On 9/27/12 2:58 PM, Bob Camp wrote:
Hi
It would be interesting to hear what the patent lawyers on the list think about
the patents. Given a quick read, they appear to cover any use of the specific
transmitted format for receiving time information.
IANAL, but..
reading Claim 1..
a key aspects are the combination of PSK and ASK, with different data.
This is somewhat unusual, and may not have been done exactly like that.
"said phase modulation *is independent* of the information represented
by said pulse width modulation/amplitude shift keyed modulation" is a
phrase that occurs in ALL of the independent claims.
(my emphasis added)
QAM is, of course, simultaneous PSK and ASK, but it's a single data
stream that is being encoded.
Is there prior art for transmitting one kind of data using ASK and
something else PSK?
For instance, is WWV (which is primarily ASK) has a subcarrier, but the
subcarrier is also AM.
Another possible source of prior art might be a PSK encoded digital
squelch on a AM or FM modulated signal (if such a system exists).
Bob
On Sep 27, 2012, at 2:54 PM, Scott Newell <[email protected]> wrote:
Looks like one has issued (8,270,465). Application 20120082008 appears to be
relevant as well.
http://www.google.com/patents/US8270465
http://www.google.com/patents/US20120082008
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