what's up?

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what's up?

Postby uncletodd » Sun Jun 14, 2009 2:17 am

just wondering if there is anything new in the pipeline as far as updates/upgrades ....it's been a year since the last one---just being curious :wink:
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Postby Derek » Sun Jun 14, 2009 8:54 pm

Hello

Yes, I am working on an update. The main change will be support for 24-bit and 96kHz sampling. A beta should be available in a few weeks.
Derek Higgins
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http://www.wavecor.co.uk
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Postby Glenn » Thu Jun 18, 2009 12:27 am

Hi Derek,

This is exciting news - didn't you have to do a complete re-write of the code for 24-96?

It would be helpful if WC included support for hi-fi downconversion to 16/44 on the output files (optional, of course).:D

Regards,
Glenn
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Postby Derek » Thu Jun 18, 2009 9:32 am

Hello Glenn

Yes, when I said 'complete re-write' that was perhaps a slight exaggeration :)

However, it is requiring quite extensive changes as you can imagine. A large part of the problem is that the program's internal processing assumes 16-bit addressing of the data samples. Moving to 24-bit makes it much more complicated to keep track of where you are!

I agree that the option to down-sample (or up-sample) the output files would be welcome and I'll do this if it doesn't prove too difficult.

all the best
Derek Higgins
Wave Corrector Developer
http://www.wavecor.co.uk
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Postby Glenn » Tue Jul 14, 2009 11:53 pm

I'm excited to hear you're planning on updating wavcor's capabilities, Derek, especially now since I've been making moves in the same direction, including a new OS (winxp - finally! :)), dual core processor, and a 1TB drive - large enough for a few records, at least.

Until the playback devices catch up, most of us will still be saddled with 16/44 playback equipment, and I'm wondering how you're planning on addressing the downconversion when outputting the wav files. In reading how musicians are self publishing their works, I understand that bit reduction is a relatively simple matter of truncating the least significant bits, and that the tricky part involves avoiding alias artifacts when reducing the sampling rate. For these reasons it is recommended that 24/16 be used when recording.

I'm curious to know how you plan on dealing with the problem of aliasing, and if wavcor's new recording capabilities will include 24/16?

Regards,

Glenn
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Postby Derek » Wed Jul 15, 2009 9:16 am

Hello Glenn

In its current state of development, there aren't any re-sampling options. The program simply outputs files using the same sample rate as the input files. The recorder has additional options to record up to 96kHz and 24-bit.

My current thoughts are to restrict up/down sampling to a 2:1 ratio; ie 44.1 to/from 88.2 and 48 to/from 96. This is relatively simple to implement and avoids all the aliasing problems you allude to. For more complicated conversions I would recommend the free program SSRC; see

http://www.softpedia.com/get/Multimedia/Audio/Other-AUDIO-Tools/SSRC.shtml

This can be easily integrated with Wave Corrector by setting it up as an 'External Encoder'. It produces excellent results as can be seen on this site:
http://src.infinitewave.ca/

The develpoment is coming along quite well. I thought the beta was ready for release a few days ago but then I discovered some issues I'd overlooked. :(

However, it shouldn't be long now.

all the best
Derek Higgins
Wave Corrector Developer
http://www.wavecor.co.uk
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Postby Glenn » Thu Jul 16, 2009 11:59 pm

Hi Derek, thanks for the links. The infinitewave site in particular is quite illuminating.

Cheers,

Glenn
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