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Interfacing monitors to a digital network in studio

opto, modified 13 Years ago.

Interfacing monitors to a digital network in studio

Padawan Posts: 31 Join Date: 5/10/09 Recent Posts
Would it be thinkable to design a "Genelec modell 10101 "DiGtionary" -module that would be an "ATF -scrutinizer"
i.e. "Audio- and Time- format translator" -module which would be "fluent" in languages like HE-AAC, Dolby-E, etc.
etc. and also all time formats for syncing?
christophe-anet, modified 13 Years ago.

Re: Interfacing monitors to a digital network in studio

Jedi Knight Posts: 188 Join Date: 3/23/09 Recent Posts
Hello,

Thanks for your post and question. Please find an answer from Dr. Aki Mäkivirta, Genelec R&D Manager for DSP products.

HE-AAC is a lossy audio compression scheme. Dolby-E is an audio compression scheme intended for professional applications. To be able to accept audio data in these formats in a loudspeaker implies that the loudspeaker contains a decoder function for these formats.

The natural location for the decoding is a function of the audio source, or a player. Usually the audio source supplies the audio signal either as an analog line level voltage output or in one of the uncompressed digital audio interface formats (AES/EBU for professional applications, SPDIF for consumer applications; either may in principle also be driven on an optical link such as TOSLINK).

Also time code processing and time synching are usually functions for the player device. The latency in the analog uncompressed digital audio transmission are small enough to be insignificant. Although it is technically possible to design these functions inside a loudspeaker, it is useful to ask why one should do so?

Could you please explain why the decoding and time sychning functions are particularly useful if built inside a loudspeaker instead of a player device as they are today? If these formats are supported what all other formats must then be supported as well and why? Thanks in advance.

GENELEC
Aki Mäkivirta
R&D Manager, DSP Products
opto, modified 13 Years ago.

Re: Interfacing monitors to a digital network in studio

Padawan Posts: 31 Join Date: 5/10/09 Recent Posts
Thanks for Your clear and informative reply, it solved all the unknowns I had of that issue. Actually my main motivation for posting the question was to learn exactly those facts that You gave in your reply. ThankYou!

..."Could you please explain why the decoding and time sychning functions are particularly useful if built inside a loudspeaker instead of a player device as they are today? If these formats are supported what all other formats must then be supported as well and why?" (your enquiry)

To answer I would imagine that not every supplier of source devices is interested in achieving a "fully digital" high definition signal chain. That implies possibly sub-standard converters and clocks (who knows?). Could it be that by implementing those functions in the loudspeaker, there would open up the possibility of eliminating the accumulated jitter (causing noise possibly) and for instance up-sampling the signal. But I understand that too much latency is not desirable. On the other hand a good loudspeaker would also uncover the short-comings of lossy signals and be a guality-assurance device in that respect of the whole signal-chain. Besides, by implementing those functions in an optional DSP-card that could be plugged to the loudspeaker chassis Genelec could produce application specific solutions and get additional customers! Think of your sales figures if Genelec had every thinkable and upcoming format covered with a plug-in card! You could make them here in Oulu!
ilkka-rissanen, modified 13 Years ago.

Re: Interfacing monitors to a digital network in studio

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Warm thanks for your suggestions to improve Genelec products. We will certainly carefully evaluate your suggestions.

GENELEC
Aki Mäkivirta
R&D Manager, DSP Products
opto, modified 13 Years ago.

Re: Interfacing monitors to a digital network in studio

Padawan Posts: 31 Join Date: 5/10/09 Recent Posts
You are more than wellcome. Have a refreshing summer. Best Regards Olli