Zipzit wrote on another subject:

"I know the auto industry uses actual vehicle speed input for radio
volume adjustment (I'm an Automotive Engineer… with close ties to
radio design folks.) "

They do? Can anybody confirm this? I have always wondered how they do
it, it works better than I thought it would. I have just bought a new
Fod which has this feature, and is impressed by how well it works. I
have been wondering how they could set up the microphone and feedback
loop for this. But, alas, they cheat...

Per.

On Thu, 07 Oct 2004 20:10:47 +0200, Per Stromgren
wrote:

Zipzit wrote on another subject:

"I know the auto industry uses actual vehicle speed input for radio
volume adjustment (I'm an Automotive Engineer… with close ties to
radio design folks.) "

They do? Can anybody confirm this? I have always wondered how they do
it, it works better than I thought it would. I have just bought a new
Fod which has this feature, and is impressed by how well it works. I
have been wondering how they could set up the microphone and feedback
loop for this. But, alas, they cheat...

Both. My former Saab had (defeatable) speed-related volume
adjustment. My current Mercedes has both: a (defeatable) speed
adjustable volume adjustment and a (non-defeatable) compensation via a
microphone in the headliner. Awful stuff.

Kal

Kalman Rubinson wrote:

On Thu, 07 Oct 2004 20:10:47 +0200, Per Stromgren
wrote:

Zipzit wrote on another subject:

"I know the auto industry uses actual vehicle speed input for radio
volume adjustment (I'm an Automotive Engineer… with close ties to
radio design folks.) "

They do? Can anybody confirm this? I have always wondered how they do
it, it works better than I thought it would. I have just bought a new
Fod which has this feature, and is impressed by how well it works. I
have been wondering how they could set up the microphone and feedback
loop for this. But, alas, they cheat...

Both. My former Saab had (defeatable) speed-related volume
adjustment. My current Mercedes has both: a (defeatable) speed
adjustable volume adjustment and a (non-defeatable) compensation via a
microphone in the headliner. Awful stuff.

Kal

My '87 Honda Goldwing Aspencade (GL1200A) motorcycle uses speedo info to
control audio level and it usually works great. The speedo sensor once
got filled with water, though, and was only intermittently resporting
actual speed. I became aware of it because of the fluctuations in audio
level!

--
================================================== ======================
Michael Kesti | "And like, one and one don't make
| two, one and one make one."
| - The Who, Bargain

In article ,
Per Stromgren wrote:

Zipzit wrote on another subject:

"I know the auto industry uses actual vehicle speed input for radio
volume adjustment (I'm an Automotive Engineer… with close ties to
radio design folks.) "

They do? Can anybody confirm this? I have always wondered how they do
it, it works better than I thought it would. I have just bought a new
Fod which has this feature, and is impressed by how well it works. I
have been wondering how they could set up the microphone and feedback
loop for this. But, alas, they cheat...

Per.

Most cars have some kind of pulse signal that's relative in frequency to
the car's speed. It can be used for any of cruise control, speedometer
readout, transmission diagnostics, navigation systems, and the ECU.

I have a Blaupunkt HU with an input for such a signal. It's very good
for talk radio and background music. The downside is that the
compensation level that's perfect for low volume listening is way too
high for loud listening. What's loud when you're stopped becomes
suddenly painful when you speed up. I keep the compensation very low or
off to avoid that.

Per Stromgren wrote:

Zipzit wrote on another subject:
=20
"I know the auto industry uses actual vehicle speed input for radio
volume adjustment (I'm an Automotive Engineer=85 with close ties to
radio design folks.) "
=20
They do? Can anybody confirm this? I have always wondered how they do
it, it works better than I thought it would. I have just bought a new
Fod which has this feature, and is impressed by how well it works. I
have been wondering how they could set up the microphone and feedback
loop for this. But, alas, they cheat...=20

I have heard this in BMW's and Volkswagens. When I heard this in a BMW=20
a few years ago, it used quite large stepped increments that were simply =

speed related. If the internal noise level inside the car increased=20
(E.G. roll the window down at 60mph) then the radio volume was not adjust=
ed.

My VW Passat uses subtler increments, but they still seem to be simply=20
speed related.

Chris W

--=20
The voice of ignorance speaks loud and long,
but the words of the wise are quiet and few.
--

In , on 10/07/04
at 08:10 PM, Per Stromgren said:

Zipzit wrote on another subject:

"I know the auto industry uses actual vehicle speed input for radio
volume adjustment (I'm an Automotive Engineer with close ties to
radio design folks.) "

They do? Can anybody confirm this? I have always wondered how they do
it, it works better than I thought it would. I have just bought a new
Fod which has this feature, and is impressed by how well it works. I
have been wondering how they could set up the microphone and feedback
loop for this. But, alas, they cheat...

I'm not sure when this feature first appeared, but in early 60's the
feature was tied to the distributor (engine speed).

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