HU Quality AM/FM RDS/RBDS Radio with Features

**gyro** · 03-24-2005, 05:15 AM

Racemier, no chance of implementing TMC? I think all Europeans will benefit and like it ...

**racemier** · 03-24-2005, 11:33 AM

Originally Posted by gyro

Racemier, no chance of implementing TMC? I think all Europeans will benefit and like it ...

I have already been thinking about that a long time and now with the second design I would be quite possible to do that. Just need to find some time for it.
My priority now lays with the sw. Next week I should receive the 2 new PCB's based on the TEF's and then it's soldering time

PM for dutch if you like.

**Maximus** · 03-24-2005, 12:16 PM

Maybe this is rather obvious but I thought I'd ask anyway...

Most (all ?) RDS car stereo tuners today have auto tuning capability where they switch to the transmission with the strongest/best reception.
This is sold as an "RDS feature" but is it really a feature of the reciever/rds-decoder or do you have to have two recievers and write the auto-tune software yourself ?

/M

**Seth** · 03-24-2005, 01:35 PM

This function is called AF (Alternative Frequency) and indeed has to do with FM processing during RDS updating. I know the TEF6890H support that but I'm not sure if the TDA series do. Racemier?

From TEF6890H datasheet :

"Full support of tuner AF update functions with TEA684x tuner ICs, FM audio processing holds the detectors for the FM weak signal processing in their present state during RDS updating."

So you don't need two tuners, it can be done with a bit of code but it is not a priority right now. Since the PIC is flashable, a firmware update will fix that

.

**racemier** · 03-25-2005, 12:18 AM

Originally Posted by Seth

This function is called AF (Alternative Frequency) and indeed has to do with FM processing during RDS updating. I know the TEF6890H support that but I'm not sure if the TDA series do. Racemier?

From TEF6890H datasheet :

"Full support of tuner AF update functions with TEA684x tuner ICs, FM audio processing holds the detectors for the FM weak signal processing in their present state during RDS updating."

So you don't need two tuners, it can be done with a bit of code but it is not a priority right now. Since the PIC is flashable, a firmware update will fix that

.

The AF is actually done in the tuner, you mute the tuner signal while you give it it's new frequency then you measure it's level, if higher stay if lower go back to original frequency and unmute again.

**gyro** · 03-25-2005, 04:02 AM

Originally Posted by racemier

I have already been thinking about that a long time and now with the second design I would be quite possible to do that. Just need to find some time for it.
My priority now lays with the sw. Next week I should receive the 2 new PCB's based on the TEF's and then it's soldering time

PM for dutch if you like.

send a PM

**racemier** · 03-25-2005, 11:38 PM

There seem to be some confusion about the features of Design A & B.

Inputs:
Navigation mono + activation (PC doesn't need to run if amplifier is used)
Phone mono + activation (PC doesn't need to run if amplifier is used)
Aux stereo (CD, Ipod,...)
Antenna car connection

Output:
Front stereo (connect to PC or amplifier)
Rear stereo (connect to PC or amplifier)
Amplifier/antenna remote output
LCD connection (option)
I2C

USB 2.0 controlled
Power from the car

AM
FM (Europe, USA, Japan)
Weather band
RDS/RBDS

Small update:

I received my new PCB's with the TEF design yesterday, so let the soldering begin. No pics yet.

**gyro** · 03-26-2005, 01:23 AM

Thanks Racemier, now everything is much clearer. And the radio gets muted if there is a sinal on phone or GPS I suppose...

**Maximus** · 03-26-2005, 02:40 AM

Originally Posted by racemier

I have already been thinking about that a long time and now with the second design I would be quite possible to do that. Just need to find some time for it.

But wouldn't TMC require you to have two tuners since not all stations transmit TMC data ? That's why I asked a long time ago if the drivers/software would support using more than one unit.

/M

**racemier** · 03-26-2005, 03:04 AM

Originally Posted by Maximus

But wouldn't TMC require you to have two tuners since not all stations transmit TMC data ? That's why I asked a long time ago if the drivers/software would support using more than one unit.

/M

As far as I know TMC is send with RDS together. You need to decode it and have a memory to store the messages and the tuner needs to stay on to be able to keep receiving and saving the TMC messages.

Correct me if I'm wrong.

Regards,