Re: [Drm-devel] 回复： xHE-AAC for Dream

[Stefano M. <ste...@gm...>]

Hi All;

I am no C++ programmer, but I am a HAM with a very special interest in
DRM30 and DRM+ and DReaM; I strongly believe this is *the *future of radio.

I am trying to "build" a simple and cheap HW+SW box that would empower
small broadcasters to materially go on air using Digital Radio in the form
of DRM*;

this will have a stereo input (2 x RCA) and an audio RCA output to feed a
modulator or some sort; likely the audio input of an AM SW TX, recycled
from HAM use.

to this end, I am experimenting with DReaM running on Windows.

Why Windows and not Linux?

Simple; the vast majority of would be Broadcasters will not, most likely,
have any experience with Linux, likely neither ever had a PC running Linux,
and using Linux would mean for them a steeper learning curve.

Windows, which I do not particularly like by the way, on the other hand is
omni-present; sourcing a second or third hand PC running some sort of WIN
-XP or W7 is extremely easy and cheap, and anyone knows how to use it.

Put it simply, using DReaM under Windows, takes away one element of
difficulty, as the underlying O.S. does not need to be learned before
actually using DReaM and potential broadcasters do not need to pay a tech
to set it up.

On the HW side of things, few HAMs worldwide have been experimenting with
modified HAM rigs, I am in the meantime experimenting with *cheap as chips*
433 Mhz modules; I'll keep you posted about how it goes ....

I urge you C++ Programmers / Gurus to please come up with a working xHE-AAC
encoder, so that DReaM can be used in TX mode to actually transmit in
xHE-AAC..

73,

Stefano VKJ6WFM.





On Tue, Oct 9, 2018 at 8:58 AM Rafael Diniz <ra...@ri...> wrote:

> Wow, did not know that, I can see lots of USAC:
>
> https://android.googlesource.com/platform/external/aac/+/master/libAACdec/src/
>
> May be we have it?
>
> Rafael Diniz
>
> On 10/08/2018 09:43 PM, zhongfanyang via Drm-devel wrote:
> > Hi, Julian.
> >
> > From https://www.iis.fraunhofer.de/en/pr/2018/20180608_AME_Android.html
> >
> > Fraunhofer’s xHE-AAC Audio Codec Software Extends Native AAC Support In
> > Android P For Better Quality At Low Bit Rates
> > / 8.6.2018
> >
> > and Android development package FDKv2 from
> >
> > https://android.googlesource.com/platform/external/aac/
> >
> > I don't know how relevant it is to DRM xHE-AAC decoder, and I'm NOT
> > familiar with Android tool kit. Maybe you can take a look and see if it
> > can be used/ported to our project? Thanks!
> >
> > zfyoung
> >
> >     ------------------------------------------------------------------
> >     发件人：Julian Cable <jul...@bb...>
> >     发送时间：2018年10月8日(星期一) 22:17
> >     收件人：List discussion <drm...@li...>
> >     主 题：[Drm-devel] xHE-AAC for Dream
> >
> >     Hi Rafael,
> >
> >       David Flamand added a plugin architecture for audio codecs as part
> >     of the support for the Opus codec so it should be quite straight
> >     forward to add an xHE-AAC codec.
> >
> >     I’m not aware of an open source codec but if Fraunhoffer could make
> >     something available, either open source or a shared library we can
> >     dynamically link to then we can plumb it in.
> >
> >     Something to talk to Alex Zink <ale...@ii...>
> about.
> >
> >     Julian
> >
> >
> >
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