Digital apparatus for synchronizing a stream of data bits to an internal clock

Claim 1

An apparatus for clocking coded electronic data pulses from an external device, the data pulses including logic ZEROs and logic ONEs wherein a logic ZERO is represented by an electronic pulse and the logic ONE by an absence of an electronic pulse and the apparatus generating clock signals normally including a predetermined plurality of time intervals of predetermined duration established by signals defining the time intervals, said apparatus including means for synchronizing the clock signals with the data pulses comprising: first means for receiving the signals defining the time intervals and for generating clock pulses therefrom, each clock pulse including a plurality of time intervals; second means for receiving the data pulses from said external device and for generating a first signal indicative of a logic ZERO data pulse received from the external device; third means coupled to said first means and said second means for synchronizing the clock pulses with the data pulses; and fourth means coupled to said first means, said second means and said third means and controlling the first means for varying the duration of a clock pulse from the first means by varying the time invervals in the clock pulse when the time interval in which a first signal indicative of the data pulse received from said external device varies from a predetermined time interval of the clock pulses.

Claim 2

An apparatus for clocking coded electronic data pulses from an external device, the data pulses including logic ZEROs and logic ONEs wherein a logic ZERO is represented by an electronic pulse and the logic ONE by an absence of an electronic pulse and the apparatus generating clock signals normally including a predetermined plurality of time intervals of predetermined duration established by signals defining the time intervals, said apparatus including means for synchronizing the clock signals with the data pulses comprising: first means for receiving the signals defining the time intervals and for generating clock pulses therefrom, each clock pulse including a plurality of time intervals; second means for receiving the data pulses from said external device and for generating a first signal indicative of a logic ZERO data pulse received from the external device; third means coupled to said first means and said second means for synchronizing the clock pulses with the data pulses; and fourth means coupled to said first means, said second means and said third means and controlling the first means for varying the duration of a clock pulse from the first means by varying the time invervals in the clock pulse when the time interval in which a first signal indicative of the data pulse received from said external device varies from a predetermined time interval of the clock pulses.