Herbert Graf wrote:
>> > Does anyone know whether the track still exists? I live in Phoenix
>> > and never heard of it, but it's just way too cool!
>>
>> This is the first I heard of Goodyear doing this in Phoenix.  Much more
>> recently a Japanese car company (Toyota?) cut grooves in a road in
>> Kentucky(?) such that it played a tune.  I've seen a video of that one,=
=20
>> but
>> never of one with a voice recording.
>
> Cool, the tune ones are called "melody roads":
>
> http://www.guardian.co.uk/world/2007/nov/13/japan.gadgets
>
> http://www.youtube.com/watch?v=3DyTsoP3WWgU4
>

This technique is different from the one described in the original post. Th=
e=20
Japanese cut the grooves perpendicular to the line of travel, and the=20
spacing b/w the grooves is what creates the different notes. There is no wa=
y=20
to encode amplitude, only pitch.

If the "talking track" really existed, it makes sense that they used groove=
s=20
parallel to the direction of travel: you can encode both the pitch and the=
=20
amplitude.

This reminds me of the difference between a regular microphone and a "pin"=
=20
microphone, which is suitable for transmitting music but not voice.

Vitaliy=20

--=20
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