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-   -   2020 Up-to-date codec situation (http://www.drmrx.org/forum/showthread.php?t=2937)

PhilipOneL 13-03-2020 11:19

2020 Up-to-date codec situation
 
I have received an email from a Chinese supplier asking whether I am interested in purchasing a number of a DRM radio receiver sets that he has. However, I am unsure of what the requirements are now, in 2020, for reception and full decoding of current (and expected) broadcasts. He has not yet given me enough information even for me to say what brand/model they are.

That he is being somewhat crafty make me think it is old stock. I don't want to even think about buying a set that won't decode the most up-to-date broadcasts. (Mind you, owning three DRM sets already, I am not sure I want to buy another at all! :) )

Could someone please outline for me what the codecs are that a current receiver must have?

Philip

tpreitzel 13-03-2020 14:08

Philip,

The current standard specifies AAC+ and xHE-AAC . Always be wary of such offers.

PhilipOneL 13-03-2020 23:23

Thanks. I will ask specifically about that.

PhilipOneL 16-03-2020 10:21

Are AAC+ and xHE-AAC synonyms? (In searching around for information, I am left with the impression that the first is a *brand name* for the second.)

By the way, my would-be supplier in China has sent me a link to a review of the Gospell GR-216, but with no direct information either on the codecs installed, or the firmware his sets are loaded with. Hmmm.

AF4MP 16-03-2020 16:26

Quote:

Originally Posted by PhilipOneL
Are AAC+ and xHE-AAC synonyms?


No. AAC (Advance Audio Coding) is one of the audio coding format standards.

Very simply, HE-AAC (High Efficiency Advance Audio Coding) is an upgrade to AAC. This is sometimes termed AAC+.

xHE-AAC (extended High Efficiency Advanced Audio Coding) combines HE-AAC with MPEG-D.

There are may references on the web, here is one:
https://en.wikipedia.org/wiki/Unifie...d_Audio_Coding

tpreitzel 16-03-2020 22:18

Quote:

Originally Posted by PhilipOneL
By the way, my would-be supplier in China has sent me a link to a review of the Gospell GR-216, but with no direct information either on the codecs installed, or the firmware his sets are loaded with. Hmmm.


As Zygmunt stated, the two codecs are related but not identical. The GR-216 should be capable of decoding both codecs, but beware of problems with the quality of the GR-216. I received a lemon which Gospell failed to fix under warranty since their terms for doing so were unacceptable. You just may get enough lemons to make lemonade, but not much else. Again, beware as I eventually trashed my GR-216. As far as firmware, I can't remember the exact revision, but Alokesh Gupta had posted a link to the firmware... in 2019, I think?

Digger 17-03-2020 06:47

Hi,
My Gospell:
HW: GR-216-V5
SW: 1.4 build633M
FW: 13.0.0_909_3356

And it plays xHE-AAC as well as HE-AAC.

@Philip: Would you sell the boards for the Avion to me?

PhilipOneL 25-03-2020 18:48

Thanks for all the advice. His price, especially given the conversion between CAN and US dollars, is too high for me -- nearly CAN$600 including all the shipping, brokerage, bank fees and the like.

Terje, I am hoping that a young techie friend of mine will be able to do the job, but she won't have a chance until after the pandemic passes. If I still have them uninstalled in the summer, I'll let you know.

Philip


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