Cellphone mute question

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

JL Grasso - 26 Feb 2004 22:53 GMT

What is a head unit typically looking for on the ATT input, in terms of
signal, in order to switch states for attenuation?

Thanks,

Jerry

Reply to this Message

thelizman - 27 Feb 2004 04:46 GMT

> What is a head unit typically looking for on the ATT input, in terms of
> signal, in order to switch states for attenuation?

Typically it looks for a ground input (-12v). Old units will take any
fluctuation in voltage (which can be a pain in the butt).

Don't use it. You'll regret it.

Signature

thelizman "I didn't steal the FAQ either"
hammerattack@teamrocs.com
teamROCS Car Audio Forums http://www.teamrocs.com/caraudio/
teamROCS Car Audio News http://www.teamrocs.com/news/
"It's about the music, stupid"

This post is Copyright (C) 2004. Reproduction of its content anywhere
other than usenet without the express written permission of the author
is forbidden.

Reply to this Message

JL Grasso - 27 Feb 2004 11:48 GMT

>> What is a head unit typically looking for on the ATT input, in terms of
>> signal, in order to switch states for attenuation?
>
>Typically it looks for a ground input (-12v). Old units will take any
>fluctuation in voltage (which can be a pain in the butt).

Thanks. I assume that you mean open is normal state, gnd is attenuated? Is
this true for all newer head units? This particular head unit is a Sony
CDX-MP80.

I should also state that this was brought up when looking for a solution
for an aftermarket GPS/navigation unit to allow you to better hear the
voice prompts for navigation.

>Don't use it. You'll regret it.

Is it typically not reliable? If so, is the reliability usually an issue
with the head unit, the cell phone, or perhaps it's typically a third
party/interface problem?

Jerry

Reply to this Message

thelizman - 27 Feb 2004 21:47 GMT

> Thanks. I assume that you mean open is normal state, gnd is attenuated? Is
> this true for all newer head units? This particular head unit is a Sony
> CDX-MP80.

Consult the manufacturers literature. I know pioneer gives you the
choice of attenuation or full mute on their cell phone mute wires.
However, the PITA I spoke of is that typically you have to manually
un-mute/unatt it.

Signature

Reply to this Message

JL Grasso - 28 Feb 2004 05:20 GMT

>> Thanks. I assume that you mean open is normal state, gnd is attenuated? Is
>> this true for all newer head units? This particular head unit is a Sony
[quoted text clipped - 4 lines]
>However, the PITA I spoke of is that typically you have to manually
>un-mute/unatt it.

Thanks, Lizard.

Jerry

Reply to this Message