Re: 5.1 interfaces.
Re: 5.1 interfaces.
- Subject: Re: 5.1 interfaces.
- From: Bill Stewart <email@hidden>
- Date: Fri, 11 Oct 2002 17:15:58 -0700
on 11/10/02 4:42 PM, Brian Willoughby wrote:
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Mark Cookson <email@hidden> wrote:
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[ The M-Audio Sonica, a USB to S/P-DIF device, will let you output
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[ AC-3 to your home stereo decoder via its optical output.
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I just heard about the M-Audio Sonica, but there doesn't seem to be enough
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in-depth information on their site or in their press release. Does this
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device
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*create* an AC-3 stream from 6 discrete PCM channels sent to CoreAudio? ...
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or does it merely pass through an AC-3 stream that already exists - e.g. from
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a
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DVD soundtrack file?
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The Sonica also claims to "support" DTS, but I could not determine whether it
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will create / encode DTS or merely pass it through like a consumer DVD player
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with DTS support.
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What I would like is to be able to line up six tracks of PCM audio in Logic
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Audio Platinum, and play it through some device which will encode to DTS
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(rarely would I choose AC-3) to my surround decoder which accepts PCM, AC-3,
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and DTS.
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Will CoreAudio ever have converters / encoders that accept 6 channels (or 4)
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and output a stream in DTS or AC-3 (CBR)? Will there be control over bit rate
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- e.g. DTS supports 1536 kbps (48 kHz), 1411.2 kbps (44.1 kHz), and 768 kbps
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(half-rate DTS for DVD with 5.1 AC-3 sharing the limited bandwidth).
Great 3rd party opportunity, and one that I'm sure many people would
welcome:) We have an API in Jaguar (AudioCodec) that of course can do this
kind of thing.
Bill
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[ The emagic emi 2|6, a USB device, has 6 outputs which would allow
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[ you to output 6 channels of PCM audio to anything that accepts
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[ line level inputs.
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Theoretically, the EMI 2|6 should support DTS and AC-3 if you hand it a
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pre-encoded stream at the right bit rate. There are S/P-DIF in and out
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connectors which I use almost exclusively. It seems that a software DVD
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player
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could leverage the eMagic hardware to output 5.1 to an outboard decoder. I
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don't think the EMI 2|6 supports the half-rate DTS clock rate, though, but I'm
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sure they could add that with a firmware driver update. Of course, if you're
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happy with 24-bit analog outputs, and have a software decoder, the EMI 2|6
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could certainly handle driving 5.1 analog inputs on a surround system.
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Brian Willoughby
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Sound Consulting
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