16-Bit Sound Working on IBX100

[meeeee mongo]

Another google post from
<ra.barrett@bigbluesky.uk.net> (fladda) : 


>> I finally got around to installing the components into my Bush
>> Internet Box (IBX100) to get the 16-Bit sound working. Seems to be
>> able to play MP3s OK using the new (excellent) FP Amplayer module.
>> Amplayer have released a module specifically for the ARM 7500FE using
>> the floating point instructions. Seems to work OK using stereo
>> 128k/44.1 MP3s. However, playing MP3s uses just about all of the
>> available processing power of the ARM7500FE (as expected).

>> Cheated a little on installing the components, as I used a 16-bit
>> RiscPC soundcard, which contains all the circuitry that is missing on
>> the Bush Boxes. I fixed the 16-bit sound card using a 90 degree
>> two-pin header, mounted in two of the 'holes' that were intended for
>> the sound output on the IBX PWB.

>> 16-bit RiscPC soundcards use a six-pin header. Necessary to solder 5
>> (or 6) wires to the IBX PWB, to tap-off the digital sound, and feed
>> the 11.xxxx MHz clock to the ARM 7500FE.

>> Sound works (as expected) just like my RiscPC, apart from the reduced
>> power of the ARM 7500.

>> Incidentally I added an SPDIF interface to my RiscPC a year or so ago,
>> using a Scenix 8-bit processor to convert the 16-bit date from the ARM
>> to the 16-bit SPDIF format. When I'd got this working, I realised that
>> I could have used an off-the-shelf IC from Crystal to do this
>> conversion ! I might also add a TOS SPDIF interface to my Bush Box.

>> I will add more details describing how to get the sound working on the
>> IBX later...

>> Ralph

The rest of the thread is at ...

http://groups.google.com/groups?th=cdc7581d7fc0119d


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