Self-clocking system utilizing guaranteed bit transition

Claim 3

The system for providing digital signals to a channel of claim 1 further including: means for extending the time between transitions in said generated signal after said received data words.

Claim 4

The system of claim 1 further including: means for recovering the signal applied to said channel; means responsive to the interval between transitions in said recovered signal for providing a first output signal when said interval exceeds a predetermined portion of the period between bits in received data words, said predetermined portion being intermediate 50 percent and 100 percent of said period; means operative in response to the interval between transitions in said recovered signal for providing a second output signal whenever said interval is less than a further predetermined portion of the period between bits in received data words, said further predetermined portions being intermediate 50 percent and 100 percent of said period; and means for providing a digital output signal with a first level in response to said first output signal; and means for providing said digital output signal with a second level in response to said second output signal thereby to provide a reproduction of said received data words.

Claim 5

The system of claim 3 further including: means responsive to the interval between transitions in said recovered signal for providing a third signal in response to the interval between transitions exceeding the period between bits; and means responsive to said third signal for providing a separation in said digital output signal thereby to define framing for said data words.

Claim 6

A data system for providing self-clocking digital representatIons of data words to a data channel comprising: means for receiving said data words at a particular data pulse rate; means for generating a clock signal related to said data pulse rate; means responsive to said clock signal for providing a first timing signal having a predetermined phase relationship to said data pulse rate; means operating in response to said clock signal for providing a second timing signal substantially out of phase with said first timing signal; means operative to determine coincidence between said first timing signal and a first binary state in said received data words to provide a first gating signal; means for combining said first gating signal and said second timing signal to provide a second gating signal; means operative in response to said clock signal to provide frame signal pulses with an interval between pulses corresponding to the interval between data words; means for producing a binary signal having transitions responsive to pulses in said second gating signal; means operative in response to said frame signal pulses for inhibiting transitions in said binary signal for a predetermined interval greater than the period between pulses in said received data words and in synchronism with said frame signal pulses; and means for applying said binary signal to said data channel.

Claim 7

A data system for providing self-clocking digital representatIons of data words to a data channel comprising: means for receiving said data words at a particular data pulse rate; means for generating a clock signal related to said data pulse rate; means responsive to said clock signal for providing a first timing signal having a predetermined phase relationship to said data pulse rate; means operating in response to said clock signal for providing a second timing signal substantially out of phase with said first timing signal; means operative to determine coincidence between said first timing signal and a first binary state in said received data words to provide a first gating signal; means for combining said first gating signal and said second timing signal to provide a second gating signal; means operative in response to said clock signal to provide frame signal pulses with an interval between pulses corresponding to the interval between data words; means for producing a binary signal having transitions responsive to pulses in said second gating signal; means operative in response to said frame signal pulses for inhibiting transitions in said binary signal for a predetermined interval greater than the period between pulses in said received data words and in synchronism with said frame signal pulses; and means for applying said binary signal to said data channel.

Claim 8

The data system of claim 5 further including: means for recovering the signal applied to said data channel; means for detecting peak amplitudes in said recovered signal; means for generating a pulse in response to each detected amplitude peak; means for generating a first interval having a duration intermediate 50 percent and 100 percent of the shortest period between pulses in said received data words at said particular rate; means for producing a first control signal in response to generated pulses subsequent to the running of said first interval; means for triggering said first interval in response to said first control signal; means for producing a second control signal in response to generated pulses occurring during the running of said interval; and means for producing a binary output signal having a first level in response to said first control signal and a second level in response to said second control signal.

Claim 9

The data system of claim 6 further including: means for generating a medical analog signal representative of body processes; means operative in response to said frame signal pulses for generating a ramp signal in the interval between said frame signal pulses; means for comparing said medical signal and said ramp signal and operative to provide a compare signal representative of preset relationship in the levels of said two signals; means for counting at a predetermined rate substantially in excess of said data pulse rate in the interval between frame signal pulses and said compare signal; and means for forming said data words to represent the count of said counting means coincident with said compare signal.

Claim 10

The data system of claim 7 further including: means responsive to said generated pulse for producing a second interval having a duration greater than the period between pulses in said received data words; means for providing a third control signal in response to the interval between pulses in said generated pulses exceeding said second interval; a shift register operative to receive said binary output signal at the rate of said first control signal; and buffer register means operative to receive the contents of said shift register in response to said third control signal.

Claim 11

The data system of claim 8 further including: means operative in response to the signal in said buffer register for providing an analog output signal representative of the digital magnitude of said signal in said buffer register; and means for filtering said analog output signal to provide a reproduction Of said medical analog signal.

Claim 12

The data system of claim 9 wherein said channel is a magnetic disk recorder.

Claim 17

The system of claim 12 further including: means for generating a frame pulse to indicate intervals between data words in the serial data output of said shift register; and gating means responsive to said self-clocking pulse train and said frame pulse to block the application of said pulse train to the input of said bistable circuit coincident with said frame pulse for a duration greater than the interval between pulses in said clock pulse.