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RDS Spy compatible 192 kHz sound cards

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22:13
2014/10/09


DaveB

Could you just confirm that you HAVE to have a soundcard (192kHz) in order for the direct RDS decoding function. Looking at some posts on forums there is confusion that using VAC gives you a virtual soundcard and you don't need any hardware.

It probably arises because there is no detail in the audio specs published in the manuals that come with the PC. The HD audio specs refers to multiple stereo ADCs. in the case of the ACL889 codec – three and a stereo microphone convertor

In my happy ignorance I've been running one instance of RDSSpy directly decoding from HDSDR via VAC and another instance of RDSSpy decoding the RDS from an analogue tuner feed clock/data into the mic input of the same laptop. Then I cascaded another VAC to give a second VAC line – and fed a third instance of RDSSpy !

Rgds

David
Sittingbourne

18:50
2014/10/10


admin

posts 75

David, you don't need a hardware soundcard if you use VAC (Virtual Audio Cable), of course.
That was the original VAC purpose, to add a new soundcard device to the system. Applications don't recognize between hardware and virtual soundcards. There's a device driver in both cases that ensures visibility and accessibility of the device. Applications communicate with the device driver, not with the hardware directly.
Finally, I feel important to mention that VAC cannot enhance capabilities of hardware soundcard, that means, if you want to decode RDS directly from external mpx tuner, you still need a 192 kHz hardware soundcard.

11:34
2014/10/11


DaveB

Hi,
Thanks for the reply. Just to make it clear – I have integrated HD audio sound on my laptop using the Realtek chipset.

So I have two instances of RDSSpy running simultaneously decoding separate RDS signals through the one soundcard. First instance is using Clock/Data signals into the mic input of the laptop and the second instance is direct mpx decoding with the audio coming from HDSDR via Line 1 (VAC).

I have simulated a total of three instances of direct mpx decoding simultaneously through the integrated soundcard at the same time by generating additional VACs. And still decoding a separate stream through the mic input at the same time. It wouldn't let me add a fourth direct mpx input with a 4th VAC.

Which fits in with what is published with regard to the latest HD Audio codec from Relatek. There are internal inputs [accessible with VAC] and they handle up to 192kHz sampling – but the internal mic input is filtered and cuts off at 48 KHz – even though the sampling rate can be set to 192kHz.

I'm hoping someone with an Elad FDM S2 will try my suggestion to confirm we really do have three independent ADC inputs.

Rgds

David
(logged as guest)

13:58
2014/12/04


Peter W.

I can run rdsspy by simply feeding the audio from the "line out of my Sony ICF-S7600GR into my MSi Wind U270 notebook (Realtek HD).

tutorial here

Peter

13:45
2015/06/11


Matt

Hi. We have logging systems using FM Tuner Cards that support RDS. Each tuned radio station shows up as a soundcard channel in Windows. What settings would I require to decode the RDS on these channels with RDS Spy? None of the preset methods seemed to work when I tried them.

Thanks

17:02
2015/06/11


admin

posts 75

Matt: That configuration will not work because these tuner cards provide only Left and Right audio channels at low sampling rate so there is no RDS or its residues. Since I don't know the communication protocol these cards use, I don't have any solution.

11:40
2016/07/19


ctonin

Hi guys,

somebody has used AUDIGY FX with RDS Spy?

Many thanks

12:29
2016/07/19


admin

posts 75

It seems the Audigy FX supports only 96 kHz sampling rate for recording. Thus it cannot be used for RDS decoding.

21:34
2017/11/05


Stef

Hi all,
I've tried to extract mpx output from car radio Blaupunkt Valencia MP36 : pin 53 – TDA 7540B datasheet : http://www.st.com/content/ccc/…..108485.pdf
sound card is Xonar D2X 192 KHz, but no result … Frown
Someone can help me ?
Thanks

20:31
2017/11/10


admin

posts 75

Post edited 20:31 – 2017/11/10 by admin


The Xonar D2X should work well. Use some audio recording/editing software (for example GoldWave) to verify that you can really see the MPX signal. Using a FFT spectrum function, it should look like this:
http://pira.cz/art/mpxtun3.gif

13:34
2017/11/12


Stef

Hi admin,

On Line input of Asus Xonar D2X, nothing after 25 KHz, only L+R & Pilot :
On Asio input, audio band complete with Rds Data :

But, how to connect Rdsspy to Asio input sound card … ?

13:35
2017/11/12


Stef

13:38
2017/11/12


Stef

Sorry I cannot post link to Spectrum Lab picture on the same post …
This is SL picture on input line
http://f-10255.pagesperso-oran…..e.fr/SL002

12:35
2017/11/13


admin

posts 75

RDS Spy currently does not support ASIO interface (and it's a question if such a support will ever be implemented as Jan is very busy). Maybe you'll find a driver for your sound card with 192 kHz support.

17:04
2017/11/13


Stef

Thanks for the info ! Blaupunkt Valensia MP36 has a Rds chip TDA 7333 ; datasheet :
http://www.st.com/content/ccc/…..202356.pdf

It will be OK with data (pin 13) and clock (pin 11) ? this chip is not listed on the rdsspy manual.
Thanks in advance.

08:01
2017/11/14


admin

posts 75

The TDA7333 does not output raw RDS clock and data. There's an internal RDS preprocessor and the communication is either 1 MHz SPI or 400 kHz I2C. This is unfortunately not readable by common PC.

18:21
2017/11/14


Stef

Many thanks for all the infos. i will try Rdsspy another time …

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RDS Spy compatible 192 kHz sound cards

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