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FS#6124 - DSP Enable/Defeat for Optical Out

Attached to Project: Rockbox
Opened by Bob Gordon (ReliquaryOle) - Friday, 06 October 2006, 09:19 GMT+1
Task Type Feature Requests
Category Music playback
Status Unconfirmed
Assigned To No-one
Player Type Iriver H100 series
Severity Medium
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Private No

Details

Currently, Rockbox's optical out functions purely as a true line out -- that is, it bypasses all digital signal processing under Sound Settings, such as volume, treble, bass, EQ, etc.

While a true optical line out is *usually* best, *certain* circumstances require the DSP option (such as listening to a harsh recording with a bright DAC and overly bright headphones).

Would it be possible to create a DSP enable/disable option under General Settings/Playback/Optical Output?

Also: For those who are not adept at EQ, decremental settings for treble and bass (0 to -24 for bass, 0 to -6 for treble) might create a nice alternative.

Thanks for listening.
This task depends upon

Comment by Linus Nielsen Feltzing (linusnielsen) - Friday, 06 October 2006, 09:33 GMT+1
The EQ should definitely work on the S/PDIF output. The volume, bass and treble don't work, since they are handled by the CODEC chip, which is bypassed for digital output.

The EQ is handled in software, and it should affect the digital output as well.
Comment by Daniel Baum (phasemaster) - Saturday, 09 December 2006, 19:28 GMT+1
I second the request for an option "enable/disable sound effects via optical out" in the menu.

I would disable it, because I use the bass, treble, and EQ settings for listening with earphone and I use optical out to connect to my home sound system, where I have an external EQ adjusted to my room etc.
Comment by Thom Johansen (preglow) - Sunday, 10 December 2006, 17:58 GMT+1
You can't apply effects only to the headphones output and not to S/PDIF. It's either off on all outputs, or on. Do you often listen to headphones at the same time as you use the S/PDIF output anyway? Sounds to me like a couple of simple config files that turn off/on effects would suit your purposes nicely.
Also, for the original poster: The treble/bass controls are hardware, we can't control the range in which they operate, thus there are only positive gains, none negative.
Comment by Daniel Baum (phasemaster) - Saturday, 16 December 2006, 16:46 GMT+1
Nono, I don't listen to headphones at the same time as using the S/PDIF output. If the effects can't be applied individually to headphones and S/PDIF, all I am asking for is a quick way to enable/disable them (and some graphical indication of that).

Hmm, the more I think of it, the more I feel the problem is of more fundamental nature. The thing is that it is not obvious to a user that there are two effects sections, one of which sits in front of both analog and digital output (and therefore cannot be applied individually), and one of which sits in front of the digital output.
I would therefore like to suggest to add a graphical user interface to the sound/effect routing. I know such a thing from my T.C. Electronics Finalizer, which has one screen that shows a kind of block diagram of the system (picture enclosed). This gives the user an immediate idea about the system structure (what is possible, what not) and simplifies navigation. In the Finalizer, the user can naviate between the boxes (in the picture, Input box is currently selected) and change their setting with another knob.
   DSC_0007s.jpg (162.1 KiB)

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