More detail of what's in the service subchannel? (if available)

[Geek648]

I believe that - for example - an 88kbps station's subchannel doesn't necessarily mean that all 88kbps is for audio - some will be taken by slides (2 or 3kbps?) and text - meaning that the actual audio bitrate is around 84kbps? Is it possible to show the exact bit rate used by the audio and separately the bit rate for slides etc.? Thanks

[KejPi]

This is somehow related to #200 with the same comment from my side.

[Geek648]

I had a feeling you'd say that :)
Never mind, it's 90% a great tool for analysis of DAB, just a shame all the radios and software lie a bit about the audio bitrate.
Thanks anyway

[KejPi]

It is not a liyng, it is the capacity of subchannel that is shown and it is marked as Service bitrate - Audio & Data in AbracaDABra. Nevertheless, I think it would be possible to calculate real audio and data rate.

[KejPi]

After review, I think it is not a big problem to calculate audio and data rate of the service. The only remaining question is where to show this information. Any idea?

[andimik]

In ensemble information?

[Geek648]

Thanks for reconsidering, much appreciated - it will make this the absolute perfect tool for my needs, and I can't be the only one...?

In an ideal world I'd manage to persuade you to create a new Audio Window with level meters and all the lovely info there :)
How about in the tool-tip when we hover over the bit-rate in the main window? Seems like the perfect place - the service bit-rate is on show all the time, the tool-tip can show a breakdown of audio vs SLS vs text ..?
Thanks

[KejPi]

I will go with proposal from @andimik Next version of the app will show Audio/PAD bitrate for selected service in Ensemble info dialog.

[KejPi]

Implemented in 3.2.0

[andimik]

Yes, error correction.

[KejPi]

It is super frame header and error protection
There is an interesting table in Annex E here http://www.etsi.org/deliver/etsi_ts/102500_102599/102563/02.01.01_60/ts_102563v020101p.pdf

[andimik]

This is - indeed - a very interesting table. Thanks!

[Geek648]

I've noticed the audio/PAD bitrates varying on French ensembles, that means that Variable Bit Rate audio is in use I presume? The French service rates are 88k but I've seen one with audio as low as 64.7 at one point, varying up to 69. Some ensembles are set up with relatively fixed PAD rates of about 8k leaving audio at ~72 (the national M1/M2), whereas others have higher PAD rates and lower audio ones (local/"etendu") muxes.

[Geek648]

Just seeing how image pasting works

[andimik]

BTW: I just have checked some 48 kHz HE-AAC services, but AbracaDABra shows the value for the 24 kHz column. Then I remembered that HE-AAC (no matter if v1 or v2) is half of the sampling rate.

So, everything ok here :-)