GB1362206A - Apparatus for synthesising polyphase sine waves - Google Patents
Apparatus for synthesising polyphase sine wavesInfo
- Publication number
- GB1362206A GB1362206A GB351771A GB351771A GB1362206A GB 1362206 A GB1362206 A GB 1362206A GB 351771 A GB351771 A GB 351771A GB 351771 A GB351771 A GB 351771A GB 1362206 A GB1362206 A GB 1362206A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oscillations
- frequency
- sinusoidal
- cancelling
- harmonic
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B28/00—Generation of oscillations by methods not covered by groups H03B5/00 - H03B27/00, including modification of the waveform to produce sinusoidal oscillations
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06G—ANALOGUE COMPUTERS
- G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
- G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
- G06G7/22—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating trigonometric functions; for conversion of co-ordinates; for computations involving vector quantities
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Analysis (AREA)
- Algebra (AREA)
- Mathematical Optimization (AREA)
- Power Engineering (AREA)
- Pure & Applied Mathematics (AREA)
- Software Systems (AREA)
- Computer Hardware Design (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
1362206 Waveform changing G & E BRADLEY Ltd 28 Jan 1972 [29 Jan 1971] 3517/71 Addition to 1206941 Heading H2F In apparatus for synthesizing polyphase sine waves, a non-sinusoidal (e.g. square wave) source 10 feeds a chain of frequency dividers 11 ... 16 which provide a primary non-sinusoidal oscillation of frequency f and further first phase oscillations of multiple frequency 3f, 5f &c., the components of the Fourier series of the further oscillations having the same relationship to one another as those of the primary oscillation f; the frequencies and phases of the further oscillations being such that when combined at 18, with the primary oscillation f, cancellation of the significant harmonics takes place so that the resultant output is sinusoidal. The dividing chain includes a stage 15 which divides by n (where n is equal to the required number of phases) and has n outputs which are fed to further combining means (not shown) together with appropriate further harmonic-cancelling oscillations so as to provide sinusoidal outputs at the other phases. Fig. 1 shows part of a system for providing a three-phase output. A square wave source 10 of frequency 30,030 f is fed to the dividing chain 11 ... 16, having the division ratios shown, to provide a square wave at the fundamental frequency f. Further dividers provide the harmonic-cancelling square waves 3f ... 15f, which are fed to a summing circuit 18 comprising weighted resistors 17, 23 ... 28. The first phase output is obtained from an amplifier 19 via an optional filter 20. Dividers 15, 30 ... 33 have a ratio of 3 and provide outputs displaced by 120 degrees so as to supply fundamental and harmonic-cancelling oscillations to further summing circuits (Figs. 2 and 3, not shown).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB351771A GB1362206A (en) | 1972-01-28 | 1972-01-28 | Apparatus for synthesising polyphase sine waves |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB351771A GB1362206A (en) | 1972-01-28 | 1972-01-28 | Apparatus for synthesising polyphase sine waves |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1362206A true GB1362206A (en) | 1974-07-30 |
Family
ID=9759820
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB351771A Expired GB1362206A (en) | 1972-01-28 | 1972-01-28 | Apparatus for synthesising polyphase sine waves |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1362206A (en) |
-
1972
- 1972-01-28 GB GB351771A patent/GB1362206A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1514565A (en) | Atomic beam apparatus | |
GB1206941A (en) | Apparatus for synthesising sine waves | |
US3660766A (en) | Sinusoidal waveform generator | |
GB654979A (en) | Improvements in or relating to apparatus for producing electric waveforms for use inadjustable delay- or time-measuring systems | |
US2553610A (en) | Harmonic amplitude selector for signaling systems | |
GB1362206A (en) | Apparatus for synthesising polyphase sine waves | |
US3529260A (en) | Oscillator with frequency dividers for providing tunable sinusoidal outputs | |
ES426500A1 (en) | Frequency synthesizer having phase-locked loop including sample and hold circuit frequency converter | |
GB762935A (en) | Frequency conversion circuits | |
GB1026654A (en) | Signal generator | |
JPS5271966A (en) | Triangular wave generator | |
GB1404468A (en) | Circuit arrangement for generating two amplitude-stabilised sinusoidal signals which are 90 o out of phase relative to one another | |
GB662922A (en) | Improvements in or relating to multiplex carrier-frequency electrical signal transmission systems | |
US3826995A (en) | Frequency generators | |
GB583246A (en) | Improvements in or relating to electrical arrangements for selecting individual components of a complex wave | |
GB1106456A (en) | Improvements relating to frequency synthesis | |
GB1077744A (en) | Method of and apparatus for generating a complex waveform | |
GB719780A (en) | Improvements in or relating to oscillation generators | |
GB714684A (en) | Improvements in devices for frequency selections | |
JPS5333037A (en) | Three-phase sine wave generating equipment | |
US2688730A (en) | Stable frequency generator system | |
SU485536A1 (en) | Frequency divider | |
GB1304852A (en) | ||
GB780152A (en) | Improvements in or relating to carrier wave generators | |
JPS5333038A (en) | Phase synchronizing oscillator |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |