Appeal No. 2000-0519
Application 08/800,627
pulsed signal in Griffiths) to improve the radar detection
signal. However, both Hershey and Griffiths disclose a
conventional analog amplitude modulated television signal.
The Examiner finds that Hulyalkar teaches that multicarrier
modulation using multicarrier signals of the OFDM type is a
well known technique of transmitting television signals that
produces an encoded signal which has the advantages of
greater immunity to noise and interference (EA5; see
Hulyalkar, col. 2, lines 42-63). The Examiner concludes
that it would have been obvious to transmit the signals of
Hershey or Griffiths using an encoded multicarrier
television signal as taught by Hulyalkar for the reasons
noted in Hulyalkar (i.e., greater immunity to noise and
interference) (EA5).
The problem with the Examiner's reasoning, which is not
clearly addressed in the briefs, but which was brought out
at the oral hearing, is that merely transmitting the signals
of Hershey or Griffiths using OFDM as taught by Hulyalkar
does not produce an encoded waveform from a multicarrier
signal which acts as a radar signal. The repeated signals
in the analog waveform of Hershey or Griffiths would be
- 7 -
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 Next
Last modified: November 3, 2007