to shift the phase, to place or to generate (orthognonal) signals in quadrature
Explanation:
I deleted redundant links and modified my proposal to bear Tony's comments into consideration:
The phrase « Un dispositif de rétroaction altère, …, la phase du second signal d'entrée afin de mettre en quadrature les premier et second signaux de sortie »
can be translated by « A feedback device alter … the phase of the second entry signal in order
to shift the phase between the first and second output signal by 90 ,
to place the first and second output signal in quadrature,
to generate output signals in quadrature, or
to generate orthogonal output signals.
All these alternate expressions are identical and may be supported by the following references:
A mixer (52) receives the output signals (38, 46) and compares the signal phase to produce a signal (54) indicative of the change in phase. A feedback arrangement (56, 58) alters the phase of the second input signal (26) based on the mixer signal (54) to place the first and second output signals (38, 46) in quadrature.
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Un arrangement de contre-réaction (56, 58) altère, sur la base du signal de mélangeur (54), la phase du second signal d'entrée (26) afin de mettre en quadrature les premier et second signaux de sortie (38, 46).
http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/patent/235...
This disclosure deals with processing radio-frequency navigation signals, particularly Loran-C signals, from crossed loop antennas (H-field antennas) by shifting the signal phase from two loops to be in quadrature with respect to each other
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L'invention porte sur un procédé de traitement de signaux H.F. de navigation, notamment du type Loran-C, captés par des antennes à cadres croisés (antennes à champ en H) consistant: à décaler le signal de phase des deux cadres pour les mettre en quadrature l'un par rapport à l'autre;
http://www.google.com/patents/EP0939904A1?cl=fr
En physique ou électronique, deux signaux sinusoïdaux de même période sont en quadrature s'ils sont en déphasage de π/2).
http://fr.wikipedia.org/wiki/Quadrature
• Quadrature amplitude modulation (QAM), a modulation method of using both an (in-phase) carrier wave and a 'quadrature' carrier wave that is 90° out of phase with the main, or in-phase, carrier
• Quadrature phase, oscillations that are said to be in quadrature if they are separated in phase by 90° (π/2, or λ/4)
http://en.wikipedia.org/wiki/Quadrature
In electrical engineering, a sinusoid with angle modulation can be decomposed into, or synthesized from, two amplitude-modulated sinusoids that are offset in phase by one-quarter cycle (π/2 radians). All three functions have the same frequency. The amplitude modulated sinusoids are known as in-phase and quadrature components.[1] Some authors find it more convenient to refer to only the amplitude modulation (baseband) itself by those terms.
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And when φ happens to be such that the in-phase component is zero, the current and voltage sinusoids are said to be in quadrature, which means they are orthogonal to each other. In that case, no electrical power is consumed. Rather it is temporarily stored by the device and given back, once every 1/f seconds. Note that the term in quadrature only implies that two sinusoids are orthogonal, not that they are components of another sinusoid.
http://en.wikipedia.org/wiki/Quadrature_phase
Quadrature amplitude modulation (QAM) is both an analog and a digital modulation scheme. It conveys two analog message signals, or two digital bit streams, by changing (modulating) the amplitudes of two carrier waves, using the amplitude-shift keying (ASK) digital modulation scheme or amplitude modulation (AM) analog modulation scheme. The two carrier waves, usually sinusoids, are out of phase with each other by 90° and are thus called quadrature carriers or quadrature components — hence the name of the scheme. The modulated waves are summed, and the resulting waveform is a combination of both phase-shift keying (PSK) and amplitude-shift keying (ASK), or (in the analog case) of phase modulation (PM) and amplitude modulation. In the digital QAM case, a finite number of at least two phases and at least two amplitudes are used.
http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation
Note that due to the projection onto the P quadrature, the effective signal amplitudes in the homodyne detection are reduced by a factor of 1/√2. Supposing that the measurement yielded the correct hypothesis, the next task is to discriminate between |t•α1〉and |t•α2〉via the K or the OD receiver. For simplicity, let us first consider the K receiver.
The signal is displaced such that one of the remaining candidate states is shifted to the vacuum state|0〉, while the other state gets amplified to an amplitude of |√2t•α|.
http://iopscience.iop.org/1367-2630/14/8/083009/pdf/1367-263...
2. The receiver of claim 1, wherein said QPSK decomposition filter is configured to select between a first phase shifted signal and a second phase shifted signal to generate said first BPSK signal and said second BPSK signal.
:
24. The QPSK interlacing filter of claim 19 further comprising a third phase shifter configured to a second phase of first BPSK signal and a fourth phase shifter configured to shift a third phase of said second BPSK signal
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[0004] Phase shift keying ("PSK"), specifically binary phase shift keying ("BPSK") and quadrature phase shift keying ("QPSK"), is a widely used digital modulation scheme in wireless systems such as IEEE 802.15.4, global positioning system ("GPS"), IEEE 802.11 ("WiFi") systems and medical telemetry. This technique represents digital bits by shifting the phase of the carrier signals. Under similar bandwidth occupation, PSK signals are more robust to noise as compared to amplitude shift keying ("ASK") or frequency shift keying ("FSK") modulation schemes.
[0058] According to the embodiment illustrated in FIG. 8, a power divider 704 is coupled with a positive phase shifter 708 and negative phase shifter 710. For an embodiment, a positive phase shifter 708 is configured to shift a phase of a signal by a positive forty-five degrees ("+45°"). A negative phase shifter 710, according to an embodiment, is configured to shift a phase of a signal by a negative forty-five degrees ("-45°"). A phase shifter may be implemented as a PIN-diode phase shifter, a loaded-line phase shifter, a reflection-type phase shifter, or another circuit for changing a phase of a signal. As illustrated in FIG. 8, an embodiment includes a positive phase shifter 708 coupled with a mixer 712 and a first switch 714. A negative phase shifter 710, according to an embodiment, is coupled to a mixer 712 and a second switch 716. A mixer 712 is configured to receive a first phase shifted signal 718 from a positive phase shifter 708 and a second phase shifted signal 720 from a negative phase shifter 710. A mixer 712 may be implemented using techniques including those described herein.
http://www.faqs.org/patents/app/20130195224
And this is Fig. 8:
http://www.faqs.org/patents/imgfull/20130195224_08
Modern communication systems use In-Phase (I) and Quadrature (Q) signals for modulation and demodulation. This requires accurate local oscillator (LO) outputs.
:
I. QUADRATURE SIGNAL GENERATION BASICS
Traditionally, the I–Q outputs are generated either by using a RC-CR phase shifter together with power-consuming phase correction circuits [5], or by running the LO at twice the desired frequency (or employing a frequency doubler) and using the I–Q outputs of a flip-flop frequency divider.
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A simple example of quadrature technique is to shift signal phases by ± 45° by using RC-CR
network (Fig. 1).
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Havens’ technique first splits the signal by approximately 90°, generating V1 and V2, and subsequently adds and subtracts these two phases, producing V1out and V 2out [10] as shown in Fig. 3(a).
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There is another approach to generating quadrature signals by using frequency ω1. The circuit is to use a master-slave flipflop to divide a signal at ω1 by a factor of 2, seen in Fig. 5.
http://www.eecg.toronto.edu/~kphang/papers/2001/dong_IQphase...
Because the time-shift is different for each frequency, it is not trivial to shift a compound signal by a fixed arc length.
http://www.katjaas.nl/hilbert/hilbert.html
The amplitude and phase really begin to change one decade below this point, at 0.1 ×ω3dB, and the phase continues to shift until it reaches 90°at 10 ωdB, one decade beyond the 3-dB point.
https://www.calvin.edu/~pribeiro/courses/engr332/Handouts/os...
Still some definitions of terms:
Area Mathematics - Functions / Sinusoidal quantities
IEV ref 103-07-10
en in quadrature
fr en quadrature
http://www.electropedia.org/iev/iev.nsf/display?openform&iev...
(Note: the definitions can not be copied).
Area Oscillations, signals and related devices / Signals; General terms
IEV ref 702-04-53
en quadrature signal
harmonic conjugate signal
the imaginary part g(t) of an analytic signal
Note – The name "quadrature signal" is justified by the fact that, apart from sign changes, sin ωt and cos ωt are Hilbert transforms of each other and that consequently the analytic signal corresponding to the real signal cos ωt is:
eiσ ωt
fr signal en quadrature
partie imaginaire g(t) d'un signal analytique
Note – La dénomination du "signal en quadrature" est justifiée par le fait que sin ωt et cos ωt sont au signe près les transformées de Hilbert l'un de l'autre et que par conséquent le signal analytique représentant le signal réel cos ωt est: eiσ ωt
http://www.electropedia.org/iev/iev.nsf/display?openform&iev...
Area Oscillations, signals and related devices / Modulation and demodulation
IEV ref 702-06-39
en phase shift
in angle modulation by a discretely timed signal the difference between the phases of two signal elements of the modulated signal, assuming steady state conditions
fr déplacement de phase
en modulation angulaire par un signal temporel discret, différence entre les phases de deux éléments de signal du modulat, en supposant les régimes établis
http://www.electropedia.org/iev/iev.nsf/display?openform&iev...
Area Oscillations, signals and related devices / Modulation and demodulation
IEV ref 702-06-40
en phase shift keying
PSK (abbreviation)
phase shift modulation
phase shift signalling
angle modulation in which each significant condition in a discretely timed modulating signal is represented by a specified difference between the phase of the modulated signal and the phase of the carrier in the absence of modulation
fr modulation par déplacement de phase
MDP (abréviation)
modulation angulaire dans laquelle chaque état significatif d'un signal temporel discret modulant est représenté par une valeur déterminée de la différence entre la phase du modulat et la phase qu'aurait la porteuse en l'absence de modulation
http://www.electropedia.org/iev/iev.nsf/display?openform&iev...
| Johannes Gleim
Local time: 03:37
Specializes in field
Native speaker of: German
PRO pts in category: 165
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peer agreement (net): +3