[maemo-developers] FM RDS data

[From: Benoît HERVIER]

About FM and RDS modifying RDS signal transmited from the tablet is possible
?

I'm thinking of a small usage, a app that found the freest frequency (by
listening fm with the transmitter) and change the frequency of transmitted
music to the found one and send an rds signal by the transmitter, so you
don't have to change frequency on your car receiver (or everything else).

I know that fm transmitter emit an rds signal ... but can that be changed ?

Does there is documentation about the fm transmitter and receiver somewhere
on Maemo ?

Thanks a lot

2010/1/6 Martin Grimme <martin.grimme at gmail.com>

> Hi,
>
> the FM receiver's interface for RDS is exposed via sysfs. So any
> application can read RDS data from it.
> The frequency bands the receiver is capable of are US/EUR (87.5 -
> 108.00 MHz) and Japan (don't remeber, but I think starts somewhere at
> 70 MHz). A region switch in the driver (sysfs-Interface again but as
> root) switches between the frequency bands.
>
>
> Martin
>
>
> 2010/1/6, Aldon Hynes <Aldon.Hynes at orient-lodge.com>:
> > I have been approached by a person interested in sending data from a
> sensor
> > via FM to a cellphone which would in term transmit this data to the
> > Internet.  I am interested in figuring out if this is something that
> could
> > be done with an N900.  With that, I have a few specific questions:
> >
> > First, can anyone point me to information about how to programatically
> > receive RDS data?  I've read that the FM receive app is supposed to do
> that,
> > but I haven't managed to receive RDS data that way yet, and I don't have
> the
> > source code.
> >
> > Second, does anyone have any idea what frequencies the FM receiver can
> tune
> > into?  The programs I've seen have focused on the traditional commercial
> FM
> > band, 88 Mhz to 106 Mhz.  Can the FM receiver tune in higher or lower
> > frequencies?  If so, what is the real frequency range of the FM Receiver.
> >
> > Third, are there other data formats that can easily be sent and/or
> received
> > from the Nokia phone?  If so, can people point me to any of these other
> data
> > formats?
> >
> > Any help you can provide would be greatly appreciated.
> >
> > Aldon
> >
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> >
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-- 
Benoît HERVIER - http://khertan.net/
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