hello Cedric 1) I'm not sure I understand what you're saying, or rather, I don't understand what you have in mind for which you need such a thing. Anyway, this problem had occurred to me as well. I have TDM16 @48kHz, so BCLK @24. 576MHz. The sample rate I use is 250MHz. So I can output one analog sample " extracted from decoding" for every 5200 or so samples acquired. But one way to "fix it" might be to linearly interpolate the 5200 points between two analog samples.
2) this is a problem for math channels, and so I wonder if any other kind of analog track is offered that can be output from a decoder. best regards Max On Sat, May 6, 2023 at 6:47 PM Cedric de Wijs via sigrok-devel < sigrok-devel@lists.sourceforge.net> wrote: > Hey Max, > > I would inject the decoded values into a math channel. For the following > two reasons this is not possible at the moment: > 1) The samplerate of the decoder is much lower than the sample rate of the > digital signal used as source. I think the math channel has to run at the > frequency of the analog input channels, and I suspect that's also the > samplerate of the digital inputs. The decoder rarely has a new value for > the math channel, so the math channel needs persistent memory that can hold > the last samplevalue from the decoder. I've made this feature request for > that: https://sigrok.org/bugzilla/show_bug.cgi?id=1836 > 2) The Math channels currently only can use analog inputs and the output > of other math channels as inputs. So there needs a way for the equation in > the math channel to choose the output of the decoder. I've made this > feature request for that: > https://sigrok.org/bugzilla/show_bug.cgi?id=1840 > > I don't know about the preferred channel for contributions. > > Cheers, > Cedric > > On 5/6/23 15:21, Massimiliano Cialdi wrote: > > hello, > I would like to contribute some improvements to the tdm_audio decoder. > With the current decoder, it is only possible to set the data sampling > edge with respect to BCLK. In addition, the maximum number of channels per > frame is 8. > I have already started to add the ability to change the FSync polarity as > well, have up to 32 channels per frame, also I am going to add bit_shift > (similar to i2s) and other options. > > I would also like to give an "analog" representation of the decoded data. > That is, I would like to reconstruct the audio waveform of a given channel. > Is it possible to do such a thing? > > For contributions on decoders what is your preferred channel? Can I do > pull requests on git? > > best regards > Max > > -- > Et nunc, auxilium solis, vincam! > Oppugnatio solaris! > VIS! > > Massimiliano Cialdi > > > _______________________________________________ > sigrok-devel mailing > listsigrok-devel@lists.sourceforge.nethttps://lists.sourceforge.net/lists/listinfo/sigrok-devel > > > > _________________________________________________________________ > ________________________________________________________ > Your E-Mail. Your Cloud. Your Office. eclipso Mail & Cloud. > https://www.eclipso.de > > > _______________________________________________ > sigrok-devel mailing list > sigrok-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sigrok-devel > -- Et nunc, auxilium solis, vincam! Oppugnatio solaris! VIS! Massimiliano Cialdi
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