Rush gone from WRKO

[Dave Doherty]

I think the experience so far has been that every format performs
differently in the PPM markets than it did under the diary methodology. PPM
measures exposure, and I think the diaries probably measured affinity as
much as anything.

Rob, your idea about comparing PPM markets against diary markets is a good
one. It would be interesting to see whether that produces different data
than the pre- / post- PPM intra-market comparisons. Since each market is
different, it might be difficult to draw any conclusions, but it would be
interesting to try.

With PPM, it seems to be all about duty cycle in that 1-3 kHz range.
Maintain a high duty cycle, and you'll encode well.  Human speech is all
about content on that range, but the duty cycle of speech is low compared
with most music.  

You need to have consistent encoding to be reasonably assured that the PPM
device will decode the watermark. That's because the device has its own
challenges, oftentimes listening for that watermark in hostile noise
environments.  It may take a large number of samples over many seconds to
decode the watermark successfully, and if the watermark is coming and going
on the transmission, that adds to the challenge. If you don't get a solid
three minutes of decoding in a quarter-hour, you've lost the quarter-hour.

-d

-----Original Message-----
From: Rob Landry [mailto:011010001@interpring.com] 
Sent: Monday, May 25, 2015 8:38 AM
To: D. A.
Cc: Dave Doherty; 'Boston Radio Group'
Subject: RE: Rush gone from WRKO



On Thu, 21 May 2015, D. A. wrote:

> Here is more on the theory that is getting increase notice about the 
> 1-3 KHZ lack of PPM response.

> http://www.radioinsights.com/2015/05/everything-you-know-about-ppm-wro
> ng.html

Where's the evidence for any of these claims, though? Do talk formats
perform substantially differently in diary markets than in PPM markets? 
Given that there are plenty of both, it ought to be easy to find out.


Rob