TomTom Navigator voice prompts and phone calls

[roycruse]

I have recently accuired the TomTom Navagator 2 software and am extremely pleased with it.

I do not currently have any car kit for making handsfree phone calls.

I have installed tha loud voice prompts so that the tomtom voice commands can be heard through the xda's speakers and im happy with this.

However compared to the loud voice prompts by the navigator software the handsfree audio available through the xdas speaker during a phone call is almost inaudiable over the road noise.

I therefore think im going to have to buy or build some handsfree.

My question is primarilly if im to use the car_audio_r and car _audio_l pins to output audio does all audio output through these pins or only phone audio. ie will i also hear the navigator voice prompts through my hands free (this is what i want)

Also Im wondering if it is possible to use the output from these pins to send audio to a car speaker without connecting an external mic and continueing to use the microfone built in to the xda during phone calls as know one has ever complained about not hearing me - i just cant hear them.

Thanks in advance for any help anyone can give - im sure somebody out there has played with this allready.

[Peter Poelman]

My question is primarilly if im to use the car_audio_r and car _audio_l pins to output audio does all audio output through these pins or only phone audio. ie will i also hear the navigator voice prompts through my hands free (this is what i want)
All audio (phone and PDA) is output on these pins.

Also Im wondering if it is possible to use the output from these pins to send audio to a car speaker without connecting an external mic and continueing to use the microfone built in to the xda during phone calls as know one has ever complained about not hearing me - i just cant hear them.
As long as leave the CAR_ON# pin open (i.e. not connect it to ground or 5V), the microphone of the device is used.

[roycruse]

As long as leave the CAR_ON# pin open (i.e. not connect it to ground or 5V), the microphone of the device is used.

Do you mean that internal microphone is used but all audio is still output to the car_audio_r and car _audio_l pins with the car_on# pin left open.

[Peter Poelman]

Do you mean that internal microphone is used but all audio is still output to the car_audio_r and car _audio_l pins with the car_on# pin left open.
correct.

[roycruse]

The soldering iron is warming up allready.

That sounds like exactly what i need - ill modify my tomtom cable to include the 2 new connectors then run an extra cable out of the 3 way connector on the tomtom lead to go to either my car stereo or a speaker amp mounted under the seat or something.

I dont know if my stereo in my car will except car phone input as its in the shop at the moment getting repaired so i cant take it out - but how do these things usually work - does a pin on the stereo side have to go +5 or GND for the car phone audio to replace the music or does it detect audio and automatically cut in over the music... excuse my ignorance car stereos and car kits are not in my realm of expertise.

If there is a pin that has to be made +5 or GND on steroes to know when the audio needs to be output can the xda handle this at all...

[Peter Poelman]

Usually car radios have a mute input to turn off or down the music when the phone needs the speakers. The XDA does not have such an output. You could fabricate something that detects audio and then for a preset time presents the right mute signal to the radio.

Always questions ask you do... Try and fail you must to learn!

[roycruse]

Thanks for all your help. I'll start hacking at all my new kit as soon as possible...