#76373 - 03/07/2002 09:15
Re: Hey, Mark. What about sending commands to DSP?
[Re: caederus]
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carpal tunnel
Registered: 20/12/1999
Posts: 31596
Loc: Seattle, WA
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"Save Target As..."
Heh...
HEY GENIXIA!!!!!!
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#76374 - 03/07/2002 09:41
Re: Hey, Mark. What about sending commands to DSP?
[Re: tfabris]
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Carpal Tunnel
Registered: 08/02/2002
Posts: 3411
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Yeah Baby. Groooovey.
Excuse me a while. I'm going to disappear with a good read.
_________________________
Mk2a 60GB Blue. Serial 030102962
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#76375 - 03/07/2002 09:52
Re: Hey, Mark. What about sending commands to DSP?
[Re: genixia]
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old hand
Registered: 12/01/2000
Posts: 1079
Loc: Dallas, TX
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Hmmm the stuff about a subwoofer output is interesting, even though it would be impossible to do it. Are any of the pins on the dsp unused?
Sean
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#76376 - 03/07/2002 09:54
Re: Hey, Mark. What about sending commands to DSP?
[Re: Terminator]
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carpal tunnel
Registered: 20/12/1999
Posts: 31596
Loc: Seattle, WA
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Yeah, we knew the subwoofer output was THERE on the DSP, just unused.
Would be interesting to see if some minor rewiring plus a kernel hack could convert the Aux plugs to Subwoofer plugs!!!!
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#76377 - 03/07/2002 10:00
Re: Hey, Mark. What about sending commands to DSP?
[Re: tfabris]
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old hand
Registered: 12/01/2000
Posts: 1079
Loc: Dallas, TX
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Nah it would take more than minor rewiring, you would need a preamp for another output, right?
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#76378 - 03/07/2002 10:06
Re: Hey, Mark. What about sending commands to DSP?
[Re: Terminator]
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carpal tunnel
Registered: 20/12/1999
Posts: 31596
Loc: Seattle, WA
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I dunno, would you? And how tough would that be?
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#76379 - 03/07/2002 12:36
Re: Hey, Mark. What about sending commands to DSP?
[Re: caederus]
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carpal tunnel
Registered: 24/12/2001
Posts: 5528
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Don't suppose you can get the equalier utility off them as well? It will make it much easier since it will be able to calculate the equaliser settings automatically
- Trevor
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#76380 - 04/07/2002 01:50
Re: Hey, Mark. What about sending commands to DSP?
[Re: caederus]
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pooh-bah
Registered: 12/01/2002
Posts: 2009
Loc: Brisbane, Australia
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Nice work. We don't try the simple, obvious things sometimes just because somebody said it wouldn't work.
Anyways, me quits working for money today and goes home to read.
_________________________
Christian #40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)
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#76381 - 04/07/2002 02:21
Re: Hey, Mark. What about sending commands to DSP?
[Re: tfabris]
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journeyman
Registered: 18/02/2000
Posts: 51
Loc: UK
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The subwoofer support in the DSP is all digital. The SAA7705H can mix and
filter the left and right channels in various ways and emit the resulting
stereo bit-stream on pin IIS_OUT2. That pin can be used in at least two
modes: digital audio output or second I2S bus---I think this bus is used
only if there is a slave DSP, which the empeg doesn't (or does it?), so
the pin is probably free. The data sheet recommends tying down unused
pins, so there is a good chance that IIS_OUT2 goes to a resistor.
Even assuming there is an accessible track going to this pin, you would
still need to connect it to an external DAC, so there's no way this
could be done with the existing empeg circuits.
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#76382 - 04/07/2002 03:59
Re: Hey, Mark. What about sending commands to DSP?
[Re: Shonky]
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carpal tunnel
Registered: 21/05/1999
Posts: 5335
Loc: Cambridge UK
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Someone said it wouldn't work because it DIDN'T work previously. We had to sign our souls away to get the documentation three years ago.
Rob
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#76383 - 07/07/2002 07:12
Re: Hey, Mark. What about sending commands to DSP?
[Re: caederus]
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carpal tunnel
Registered: 29/08/2000
Posts: 14491
Loc: Canada
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Well, now. Thank you for this incredibly valuable contribution to the group!
Now.. what to do with it? Here are the VERY OBVIOUS ones:
1.Proper Bass/Treble tone controls for Hijack.
2.Tone Generator controls, possibly useful for tweaking the equalizer response curves.
3. White noise generation using the tone generator (dunno if possible).
cheers
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#76384 - 07/07/2002 07:26
Re: Hey, Mark. What about sending commands to DSP?
[Re: mlord]
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carpal tunnel
Registered: 29/08/2000
Posts: 14491
Loc: Canada
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Also, It might be nice to provide config.ini adjustments to the "source scaling" block on a per-mixer-input basis, for use in getting the Tuner/Aux volume levels to match the MP3 levels (without having to tweak the volume control, either manually or within Hijack).
-ml
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#76385 - 07/07/2002 07:28
Re: Hey, Mark. What about sending commands to DSP?
[Re: mlord]
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carpal tunnel
Registered: 29/08/2000
Posts: 14491
Loc: Canada
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And also, we now have the info needed for adjusting the "bass booster" on a per-input basis.. a Hijack control for that would also be nice.
I can implement the controls, but we need somebody to step forth and provide the core functions for adjusting the various equalizer modes.
??
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#76386 - 07/07/2002 07:45
Re: Hey, Mark. What about sending commands to DSP?
[Re: mlord]
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carpal tunnel
Registered: 29/08/2000
Posts: 14491
Loc: Canada
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One more.. maybe provide control for the noise filtering capabilities for the AUX input (not sure if they apply to that signal, but something is definitely needed on AUX-in .. seems to pick up noise really easy).
-ml
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#76387 - 08/07/2002 04:33
Re: Hey, Mark. What about sending commands to DSP?
[Re: caederus]
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carpal tunnel
Registered: 19/05/1999
Posts: 3457
Loc: Palo Alto, CA
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Aw cool! We never even got a computer readable copy (mind you, I suspect it was classified at the time). I had to take the bindings apart and make photocopies so we'd have a security backup
Hugo
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#76388 - 08/07/2002 05:13
Re: Hey, Mark. What about sending commands to DSP?
[Re: mlord]
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journeyman
Registered: 16/11/2001
Posts: 74
Loc: Utrecht, Netherlands
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Maybe it is a suggestion to start a new topic, since now it gets interesting having the full documentation. Fiddling through this long thread feels a bit uncomfortable.
I've also taken a look... I'm impressed in what Philips has stuffed together in that DSP and making it, at the same time, quite easy to program too.
Lets take the new possibilities to higher level (EQ and also mentioned the unused pin for sub-woofer output->requires also an extra DAC !!).
Cheers,
EiSl
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#76389 - 08/07/2002 05:57
Re: Hey, Mark. What about sending commands to DSP?
[Re: eslange]
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carpal tunnel
Registered: 19/05/1999
Posts: 3457
Loc: Palo Alto, CA
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Yes, the subwoofer/centre channel output (mixed L+R) is ideal for use with the digital out board...
Hugo
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#76390 - 08/07/2002 14:40
Re: Hey, Mark. What about sending commands to DSP?
[Re: altman]
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pooh-bah
Registered: 13/01/2002
Posts: 1649
Loc: Louisiana, USA
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If someone could modify the kernel to provide subwoofer out, we could take a crack at a dedicated sub out board.
Stu
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If you want it to break, buy Sony!
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#76391 - 08/07/2002 15:43
2-Chip tuner solution
[Re: altman]
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member
Registered: 11/01/2002
Posts: 171
Loc: South Bay, CA: USA
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Looking at the datasheet, it is implied that this DSP can turn into a full tuner by adding an RF and IF front end. 2 Philips chips are suggested (TEA6824 & TEA6811), but they are both discontinued. Nontheless, an FM receiver front-end should be cheapo. Integrating in to the DSP might be more complicated.
Are these the chips currently in the tuner add-on?
-Ted
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#76392 - 08/07/2002 16:06
Re: 2-Chip tuner solution
[Re: TedP]
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carpal tunnel
Registered: 19/05/1999
Posts: 3457
Loc: Palo Alto, CA
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No, it doesn't do demod, it's probably a badly written bit of datasheet. The two-chip TEA set are basically (well, later revisions of the same type of chip) what is within the metal cased tuner block in the tuner module.
The DSP only has FM-MPX, AM-AF and signal level inputs. It can't tune broadband signals - it only has ADC capabilities sufficient to get to the 38kHz (pilot is 19kHz, RDS is 38kHz ISTR, L+R is 0-19 and L-R is 19-38) FM encoded signal.
Hugo
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#76393 - 06/08/2002 08:44
Re: Hey, Mark. What about sending commands to DSP?
[Re: caederus]
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carpal tunnel
Registered: 25/06/1999
Posts: 2993
Loc: Wareham, Dorset, UK
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To print this properly, you will need to get hold of the (obsolete) MS Line Draw TTF font, which may not be around on recent versions of Windoze/Word. It has been replaced with New Courier.
_________________________
One of the few remaining Mk1 owners... #00015
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#76394 - 06/08/2002 17:18
Re: Hey, Mark. What about sending commands to DSP?
[Re: schofiel]
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pooh-bah
Registered: 12/01/2002
Posts: 2009
Loc: Brisbane, Australia
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_________________________
Christian #40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)
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#76395 - 06/08/2002 20:46
Re: Hey, Mark. What about sending commands to DSP?
[Re: schofiel]
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Carpal Tunnel
Registered: 08/02/2002
Posts: 3411
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I wish I'd known that *before* my first attempt to print it.
_________________________
Mk2a 60GB Blue. Serial 030102962
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#76396 - 07/08/2002 06:16
Re: Hey, Mark. What about sending commands to DSP?
[Re: mlord]
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stranger
Registered: 14/06/2002
Posts: 36
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I notice that the DSP also provides support for dynamic signal compression (boosting low level signals and attenuating high level signals) which kinda sounds like the Auto volume adjust feature of Hijack. but a little more sophisticated. The DSP seems to have quite a sophisticated 'quasi peak level' detection thingy which might prevent having to manually tweak the current auto volume adjustment for different types of music.
There's also mention of three different modes for the Loudness control - the static mode sounds like the way the empeg works currently, but dynamic bass boost (adjusted according to the amount of bass in the input signal) sounds very cool. I guess this sort of thing detracts from the audiophile purity of the empeg, but most mid-market head units seem to encorporate something like this to add warmth to the sound. Several people have commented that the empeg can sound a bit 'thin' without loudness applied, however the current loudness control reduces the amount of boost applied at higher listening volumes. Perhaps dynamic bass boost would be a better solution?
Good work on this everbody!
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#76397 - 07/08/2002 21:30
Re: Hey, Mark. What about sending commands to DSP?
[Re: retmana]
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Carpal Tunnel
Registered: 08/02/2002
Posts: 3411
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The empeg uses dynamic loudness. It's set up in empeg_mixer.c
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