HOWTO: AUX-in for your V50, basic sound system.
181 - 200 of 834 Posts
Re: (Fellow)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Fellow</b> »</i></TD></TR><TR><TD CLASS="quote">Where in germany is cologne? North? I live in sweden so I might be able to lend you my amp if that's all you need.</TD></TR></TABLE><br>cologne is in the west of germany... <p>I think a complete car would be better than just the amp... don't know if I can just swap out the high performance with my basic audio module... <p>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Fellow</b> »</i></TD></TR><TR><TD CLASS="quote">Where in germany is cologne? North? I live in sweden so I might be able to lend you my amp if that's all you need.</TD></TR></TABLE><br>cologne is in the west of germany... <p>I think a complete car would be better than just the amp... don't know if I can just swap out the high performance with my basic audio module... <p>
Re: HOWTO: AUX-in for your V50, basic sound system. (heico2.4i)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>heico2.4i</b> »</i></TD></TR><TR><TD CLASS="quote">what do u need help with? adding subs? lol</TD></TR></TABLE><p>Yes ! <p>I have to run a wire to the battery for power, But what about for the remote wire and am i able to connect to the speakers anywhere in the rear? also are there any easy places to gound ?
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>heico2.4i</b> »</i></TD></TR><TR><TD CLASS="quote">what do u need help with? adding subs? lol</TD></TR></TABLE><p>Yes ! <p>I have to run a wire to the battery for power, But what about for the remote wire and am i able to connect to the speakers anywhere in the rear? also are there any easy places to gound ?
Joined
·
2,752 Posts
Re: HOWTO: AUX-in for your V50, basic sound system. (jdsr917)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>jdsr917</b> »</i></TD></TR><TR><TD CLASS="quote"><p>Yes ! <p>I have to run a wire to the battery for power, But what about for the remote wire and am i able to connect to the speakers anywhere in the rear? also are there any easy places to gound ? </TD></TR></TABLE><p>the whole body can be used for ground.<p>SO I tried this finally...took the trunk apart, got the amp out, opened it up, got the wire, split it, and before soldering it did a test run to C626 and C625 and....<br>Nothing. I was so dissapointed, I was there for at least 10 minutes with my friend with the music loud at 11pm (neighbors started getting annoyed lol) trying to hear ANY interference in the radio...and nothing. Dissapointed, I dropped my hands in despair, sliding it down the amp slowly. While doing that motion, I heard some strong interference and for a second my ipods music started to play. <br>Intrigued, I started testing where I would get any sound, taking care not to short the circuit. For my 2004.5 standard S40, standard sound system, I got a signal (most decent were toward the edge of the subwoofer)<br>c826 c619 c616 c621 c617 r626 r625 r630 r620 r621 r612 r611 r805 r629 r627 r628 <br>These were all heard through diff speakers and diff qualities.<p> I really want to put in a relay but im not that great at electronics ( i had my friend solder the aux wire to the resistor)...So Im thinking whether its worth it to solder it w/o or with...decisions decisions...<br>if someone *cough* crossie* cough finnspeed* cough* would be willing to create a relay for me, i could test it out here...<br>so yeah. just wanted to let everyone know where i stand...<br>again crossie thanks for your contribution to this...you started this "revolution" lol<p><i>Modified by chromecarz00 at 7:45 PM 9-22-2009</i><BR><BR>
<i>Modified by chromecarz00 at 7:46 PM 9-22-2009</i>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>jdsr917</b> »</i></TD></TR><TR><TD CLASS="quote"><p>Yes ! <p>I have to run a wire to the battery for power, But what about for the remote wire and am i able to connect to the speakers anywhere in the rear? also are there any easy places to gound ? </TD></TR></TABLE><p>the whole body can be used for ground.<p>SO I tried this finally...took the trunk apart, got the amp out, opened it up, got the wire, split it, and before soldering it did a test run to C626 and C625 and....<br>Nothing. I was so dissapointed, I was there for at least 10 minutes with my friend with the music loud at 11pm (neighbors started getting annoyed lol) trying to hear ANY interference in the radio...and nothing. Dissapointed, I dropped my hands in despair, sliding it down the amp slowly. While doing that motion, I heard some strong interference and for a second my ipods music started to play. <br>Intrigued, I started testing where I would get any sound, taking care not to short the circuit. For my 2004.5 standard S40, standard sound system, I got a signal (most decent were toward the edge of the subwoofer)<br>c826 c619 c616 c621 c617 r626 r625 r630 r620 r621 r612 r611 r805 r629 r627 r628 <br>These were all heard through diff speakers and diff qualities.<p> I really want to put in a relay but im not that great at electronics ( i had my friend solder the aux wire to the resistor)...So Im thinking whether its worth it to solder it w/o or with...decisions decisions...<br>if someone *cough* crossie* cough finnspeed* cough* would be willing to create a relay for me, i could test it out here...<br>so yeah. just wanted to let everyone know where i stand...<br>again crossie thanks for your contribution to this...you started this "revolution" lol<p><i>Modified by chromecarz00 at 7:45 PM 9-22-2009</i><BR><BR>
<i>Modified by chromecarz00 at 7:46 PM 9-22-2009</i>
Re: HOWTO: AUX-in for your V50, basic sound system. (chromecarz00)
I have hacked an input to a premium sound amp in an 2004 XC90. <p>In my case there is no RSE units / headphones. The unit contains a dolby / DTS chip though this is not enabled.<p>The amp has 2 DAC chips (each supports 5 channels) - one is used for the for rear seat units (looks like line level ouputs) and one for main amp.<p>The DAC for the main amp has 5 channels FR, FL, RR, RL and ??. Each goes to the power stage via a volume control chip (controlled by the main unit volume control).<p>This requires:<p>- 4 channels need to be isolated (2 relays)<br>- input L & R channels need to be connected to two power stages.<p>I have this working but need to tweak further as have some crosstalk from disconnected integrated source and impedence matching.<p>The four tracks to cut are easily located and isolated - I'll post some pics soon.<p>Paul
I have hacked an input to a premium sound amp in an 2004 XC90. <p>In my case there is no RSE units / headphones. The unit contains a dolby / DTS chip though this is not enabled.<p>The amp has 2 DAC chips (each supports 5 channels) - one is used for the for rear seat units (looks like line level ouputs) and one for main amp.<p>The DAC for the main amp has 5 channels FR, FL, RR, RL and ??. Each goes to the power stage via a volume control chip (controlled by the main unit volume control).<p>This requires:<p>- 4 channels need to be isolated (2 relays)<br>- input L & R channels need to be connected to two power stages.<p>I have this working but need to tweak further as have some crosstalk from disconnected integrated source and impedence matching.<p>The four tracks to cut are easily located and isolated - I'll post some pics soon.<p>Paul
Re: HOWTO: AUX-in for your V50, basic sound system. (pauljloz)
Was anyone ever able to get an AUX setup working for the basic audio (single CD player with integrated amp/cd)? <p> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0">
Was anyone ever able to get an AUX setup working for the basic audio (single CD player with integrated amp/cd)? <p> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0">
Joined
·
2,166 Posts
Re: (crossie)
I think he meant without the amp in the trunk. Some of them have a class D amp mounted in the little display up front I think? I'm also curious, I went looking for my amp but couldn't find it (S40 basic 2005)
I think he meant without the amp in the trunk. Some of them have a class D amp mounted in the little display up front I think? I'm also curious, I went looking for my amp but couldn't find it (S40 basic 2005)
Re: (dlk1)
Also, and I asked this before, but don't know if those who might know saw it, so I'll ask again...<p>I've got an early run '07 V50 with basic audio and single CD player and even though the manuals are written as if the players can play MP3 files, they can't.<p>I know Volvo now has a single CD player that can play MP3 files. Does anyone know if that could be swapped with the regular single audio only CD player? <p>Dealers and Volvo of course are useless for these questions...<p>So where is the MP3 decoding done? In the player or the display module unit?<p>If the AUX in is not possible with the integrated amp, it would be nice to know if this swap would work and you could get 200 or so songs on a CD.
Also, and I asked this before, but don't know if those who might know saw it, so I'll ask again...<p>I've got an early run '07 V50 with basic audio and single CD player and even though the manuals are written as if the players can play MP3 files, they can't.<p>I know Volvo now has a single CD player that can play MP3 files. Does anyone know if that could be swapped with the regular single audio only CD player? <p>Dealers and Volvo of course are useless for these questions...<p>So where is the MP3 decoding done? In the player or the display module unit?<p>If the AUX in is not possible with the integrated amp, it would be nice to know if this swap would work and you could get 200 or so songs on a CD.
Joined
·
2,166 Posts
Re: (dlk1)
Decoding is done in the player (where the CDs go), everything just sends display info to the display. <p>Are you sure the amp is in the CD player and not the display? When I popped mine out the last time there was a odd shaped heat sink on the back. Not sure I remember seeing this on the last car (with premium) though I may not have been looking. I wrote down the IC's in the display and put everything back together and haven't touched it since. They are:<br>64f7055f40. CPU<br>2902 41958 jrc. Ic 6<br>Tja1040 / tja1020. Output<br>4271-26 ar422 amp<br>48m033f. Reg<br>Ti ht245 47k. Ic8 &7<br>Lv32a ic10<br>25c64si ic5<p>Really haven't put much time into it other than that since I convinced myself it was easier to get a 2010 with premium and ipod now that they have AWD/MT again.
Decoding is done in the player (where the CDs go), everything just sends display info to the display. <p>Are you sure the amp is in the CD player and not the display? When I popped mine out the last time there was a odd shaped heat sink on the back. Not sure I remember seeing this on the last car (with premium) though I may not have been looking. I wrote down the IC's in the display and put everything back together and haven't touched it since. They are:<br>64f7055f40. CPU<br>2902 41958 jrc. Ic 6<br>Tja1040 / tja1020. Output<br>4271-26 ar422 amp<br>48m033f. Reg<br>Ti ht245 47k. Ic8 &7<br>Lv32a ic10<br>25c64si ic5<p>Really haven't put much time into it other than that since I convinced myself it was easier to get a 2010 with premium and ipod now that they have AWD/MT again.
Joined
·
3,760 Posts
Re: (theshadow27)
Bump. Break is coming, thinking about picking this up again. Shadow, you able to possibly lend a hand? Ive got schematics, and a boat load of info on everything, just need a hand making sense of it all...<br>Again, for those of you just tuning in this is RE: Integrated Amp, single CD.
Bump. Break is coming, thinking about picking this up again. Shadow, you able to possibly lend a hand? Ive got schematics, and a boat load of info on everything, just need a hand making sense of it all...<br>Again, for those of you just tuning in this is RE: Integrated Amp, single CD.
Joined
·
2,166 Posts
Re: (sanatarium)
Of course. Schematics for the car right (EWDs)? The circuit board schematics would be clutch.
Of course. Schematics for the car right (EWDs)? The circuit board schematics would be clutch.
Re: (sanatarium)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>sanatarium</b> »</i></TD></TR><TR><TD CLASS="quote">Bump. Break is coming, thinking about picking this up again. Shadow, you able to possibly lend a hand? Ive got schematics, and a boat load of info on everything, just need a hand making sense of it all...<br>Again, for those of you just tuning in this is RE: Integrated Amp, single CD.</TD></TR></TABLE><p>I'm on the edge of my seat. Good luck. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>sanatarium</b> »</i></TD></TR><TR><TD CLASS="quote">Bump. Break is coming, thinking about picking this up again. Shadow, you able to possibly lend a hand? Ive got schematics, and a boat load of info on everything, just need a hand making sense of it all...<br>Again, for those of you just tuning in this is RE: Integrated Amp, single CD.</TD></TR></TABLE><p>I'm on the edge of my seat. Good luck. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
Joined
·
2,166 Posts
Re: (theshadow27)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>theshadow27</b> »</i></TD></TR><TR><TD CLASS="quote">Decoding is done in the player (where the CDs go), everything just sends display info to the display. <p>Are you sure the amp is in the CD player and not the display? When I popped mine out the last time there was a odd shaped heat sink on the back. Not sure I remember seeing this on the last car (with premium) though I may not have been looking. I wrote down the IC's in the display and put everything back together and haven't touched it since. They are:<br>64f7055f40. CPU<br>2902 41958 jrc. Ic 6<br>Tja1040 / tja1020. Output<br>4271-26 ar422 amp<br>48m033f. Reg<br>Ti ht245 47k. Ic8 &7<br>Lv32a ic10<br>25c64si ic5<br> </TD></TR></TABLE><p>Datasheets (this post will be updated as it comes in):<br><A HREF="http://america.renesas.com/fmwk.jsp?cnt=sh7055_root.jsp&fp=/products/mpumcu/superh_family/sh7050_series/sh7055_group/" TARGET="_blank">Renesas HD64F7055S </A><br>CAN (network) transceiver: <A HREF="http://www.nxp.com/pip/TJA1040_6.html" TARGET="_blank">NXP TJA1040</A><br>LIN (network) transceiver: <A HREF="http://www.nxp.com/pip/TJA1020_5.html" TARGET="_blank">NXP TJA1020</A><br>IC7&8 3 state octal bus transceiver: <A HREF="http://www.csd.uoc.gr/~hy220/2005/datasheets/sn74hct245.pdf" TARGET="_blank">Texas Instruments SN74HCT245</A><br>IC10: Quad OR gate<A HREF="http://focus.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=SN74LV32A" TARGET="_blank">TI SN54LV32A</A> - WTF is this doing in there?<br>VREG: Low voltage dropout regulator <A HREF="http://www.alldatasheet.com/datasheet-pdf/pdf/215097/TOSHIBA/TA48M033F.html" TARGET="_blank">Toshiba TA48M033F</A><br>IC5: 64kb EEPROM <A HREF="http://www.datasheetcatalog.org/datasheet/fairchild/FM25C640U.pdf" TARGET="_blank">Fairchild FM25C640U</A><p>Can't find IC6 or what I called the amp. Looking less and less like an amp considering the other chips, none of which do audio processing. Perhaps it is in the CD player like the newer systems. Or maybe I wasn't looking hard enough for the amp in the back. Ugg... <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0">
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>theshadow27</b> »</i></TD></TR><TR><TD CLASS="quote">Decoding is done in the player (where the CDs go), everything just sends display info to the display. <p>Are you sure the amp is in the CD player and not the display? When I popped mine out the last time there was a odd shaped heat sink on the back. Not sure I remember seeing this on the last car (with premium) though I may not have been looking. I wrote down the IC's in the display and put everything back together and haven't touched it since. They are:<br>64f7055f40. CPU<br>2902 41958 jrc. Ic 6<br>Tja1040 / tja1020. Output<br>4271-26 ar422 amp<br>48m033f. Reg<br>Ti ht245 47k. Ic8 &7<br>Lv32a ic10<br>25c64si ic5<br> </TD></TR></TABLE><p>Datasheets (this post will be updated as it comes in):<br><A HREF="http://america.renesas.com/fmwk.jsp?cnt=sh7055_root.jsp&fp=/products/mpumcu/superh_family/sh7050_series/sh7055_group/" TARGET="_blank">Renesas HD64F7055S </A><br>CAN (network) transceiver: <A HREF="http://www.nxp.com/pip/TJA1040_6.html" TARGET="_blank">NXP TJA1040</A><br>LIN (network) transceiver: <A HREF="http://www.nxp.com/pip/TJA1020_5.html" TARGET="_blank">NXP TJA1020</A><br>IC7&8 3 state octal bus transceiver: <A HREF="http://www.csd.uoc.gr/~hy220/2005/datasheets/sn74hct245.pdf" TARGET="_blank">Texas Instruments SN74HCT245</A><br>IC10: Quad OR gate<A HREF="http://focus.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=SN74LV32A" TARGET="_blank">TI SN54LV32A</A> - WTF is this doing in there?<br>VREG: Low voltage dropout regulator <A HREF="http://www.alldatasheet.com/datasheet-pdf/pdf/215097/TOSHIBA/TA48M033F.html" TARGET="_blank">Toshiba TA48M033F</A><br>IC5: 64kb EEPROM <A HREF="http://www.datasheetcatalog.org/datasheet/fairchild/FM25C640U.pdf" TARGET="_blank">Fairchild FM25C640U</A><p>Can't find IC6 or what I called the amp. Looking less and less like an amp considering the other chips, none of which do audio processing. Perhaps it is in the CD player like the newer systems. Or maybe I wasn't looking hard enough for the amp in the back. Ugg... <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0">
Joined
·
2,166 Posts
Re: (sanatarium)
<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>sanatarium</b> »</i></TD></TR><TR><TD CLASS="quote">Progress, sort of. <p>The speakers are connected to the console, which is connected by wires and optical cables the the CD player object<p>Interesting side note, I found where those pesky antenna leads go, into the back of the CD player. This leads me to believe that the CD player object is actually a CD player/amplifier all in one, that must take radio signals and CDs and turn them into analog signals, which then get sent through the interface to the console display thingy, where the signals are then sent out to the speakers. This means little for us I'm afraid. This assumption is confirmed by the presence of heatsinks on two sides of the CD player object, it also has some rather thick wires which feed power into it, further confirming this. The CD player object does not appear to be openable due to the way it was constructed, but I am fiddling with it now to see what I can come up with.<p>Its the third one down here.<br></TD></TR></TABLE><p>After ripping the dash apart I've determined that my '05 has this exact same setup. Radio antenna wires go to the back of the CD player (single), as do a speaker wire connector and a MOST ring connector. I'm pretty sure it's the same connector that Volvo uses for everything (the rest of the HU* series, that is) although maybe someone can double check (that's rhetorical, I'll post in the audio forum). <p>Took apart the CD player/amp/AFM and took pics that look just like Jason's:<br><IMG SRC="http://theeshadow.com/files/volvo/radio1.jpg" BORDER="0"><br><IMG SRC="http://theeshadow.com/files/volvo/radio3.jpg" BORDER="0"><br><IMG SRC="http://theeshadow.com/files/volvo/radio2.jpg" BORDER="0"><br><IMG SRC="http://theeshadow.com/files/volvo/radio4.jpg" BORDER="0"><p>Which is really interesting that my 05 has the 07+ system. Anyway, here's the skinny. The whole shebang is controlled by a Phillips (bought by NXP) <A HREF="http://www.nxp.com/pip/SAA7706H_1.html" TARGET="_blank">SAA7706H</A> "Car radio digital signal processor." This is a very impressive chip. It:<br>1) Talks over MOST<br>2) Digitally demodulates FM and tunes AM and FM internally<br>3) Has SPDIF inputs for the CD player<br>4) Has a 5 channel EQ (probably unused) and digital volume control<br>5) Outputs Dolby rear channels (phase matrixed)<br>6) Has no less than 6 stereo inputs muxed internally and two mono inputs (phone or something)<p>The CAN interaction which handles radio station selection, cd track info, and button inputs is done by an ill-documented NEC D70F3261YGC which is a standard 32 bit MCU with a CAN stack. Not much we can do there. It controls the SAA7706H using an I2C bus. <p>The audio is handled by a <A HREF="http://www.st.com/stonline/books/pdf/docs/8687.pdf" TARGET="_blank">ST TDA7563</A> quad channel (4x28w) class D integrated amp. It's also controlled over I2C communication with the NEC MCU (for things like mute, as well as relaying temp and performance data). <p>So to tap into this sucker we have a couple options:<p>1) The easiest and most obvious is to tap directly into the amp. This has the highest probability of success. One problem with it is that there are four channels, and an iPod or whatever will only have two, so you'd have to bridge them somehow. <br>2) A cleaner but more difficult way is to sniff the I2C bus and figure out what's going on. Using a 10 cent PIC you could proxy the communication between the NEC and the DSP, and have a button that would send it into another input mode. The car would still think it was playing the radio or whatever, but the DSP would be playing your input. Volume controls would still work from the wheel. <br>3) The cleanest and most difficult way would involve a SBPC (single board PC) with an SD/CF card loaded with music, running some incarnation of linux. That then gets placed in the I2C bus pathway between the NEC and DSP, and serves two purposes. One, it can send the NEC text to display on the screen (transmitted over CAN eventually - remember the radio can display text). Two, it can intercept the station tuning requests from the NEC and translate them into track change requests. It would also be able to spit out SPDIF directly, which would be nice. <p>What sucks is there's no middle ground - There are no stock stereo inputs active to tap into (the CD player is SPDIF and the AM/FM is on-die). Any thoughts Jason?
<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>sanatarium</b> »</i></TD></TR><TR><TD CLASS="quote">Progress, sort of. <p>The speakers are connected to the console, which is connected by wires and optical cables the the CD player object<p>Interesting side note, I found where those pesky antenna leads go, into the back of the CD player. This leads me to believe that the CD player object is actually a CD player/amplifier all in one, that must take radio signals and CDs and turn them into analog signals, which then get sent through the interface to the console display thingy, where the signals are then sent out to the speakers. This means little for us I'm afraid. This assumption is confirmed by the presence of heatsinks on two sides of the CD player object, it also has some rather thick wires which feed power into it, further confirming this. The CD player object does not appear to be openable due to the way it was constructed, but I am fiddling with it now to see what I can come up with.<p>Its the third one down here.<br></TD></TR></TABLE><p>After ripping the dash apart I've determined that my '05 has this exact same setup. Radio antenna wires go to the back of the CD player (single), as do a speaker wire connector and a MOST ring connector. I'm pretty sure it's the same connector that Volvo uses for everything (the rest of the HU* series, that is) although maybe someone can double check (that's rhetorical, I'll post in the audio forum). <p>Took apart the CD player/amp/AFM and took pics that look just like Jason's:<br><IMG SRC="http://theeshadow.com/files/volvo/radio1.jpg" BORDER="0"><br><IMG SRC="http://theeshadow.com/files/volvo/radio3.jpg" BORDER="0"><br><IMG SRC="http://theeshadow.com/files/volvo/radio2.jpg" BORDER="0"><br><IMG SRC="http://theeshadow.com/files/volvo/radio4.jpg" BORDER="0"><p>Which is really interesting that my 05 has the 07+ system. Anyway, here's the skinny. The whole shebang is controlled by a Phillips (bought by NXP) <A HREF="http://www.nxp.com/pip/SAA7706H_1.html" TARGET="_blank">SAA7706H</A> "Car radio digital signal processor." This is a very impressive chip. It:<br>1) Talks over MOST<br>2) Digitally demodulates FM and tunes AM and FM internally<br>3) Has SPDIF inputs for the CD player<br>4) Has a 5 channel EQ (probably unused) and digital volume control<br>5) Outputs Dolby rear channels (phase matrixed)<br>6) Has no less than 6 stereo inputs muxed internally and two mono inputs (phone or something)<p>The CAN interaction which handles radio station selection, cd track info, and button inputs is done by an ill-documented NEC D70F3261YGC which is a standard 32 bit MCU with a CAN stack. Not much we can do there. It controls the SAA7706H using an I2C bus. <p>The audio is handled by a <A HREF="http://www.st.com/stonline/books/pdf/docs/8687.pdf" TARGET="_blank">ST TDA7563</A> quad channel (4x28w) class D integrated amp. It's also controlled over I2C communication with the NEC MCU (for things like mute, as well as relaying temp and performance data). <p>So to tap into this sucker we have a couple options:<p>1) The easiest and most obvious is to tap directly into the amp. This has the highest probability of success. One problem with it is that there are four channels, and an iPod or whatever will only have two, so you'd have to bridge them somehow. <br>2) A cleaner but more difficult way is to sniff the I2C bus and figure out what's going on. Using a 10 cent PIC you could proxy the communication between the NEC and the DSP, and have a button that would send it into another input mode. The car would still think it was playing the radio or whatever, but the DSP would be playing your input. Volume controls would still work from the wheel. <br>3) The cleanest and most difficult way would involve a SBPC (single board PC) with an SD/CF card loaded with music, running some incarnation of linux. That then gets placed in the I2C bus pathway between the NEC and DSP, and serves two purposes. One, it can send the NEC text to display on the screen (transmitted over CAN eventually - remember the radio can display text). Two, it can intercept the station tuning requests from the NEC and translate them into track change requests. It would also be able to spit out SPDIF directly, which would be nice. <p>What sucks is there's no middle ground - There are no stock stereo inputs active to tap into (the CD player is SPDIF and the AM/FM is on-die). Any thoughts Jason?
Joined
·
2,166 Posts
Re: (theshadow27)
And, to continue my boring ass rant, here's how I figure the PCB is laid out:<p> <IMG SRC="http://theeshadow.com/files/volvo/radio_pcb_breakdown.png" BORDER="0"> <p>And here's how it works, to the best I can tell by looking at it and the part numbers:<p> <IMG SRC="http://theeshadow.com/files/volvo/radio_block_diag.png" BORDER="0">
And, to continue my boring ass rant, here's how I figure the PCB is laid out:<p> <IMG SRC="http://theeshadow.com/files/volvo/radio_pcb_breakdown.png" BORDER="0"> <p>And here's how it works, to the best I can tell by looking at it and the part numbers:<p> <IMG SRC="http://theeshadow.com/files/volvo/radio_block_diag.png" BORDER="0">
Joined
·
3,760 Posts
Re: (theshadow27)
Son of a mother. Thats the one man. Now to make it work. <p>The options I have explored so far:<p>-Use a Spdif circuit to encode the stereo signal and inject it in the CD input. <p>-Use a simple muxer circuit to encode the stereo signal into an FM stream and feed that in (there are ICs capable of encoding RDS data as well, which would be neat with an ipod, it would display metadata on screen) <-- My personal favorite, though I would be concerned about sound quality with the muxification circuit. <p>-The method I have tried and failed at: injecting the stereo signal into the DSP at any point, and for good reason, there are no stereo signals to be had that enter the DSP. Oh well.. <p><b>-The method I am planning to explore over break: Tapping into the amp, this was my next route. What are we getting into with bridging two channels? Is it acceptable to just tie them together or is some sort of isolation/leveling necessary?</b><p>And yes, that chip is pretty interesting, had a conversation with my friends dad, an intel employee, works with on die microscopic high tech cool stuff, he was also pretty impressed they had all that stuff handled by one chip, but we agreed it was likely an economic solution, more expensive chip, less circuitry on the board(other systems would have ICs to do each of those functions individually and the associated circuitry.
Son of a mother. Thats the one man. Now to make it work. <p>The options I have explored so far:<p>-Use a Spdif circuit to encode the stereo signal and inject it in the CD input. <p>-Use a simple muxer circuit to encode the stereo signal into an FM stream and feed that in (there are ICs capable of encoding RDS data as well, which would be neat with an ipod, it would display metadata on screen) <-- My personal favorite, though I would be concerned about sound quality with the muxification circuit. <p>-The method I have tried and failed at: injecting the stereo signal into the DSP at any point, and for good reason, there are no stereo signals to be had that enter the DSP. Oh well.. <p><b>-The method I am planning to explore over break: Tapping into the amp, this was my next route. What are we getting into with bridging two channels? Is it acceptable to just tie them together or is some sort of isolation/leveling necessary?</b><p>And yes, that chip is pretty interesting, had a conversation with my friends dad, an intel employee, works with on die microscopic high tech cool stuff, he was also pretty impressed they had all that stuff handled by one chip, but we agreed it was likely an economic solution, more expensive chip, less circuitry on the board(other systems would have ICs to do each of those functions individually and the associated circuitry.
181 - 200 of 834 Posts
Join the discussion
SwedeSpeed - Volvo Performance Forum
A forum community dedicated to Volvo owners and enthusiasts. Come join the discussion about performance, builds, modifications, classifieds, troubleshooting, maintenance, new releases, and more!
Full Forum Listing
Explore Our Forums
Recommended Communities
Join now to ask and comment!