /
_)(_)(_)||_)||_ ( )|_ / Why does *he* get to use his name?
______________________/ tennant@xxxxxxxxxxxxx
---
To alter your preferences or leave the group,
visit //www.freelists.org/list/iyonix-support
Other info via //www.freelists.org/webpage/iyonix-support
Other related posts:
