초록 ▼

A method for printing a document from a computer including transmitting instructions for printing the document from the computer to a printer, printing the document on the printer in accordance with the instructions received from the computer, and also printing on the document coded data indicative

A method for printing a document from a computer including transmitting instructions for printing the document from the computer to a printer, printing the document on the printer in accordance with the instructions received from the computer, and also printing on the document coded data indicative of an identity of the document and a plurality of reference points on the document, wherein the coded data is printed on the document in a form which can be read by an optical sensing device to identify a location of the sensing device relative to the document thereby to invoke a function in relation to the document.

대표청구항 ▼

A method for printing a document from a computer including transmitting instructions for printing the document from the computer to a printer, printing the document on the printer in accordance with the instructions received from the computer, and also printing on the document coded data indicative

A method for printing a document from a computer including transmitting instructions for printing the document from the computer to a printer, printing the document on the printer in accordance with the instructions received from the computer, and also printing on the document coded data indicative of an identity of the document and a plurality of reference points on the document, wherein the coded data is printed on the document in a form which can be read by an optical sensing device to identify a location of the sensing device relative to the document thereby to invoke a function in relation to the document. ltage and coupled to said capacitor, said comparator providing an output signal having two binary states, said output signal transitioning between said binary states when a voltage on said capacitor exceeds said reference voltage.3. A differential signal detection circuit as in claim 1, wherein said detection circuit comprises first and second transistors each having a source terminal and a drain terminal being coupled respectively to a terminal of said capacitor and a predetermined voltage, and a gate terminal coupled to one of said component signals of said differential signal.4. A differential signal detection circuit as in claim 2, wherein said reference voltage is generated by tapping a string of resistors.5. A differential signal detection circuit as in claim 4, wherein a second reference voltage is generated from said string of resistors, said reference voltage being selected by activating one of a plurality of switches.6. A differential signal detection circuit as in claim 5, wherein said switches are software programmable.7. A method for detecting a differential signal, comprising: receiving a differential signal comprising a first component signal and a second component signal;receiving a threshold voltage; andcharging a capacitor when one of said component signals of said signal has an amplitude exceeding said threshold voltage by a predetermined amount.8. A method for detecting said differential signal as in claim 7, further comprising receiving a reference voltage and receiving a voltage of said capacitor; and providing an output signal having two binary states, said output signal transitioning between said binary states when said voltage on said capacitor exceeds said reference voltage.9. A method for detecting a differential signal as in claim 7, further comprising providing first and second transistors each having a source terminal and a drain terminal being coupled respectively to a terminal of said capacitor and a predetermined voltage, and a gate terminal coupled to one of said component signals of said differential signal.10. A method for detecting a differential signal as in claim 8, further comprising generating said reference voltage by tapping a string of resistors.11. A method for detecting a differential signal as in claim 10, further comprising generating a second reference voltage from said string of resistors, said reference voltage being selected by activating one of a plurality of switches.12. A method for detecting a differential signal as in claim 11, further comprising programming said switches by software. to the amplified signal in the amplifier and detects the distortion component reduced by the filter. The distortion removal loop removes from the amplified signal the detected distortion component that was produced by the amplifier and reduced by the filter.