Audio output is very simple.
SPDIF is explained there too :
http://scanlime.org/2011/04/spdif-digital-audio-on-a-microcontroller/
and asking Google for "spdif vhdl" returns several results.
All one has to bother with is the actual kernel interface and
buffering.
Furthermore, many many systems are supported by ALSA and others.
Le 2012-12-08 05:17, Joel Rodriguez a écrit :
On 12/08/2012 01:37 AM, Gregory Carter wrote:
As for the Audio card, and the state of Linux audio....
One fpga pin (for stereo) and draining some bit-rate from the
PCI/PCIe interface should work,
for audio 44/96/192 KHz and 24-bit connected through a SPDIF opical
toslink suffices for audiophile
quality (difference in audio bits is like in 16bpp/24bpp in vga, CD
quality is 16-bits). Then user
can connect external (preferred) DAC/headphones/amplifiers, this
way avoiding (subjective) quality issues.
for an example of external multi-rate optical DAC see:
http://www.amazon.com/FiiO-Digital-Analog-Audio-Converter/dp/B005PWPUW6
Joel
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