Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-12-11
1999-03-30
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359184, 359185, 359142, 359161, H04B 1004, H04B 1010
Patent
active
058896040
ABSTRACT:
Data communications are carried out between portable information terminals through infrared radiation with an energy source which may be either a battery in each of the portable information terminals or an external power supply therefor, at a data transmission rate which is relatively low when the portable information terminal is operated by the battery. If the power source is the incased battery, the data transmission rate is switched to a low rate, data to be transmitted are compressed, and the respective numbers of bits "0" and "1" contained in the compressed data are compared with each other. If the number of bits which require a greater amount of electric energy for transmission is greater than the other number of bits, then the value of bits is inverted. Data indicative of the low data transmission rate, the compression of the data, and whether the value of bits has been inverted or not are coded into header data which are added to the compressed data for transmission. The data transmission rate is adjusted, the compressed data are expanded, and the inverted value of bits is inverted back by a controller in response to the header data at the receiver side.
REFERENCES:
patent: 5075792 (1991-12-01), Brown et al.
NEC Corporation
Pascal Leslie
LandOfFree
Method of and apparatus for data communications between portable does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of and apparatus for data communications between portable, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and apparatus for data communications between portable will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1219660