Appeal No. 1998-1105 Page 2
Application No. 08/300,599
are transmitted from the controllers to the appliances over
the power mains.
Unfortunately, the power mains are the sites of the two
types of electrical disturbances that can affect the
transmission quality of a message. First, recursive parasitic
pulses deform the bits that form the messages. Second,
variations in the line impedance of an installation attenuate
the amplitude of the entire message. Either type of
disturbance prevents a receiver from understanding the
messages.
The invention aims to improve the accuracy of messages
transmitted on a transmission line supplied by the mains
system. More specifically, the cause of an error (viz.,
parasitic pulses or line attenuation) is first determined.
Once the cause is known, subsequent messages can be sent at
different transmission rates and, if necessary, synchronously
with the frequency of the mains.
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 Next
Last modified: November 3, 2007