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[Kevin Wood]

Hmmm, might have a play over Xmas if I get time, seeing as I haven't got a CID yet to play CD70.

My stumbling block will be matching the audio feed in, as thats not an area I excel in (no shit, Sherlock!)

I don't think there'll be a problem there with Max on the case .. It's reverse engineering the signalling interface. Might have to dust off my logic analyser for that...

[Me]

Hmmm, might have a play over Xmas if I get time, seeing as I haven't got a CID yet to play CD70.

My stumbling block will be matching the audio feed in, as thats not an area I excel in (no shit, Sherlock!)

I don't think there'll be a problem there with Max on the case .. It's reverse engineering the signalling interface. Might have to dust off my logic analyser for that...

I'm not crediting the system with that much intelligence to be honest

[MaxV6]

if i was designing a thing like the ncdc/cid combo , i'd have a feed to the control unit  with a simple 5v logic high to signal valid source,   and then all the complex data to the screen on another "pass thru" feed....   to save the need to have a bunch of decoding stuff to receive the data stream and decide it's indicating a valid source....     

a return feed for control input.

and then of course the audio feeds....


i'm currently working on the guessumption that the feed out of the changer is going to be analogue audio, rather than digital, although digital would be a more efficient cost engineering solution....     as the main unit could switch digital inputs to the DA convertors , keeping noise to a minimum, and saving the cost of a second set of DA converters for the SatNav & top CD slot..

i've guessed at this because the cdc mechanism is multi use....     and there are some additional complications to sync'ing up separate digital playback

systems.


it's also borne out by zirk's fun with resistor networks...

[VXL V6]

if i was designing a thing like the ncdc/cid combo , i'd have a feed to the control unit  with a simple 5v logic high to signal valid source,   and then all the complex data to the screen on another "pass thru" feed....   to save the need to have a bunch of decoding stuff to receive the data stream and decide it's indicating a valid source....     

a return feed for control input.

and then of course the audio feeds....


i'm currently working on the guessumption that the feed out of the changer is going to be analogue audio, rather than digital, although digital would be a more efficient cost engineering solution....     as the main unit could switch digital inputs to the DA convertors , keeping noise to a minimum, and saving the cost of a second set of DA converters for the SatNav & top CD slot..

i've guessed at this because the cdc mechanism is multi use....     and there are some additional complications to sync'ing up separate digital playback

systems.


it's also borne out by zirk's fun with resistor networks...

It's pretty much bound to be based on the origins of CDC3's and how the single din NCDR11/1500's interfaced to them IMHO.

[MaxV6]

in which case, i'm anticipating you would measure about 0.45 V peak on a fullscale sine wave signal (0dBFS )

[Kevin Wood]

in which case, i'm anticipating you would measure about 0.45 V peak on a fullscale sine wave signal (0dBFS )

There's a German article about bodging an audio input into that interface somewhere which indicates that it's analogue audio. Wish I could find it as I think it had a pinout of that connector.

The head unit does also add RDS data to the display, of course, so unlikely that the CDC output is fed straight through, but I see what you're saying. There might be other applications where it is. Interface to the MID display is just a three wire serial line, IIRC, so easy enough to hack if it's similar.

[feeutfo]

This one?
http://www.migrosser.de.vu/

Bah, links don't appear to work any more. 

[Me]

Interface to the MID display is just a three wire serial line, IIRC, so easy enough to hack if it's similar.

Or 2 in the case of CCRT and NCDC models

Are we looking at creating a full blown CDC emulator so the HU can control the gayPod (very, very difficult, and would tie it specifically into crApple players), or just simply trying to feed in an audio signal from any MP3 player (suspect far more trivial, as a guess)

[feeutfo]

Uphill kardon input from iPhone 4 3.5 jack has far superior sound quality to the direct iPod control function. But obviously direct control of the iPod function is lost if using the 3.5 mill jack, although the iPhone is dash mounted it is far more distracting to use than the the control knob.

Best thing about it is Tomtom voice mutes the iPod function music, transmitted via Bose. It's great, top quality although voice on one of the tracks is scratchy I guess due to dodgy compression, incoming calls and traffic master mute over that.

Annoyance is selecting the input on harmon karden every time the ignition is turned on, as ignition off re sets to the normal full on iPod control.

[MaxV6]

Interface to the MID display is just a three wire serial line, IIRC, so easy enough to hack if it's similar.

Or 2 in the case of CCRT and NCDC models

Are we looking at creating a full blown CDC emulator so the HU can control the gayPod (very, very difficult, and would tie it specifically into crApple players), or just simply trying to feed in an audio signal from any MP3 player (suspect far more trivial, as a guess)

provide a selectable line input, without having to have a cd playing at the same time  , not provide control....