Appeal No. 1998-0936
Application 08/369,011 Page 5
are simultaneously pulsed, and phase modulation is then used to
differentiate between the diodes at a receiver. The examiner's
position (answer, page 6) is that the IRLEDs are individually and
sequentially pulsed because each of the diodes "have been
drive[n] by a circuit (see figure 6) with their own drive
signals, which are +90", 0, -90" square waves."
Auerbach discloses (col. 3, lines 43-49) that “LEDs of the
handunit having respective fixed physical angular offsets from
the pointing axis of the remote control handunit are
simultaneously energized with respective signals having
corresponding fixed phase shifts from a 0" reference phase.”
Auerbach further discloses (figure 5 and col. 6, lines 28-52)
that IR transmission from the remote control is partitioned into
four principal intervals. Signals transmitted during the synch
and phase-reference interval synchronize the receiver with the
transmitter. In the Y-axis measurement interval, there is
simultaneous energization of LEDS 401-406. During the data
measurement interval, a signal representative of the output of an
array of pushbutton switches is transmitted simultaneously by all
of the LEDs using the same energizing signal. In the X-
measurement interval there is a simultaneous energization of LEDs
401-404, 407, and 408.
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