Abstract A pulse modulated infrared data communications link including a transmitter and receiver in which the data to be sent is encoded as a biphase modulated signal having bit-cell and mid-cell transitions. Each transition is encoded as a narrow pulse in a pulse modulated signal. The pulse modulated signal is used to activate an infrared optical transmitter for generating pulsed optical signals. At a receiver, an optical detector converts pulsed optical signals into pulsed electrical signals. The pulsed electrical signals are amplified and filtered and evaluated by a comparator to generate a pulsed digital signal. The pulsed digital signal is processed by a logic circuit to generate a biphase encoded signal for transmitting on a serial data line.
A method for communicating a biphase modulated signal having bit-cell and mid-cell transitions across an optical data link comprising: receiving said biphase modulated signal at a line receiver on a serial data line; encoding each bit-cell and mid-cell transition of said biphase modulated signal to a narrow unidirectional pulse of a pulse modulated signal; driving an optical transmitter with said pulse modulated signal to produce a pulsed optical signal; receiving said pulsed optical signal at an optical receiver; converting said received optical pulses to a pulsed electrical signal; decoding said pulsed electrical signal as a biphase modulated signal; and sending said biphase modulated signal on a serial data line by a line driver.
Claim 2
Independent Claim
113 words
A method for communicating a biphase modulated signal having bit-cell and mid-cell transitions across an optical data link comprising: receiving said biphase modulated signal at a line receiver on a serial data line; encoding each bit-cell and mid-cell transition of said biphase modulated signal to a narrow unidirectional pulse of a pulse modulated signal; driving an optical transmitter with said pulse modulated signal to produce a pulsed optical signal; receiving said pulsed optical signal at an optical receiver; converting said received optical pulses to a pulsed electrical signal; decoding said pulsed electrical signal as a biphase modulated signal; and sending said biphase modulated signal on a serial data line by a line driver.