[LAU] hda_codec_analog 96000 sampling rate?

[Mark Rages]

On Mon, Nov 29, 2010 at 4:41 PM,  <fons at kokkinizita.net> wrote:
> On Mon, Nov 29, 2010 at 04:33:49PM -0600, Mark Rages wrote:
>
>> On Mon, Nov 29, 2010 at 4:29 PM,  <fons at kokkinizita.net> wrote:
>> > On Mon, Nov 29, 2010 at 04:09:25PM -0600, Mark Rages wrote:
>> >
>> >>  - I have an AD1986A codec chip on my motherboard.
>> >>  - According to its datasheet, AD1986A supports 96 kHz sample rate.
>> >>  - /proc/asound/card0/codec#0 doesn't list 96 kHz.
>> >>
>> >> Why?
>> >
>> > Because:
>> >
>> > * A particular HW design does not have to support everything
>> >  a chip could do.
>> > * A driver does not necessarily support all hardware features.
>>
>> I'm using the Alsa driver as set up by Ubuntu.  Would the OSS driver
>> be a better choice?
>
> No. To generate the analog signal to modulate an FM transmitter
> for stereo you need at least 53 kHz usable bandwidth with a flat
> amplitude respnse and perfect linear phase. The minimal practical
> sample rate would be around 120 kHz. No audio interface I know of,
> not even those work at 192 kHz, can do this.
> You'd need an 'instrumentation/laboratory/scientific DA converter
> for this to work at all.

Right.  I just want the pilot tone.

You are saying the 192 kHz soundcards roll off supersonic frequencies
between the DAC and the output jack?  Or something else?

Regards,
Mark
markrages at gmail
-- 
Mark Rages, Engineer
Midwest Telecine LLC
markrages at midwesttelecine.com