GB857232A - Electronic circuit providing an indication of the occurrence of predetermined values and changes in values of input signals - Google Patents
Electronic circuit providing an indication of the occurrence of predetermined values and changes in values of input signalsInfo
- Publication number
- GB857232A GB857232A GB20846/58A GB2084658A GB857232A GB 857232 A GB857232 A GB 857232A GB 20846/58 A GB20846/58 A GB 20846/58A GB 2084658 A GB2084658 A GB 2084658A GB 857232 A GB857232 A GB 857232A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- flip
- flop
- changes
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D3/00—Control of position or direction
- G05D3/12—Control of position or direction using feedback
- G05D3/20—Control of position or direction using feedback using a digital comparing device
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/26—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being duration, interval, position, frequency, or sequence
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/08—Continuously compensating for, or preventing, undesired influence of physical parameters of noise
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Nonlinear Science (AREA)
- Theoretical Computer Science (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
857,232. Electric direction detection. NORTH AMERICAN AVIATION Inc. June 30, 1958, No. 20846/58. Class 40 (1). A circuit adapted to receive two or more binary signals has means for detecting changes in a signal from either value to the other, and further means producing an output on one terminal when certain changes in one signal coincide with certain values of the other or vice versa, and on another terminal when other signal changes coincide with other signal values. The invention is described as applied to apparatus for detecting the direction of movement of a magnetic tape 1, Fig. 1, a track 2 of which co-operates with reading heads 3, 4 spaced apart by an odd number of quarter wavelengths. The outputs from the heads, Fig. 2, are applied to flip-flops 5, 6 and converted thereby into square waves, Fig. 3. The circuit 7 determines the direction of motion of the heads relative to the track 2, motion to the right producing changes of signal such as occur when moving to the right in Fig. 3 and motion to the left producing changes encountered by moving to the left in Fig. 3. The signal values are termed α and α<SP>1</SP> for flip-flop 5 and # and (31 for flip-flop 6, α and # being zero and α<SP>1</SP> and #<SP>1</SP> being -10 volts. The changes of signal value are likewise termed a and b for a downward change and a<SP>1</SP> and b<SP>1</SP> for an upward change. Movement to the right produces an upward change b<SP>1</SP> when the other signal is at α, a downward change a when the other signal is at #, a downward change b when the other signal is at α<SP>1</SP> and an upward change a<SP>1</SP> when the other signal is at #<SP>1</SP>. Movement to the left produces a succession of different combinations and the two successions are detected by the circuit of Fig. 4. Transistor 11 inverts the output from flip-flop 5 and transistor 15 inverts that from flip-flop 6. Line 12 is high when α exists, line 13 when α<SP>1</SP> exists. Line 16 is high when # exists and line 17 when #<SP>1</SP> exists. A change a is detected by condenser 18 and resistor 19 and a corresponding signal a is produced. Similar differentiating circuits 20, 21; 22, 23 and 24, 25 produce signals b, a<SP>1</SP> and b<SP>1</SP>. The signal #<SP>1</SP> when present prevents a negative a signal from passing through diode 27. When # is present the a signal passes to provide a a# signal signifying that the flip-flop 5 has changed downwardly while flip-flop 6 is at the upper value. By similar gating arrangements signals α<SP>1</SP>b, a<SP>1</SP>#<SP>1</SP> and αb<SP>1</SP> are also extracted when present and applied through a transistor 28 to a terminal 29 and thence to the " add " input of counter 8. These combinations occur only during movement to the right and the pulses appearing at terminal 29 are passed to counter 8, Fig. 1, to count positively (say). Other combinations a#<SP>1</SP>, αb, a<SP>1</SP># and α<SP>1</SP>b<SP>1</SP> are produced by similar diode gating circuits and pass corresponding signals to terminal 38. Since these are the combinations appearing during leftward movement, the pulses are passed to the " subtract " input of the counter 8. In a modification, the inverters 11 and 15 are omitted, the flip-flops being arranged to have two complementary outputs representing respectively α and α<SP>1</SP>, # and #<SP>1</SP>. These outputs are differentiated and diode-gated as before. In another modification transistorized flip-flops 5 and 6 are described, each having complementary output leads, the signals on which are differentiated and gated with the values on other leads to produce outputs to " right " and " left " terminals as before. These outputs are combined and amplified in four transistor stages to produce pulses on a single terminal for application to the counter. The signals on the left and right terminals are used to set or re-set a transistor flip-flop, the outputs from which indicate to the counter whether the amplified pulses are to be added or subtracted. In an alternative arrangement three reading heads are used, producing signals phase-displaced by 60 degrees so that instead of four combinations appearing for right- or left-hand movement, there are six such combinations. These are detected as described above, a greater resolution being obtained by using three heads than by two. Any other number of heads may be used.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US569209A US2926335A (en) | 1956-03-02 | 1956-03-02 | Electronic direction circuit |
GB20846/58A GB857232A (en) | 1958-06-30 | 1958-06-30 | Electronic circuit providing an indication of the occurrence of predetermined values and changes in values of input signals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB20846/58A GB857232A (en) | 1958-06-30 | 1958-06-30 | Electronic circuit providing an indication of the occurrence of predetermined values and changes in values of input signals |
Publications (1)
Publication Number | Publication Date |
---|---|
GB857232A true GB857232A (en) | 1960-12-29 |
Family
ID=10152711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20846/58A Expired GB857232A (en) | 1956-03-02 | 1958-06-30 | Electronic circuit providing an indication of the occurrence of predetermined values and changes in values of input signals |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB857232A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3210567A (en) * | 1962-04-05 | 1965-10-05 | Burroughs Corp | Reversible electronic counter |
-
1958
- 1958-06-30 GB GB20846/58A patent/GB857232A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3210567A (en) * | 1962-04-05 | 1965-10-05 | Burroughs Corp | Reversible electronic counter |
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