[maemo-developers] FM RDS data

[From: Martin Grimme]

Hi,

yes, RDS PS and RDS RT can be modified. See

http://wiki.maemo.org/Documentation/Maemo_5_Developer_Guide/Using_Multimedia_Components/FM_Transmitter_API_Usage


Martin


2010/1/7, Benoît HERVIER <khertan at khertan.net>:
> 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/
>