Gating circuit for displaced pulses

Claim 2

A gating circuit for selecting input timing pulses from an input signal which includes a train of such pulses comprising: an input gate for receiving the input signal; enabling means connected to enable the input gate to sample the input signal during periods each timed to include one of the input timing pulses; and a sawtooth signal generator connected to receive the sampled signals from the input gate, each of the input timing pulses passed by the input gate being effective to trigger a flyback of the sawtooth signal, the sawtooth signal waveform having a fixed flyback magnitude and having ramp portions of substantially the same slope between flyback intervals, the enabling means being responsive to the sawtooth signal to enable the input gate whenever the sawtooth signal is above a controlled level along a ramp portion.

Claim 3

A gating circuit according to claim 1, wherein the sawtooth generator has a control means which control the slopes of the ramp portions to compensate for Variation in the sawtooth signal waveform.

Claim 4

A gating circuit as in claim 1, including means for determining the controlled level and for proportioning the sawtooth waveform to provide preselected portions of the sawtooth waveform above and below the controlled level.

Claim 5

A gating circuit according to claim 3, wherein said determining and proportioning means comprise a capacitor having one electrode connected to receive the sawtooth signal, and the other electrode connected to receive a charging current through a rectifying circuit biased for cutoff whenever the other electrode of said capacitor rises to a preselected potential in response to the sawtooth signal.

Claim 6

A gating circuit for selecting input timing pulses from an input signal which includes a train of such pulses comprising: an input gate for receiving the input signal; enabling means connected to enable the input gate to sample the input signal during periods each timed to include one of the input timing pulses; a sawtooth signal generator connected to receive the sampled signals from the input gate, each of the input timing pulses passed by the input gate being effective to tripper a flyback of the sawtooth signal, the sawtooth signal waveform having a fixed flyback magnitude and having ramp portions of substantially the same slope between flyback intervals, the enabling means being responsive to the sawtooth signal to enable the input gate whenever the sawtooth signal is above a controlled level along a ramp portion, wherein the sawtooth generator comprises a pair of capacitors, a first of which transfers charge to the second in response to each input timing pulse, each flyback of the sawtooth waveform being derived from such a transfer of charge.

Claim 7

A gating circuit for selecting input timing pulses from an input signal which includes a train of such pulses comprising: an input gate for receiving the input signal; enabling means connected to enable the input gate to sample the input signal during periods each timed to include one of the input timing pulses; a sawtooth signal generator connected to receive the sampled signals from the input gate, each of the input timing pulses passed by the input gate being effective to tripper a flyback of the sawtooth signal, the sawtooth signal waveform having a fixed flyback magnitude and having ramp portions of substantially the same slope between flyback intervals, the enabling means being responsive to the sawtooth signal to enable the input gate whenever the sawtooth signal is above a controlled level along a ramp portion, wherein the sawtooth generator comprises a pair of capacitors, a first of which transfers charge to the second in response to each input timing pulse, each flyback of the sawtooth waveform being derived from such a transfer of charge.

Claim 8

A gating circuit according to claim 5, wherein a junction between the pair of capacitors is maintained at a substantially uniform potential during each transfer of charge.

Claim 9

A gating circuit according to claim 6, wherein the second of the capacitors is connected between the base and collector electrodes of a transistor to constitute a Miller integrator, the junction between the pair of capacitors being connected in common with the base electrode of the transistor.

Claim 10

A gating circuit according to claim 6, wherein the control circuit comprises a filter coupled to the sawtooth generator, the junction between the capacitors being connected to a supply circuit which supplies current thereto under the control of the filter.

Claim 11

A magnetic store comprising: a magnetic medium for storing recorded information having two groups of interspersed pulses, one group of pulses representing intelligent data, the second group representing timing data; means for reading out the recorded information from said medium for obtaining a signal including a train of pulses of said one group; and a gating circuit for gating the intelligent data pulses to an output circuit, said gating circuit comprising means for generating a sawtooth signal having a constant proportion between each signal portion below a controlled threshold and the signal portion of the same cycle above such threshold for every cycle of oscillation.

Claim 12

A magnetic store comprising: a magnetic medium for storing recorded information having two groups of interspersed pulses, one group of pulses representing intelligent data, the second group representing timing data; means for reading out the recorded information from said medium for obtaining a signal including a train of pulses of said one group; and a gating circuit for gating the intelligent data pulses to an output circuit, said gating circuit comprising means for generating a sawtooth signal having a constant proportion between each signal portion below a controlled threshold and the signal portion of the same cycle above such threshold for every cycle of oscillation.

Claim 13

A magnetic store according to claim 9, wherein the data is recorded in the form of a phase modulated oscillation.