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Gated Variable Frequency Oscillator

IP.com Disclosure Number: IPCOM000096936D
Original Publication Date: 1962-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Prentky, PI: AUTHOR [+2]

Abstract

The circuit causes oscillator 11 to respond quickly to synchronizing pulses on input line 38. Positive lock-in is provided with such pulses. The state of oscillator 11 is dependent on the D.C. level of flip-flop 32. Flip-flop 32 is controlled by a START signal on input line 34 and by the output of AND 36. Start line 34 also connects to the reset side of 32. The potential on line 40 is high when 32 is in reset state. The first tape signal arriving on line 38, while there is a start signal on start line 34, passes through the AND 36 and sets flip-flop 32. The potential on the line 40 drops and oscillator 11 starts.

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Gated Variable Frequency Oscillator

The circuit causes oscillator 11 to respond quickly to synchronizing pulses on input line 38. Positive lock-in is provided with such pulses. The state of oscillator 11 is dependent on the D.C. level of flip-flop 32.

Flip-flop 32 is controlled by a START signal on input line 34 and by the output of AND 36. Start line 34 also connects to the reset side of 32. The potential on line 40 is high when 32 is in reset state.

The first tape signal arriving on line 38, while there is a start signal on start line 34, passes through the AND 36 and sets flip-flop
32. The potential on the line 40 drops and oscillator 11 starts.

The AND 36 becomes conditioned such that no subsequent signal passes it. Simultaneously, the high potential produced at the right output of flip-flop 32 passes through line 46, delay circuit 48 and conductor 50. This conditions AND 52 to pass the tape signals delivered by way of line 54. Tape signals on conductor 56 are fed to complementary pulser 58. This produces output signals on lines 60 and 62, which are combined with a saw-tooth wave. The latter are supplied through conductor 24 to form a signal for controlling the frequency of oscillator 11.

The saw-tooth wave on line 24 is derived by transforming in circuit 14 the oscillations of oscillator 11 into pulses. These pulses, aided by saw-tooth generator 18, are transformed into a saw-tooth wave. In the bidirectional memory 28, the arrival of the tape pulses is compa...